The behaviour of all these functions is identical to the behaviour described
there.
+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 wxWindows
+starts using it instead of wxString.
+
\wxheading{Derived from}
None
\membersection{Constructors and assignment operators}
-A strign may be constructed either from a C string, (some number of copies of)
+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.
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 provocate an assert
+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.
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 Cmp does.
+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{Matches}{wxstringmatches}\\
+\helpref{StartsWith}{wxstringstartswith}
\membersection{Substring extraction}
\helpref{BeforeFirst}{wxstringbeforefirst}\\
\helpref{BeforeLast}{wxstringbeforelast}\\
\helpref{AfterFirst}{wxstringafterfirst}\\
-\helpref{AfterLast}{wxstringafterlast}
+\helpref{AfterLast}{wxstringafterlast}\\
+\helpref{StartsWith}{wxstringstartswith}
\membersection{Case conversion}
The MakeXXX() variants modify the string in place, while the other functions
-return a new string which containts the original text converted to the upper or
+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}\\
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
+put the numeric value in and return true if the {\bf entire} string could be
converted to a number.
\helpref{ToLong}{wxstringtolong}\\
\membersection{Memory management}
-These are "advanced" functions and they will be needed quite rarily.
+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
\helpref{Pad}{wxstringpad}\\
\helpref{Truncate}{wxstringtruncate}
-\membersection{wxWindows 1.xx compatiblity functions}
+\membersection{wxWindows 1.xx compatibility functions}
-These functiosn are deprecated, please consider using new wxWindows 2.0
+These functions are deprecated, please consider using new wxWindows 2.0
functions instead of them (or, even better, std::string compatible variants).
\helpref{SubString}{wxstringsubstring}\\
// find first n characters of sz
size_t find(const char* sz, size_t nStart = 0, size_t n = npos) const;
- // find the first occurence of character ch after nStart
+ // 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(char ch, size_t nStart = npos) const;
- // find first/last occurence of any character in the set
+ // find first/last occurrence of any character in the set
//
size_t find_first_of(const wxString& str, size_t nStart = 0) const;
// same as rfind(char, size_t)
size_t find_last_of (char c, size_t nStart = npos) const;
- // find first/last occurence of any character not in the set
+ // 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;
\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 wxSTRING\_MAXLEN means take all the string.
+The default value of wxSTRING\_MAXLEN means to take all the string.
+
+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}}
\constfunc{wxString}{AfterFirst}{\param{char}{ ch}}
-Gets all the characters after the first occurence of {\it 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}}
-Gets all the characters after the last occurence of {\it 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 occurence of {\it 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 characters before the last 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::c\_str}\label{wxstringcstr}
Case-sensitive comparison.
Returns a positive value if the string is greater than the argument, zero if
-it si equal to it or negative value if it is less than argument (same semantics
+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 \helpref{CmpNoCase}{wxstringcmpnocase}, \helpref{IsSameAs}{wxstringissameas}.
Case-insensitive comparison.
Returns a positive value if the string is greater than the argument, zero if
-it si equal to it or negative value if it is less than argument (same semantics
+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 \helpref{Cmp}{wxstringcmp}, \helpref{IsSameAs}{wxstringissameas}.
\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.
\membersection{wxString::First}\label{wxstringfirst}
-\func{size\_t}{First}{\param{char}{ c}}
+\func{int}{First}{\param{char}{ c}}
-\constfunc{size\_t}{First}{\param{const char*}{ psz}}
+\constfunc{int}{First}{\param{const char*}{ psz}}
-\constfunc{size\_t}{First}{\param{const wxString\&}{ str}}
+\constfunc{int}{First}{\param{const wxString\&}{ str}}
-\constfunc{size\_t}{First}{\param{const char}{ ch}}
-
-Returns the first occurrence of the item.
+Same as \helpref{Find}{wxstringfind}.
\membersection{wxString::Format}\label{wxstringformat}
\membersection{wxString::Freq}\label{wxstringfreq}
-\constfunc{int}{Frec}{\param{char }{ch}}
+\constfunc{int}{Freq}{\param{char }{ch}}
-Returns the number of occurences of {it ch} in the string.
+Returns the number of occurrences of {\it ch} in the string.
\membersection{wxString::GetChar}\label{wxstringgetchar}
\membersection{wxString::GetWriteBuf}\label{wxstringgetwritebuf}
-\func{char*}{GetWriteBuf}{\param{size\_t}{ 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}
-\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}}
+\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 {\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.
+Returns the index of the first item matched, or wxNOT\_FOUND.
% TODO
%\membersection{wxString::insert}\label{wxstringinsert}
\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}
\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}
\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.
+Returns true if strings are equal, false otherwise.
See also \helpref{Cmp}{wxstringcmp}, \helpref{CmpNoCase}{wxstringcmpnocase}, \helpref{IsSameAs}{wxstringissameas2}
\membersection{wxString::IsSameAs}\label{wxstringissameas2}
-\constfunc{bool}{IsSameAs}{\param{char}{ c}, \param{bool}{ caseSensitive = TRUE}}
+\constfunc{bool}{IsSameAs}{\param{char}{ c}, \param{bool}{ caseSensitive = true}}
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.
+case-sensitive if {\it caseSensitive} is true (default) or not if it is false.
-Returns TRUE if the string is equal to the character, FALSE otherwise.
+Returns true if the string is equal to the character, false otherwise.
See also \helpref{Cmp}{wxstringcmp}, \helpref{CmpNoCase}{wxstringcmpnocase}, \helpref{IsSameAs}{wxstringissameas}
\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}
\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}
\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}
\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::Mid}\label{wxstringmid}
\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).
\membersection{wxString::Replace}\label{wxstringreplace}
-\func{size\_t}{Replace}{\param{const char*}{ szOld}, \param{const char*}{ szNew}, \param{bool}{ replaceAll = TRUE}}
+\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.
The same as Printf.
+\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}
\membersection{wxString::SubString}\label{wxstringsubstring}
-\constfunc{wxString}{SubString}{\param{size\_t}{ to}, \param{size\_t}{ from}}
+\constfunc{wxString}{SubString}{\param{size\_t}{ from}, \param{size\_t}{ to}}
+
+Deprecated, use \helpref{Mid}{wxstringmid} instead (but note that parameters
+have different meaning).
-Same as \helpref{Mid}{wxstringmid}.
+Returns the part of the string between the indices {\it from} and {\it to}
+inclusive.
\membersection{wxString::ToDouble}\label{wxstringtodouble}
-\constfunc{bool}{To}{\param{double}{ *val}}
+\constfunc{bool}{ToDouble}{\param{double}{ *val}}
-Attempts to convert the string to a floating point number. Returns TRUE on
-suceess (the number is stored in the location pointed to by {\it val}) or FALSE
+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}{To}{\param{long}{ *val}}
+\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}
-Attempts to convert the string to a signed integer. Returns TRUE on suceess
-(the number is stored in the location pointed to by {\it val}) or FALSE if the
-string does not represent such number.
+\helpref{wxString::ToDouble}{wxstringtodouble},\\
+\helpref{wxString::ToULong}{wxstringtoulong}
\membersection{wxString::ToULong}\label{wxstringtoulong}
-\constfunc{bool}{To}{\param{unsigned long}{ *val}}
+\constfunc{bool}{ToULong}{\param{unsigned long}{ *val}, \param{int }{base = $10$}}
-Attempts to convert the string to an unsigned integer. Returns TRUE on suceess
-(the number is stored in the location pointed to by {\it val}) or FALSE if the
-string does not represent such number.
+Attempts to convert the string to a ansigned 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).
\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.
+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}
\constfunc{bool}{operator!}{\void}
-Empty string is FALSE, so !string will only return TRUE if the string is empty.
+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 emptyness
of the string to look the same in the code and makes it easier to port old code
to wxString.
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: all these operators return a new strign equal to the sum of the
operands.
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 to forget 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}
+
+\wxheading{Derived from}
+
+None
+
+\wxheading{Include files}
+
+<wx/string.h>
+
+\latexignore{\rtfignore{\wxheading{Members}}}
+
+\membersection{wxStringBuffer::wxStringBuffer}
+
+\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}}
+
+\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 *}
+
+\constfunc{wxChar *}{operator wxChar *}{\void}
+
+Returns the writable pointer to a buffer of the size at least equal to the
+length specified in the constructor.
+
+
projects / wxWidgets.git / blobdiff