a7af285d1a
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@47777 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
204 lines
7.2 KiB
TeX
204 lines
7.2 KiB
TeX
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% automatically generated by HelpGen from
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% encconv.h at 30/Dec/99 18:45:16
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\section{\class{wxEncodingConverter}}\label{wxencodingconverter}
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This class is capable of converting strings between two
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8-bit encodings/charsets. It can also convert from/to Unicode (but only
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if you compiled wxWidgets with wxUSE\_WCHAR\_T set to 1). Only a limited subset
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of encodings is supported by wxEncodingConverter:
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{\tt wxFONTENCODING\_ISO8859\_1..15}, {\tt wxFONTENCODING\_CP1250..1257} and
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{\tt wxFONTENCODING\_KOI8}.
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\wxheading{Note}
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Please use \helpref{wxMBConv classes}{mbconvclasses} instead
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if possible. \helpref{wxCSConv}{wxcsconv} has much better support for various
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encodings than wxEncodingConverter. wxEncodingConverter is useful only
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if you rely on {\tt wxCONVERT\_SUBSTITUTE} mode of operation (see
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\helpref{Init}{wxencodingconverterinit}).
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\wxheading{Derived from}
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\helpref{wxObject}{wxobject}
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\wxheading{Include files}
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<wx/encconv.h>
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\wxheading{Library}
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\helpref{wxBase}{librarieslist}
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\wxheading{See also}
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\helpref{wxFontMapper}{wxfontmapper},
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\helpref{wxMBConv}{wxmbconv},
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\helpref{Writing non-English applications}{nonenglishoverview}
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\latexignore{\rtfignore{\wxheading{Members}}}
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\membersection{wxEncodingConverter::wxEncodingConverter}\label{wxencodingconverterwxencodingconverter}
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\func{}{wxEncodingConverter}{\void}
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Constructor.
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\membersection{wxEncodingConverter::Init}\label{wxencodingconverterinit}
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\func{bool}{Init}{\param{wxFontEncoding }{input\_enc}, \param{wxFontEncoding }{output\_enc}, \param{int }{method = wxCONVERT\_STRICT}}
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Initialize conversion. Both output or input encoding may
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be wxFONTENCODING\_UNICODE, but only if wxUSE\_ENCODING is set to 1.
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All subsequent calls to \helpref{Convert()}{wxencodingconverterconvert}
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will interpret its argument
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as a string in {\it input\_enc} encoding and will output string in
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{\it output\_enc} encoding.
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You must call this method before calling Convert. You may call
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it more than once in order to switch to another conversion.
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{\it Method} affects behaviour of Convert() in case input character
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cannot be converted because it does not exist in output encoding:
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\begin{twocollist}\itemsep=0pt
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\twocolitem{{\bf wxCONVERT\_STRICT}}{follow behaviour of GNU Recode -
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just copy unconvertible characters to output and don't change them
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(its integer value will stay the same)}
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\twocolitem{{\bf wxCONVERT\_SUBSTITUTE}}{try some (lossy) substitutions
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- e.g. replace unconvertible latin capitals with acute by ordinary
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capitals, replace en-dash or em-dash by '-' etc.}
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\end{twocollist}
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Both modes guarantee that output string will have same length
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as input string.
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\wxheading{Return value}
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false if given conversion is impossible, true otherwise
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(conversion may be impossible either if you try to convert
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to Unicode with non-Unicode build of wxWidgets or if input
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or output encoding is not supported.)
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\membersection{wxEncodingConverter::CanConvert}\label{wxencodingconvertercanconvert}
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\func{static bool}{CanConvert}{\param{wxFontEncoding }{encIn}, \param{wxFontEncoding }{encOut}}
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Return true if (any text in) multibyte encoding \arg{encIn} can be converted to
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another one ({\it encOut}) losslessly.
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Do not call this method with \texttt{wxFONTENCODING\_UNICODE} as either
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parameter, it doesn't make sense (always works in one sense and always depends
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on the text to convert in the other).
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\membersection{wxEncodingConverter::Convert}\label{wxencodingconverterconvert}
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\constfunc{bool}{Convert}{\param{const char* }{input}, \param{char* }{output}}
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\constfunc{bool}{Convert}{\param{const wchar\_t* }{input}, \param{wchar\_t* }{output}}
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\constfunc{bool}{Convert}{\param{const char* }{input}, \param{wchar\_t* }{output}}
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\constfunc{bool}{Convert}{\param{const wchar\_t* }{input}, \param{char* }{output}}
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Convert input string according to settings passed to
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\helpref{Init}{wxencodingconverterinit} and writes the result to {\it output}.
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\constfunc{bool}{Convert}{\param{char* }{str}}
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\constfunc{bool}{Convert}{\param{wchar\_t* }{str}}
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Convert input string according to settings passed to
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\helpref{Init}{wxencodingconverterinit} in-place, i.e. write the result to the
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same memory area.
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All of the versions above return \true if the conversion was lossless and
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\false if at least one of the characters couldn't be converted and was replaced
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with {\tt '?'} in the output. Note that if {\tt wxCONVERT\_SUBSTITUTE} was
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passed to \helpref{Init}{wxencodingconverterinit}, substitution is considered
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lossless operation.
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\constfunc{wxString}{Convert}{\param{const wxString\& }{input}}
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Convert wxString and return new wxString object.
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\wxheading{Notes}
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You must call \helpref{Init}{wxencodingconverterinit} before using this method!
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{\tt wchar\_t} versions of the method are not available if wxWidgets was compiled
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with {\tt wxUSE\_WCHAR\_T} set to 0.
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\membersection{wxEncodingConverter::GetPlatformEquivalents}\label{wxencodingconvertergetplatformequivalents}
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\func{static wxFontEncodingArray}{GetPlatformEquivalents}{\param{wxFontEncoding }{enc}, \param{int }{platform = wxPLATFORM\_CURRENT}}
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Return equivalents for given font that are used
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under given platform. Supported platforms:
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\begin{itemize}\itemsep=0pt
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\item wxPLATFORM\_UNIX
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\item wxPLATFORM\_WINDOWS
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\item wxPLATFORM\_OS2
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\item wxPLATFORM\_MAC
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\item wxPLATFORM\_CURRENT
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\end{itemize}
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wxPLATFORM\_CURRENT means the platform this binary was compiled for.
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Examples:
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\begin{verbatim}
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current platform enc returned value
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----------------------------------------------
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unix CP1250 {ISO8859_2}
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unix ISO8859_2 {ISO8859_2}
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windows ISO8859_2 {CP1250}
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unix CP1252 {ISO8859_1,ISO8859_15}
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\end{verbatim}
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Equivalence is defined in terms of convertibility:
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two encodings are equivalent if you can convert text between
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then without losing information (it may - and will - happen
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that you lose special chars like quotation marks or em-dashes
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but you shouldn't lose any diacritics and language-specific
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characters when converting between equivalent encodings).
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Remember that this function does {\bf NOT} check for presence of
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fonts in system. It only tells you what are most suitable
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encodings. (It usually returns only one encoding.)
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\wxheading{Notes}
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\begin{itemize}\itemsep=0pt
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\item Note that argument {\it enc} itself may be present in the returned array,
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so that you can, as a side-effect, detect whether the
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encoding is native for this platform or not.
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\item \helpref{Convert}{wxencodingconverterconvert} is not limited to
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converting between equivalent encodings, it can convert between two arbitrary
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encodings.
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\item If {\it enc} is present in the returned array, then it is {\bf always} the first
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item of it.
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\item Please note that the returned array may contain no items at all.
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\end{itemize}
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\membersection{wxEncodingConverter::GetAllEquivalents}\label{wxencodingconvertergetallequivalents}
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\func{static wxFontEncodingArray}{GetAllEquivalents}{\param{wxFontEncoding }{enc}}
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Similar to
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\helpref{GetPlatformEquivalents}{wxencodingconvertergetplatformequivalents},
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but this one will return ALL
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equivalent encodings, regardless of the platform, and including itself.
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This platform's encodings are before others in the array. And again, if {\it enc} is in the array,
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it is the very first item in it.
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