\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.
\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 comparaison as you would also have to precalculate the
+doing direct string comparison as you would also have to precalculate the
length of the prefix then.
\helpref{Cmp}{wxstringcmp}\\
\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}\\
\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
// 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;
\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}
\membersection{wxString::Index}\label{wxstringindex}
-\constfunc{size\_t}{Index}{\param{char}{ ch}, \param{int}{ startpos = 0}}
+\constfunc{size\_t}{Index}{\param{char}{ ch}}
Same as \helpref{wxString::Find}{wxstringfind}.
\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 positive or negative integer. Will return FALSE for decimals.
+Returns TRUE if the string is an integer (with possible sign).
\membersection{wxString::IsSameAs}\label{wxstringissameas}
\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}
\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.
\constfunc{wxString}{SubString}{\param{size\_t}{ from}, \param{size\_t}{ to}}
-Same as \helpref{Mid}{wxstringmid}.
+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::ToDouble}\label{wxstringtodouble}
\membersection{wxString::ToLong}\label{wxstringtolong}
-\constfunc{bool}{ToLong}{\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.
-Attempts to convert the string to a signed integer. 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.
+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}
\membersection{wxString::ToULong}\label{wxstringtoulong}
-\constfunc{bool}{ToULong}{\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 success
-(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}
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