removed unused variable

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

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% ../include/wx/strconv.h at 25/Mar/00 10:20:56
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\section{\class{wxMBConv}}\label{wxmbconv}

This class is the base class of a hierarchy of classes capable of converting
text strings between multibyte (SBCS or DBCS) encodings and Unicode. It is itself
a wrapper around the standard libc mbstowcs() and wcstombs() routines, and has
one predefined instance, {\bf wxConvLibc}.

\wxheading{Derived from}

No base class

\wxheading{Include files}

<wx/strconv.h>

\wxheading{See also}

\helpref{wxCSConv}{wxcsconv}, 
\helpref{wxEncodingConverter}{wxencodingconverter}, 
\helpref{wxMBConv classes overview}{mbconvclasses}

\latexignore{\rtfignore{\wxheading{Members}}}


\membersection{wxMBConv::wxMBConv}\label{wxmbconvwxmbconv}

\func{}{wxMBConv}{\void}

Constructor.

\membersection{wxMBConv::MB2WC}\label{wxmbconvmb2wc}

\constfunc{virtual size\_t}{MB2WC}{\param{wchar\_t* }{buf}, \param{const char* }{psz}, \param{size\_t }{n}}

Converts from a string {\it psz} in multibyte encoding to Unicode putting the
output into the buffer {\it buf} of the size {\it n} (in wide characters, not
bytes). If {\it buf} is {\tt NULL}, nothing is written to it but 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} buffer, the {\it n} parameter should be the size of the buffer
and so it {\bf should} take into account the trailing NUL.

\wxheading{Parameters}

\docparam{buf}{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{n}{the size of the output buffer, ignored if {\it buf} is {\tt NULL}}

\wxheading{Return value}

The length of the converted string.

\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. 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}

\constfunc{const wxWCharBuffer}{cMB2WC}{\param{const char* }{psz}}

Converts from multibyte encoding to Unicode by calling MB2WC,
allocating a temporary wxWCharBuffer to hold the result.

\membersection{wxMBConv::cWC2MB}\label{wxmbconvcwc2mb}

\constfunc{const wxCharBuffer}{cWC2MB}{\param{const wchar\_t* }{psz}}

Converts from Unicode to multibyte encoding by calling WC2MB,
allocating a temporary wxCharBuffer to hold the result.

\membersection{wxMBConv::cMB2WX}\label{wxmbconvcmb2wx}

\constfunc{const char*}{cMB2WX}{\param{const char* }{psz}}

\constfunc{const wxWCharBuffer}{cMB2WX}{\param{const char* }{psz}}

Converts from multibyte encoding to the current wxChar type
(which depends on whether wxUSE\_UNICODE is set to 1). If wxChar is char,
it returns the parameter unaltered. If wxChar is wchar\_t, it returns the
result in a wxWCharBuffer. The macro wxMB2WXbuf is defined as the correct
return type (without const).

\membersection{wxMBConv::cWX2MB}\label{wxmbconvcwx2mb}

\constfunc{const char*}{cWX2MB}{\param{const wxChar* }{psz}}

\constfunc{const wxCharBuffer}{cWX2MB}{\param{const wxChar* }{psz}}

Converts from the current wxChar type to multibyte encoding. If wxChar is char,
it returns the parameter unaltered. If wxChar is wchar\_t, it returns the
result in a wxCharBuffer. The macro wxWX2MBbuf is defined as the correct
return type (without const).

\membersection{wxMBConv::cWC2WX}\label{wxmbconvcwc2wx}

\constfunc{const wchar\_t*}{cWC2WX}{\param{const wchar\_t* }{psz}}

\constfunc{const wxCharBuffer}{cWC2WX}{\param{const wchar\_t* }{psz}}

Converts from Unicode to the current wxChar type. If wxChar is wchar\_t,
it returns the parameter unaltered. If wxChar is char, it returns the
result in a wxCharBuffer. The macro wxWC2WXbuf is defined as the correct
return type (without const).

\membersection{wxMBConv::cWX2WC}\label{wxmbconvcwx2wc}

\constfunc{const wchar\_t*}{cWX2WC}{\param{const wxChar* }{psz}}

\constfunc{const wxWCharBuffer}{cWX2WC}{\param{const wxChar* }{psz}}

Converts from the current wxChar type to Unicode. If wxChar is wchar\_t,
it returns the parameter unaltered. If wxChar is char, it returns the
result in a wxWCharBuffer. The macro wxWX2WCbuf is defined as the correct
return type (without const).