X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/5de76427c87d8289f5c343cef16e9375056fc49f..4179da8a81ee3110e2a8b5615e1a4f8c8b75a16b:/docs/latex/wx/wxstring.tex?ds=sidebyside diff --git a/docs/latex/wx/wxstring.tex b/docs/latex/wx/wxstring.tex index 5d1d728a2e..4d7fa2a23a 100644 --- a/docs/latex/wx/wxstring.tex +++ b/docs/latex/wx/wxstring.tex @@ -1,20 +1,406 @@ \section{\class{wxString}}\label{wxstring} +wxString is a class representing a character string. Please see the +\helpref{wxString overview}{wxstringoverview} for more information about it. As explained +there, wxString implements about 90\% of methods of the std::string class (iterators +are not supported, nor all methods which use them). +These standard functions are not documented in this manual so please see the STL documentation. +The behaviour of all these functions is identical to the behaviour described +there (except that wxString is sensitive to null character). + +You may notice that wxString sometimes has many functions which do the same +thing like, for example, \helpref{Length()}{wxstringlength}, +\helpref{Len()}{wxstringlen} and {\tt length()} which all return the string +length. In all cases of such duplication the {\tt std::string}-compatible +method ({\tt length()} in this case, always the lowercase version) should be +used as it will ensure smoother transition to {\tt std::string} when wxWidgets +starts using it instead of wxString. + \wxheading{Derived from} None +\wxheading{Include files} + + + +\wxheading{Predefined objects} + +Objects: + +{\bf wxEmptyString} + \wxheading{See also} \overview{Overview}{wxstringoverview} -\latexignore{\rtfignore{\wxheading{Members}}} +\latexignore{\rtfignore{\wxheading{Function groups}}} + +\membersection{Constructors and assignment operators}\label{constructorsinwxstring} + +A string may be constructed either from a C string, (some number of copies of) +a single character or a wide (UNICODE) string. For all constructors (except the +default which creates an empty string) there is also a corresponding assignment +operator. + +\helpref{wxString}{wxstringconstruct}\\ +\helpref{operator $=$}{wxstringoperatorassign}\\ +\helpref{\destruct{wxString}}{wxstringdestruct} + +\membersection{String length}\label{lengthfunctionsinwxstring} + +These functions return the string length and check whether the string is empty +or empty it. + +\helpref{Len}{wxstringlen}\\ +\helpref{IsEmpty}{wxstringisempty}\\ +\helpref{operator!}{wxstringoperatornot}\\ +\helpref{Empty}{wxstringempty}\\ +\helpref{Clear}{wxstringclear} + +\membersection{Character access}\label{characteraccessinwxstring} + +Many functions in this section take a character index in the string. As with C +strings and/or arrays, the indices start from $0$, so the first character of a +string is string[$0$]. Attempt to access a character beyond the end of the +string (which may be even $0$ if the string is empty) will provoke an assert +failure in \helpref{debug build}{debuggingoverview}, but no checks are done in +release builds. + +This section also contains both implicit and explicit conversions to C style +strings. Although implicit conversion is quite convenient, it is advised to use +explicit \helpref{c\_str()}{wxstringcstr} method for the sake of clarity. Also +see \helpref{overview}{wxstringadvices} for the cases where it is necessary to +use it. + +\helpref{GetChar}{wxstringgetchar}\\ +\helpref{GetWritableChar}{wxstringgetwritablechar}\\ +\helpref{SetChar}{wxstringsetchar}\\ +\helpref{Last}{wxstringlast}\\ +\helpref{operator []}{wxstringoperatorbracket}\\ +\helpref{c\_str}{wxstringcstr}\\ +\helpref{mb\_str}{wxstringmbstr}\\ +\helpref{wc\_str}{wxstringwcstr}\\ +\helpref{fn\_str}{wxstringfnstr}\\ +\helpref{operator const char*}{wxstringoperatorconstcharpt} + +\membersection{Concatenation}\label{concatenationinwxstring} + +Anything may be concatenated (appended to) with a string. However, you can't +append something to a C string (including literal constants), so to do this it +should be converted to a wxString first. + +\helpref{operator \cinsert}{wxstringoperatorout}\\ +\helpref{operator $+=$}{wxstringplusequal}\\ +\helpref{operator $+$}{wxstringoperatorplus}\\ +\helpref{Append}{wxstringappend}\\ +\helpref{Prepend}{wxstringprepend} + +\membersection{Comparison}\label{comparisoninwxstring} + +The default comparison function \helpref{Cmp}{wxstringcmp} is case-sensitive and +so is the default version of \helpref{IsSameAs}{wxstringissameas}. For case +insensitive comparisons you should use \helpref{CmpNoCase}{wxstringcmpnocase} or +give a second parameter to IsSameAs. This last function is may be more +convenient if only equality of the strings matters because it returns a boolean +true value if the strings are the same and not 0 (which is usually false in C) +as {\tt Cmp()} does. + +\helpref{Matches}{wxstringmatches} is a poor man's regular expression matcher: +it only understands '*' and '?' metacharacters in the sense of DOS command line +interpreter. + +\helpref{StartsWith}{wxstringstartswith} is helpful when parsing a line of +text which should start with some predefined prefix and is more efficient than +doing direct string comparison as you would also have to precalculate the +length of the prefix then. + +\helpref{Cmp}{wxstringcmp}\\ +\helpref{CmpNoCase}{wxstringcmpnocase}\\ +\helpref{IsSameAs}{wxstringissameas}\\ +\helpref{Matches}{wxstringmatches}\\ +\helpref{StartsWith}{wxstringstartswith} + +\membersection{Substring extraction}\label{substringextractioninwxstring} + +These functions allow to extract substring from this string. All of them don't +modify the original string and return a new string containing the extracted +substring. + +\helpref{Mid}{wxstringmid}\\ +\helpref{operator()}{wxstringoperatorparenth}\\ +\helpref{Left}{wxstringleft}\\ +\helpref{Right}{wxstringright}\\ +\helpref{BeforeFirst}{wxstringbeforefirst}\\ +\helpref{BeforeLast}{wxstringbeforelast}\\ +\helpref{AfterFirst}{wxstringafterfirst}\\ +\helpref{AfterLast}{wxstringafterlast}\\ +\helpref{StartsWith}{wxstringstartswith} + +\membersection{Case conversion}\label{caseconversioninwxstring} + +The MakeXXX() variants modify the string in place, while the other functions +return a new string which contains the original text converted to the upper or +lower case and leave the original string unchanged. + +\helpref{MakeUpper}{wxstringmakeupper}\\ +\helpref{Upper}{wxstringupper}\\ +\helpref{MakeLower}{wxstringmakelower}\\ +\helpref{Lower}{wxstringlower} + +\membersection{Searching and replacing}\label{searchingandreplacinginwxstring} + +These functions replace the standard {\it strchr()} and {\it strstr()} +functions. + +\helpref{Find}{wxstringfind}\\ +\helpref{Replace}{wxstringreplace} + +\membersection{Conversion to numbers}\label{conversiontonumbersinwxstring} + +The string provides functions for conversion to signed and unsigned integer and +floating point numbers. All three functions take a pointer to the variable to +put the numeric value in and return true if the {\bf entire} string could be +converted to a number. + +\helpref{ToLong}{wxstringtolong}\\ +\helpref{ToULong}{wxstringtoulong}\\ +\helpref{ToDouble}{wxstringtodouble} + +\membersection{Writing values into the string}\label{writingintostringinwxstring} + +Both formatted versions (\helpref{Printf}{wxstringprintf}) and stream-like +insertion operators exist (for basic types only). Additionally, the +\helpref{Format}{wxstringformat} function allows to use simply append +formatted value to a string: + +\begin{verbatim} + // the following 2 snippets are equivalent + + wxString s = "..."; + s += wxString::Format("%d", n); + + wxString s; + s.Printf("...%d", n); +\end{verbatim} + +\helpref{Format}{wxstringformat}\\ +\helpref{FormatV}{wxstringformatv}\\ +\helpref{Printf}{wxstringprintf}\\ +\helpref{PrintfV}{wxstringprintfv}\\ +\helpref{operator \cinsert}{wxstringoperatorout} + +\membersection{Memory management}\label{memoryinwxstring} + +These are "advanced" functions and they will be needed quite rarely. +\helpref{Alloc}{wxstringalloc} and \helpref{Shrink}{wxstringshrink} are only +interesting for optimization purposes. +\helpref{GetWriteBuf}{wxstringgetwritebuf} may be very useful when working with +some external API which requires the caller to provide a writable buffer, but +extreme care should be taken when using it: before performing any other +operation on the string \helpref{UngetWriteBuf}{wxstringungetwritebuf} {\bf +must} be called! + +\helpref{Alloc}{wxstringalloc}\\ +\helpref{Shrink}{wxstringshrink}\\ +\helpref{GetWriteBuf}{wxstringgetwritebuf}\\ +\helpref{UngetWriteBuf}{wxstringungetwritebuf} + +\membersection{Miscellaneous}\label{miscellaneousinwxstring} + +Other string functions. + +\helpref{Trim}{wxstringtrim}\\ +\helpref{Pad}{wxstringpad}\\ +\helpref{Truncate}{wxstringtruncate} + +\membersection{wxWidgets 1.xx compatibility functions}\label{backwardcompatibilityinwxstring} + +These functions are deprecated, please consider using new wxWidgets 2.0 +functions instead of them (or, even better, std::string compatible variants). + +\helpref{SubString}{wxstringsubstring}\\ +\helpref{sprintf}{wxstringsprintf}\\ +\helpref{CompareTo}{wxstringcompareto}\\ +\helpref{Length}{wxstringlength}\\ +\helpref{Freq}{wxstringfreq}\\ +\helpref{LowerCase}{wxstringlowercase}\\ +\helpref{UpperCase}{wxstringuppercase}\\ +\helpref{Strip}{wxstringstrip}\\ +\helpref{Index}{wxstringindex}\\ +\helpref{Remove}{wxstringremove}\\ +\helpref{First}{wxstringfirst}\\ +\helpref{Last}{wxstringlast}\\ +\helpref{Contains}{wxstringcontains}\\ +\helpref{IsNull}{wxstringisnull}\\ +\helpref{IsAscii}{wxstringisascii}\\ +\helpref{IsNumber}{wxstringisnumber}\\ +\helpref{IsWord}{wxstringisword} + +\membersection{std::string compatibility functions}\label{wxstringat} + +The supported functions are only listed here, please see any STL reference for +their documentation. + +\begin{verbatim} + // take nLen chars starting at nPos + wxString(const wxString& str, size_t nPos, size_t nLen); + // take all characters from pStart to pEnd (poor man's iterators) + wxString(const void *pStart, const void *pEnd); + + // lib.string.capacity + // return the length of the string + size_t size() const; + // return the length of the string + size_t length() const; + // return the maximum size of the string + size_t max_size() const; + // resize the string, filling the space with c if c != 0 + void resize(size_t nSize, char ch = '\0'); + // delete the contents of the string + void clear(); + // returns true if the string is empty + bool empty() const; + + // lib.string.access + // return the character at position n + char at(size_t n) const; + // returns the writable character at position n + char& at(size_t n); + + // lib.string.modifiers + // append a string + wxString& append(const wxString& str); + // append elements str[pos], ..., str[pos+n] + wxString& append(const wxString& str, size_t pos, size_t n); + // append first n (or all if n == npos) characters of sz + wxString& append(const char *sz, size_t n = npos); + + // append n copies of ch + wxString& append(size_t n, char ch); + + // same as `this_string = str' + wxString& assign(const wxString& str); + // same as ` = str[pos..pos + n] + wxString& assign(const wxString& str, size_t pos, size_t n); + // same as `= first n (or all if n == npos) characters of sz' + wxString& assign(const char *sz, size_t n = npos); + // same as `= n copies of ch' + wxString& assign(size_t n, char ch); + + // insert another string + wxString& insert(size_t nPos, const wxString& str); + // insert n chars of str starting at nStart (in str) + wxString& insert(size_t nPos, const wxString& str, size_t nStart, size_t n); + + // insert first n (or all if n == npos) characters of sz + wxString& insert(size_t nPos, const char *sz, size_t n = npos); + // insert n copies of ch + wxString& insert(size_t nPos, size_t n, char ch); + + // delete characters from nStart to nStart + nLen + wxString& erase(size_t nStart = 0, size_t nLen = npos); + + // replaces the substring of length nLen starting at nStart + wxString& replace(size_t nStart, size_t nLen, const char* sz); + // replaces the substring with nCount copies of ch + wxString& replace(size_t nStart, size_t nLen, size_t nCount, char ch); + // replaces a substring with another substring + wxString& replace(size_t nStart, size_t nLen, + const wxString& str, size_t nStart2, size_t nLen2); + // replaces the substring with first nCount chars of sz + wxString& replace(size_t nStart, size_t nLen, + const char* sz, size_t nCount); + + // swap two strings + void swap(wxString& str); + + // All find() functions take the nStart argument which specifies the + // position to start the search on, the default value is 0. All functions + // return npos if there were no match. + + // find a substring + size_t find(const wxString& str, size_t nStart = 0) const; + + // find first n characters of sz + size_t find(const char* sz, size_t nStart = 0, size_t n = npos) const; + + // find the first occurrence of character ch after nStart + size_t find(char ch, size_t nStart = 0) const; + + // rfind() family is exactly like find() but works right to left + + // as find, but from the end + size_t rfind(const wxString& str, size_t nStart = npos) const; + + // as find, but from the end + size_t rfind(const char* sz, size_t nStart = npos, + size_t n = npos) const; + // as find, but from the end + size_t rfind(char ch, size_t nStart = npos) const; + + // find first/last occurrence of any character in the set + + // + size_t find_first_of(const wxString& str, size_t nStart = 0) const; + // + size_t find_first_of(const char* sz, size_t nStart = 0) const; + // same as find(char, size_t) + size_t find_first_of(char c, size_t nStart = 0) const; + // + size_t find_last_of (const wxString& str, size_t nStart = npos) const; + // + size_t find_last_of (const char* s, size_t nStart = npos) const; + // same as rfind(char, size_t) + size_t find_last_of (char c, size_t nStart = npos) const; + + // find first/last occurrence of any character not in the set + + // + size_t find_first_not_of(const wxString& str, size_t nStart = 0) const; + // + size_t find_first_not_of(const char* s, size_t nStart = 0) const; + // + size_t find_first_not_of(char ch, size_t nStart = 0) const; + // + size_t find_last_not_of(const wxString& str, size_t nStart=npos) const; + // + size_t find_last_not_of(const char* s, size_t nStart = npos) const; + // + size_t find_last_not_of(char ch, size_t nStart = npos) const; + + // All compare functions return a negative, zero or positive value + // if the [sub]string is less, equal or greater than the compare() argument. + + // just like strcmp() + int compare(const wxString& str) const; + // comparison with a substring + int compare(size_t nStart, size_t nLen, const wxString& str) const; + // comparison of 2 substrings + int compare(size_t nStart, size_t nLen, + const wxString& str, size_t nStart2, size_t nLen2) const; + // just like strcmp() + int compare(const char* sz) const; + // substring comparison with first nCount characters of sz + int compare(size_t nStart, size_t nLen, + const char* sz, size_t nCount = npos) const; + + // substring extraction + wxString substr(size_t nStart = 0, size_t nLen = npos) const; +\end{verbatim} + +%%%%% MEMBERS HERE %%%%% +\helponly{\insertatlevel{2}{ + +\wxheading{Members} + +}} \membersection{wxString::wxString}\label{wxstringconstruct} \func{}{wxString}{\void} -Default constructor. +Default constructor. Initializes the string to {\tt ""} (empty string). \func{}{wxString}{\param{const wxString\&}{ x}} @@ -24,19 +410,51 @@ Copy constructor. Constructs a string of {\it n} copies of character {\it ch}. -\func{}{wxString}{\param{const char*}{ psz}, \param{size\_t}{ nLength = STRING\_MAXLEN}} +\func{}{wxString}{\param{const char*}{ psz}, \param{size\_t}{ nLength = wxSTRING\_MAXLEN}} Takes first {\it nLength} characters from the C string {\it psz}. -The default value of STRING\_MAXLEN means take all the string. +The default value of {\tt wxSTRING\_MAXLEN} means to take all the string. -\func{}{wxString}{\param{const unsigned char*}{ psz}, \param{size\_t}{ nLength = STRING\_MAXLEN}} +Note that this constructor may be used even if {\it psz} points to a buffer +with binary data (i.e. containing {\tt NUL} characters) as long as you provide +the correct value for {\it nLength}. However, the default form of it works +only with strings without intermediate {\tt NUL}s because it uses +{\tt strlen()} to calculate the effective length and it would not give correct +results otherwise. + +\func{}{wxString}{\param{const unsigned char*}{ psz}, \param{size\_t}{ nLength = wxSTRING\_MAXLEN}} For compilers using unsigned char: takes first {\it nLength} characters from the C string {\it psz}. -The default value of STRING\_MAXLEN means take all the string. +The default value of {\tt wxSTRING\_MAXLEN} means take all the string. + +{\bf Note:} In Unicode build, all of the above constructors take +{\tt wchar\_t} arguments instead of {\tt char}. + +\wxheading{Constructors with conversion} -\func{}{wxString}{\param{const wchar\_t*}{ psz}} +The following constructors allow you to construct wxString from wide string +in ANSI build or from C string in Unicode build. -Constructs a string from the wide (UNICODE) string. +\func{}{wxString}{\param{const wchar\_t*}{ psz}, \param{wxMBConv\&}{ conv}, \param{size\_t}{ nLength = wxSTRING\_MAXLEN}} + +Initializes the string from first \arg{nLength} characters of wide string. +The default value of {\tt wxSTRING\_MAXLEN} means take all the string. +In ANSI build, \arg{conv}'s +\helpref{WC2MB}{wxmbconvwc2mb} method is called to +convert \arg{psz} to wide string. It is ignored in Unicode build. + +\func{}{wxString}{\param{const char*}{ psz}, \param{wxMBConv\&}{ conv}, \param{size\_t}{ nLength = wxSTRING\_MAXLEN}} + +Initializes the string from first \arg{nLength} characters of C string. +The default value of {\tt wxSTRING\_MAXLEN} means take all the string. +In Unicode build, \arg{conv}'s +\helpref{MB2WC}{wxmbconvmb2wc} method is called to +convert \arg{psz} to wide string. It is ignored in ANSI build. + +\wxheading{See also} + +\helpref{wxMBConv classes}{mbconvclasses}, \helpref{mb\_str}{wxstringmbstr}, +\helpref{wc\_str}{wxstringwcstr} \membersection{wxString::\destruct{wxString}}\label{wxstringdestruct} @@ -44,13 +462,44 @@ Constructs a string from the wide (UNICODE) string. String destructor. Note that this is not virtual, so wxString must not be inherited from. -\membersection{wxString::Alloc}\label{wxstringAlloc} +\membersection{wxString::Alloc}\label{wxstringalloc} -\func{void}{Alloc}{\param{uint}{ newsize}} +\func{void}{Alloc}{\param{size\_t}{ nLen}} -Preallocate some space for wxString. Only works if the data of this string is not shared. +Preallocate enough space for wxString to store {\it nLen} characters. This function +may be used to increase speed when the string is constructed by repeated +concatenation as in -\membersection{wxString::Append}\label{wxstringAppend} +\begin{verbatim} + +// delete all vowels from the string +wxString DeleteAllVowels(const wxString& original) +{ + wxString result; + + size_t len = original.length(); + + result.Alloc(len); + + for ( size_t n = 0; n < len; n++ ) + { + if ( strchr("aeuio", tolower(original[n])) == NULL ) + result += original[n]; + } + + return result; +} + +\end{verbatim} + +because it will avoid the need to reallocate string memory many times (in case +of long strings). Note that it does not set the maximal length of a string - it +will still expand if more than {\it nLen} characters are stored in it. Also, it +does not truncate the existing string (use +\helpref{Truncate()}{wxstringtruncate} for this) even if its current length is +greater than {\it nLen} + +\membersection{wxString::Append}\label{wxstringappend} \func{wxString\&}{Append}{\param{const char*}{ psz}} @@ -61,19 +510,53 @@ Concatenates {\it psz} to this string, returning a reference to it. Concatenates character {\it ch} to this string, {\it count} times, returning a reference to it. -\membersection{wxString::After}\label{wxstringAfter} +\membersection{wxString::AfterFirst}\label{wxstringafterfirst} + +\constfunc{wxString}{AfterFirst}{\param{char}{ ch}} + +Gets all the characters after the first occurrence of {\it ch}. +Returns the empty string if {\it ch} is not found. + +\membersection{wxString::AfterLast}\label{wxstringafterlast} + +\constfunc{wxString}{AfterLast}{\param{char}{ ch}} -\constfunc{wxString}{After}{\param{char}{ ch}} +Gets all the characters after the last occurrence of {\it ch}. +Returns the whole string if {\it ch} is not found. + +\membersection{wxString::BeforeFirst}\label{wxstringbeforefirst} + +\constfunc{wxString}{BeforeFirst}{\param{char}{ ch}} + +Gets all characters before the first occurrence of {\it ch}. +Returns the whole string if {\it ch} is not found. + +\membersection{wxString::BeforeLast}\label{wxstringbeforelast} + +\constfunc{wxString}{BeforeLast}{\param{char}{ ch}} -Gets all the characters after the first occurence of {\it ch}. +Gets all characters before the last occurrence of {\it ch}. Returns the empty string if {\it ch} is not found. -\membersection{wxString::Before}\label{wxstringBefore} +\membersection{wxString::c\_str}\label{wxstringcstr} + +\constfunc{const char *}{c\_str}{\void} + +Returns a pointer to the string data ({\tt const char*} in ANSI build, +{\tt const wchar\_t*} in Unicode build). + +\wxheading{See also} + +\helpref{mb\_str}{wxstringmbstr}, \helpref{wc\_str}{wxstringwcstr}, +\helpref{fn\_str}{wxstringfnstr} + +\membersection{wxString::Clear}\label{wxstringclear} + +\func{void}{Clear}{\void} -\constfunc{wxString}{Before}{\param{char}{ ch}} +Empties the string and frees memory occupied by it. -Gets all characters before the last occurence of {\it ch}. -Returns empty string if {\it ch} is not found. +See also: \helpref{Empty}{wxstringempty} \membersection{wxString::Cmp}\label{wxstringcmp} @@ -81,9 +564,11 @@ Returns empty string if {\it ch} is not found. Case-sensitive comparison. -Returns 0 if equal, +1 if greater or -1 if less. +Returns a positive value if the string is greater than the argument, zero if +it is equal to it or a negative value if it is less than the argument (same semantics +as the standard {\it strcmp()} function). -See also CmpNoCase, IsSameAs. +See also \helpref{CmpNoCase}{wxstringcmpnocase}, \helpref{IsSameAs}{wxstringissameas}. \membersection{wxString::CmpNoCase}\label{wxstringcmpnocase} @@ -91,36 +576,40 @@ See also CmpNoCase, IsSameAs. Case-insensitive comparison. -Returns 0 if equal, +1 if greater or -1 if less. +Returns a positive value if the string is greater than the argument, zero if +it is equal to it or a negative value if it is less than the argument (same semantics +as the standard {\it strcmp()} function). -See also Cmp, IsSameAs. +See also \helpref{Cmp}{wxstringcmp}, \helpref{IsSameAs}{wxstringissameas}. -\membersection{wxString::CompareTo}\label{wxstringCompareTo} +\membersection{wxString::CompareTo}\label{wxstringcompareto} \begin{verbatim} #define NO_POS ((int)(-1)) // undefined position enum caseCompare {exact, ignoreCase}; \end{verbatim} - + \constfunc{int}{CompareTo}{\param{const char*}{ psz}, \param{caseCompare}{ cmp = exact}} Case-sensitive comparison. Returns 0 if equal, 1 if greater or -1 if less. -\membersection{wxString::Contains}\label{wxstringContains} +\membersection{wxString::Contains}\label{wxstringcontains} -\func{bool}{Contains}{\param{const wxString\&}{ str}} +\constfunc{bool}{Contains}{\param{const wxString\&}{ str}} -Returns 1 if target appears anyhere in wxString; else 0. +Returns 1 if target appears anywhere in wxString; else 0. \membersection{wxString::Empty}\label{wxstringempty} \func{void}{Empty}{\void} -Reinitializes the string and frees the data. +Makes the string empty, but doesn't free memory occupied by the string. + +See also: \helpref{Clear()}{wxstringclear}. \membersection{wxString::Find}\label{wxstringfind} -\constfunc{int}{Find}{\param{char}{ ch}, \param{bool}{ fromEnd = FALSE}} +\constfunc{int}{Find}{\param{char}{ ch}, \param{bool}{ fromEnd = false}} Searches for the given character. Returns the starting index, or -1 if not found. @@ -130,15 +619,72 @@ Searches for the given string. Returns the starting index, or -1 if not found. \membersection{wxString::First}\label{wxstringfirst} -\func{size\_t}{First}{\param{char}{ c}} +\func{int}{First}{\param{char}{ c}} + +\constfunc{int}{First}{\param{const char*}{ psz}} + +\constfunc{int}{First}{\param{const wxString\&}{ str}} + +Same as \helpref{Find}{wxstringfind}. + +\membersection{wxString::fn\_str}\label{wxstringfnstr} + +\constfunc{const wchar\_t*}{fn\_str}{\void} + +\constfunc{const char*}{fn\_str}{\void} + +\constfunc{const wxCharBuffer}{fn\_str}{\void} + +Returns string representation suitable for passing to OS' functions for +file handling. In ANSI build, this is same as \helpref{c\_str}{wxstringcstr}. +In Unicode build, returned value can be either wide character string +or C string in charset matching the {\tt wxConvFile} object, depending on +the OS. + +\wxheading{See also} + +\helpref{wxMBConv}{wxmbconv}, +\helpref{wc\_str}{wxstringwcstr}, \helpref{mb\_str}{wxstringwcstr} + +\membersection{wxString::Format}\label{wxstringformat} + +\func{static wxString}{Format}{\param{const wxChar }{*format}, \param{}{...}} + +This static function returns the string containing the result of calling +\helpref{Printf}{wxstringprintf} with the passed parameters on it. + +\wxheading{See also} + +\helpref{FormatV}{wxstringformatv}, \helpref{Printf}{wxstringprintf} + +\membersection{wxString::FormatV}\label{wxstringformatv} + +\func{static wxString}{FormatV}{\param{const wxChar }{*format}, \param{va\_list }{argptr}} + +This static function returns the string containing the result of calling +\helpref{PrintfV}{wxstringprintfv} with the passed parameters on it. + +\wxheading{See also} + +\helpref{Format}{wxstringformat}, \helpref{PrintfV}{wxstringprintfv} + +\membersection{wxString::Freq}\label{wxstringfreq} + +\constfunc{int}{Freq}{\param{char }{ch}} + +Returns the number of occurrences of {\it ch} in the string. -\constfunc{size\_t}{First}{\param{const char*}{ psz}} +\membersection{wxString::FromAscii}\label{wxstringfromascii} -\constfunc{size\_t}{First}{\param{const wxString\&}{ str}} +\func{static wxString }{FromAscii}{\param{const char*}{ s}} -\constfunc{size\_t}{First}{\param{const char}{ ch}} +\func{static wxString }{FromAscii}{\param{const char}{ c}} -Returns the first occurrence of the item. +Converts the string or character from an ASCII, 7-bit form +to the native wxString representation. Most useful when using +a Unicode build of wxWidgets. +Use \helpref{wxString constructors}{wxstringconstruct} if you +need to convert from another charset. \membersection{wxString::GetChar}\label{wxstringgetchar} @@ -146,11 +692,11 @@ Returns the first occurrence of the item. Returns the character at position {\it n} (read-only). -\membersection{wxString::GetData}\label{wxstringGetData} +\membersection{wxString::GetData}\label{wxstringgetdata} \constfunc{const char*}{GetData}{\void} -wxWindows compatibility conversion. Returns a constant pointer to the data in the string. +wxWidgets compatibility conversion. Returns a constant pointer to the data in the string. \membersection{wxString::GetWritableChar}\label{wxstringgetwritablechar} @@ -160,82 +706,82 @@ Returns a reference to the character at position {\it n}. \membersection{wxString::GetWriteBuf}\label{wxstringgetwritebuf} -\func{char*}{GetWriteBuf}{\param{uint}{ len}} +\func{wxChar*}{GetWriteBuf}{\param{size\_t}{ len}} Returns a writable buffer of at least {\it len} bytes. +It returns a pointer to a new memory block, and the +existing data will not be copied. Call \helpref{wxString::UngetWriteBuf}{wxstringungetwritebuf} as soon as possible to put the string back into a reasonable state. -\membersection{wxString::Index}\label{wxstringIndex} +\membersection{wxString::Index}\label{wxstringindex} -\constfunc{size\_t}{Index}{\param{char}{ ch}, \param{int}{ startpos = 0}} - -Same as \helpref{wxString::Find}{wxstringfind}. +\constfunc{size\_t}{Index}{\param{char}{ ch}} \constfunc{size\_t}{Index}{\param{const char*}{ sz}} Same as \helpref{wxString::Find}{wxstringfind}. -\constfunc{size\_t}{Index}{\param{const char*}{ sz}, \param{bool}{ caseSensitive = TRUE}, \param{bool}{ fromEnd = FALSE}} - -Search the element in the array, starting from either side. - -If {\it fromEnd} is TRUE, reverse search direction. - -If {\bf caseSensitive}, comparison is case sensitive (the default). - -Returns the index of the first item matched, or NOT\_FOUND. - -\membersection{wxString::Insert}\label{wxstringInsert} - -\func{void}{Insert}{\param{const wxString\&}{ str}, \param{uint}{ index}} - -Add new element at the given position. - -\membersection{wxString::IsAscii}\label{wxstringIsAscii} +% TODO +%\membersection{wxString::insert}\label{wxstringinsert} +% Wrong! +%\func{void}{insert}{\param{const wxString\&}{ str}, \param{size\_t}{ index}} +% +%Add new element at the given position. +% +\membersection{wxString::IsAscii}\label{wxstringisascii} \constfunc{bool}{IsAscii}{\void} -Returns TRUE if the string is ASCII. +Returns true if the string contains only ASCII characters. \membersection{wxString::IsEmpty}\label{wxstringisempty} \constfunc{bool}{IsEmpty}{\void} -Returns TRUE if the string is NULL. +Returns true if the string is empty. -\membersection{wxString::IsNull}\label{wxstringIsNull} +\membersection{wxString::IsNull}\label{wxstringisnull} \constfunc{bool}{IsNull}{\void} -Returns TRUE if the string is NULL (same as IsEmpty). +Returns true if the string is empty (same as \helpref{IsEmpty}{wxstringisempty}). -\membersection{wxString::IsNumber}\label{wxstringIsNumber} +\membersection{wxString::IsNumber}\label{wxstringisnumber} \constfunc{bool}{IsNumber}{\void} -Returns TRUE if the string is a number. +Returns true if the string is an integer (with possible sign). \membersection{wxString::IsSameAs}\label{wxstringissameas} -\constfunc{bool}{IsSameAs}{\param{const char*}{ psz}, \param{bool}{ caseSensitive = TRUE}} +\constfunc{bool}{IsSameAs}{\param{const char*}{ psz}, \param{bool}{ caseSensitive = true}} Test for string equality, case-sensitive (default) or not. -caseSensitive is TRUE by default (case matters). +caseSensitive is true by default (case matters). + +Returns true if strings are equal, false otherwise. + +See also \helpref{Cmp}{wxstringcmp}, \helpref{CmpNoCase}{wxstringcmpnocase} -Returns TRUE if strings are equal, FALSE otherwise. +\constfunc{bool}{IsSameAs}{\param{char}{ c}, \param{bool}{ caseSensitive = true}} -See also Cmp, CmpNoCase. +Test whether the string is equal to the single character {\it c}. The test is +case-sensitive if {\it caseSensitive} is true (default) or not if it is false. -\membersection{wxString::IsWord}\label{wxstringIsWord} +Returns true if the string is equal to the character, false otherwise. + +See also \helpref{Cmp}{wxstringcmp}, \helpref{CmpNoCase}{wxstringcmpnocase} + +\membersection{wxString::IsWord}\label{wxstringisword} \constfunc{bool}{IsWord}{\void} -Returns TRUE if the string is a word. TODO: what's the definition of a word? +Returns true if the string is a word. TODO: what's the definition of a word? -\membersection{wxString::Last}\label{wxstringLast} +\membersection{wxString::Last}\label{wxstringlast} \constfunc{char}{Last}{\void} @@ -249,12 +795,7 @@ Returns a reference to the last character (writable). \constfunc{wxString}{Left}{\param{size\_t}{ count}} -Returns the first {\it count} characters. - -\constfunc{wxString}{Left}{\param{char}{ ch}} - -Returns all characters before the first occurence of {\it ch}. -Returns the whole string if {\it ch} is not found. +Returns the first {\it count} characters of the string. \membersection{wxString::Len}\label{wxstringlen} @@ -268,7 +809,13 @@ Returns the length of the string. Returns the length of the string (same as Len). -\membersection{wxString::LowerCase}\label{wxstringLowerCase} +\membersection{wxString::Lower}\label{wxstringlower} + +\constfunc{wxString}{Lower}{\void} + +Returns this string converted to the lower case. + +\membersection{wxString::LowerCase}\label{wxstringlowercase} \func{void}{LowerCase}{\void} @@ -276,38 +823,56 @@ Same as MakeLower. \membersection{wxString::MakeLower}\label{wxstringmakelower} -\func{void}{MakeLower}{\void} +\func{wxString\&}{MakeLower}{\void} -Converts all characters to lower case. +Converts all characters to lower case and returns the result. \membersection{wxString::MakeUpper}\label{wxstringmakeupper} -\func{void}{MakeUpper}{\void} +\func{wxString\&}{MakeUpper}{\void} -Converts all characters to upper case. +Converts all characters to upper case and returns the result. -\membersection{wxString::Matches}\label{wxstringMatches} +\membersection{wxString::Matches}\label{wxstringmatches} \constfunc{bool}{Matches}{\param{const char*}{ szMask}} -Returns TRUE if the string contents matches a mask containing '*' and '?'. +Returns true if the string contents matches a mask containing '*' and '?'. + +\membersection{wxString::mb\_str}\label{wxstringmbstr} + +\constfunc{const char*}{mb\_str}{\param{wxMBConv\&}{ conv}} + +\constfunc{const wxCharBuffer}{mb\_str}{\param{wxMBConv\&}{ conv}} + +Returns multibyte (C string) representation of the string. +In Unicode build, converts using \arg{conv}'s \helpref{cWC2MB}{wxmbconvcwc2mb} +method and returns wxCharBuffer. In ANSI build, this function is same +as \helpref{c\_str}{wxstringcstr}. +The macro wxWX2MBbuf is defined as the correct return type (without const). + +\wxheading{See also} + +\helpref{wxMBConv}{wxmbconv}, +\helpref{c\_str}{wxstringcstr}, \helpref{wc\_str}{wxstringwcstr}, +\helpref{fn\_str}{wxstringfnstr} \membersection{wxString::Mid}\label{wxstringmid} -\constfunc{wxString}{Mid}{\param{size\_t}{ first}, \param{size\_t}{ count = STRING\_MAXLEN}} +\constfunc{wxString}{Mid}{\param{size\_t}{ first}, \param{size\_t}{ count = wxSTRING\_MAXLEN}} Returns a substring starting at {\it first}, with length {\it count}, or the rest of the string if {\it count} is the default value. \membersection{wxString::Pad}\label{wxstringpad} -\func{wxString\&}{Pad}{\param{size\_t}{ count}, \param{char}{ pad = ' '}, \param{bool}{ fromRight = TRUE}} +\func{wxString\&}{Pad}{\param{size\_t}{ count}, \param{char}{ pad = ' '}, \param{bool}{ fromRight = true}} Adds {\it count} copies of {\it pad} to the beginning, or to the end of the string (the default). Removes spaces from the left or from the right (default). -\membersection{wxString::Prepend}\label{wxstringPrepend} +\membersection{wxString::Prepend}\label{wxstringprepend} \func{wxString\&}{Prepend}{\param{const wxString\&}{ str}} @@ -317,8 +882,13 @@ Prepends {\it str} to this string, returning a reference to this string. \func{int}{Printf}{\param{const char* }{pszFormat}, \param{}{...}} -Similar to sprintf. Returns the number of characters written, or an integer less than zero -on error. +Similar to the standard function {\it sprintf()}. Returns the number of +characters written, or an integer less than zero on error. + +{\bf NB:} This function will use a safe version of {\it vsprintf()} (usually called +{\it vsnprintf()}) whenever available to always allocate the buffer of correct +size. Unfortunately, this function is not available on all platforms and the +dangerous {\it vsprintf()} will be used then which may lead to buffer overflows. \membersection{wxString::PrintfV}\label{wxstringprintfv} @@ -327,7 +897,7 @@ on error. Similar to vprintf. Returns the number of characters written, or an integer less than zero on error. -\membersection{wxString::Remove}\label{wxstringRemove} +\membersection{wxString::Remove}\label{wxstringremove} \func{wxString\&}{Remove}{\param{size\_t}{ pos}} @@ -335,7 +905,7 @@ Same as Truncate. Removes the portion from {\it pos} to the end of the string. \func{wxString\&}{Remove}{\param{size\_t}{ pos}, \param{size\_t}{ len}} -Removes the last {\it len} characters from the string, starting at {\it pos}. +Removes the {\it len} characters from the string, starting at {\it pos}. \membersection{wxString::RemoveLast}\label{wxstringremovelast} @@ -343,13 +913,13 @@ Removes the last {\it len} characters from the string, starting at {\it pos}. Removes the last character. -\membersection{wxString::Replace}\label{wxstringReplace} +\membersection{wxString::Replace}\label{wxstringreplace} -\func{uint}{Replace}{\param{const char*}{ szOld}, \param{const char*}{ szNew}, \param{bool}{ replaceAll}} +\func{size\_t}{Replace}{\param{const char*}{ szOld}, \param{const char*}{ szNew}, \param{bool}{ replaceAll = true}} -Replace first (or all) occurences of substring with another one. +Replace first (or all) occurrences of substring with another one. -{\it replaceAll}: global replace (default), or only the first occurence. +{\it replaceAll}: global replace (default), or only the first occurrence. Returns the number of replacements made. @@ -359,11 +929,6 @@ Returns the number of replacements made. Returns the last {\it count} characters. -\constfunc{wxString}{Right}{\param{char}{ ch}} - -Returns all characters after the last occurence of {\it ch}. -Returns the whole string if {\it ch} is not found. - \membersection{wxString::SetChar}\label{wxstringsetchar} \func{void}{SetChar}{\param{size\_t}{ n}, \param{char}{ch}} @@ -374,7 +939,8 @@ Sets the character at position {\it n}. \func{void}{Shrink}{\void} -Minimizes the string's memory. Only works if the data of this string is not shared. +Minimizes the string's memory. This can be useful after a call to +\helpref{Alloc()}{wxstringalloc} if too much memory were preallocated. \membersection{wxString::sprintf}\label{wxstringsprintf} @@ -382,7 +948,17 @@ Minimizes the string's memory. Only works if the data of this string is not shar The same as Printf. -\membersection{wxString::Strip}\label{wxstringStrip} +\membersection{wxString::StartsWith}\label{wxstringstartswith} + +\constfunc{bool}{StartsWith}{\param{const wxChar }{*prefix}, \param{wxString }{*rest = NULL}} + +This function can be used to test if the string starts with the specified +{\it prefix}. If it does, the function will return {\tt true} and put the rest +of the string (i.e. after the prefix) into {\it rest} string if it is not +{\tt NULL}. Otherwise, the function returns {\tt false} and doesn't modify the +{\it rest}. + +\membersection{wxString::Strip}\label{wxstringstrip} \begin{verbatim} enum stripType {leading = 0x1, trailing = 0x2, both = 0x3}; @@ -393,9 +969,86 @@ enum stripType {leading = 0x1, trailing = 0x2, both = 0x3}; Strip characters at the front and/or end. The same as Trim except that it doesn't change this string. +\membersection{wxString::SubString}\label{wxstringsubstring} + +\constfunc{wxString}{SubString}{\param{size\_t}{ from}, \param{size\_t}{ to}} + +Deprecated, use \helpref{Mid}{wxstringmid} instead (but note that parameters +have different meaning). + +Returns the part of the string between the indices {\it from} and {\it to} +inclusive. + +\membersection{wxString::ToAscii}\label{wxstringtoascii} + +\constfunc{const char*}{ToAscii}{\void} + +Converts the string to an ASCII, 7-bit string (ANSI builds only). + +\constfunc{const wxCharBuffer}{ToAscii}{\void} + +Converts the string to an ASCII, 7-bit string in the form of +a wxCharBuffer (Unicode builds only). + +Note that this conversion only works if the string contains only ASCII +characters. The \helpref{mb\_str}{wxstringmbstr} method provides more +powerful means of converting wxString to C string. + +\membersection{wxString::ToDouble}\label{wxstringtodouble} + +\constfunc{bool}{ToDouble}{\param{double}{ *val}} + +Attempts to convert the string to a floating point number. Returns true on +success (the number is stored in the location pointed to by {\it val}) or false +if the string does not represent such number. + +\wxheading{See also} + +\helpref{wxString::ToLong}{wxstringtolong},\\ +\helpref{wxString::ToULong}{wxstringtoulong} + +\membersection{wxString::ToLong}\label{wxstringtolong} + +\constfunc{bool}{ToLong}{\param{long}{ *val}, \param{int }{base = $10$}} + +Attempts to convert the string to a signed integer in base {\it base}. Returns +{\tt true} on success in which case the number is stored in the location +pointed to by {\it val} or {\tt false} if the string does not represent a +valid number in the given base. + +The value of {\it base} must be comprised between $2$ and $36$, inclusive, or +be a special value $0$ which means that the usual rules of {\tt C} numbers are +applied: if the number starts with {\tt 0x} it is considered to be in base +$16$, if it starts with {\tt 0} - in base $8$ and in base $10$ otherwise. Note +that you may not want to specify the base $0$ if you are parsing the numbers +which may have leading zeroes as they can yield unexpected (to the user not +familiar with C) results. + +\wxheading{See also} + +\helpref{wxString::ToDouble}{wxstringtodouble},\\ +\helpref{wxString::ToULong}{wxstringtoulong} + +\membersection{wxString::ToULong}\label{wxstringtoulong} + +\constfunc{bool}{ToULong}{\param{unsigned long}{ *val}, \param{int }{base = $10$}} + +Attempts to convert the string to an unsigned integer in base {\it base}. +Returns {\tt true} on success in which case the number is stored in the +location pointed to by {\it val} or {\tt false} if the string does not +represent a valid number in the given base. + +See \helpref{wxString::ToLong}{wxstringtolong} for the more detailed +description of the {\it base} parameter. + +\wxheading{See also} + +\helpref{wxString::ToDouble}{wxstringtodouble},\\ +\helpref{wxString::ToLong}{wxstringtolong} + \membersection{wxString::Trim}\label{wxstringtrim} -\func{wxString\&}{Trim}{\param{bool}{ fromRight = TRUE}} +\func{wxString\&}{Trim}{\param{bool}{ fromRight = true}} Removes spaces from the left or from the right (default). @@ -409,15 +1062,60 @@ Truncate the string to the given length. \func{void}{UngetWriteBuf}{\void} -Puts the string back into a reasonable state, after +\func{void}{UngetWriteBuf}{\param{size\_t }{len}} + +Puts the string back into a reasonable state (in which it can be used +normally), after \rtfsp\helpref{wxString::GetWriteBuf}{wxstringgetwritebuf} was called. -\membersection{wxString::UpperCase}\label{wxstringUpperCase} +The version of the function without the {\it len} parameter will calculate the +new string length itself assuming that the string is terminated by the first +{\tt NUL} character in it while the second one will use the specified length +and thus is the only version which should be used with the strings with +embedded {\tt NUL}s (it is also slightly more efficient as {\tt strlen()} +doesn't have to be called). + +\membersection{wxString::Upper}\label{wxstringupper} + +\constfunc{wxString}{Upper}{\void} + +Returns this string converted to upper case. + +\membersection{wxString::UpperCase}\label{wxstringuppercase} \func{void}{UpperCase}{\void} The same as MakeUpper. +\membersection{wxString::wc\_str}\label{wxstringwcstr} + +\constfunc{const wchar\_t*}{wc\_str}{\param{wxMBConv\&}{ conv}} + +\constfunc{const wxWCharBuffer}{wc\_str}{\param{wxMBConv\&}{ conv}} + +Returns wide character representation of the string. +In ANSI build, converts using \arg{conv}'s \helpref{cMB2WC}{wxmbconvcmb2wc} +method and returns wxWCharBuffer. In Unicode build, this function is same +as \helpref{c\_str}{wxstringcstr}. +The macro wxWX2WCbuf is defined as the correct return type (without const). + +\wxheading{See also} + +\helpref{wxMBConv}{wxmbconv}, +\helpref{c\_str}{wxstringcstr}, \helpref{mb\_str}{wxstringwcstr}, +\helpref{fn\_str}{wxstringfnstr} + +\membersection{wxString::operator!}\label{wxstringoperatornot} + +\constfunc{bool}{operator!}{\void} + +Empty string is false, so !string will only return true if the string is empty. +This allows the tests for NULLness of a {\it const char *} pointer and emptiness +of the string to look the same in the code and makes it easier to port old code +to wxString. + +See also \helpref{IsEmpty()}{wxstringisempty}. + \membersection{wxString::operator $=$}\label{wxstringoperatorassign} \func{wxString\&}{operator $=$}{\param{const wxString\&}{ str}} @@ -430,11 +1128,13 @@ The same as MakeUpper. \func{wxString\&}{operator $=$}{\param{const wchar\_t*}{ pwz}} -Assignment. +Assignment: the effect of each operation is the same as for the corresponding +constructor (see \helpref{wxString constructors}{wxstringconstruct}). -\membersection{operator wxString::$+$}\label{wxstringoperatorplus} +\membersection{wxString::operator $+$}\label{wxstringoperatorplus} -Concatenation. +Concatenation: all these operators return a new string equal to the +concatenation of the operands. \func{wxString}{operator $+$}{\param{const wxString\&}{ x}, \param{const wxString\&}{ y}} @@ -444,7 +1144,7 @@ Concatenation. \func{wxString}{operator $+$}{\param{const char*}{ x}, \param{const wxString\&}{ y}} -\membersection{wxString::operator $+=$}\label{wxstringPlusEqual} +\membersection{wxString::operator $+=$}\label{wxstringplusequal} \func{void}{operator $+=$}{\param{const wxString\&}{ str}} @@ -452,7 +1152,7 @@ Concatenation. \func{void}{operator $+=$}{\param{char}{ c}} -Concatenation. +Concatenation in place: the argument is appended to the string. \membersection{wxString::operator []}\label{wxstringoperatorbracket} @@ -472,14 +1172,24 @@ Same as Mid (substring extraction). \membersection{wxString::operator \cinsert}\label{wxstringoperatorout} -\func{wxString\&}{operator \cinsert}{\\param{const wxString\&}{ str}} +\func{wxString\&}{operator \cinsert}{\param{const wxString\&}{ str}} -\func{wxString\&}{operator \cinsert}{\\param{const char*}{ psz}} +\func{wxString\&}{operator \cinsert}{\param{const char*}{ psz}} -\func{wxString\&}{operator \cinsert}{\\param{char }{ch}} +\func{wxString\&}{operator \cinsert}{\param{char }{ch}} Same as $+=$. +\func{wxString\&}{operator \cinsert}{\param{int}{ i}} + +\func{wxString\&}{operator \cinsert}{\param{float}{ f}} + +\func{wxString\&}{operator \cinsert}{\param{double}{ d}} + +These functions work as C++ stream insertion operators: they insert the given +value into the string. Precision or format cannot be set using them, you can use +\helpref{Printf}{wxstringprintf} for this. + \membersection{wxString::operator \cextract}\label{wxstringoperatorin} \func{friend istream\&}{operator \cextract}{\param{istream\&}{ is}, \param{wxString\&}{ str}} @@ -492,7 +1202,7 @@ Extraction from a stream. Implicit conversion to a C string. -\membersection{Comparison operators}\label{wxstringComparison} +\membersection{Comparison operators}\label{wxstringcomparison} \func{bool}{operator $==$}{\param{const wxString\&}{ x}, \param{const wxString\&}{ y}} @@ -523,3 +1233,139 @@ Implicit conversion to a C string. These comparisons are case-sensitive. +\section{\class{wxStringBuffer}}\label{wxstringbuffer} + +This tiny class allows to conveniently access the \helpref{wxString}{wxstring} +internal buffer as a writable pointer without any risk of forgetting to restore +the string to the usable state later. + +For example, assuming you have a low-level OS function called +{\tt GetMeaningOfLifeAsString(char *)} returning the value in the provided +buffer (which must be writable, of course) you might call it like this: + +\begin{verbatim} + wxString theAnswer; + GetMeaningOfLifeAsString(wxStringBuffer(theAnswer, 1024)); + if ( theAnswer != "42" ) + { + wxLogError("Something is very wrong!"); + } +\end{verbatim} + +Note that the exact usage of this depends on whether on not wxUSE\_STL is enabled. If +wxUSE\_STL is enabled, wxStringBuffer creates a seperate empty character buffer, and +if wxUSE\_STL is disabled, it uses GetWriteBuf() from wxString, keeping the same buffer +wxString uses intact. In other words, relying on wxStringBuffer containing the old +wxString data is probably not a good idea if you want to build your program in both +with and without wxUSE\_STL. + +\wxheading{Derived from} + +None + +\wxheading{Include files} + + + +\latexignore{\rtfignore{\wxheading{Members}}} + +\membersection{wxStringBuffer::wxStringBuffer}\label{wxstringbufferctor} + +\func{}{wxStringBuffer}{\param{const wxString\& }{str}, \param{size\_t }{len}} + +Constructs a writable string buffer object associated with the given string +and containing enough space for at least {\it len} characters. Basically, this +is equivalent to calling \helpref{GetWriteBuf}{wxstringgetwritebuf} and +saving the result. + +\membersection{wxStringBuffer::\destruct{wxStringBuffer}}\label{wxstringbufferdtor} + +\func{}{\destruct{wxStringBuffer}}{\void} + +Restores the string passed to the constructor to the usable state by calling +\helpref{UngetWriteBuf}{wxstringungetwritebuf} on it. + +\membersection{wxStringBuffer::operator wxChar *}\label{wxstringbufferwxchar} + +\func{wxChar *}{operator wxChar *}{\void} + +Returns the writable pointer to a buffer of the size at least equal to the +length specified in the constructor. + + + +\section{\class{wxStringBufferLength}}\label{wxstringbufferlength} + +This tiny class allows to conveniently access the \helpref{wxString}{wxstring} +internal buffer as a writable pointer without any risk of forgetting to restore +the string to the usable state later, and allows the user to set the internal +length of the string. + +For example, assuming you have a low-level OS function called +{\tt int GetMeaningOfLifeAsString(char *)} copying the value in the provided +buffer (which must be writable, of course), and returning the actual length +of the string, you might call it like this: + +\begin{verbatim} + wxString theAnswer; + wxStringBuffer theAnswerBuffer(theAnswer, 1024); + int nLength = GetMeaningOfLifeAsString(theAnswerBuffer); + theAnswerBuffer.SetLength(nLength); + if ( theAnswer != "42" ) + { + wxLogError("Something is very wrong!"); + } +\end{verbatim} + +Note that the exact usage of this depends on whether on not wxUSE\_STL is enabled. If +wxUSE\_STL is enabled, wxStringBuffer creates a seperate empty character buffer, and +if wxUSE\_STL is disabled, it uses GetWriteBuf() from wxString, keeping the same buffer +wxString uses intact. In other words, relying on wxStringBuffer containing the old +wxString data is probably not a good idea if you want to build your program in both +with and without wxUSE\_STL. + +Note that SetLength {\tt must} be called before wxStringBufferLength destructs. + +\wxheading{Derived from} + +None + +\wxheading{Include files} + + + +\latexignore{\rtfignore{\wxheading{Members}}} + +\membersection{wxStringBufferLength::wxStringBufferLength}\label{wxstringbufferlengthctor} + +\func{}{wxStringBuffer}{\param{const wxString\& }{str}, \param{size\_t }{len}} + +Constructs a writable string buffer object associated with the given string +and containing enough space for at least {\it len} characters. Basically, this +is equivalent to calling \helpref{GetWriteBuf}{wxstringgetwritebuf} and +saving the result. + +\membersection{wxStringBufferLength::\destruct{wxStringBufferLength}}\label{wxstringbufferlengthdtor} + +\func{}{\destruct{wxStringBufferLength}}{\void} + +Restores the string passed to the constructor to the usable state by calling +\helpref{UngetWriteBuf}{wxstringungetwritebuf} on it. + +\membersection{wxStringBufferLength::SetLength}\label{wxstringbufferlengthsetlength} + +\func{void}{SetLength}{\param{size\_t }{nLength}} + +Sets the internal length of the string referred to by wxStringBufferLength to +{\it nLength} characters. + +Must be called before wxStringBufferLength destructs. + +\membersection{wxStringBufferLength::operator wxChar *}\label{wxstringbufferlengthwxchar} + +\func{wxChar *}{operator wxChar *}{\void} + +Returns the writable pointer to a buffer of the size at least equal to the +length specified in the constructor. + +