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[wxWidgets.git] / docs / latex / wx / mbconv.tex

diff --git a/docs/latex/wx/mbconv.tex b/docs/latex/wx/mbconv.tex
index 5aaf60b65c74ed43305ed0f88471bb311c000b97..3d5e4a07b4210a5aba9600dd4ffa14583df39171 100644 (file)
--- a/docs/latex/wx/mbconv.tex
+++ b/docs/latex/wx/mbconv.tex
@@ -35,17 +35,43 @@ Constructor.
 
 \membersection{wxMBConv::MB2WC}\label{wxmbconvmb2wc}
 
-\constfunc{virtual size\_t}{MB2WC}{\param{wchar\_t* }{buf}, \param{const char* }{psz}, \param{size\_t }{n}}
+\constfunc{virtual size\_t}{MB2WC}{\param{wchar\_t *}{outputBuf}, \param{const char *}{psz}, \param{size\_t }{outputSize}}
 
-Converts from multibyte encoding to Unicode, using the libc routine mbstowcs()
-(this is overridden by derived classes). Returns the size of the destination buffer.
+Converts from a string {\it psz} in multibyte encoding to Unicode putting the
+output into the buffer {\it outputBuf} of the maximum size {\it outputSize} (in wide
+characters, not bytes). If {\it outputBuf} is {\tt NULL}, only the length of the
+string which would result from the conversion is calculated and returned.
+Note that this is the length and not size, i.e. the returned value does 
+{\bf not} include the trailing NUL. But when the function is called with a
+non-{\tt NULL} {\it outputBuf}, the {\it outputSize} parameter should be the size of the buffer
+and so it {\bf should} take into account the trailing NUL.
+
+\wxheading{Parameters}
+
+\docparam{outputBuf}{the output buffer, may be {\tt NULL} if the caller is only
+interested in the length of the resulting string}
+
+\docparam{psz}{the {\tt NUL}-terminated input string, cannot be {\tt NULL}}
+
+\docparam{outputSize}{the size of the output buffer (in wide characters, {\bf including} the
+NUL) , ignored if {\it outputBuf} is {\tt NULL}}
+
+\wxheading{Return value}
+
+The length of the converted string (in wide characters, {\bf excluding} the NUL)
 
 \membersection{wxMBConv::WC2MB}\label{wxmbconvwc2mb}
 
 \constfunc{virtual size\_t}{WC2MB}{\param{char* }{buf}, \param{const wchar\_t* }{psz}, \param{size\_t }{n}}
 
-Converts from Unicode to multibyte encoding, using the libc routine wcstombs()
-(this is overridden by derived classes). Returns the size of the destination buffer.
+Converts from Unicode to multibyte encoding. The semantics of this function
+(including the return value meaning) is the same as for 
+\helpref{MB2WC}{wxmbconvmb2wc}.
+
+Notice that when the function is called with a non-{\tt NULL} buffer, the 
+{\it n} parameter should be the size of the buffer and so it {\bf should} take
+into account the trailing NUL, which might take two or four bytes for some
+encodings (UTF-16 and UTF-32).
 
 \membersection{wxMBConv::cMB2WC}\label{wxmbconvcmb2wc}