docs/latex/wx/fltfactory.tex

   1 %
   2 % automatically generated by HelpGen $Revision$ from
   3 % include/wx/stream.h at 28/Oct/06 18:49:10
   4 %
   5
   6 \section{\class{wxFilterClassFactory}}\label{wxfilterclassfactory}
   7
   8 Allows the creation of filter streams to handle compression formats such
   9 as gzip and bzip2.
  10
  11 For example, given a filename you can search for a factory that will
  12 handle it and create a stream to decompress it:
  13
  14 \begin{verbatim}
  15     factory = wxFilterClassFactory::Find(filename, wxSTREAM_FILEEXT);
  16     if (factory)
  17         stream = factory->NewStream(new wxFFileInputStream(filename));
  18 \end{verbatim}
  19
  20 \helpref{Find()}{wxfilterclassfactoryfind} can also search
  21 for a factory by MIME type, HTTP encoding or by wxFileSystem protocol.
  22 The available factories can be enumerated
  23 using \helpref{GetFirst() and GetNext()}{wxfilterclassfactorygetfirst}.
  24
  25 \wxheading{Derived from}
  26
  27 \helpref{wxObject}{wxobject}
  28
  29 \wxheading{Include files}
  30
  31 <wx/stream.h>
  32
  33 \wxheading{Data structures}
  34
  35 \begin{verbatim}
  36 enum wxStreamProtocolType
  37 {
  38     wxSTREAM_PROTOCOL,  // wxFileSystem protocol (should be only one)
  39     wxSTREAM_MIMETYPE,  // MIME types the stream handles
  40     wxSTREAM_ENCODING,  // The HTTP Content-Encodings the stream handles
  41     wxSTREAM_FILEEXT    // File extensions the stream handles
  42 };
  43
  44 \end{verbatim}
  45
  46 \wxheading{See also}
  47
  48 \helpref{wxFilterInputStream}{wxfilterinputstream}\\
  49 \helpref{wxFilterOutputStream}{wxfilteroutputstream}\\
  50 \helpref{wxArchiveClassFactory}{wxarchiveclassfactory}\\
  51 \helpref{Archive formats such as zip}{wxarc}
  52
  53 \latexignore{\rtfignore{\wxheading{Members}}}
  54
  55
  56 \membersection{wxFilterClassFactory::CanHandle}\label{wxfilterclassfactorycanhandle}
  57
  58 \constfunc{bool}{CanHandle}{\param{const wxChar* }{protocol}, \param{wxStreamProtocolType }{type = wxSTREAM\_PROTOCOL}}
  59
  60 Returns true if this factory can handle the given protocol, MIME type, HTTP
  61 encoding or file extension.
  62
  63 When using wxSTREAM\_FILEEXT for the second parameter, the first parameter
  64 can be a complete filename rather than just an extension.
  65
  66
  67 \membersection{wxFilterClassFactory::Find}\label{wxfilterclassfactoryfind}
  68
  69 \func{static const wxFilterClassFactory*}{Find}{\param{const wxChar* }{protocol}, \param{wxStreamProtocolType }{type = wxSTREAM\_PROTOCOL}}
  70
  71 A static member that finds a factory that can handle a given protocol, MIME
  72 type, HTTP encoding or file extension.  Returns a pointer to the class
  73 factory if found, or NULL otherwise. It does not give away ownership of the
  74 factory.
  75
  76 When using wxSTREAM\_FILEEXT for the second parameter, the first parameter
  77 can be a complete filename rather than just an extension.
  78
  79
  80 \membersection{wxFilterClassFactory::GetFirst/GetNext}\label{wxfilterclassfactorygetfirst}
  81
  82 \func{static const wxFilterClassFactory*}{GetFirst}{\void}
  83
  84 \constfunc{const wxFilterClassFactory*}{GetNext}{\void}
  85
  86 GetFirst and GetNext can be used to enumerate the available factories.
  87
  88 For example, to list them:
  89
  90 \begin{verbatim}
  91     wxString list;
  92     const wxFilterClassFactory *factory = wxFilterClassFactory::GetFirst();
  93
  94     while (factory) {
  95         list << factory->GetProtocol() << _T("\n");
  96         factory = factory->GetNext();
  97     }
  98
  99 \end{verbatim}
 100
 101 GetFirst()/GetNext() return a pointer to a factory or NULL if no more
 102 are available. They do not give away ownership of the factory.
 103
 104
 105 \membersection{wxFilterClassFactory::GetProtocol}\label{wxfilterclassfactorygetprotocol}
 106
 107 \constfunc{wxString}{GetProtocol}{\void}
 108
 109 Returns the wxFileSystem protocol supported by this factory. Equivalent
 110 to wxString(*GetProtcols()).
 111
 112
 113 \membersection{wxFilterClassFactory::GetProtocols}\label{wxfilterclassfactorygetprotocols}
 114
 115 \constfunc{const wxChar * const*}{GetProtocols}{\param{wxStreamProtocolType }{type = wxSTREAM\_PROTOCOL}}
 116
 117 Returns the protocols, MIME types, HTTP encodings or file extensions
 118 supported by this factory, as an array of null terminated strings. It does
 119 not give away ownership of the array or strings.
 120
 121 For example, to list the file extensions a factory supports:
 122
 123 \begin{verbatim}
 124     wxString list;
 125     const wxChar *const *p;
 126
 127     for (p = factory->GetProtocols(wxSTREAM_FILEEXT); *p; p++)
 128         list << *p << _T("\n");
 129
 130 \end{verbatim}
 131
 132
 133 \membersection{wxFilterClassFactory::NewStream}\label{wxfilterclassfactorynewstream}
 134
 135 \constfunc{wxFilterInputStream*}{NewStream}{\param{wxInputStream\& }{stream}}
 136
 137 \constfunc{wxFilterOutputStream*}{NewStream}{\param{wxOutputStream\& }{stream}}
 138
 139 \constfunc{wxFilterInputStream*}{NewStream}{\param{wxInputStream* }{stream}}
 140
 141 \constfunc{wxFilterOutputStream*}{NewStream}{\param{wxOutputStream* }{stream}}
 142
 143 Create a new input or output stream to decompress or compress a given stream.
 144
 145 If the parent stream is passed as a pointer then the new filter stream
 146 takes ownership of it. If it is passed by reference then it does not.
 147
 148
 149 \membersection{wxFilterClassFactory::PopExtension}\label{wxfilterclassfactorypopextension}
 150
 151 \constfunc{wxString}{PopExtension}{\param{const wxString\& }{location}}
 152
 153 Remove the file extension of {\it location} if it is one of the file
 154 extensions handled by this factory.
 155
 156
 157 \membersection{wxFilterClassFactory::PushFront}\label{wxfilterclassfactorypushfront}
 158
 159 \func{void}{PushFront}{\void}
 160
 161 Adds this class factory to the list returned
 162 by \helpref{GetFirst()/GetNext()}{wxfilterclassfactorygetfirst}.
 163
 164 It is not necessary to do this to use the filter streams. It is usually
 165 used when implementing streams, typically the implementation will
 166 add a static instance of its factory class.
 167
 168 It can also be used to change the order of a factory already in the list,
 169 bringing it to the front. This isn't a thread safe operation
 170 so can't be done when other threads are running that will be using the list.
 171
 172 The list does not take ownership of the factory.
 173
 174
 175 \membersection{wxFilterClassFactory::Remove}\label{wxfilterclassfactoryremove}
 176
 177 \func{void}{Remove}{\void}
 178
 179 Removes this class factory from the list returned
 180 by \helpref{GetFirst()/GetNext()}{wxfilterclassfactorygetfirst}.
 181
 182 Removing from the list isn't a thread safe operation
 183 so can't be done when other threads are running that will be using the list.
 184
 185 The list does not own the factories, so removing a factory does not delete it.
 186