docs/latex/wx/mimetype.tex

   1 \section{\class{wxMimeTypesManager}}\label{wxmimetypesmanager}
   2
   3 This class allows the application to retrieve the information about all known
   4 MIME types from a system-specific location and the filename extensions to the
   5 MIME types and vice versa. After initialization the functions
   6 \helpref{wxMimeTypesManager::GetFileTypeFromMimeType}{wxmimetypesmanagergetfiletypefrommimetype}
   7 and \helpref{wxMimeTypesManager::GetFileTypeFromExtension}{wxmimetypesmanagergetfiletypefromextension}
   8 may be called: they will return a \helpref{wxFileType}{wxfiletype} object which
   9 may be further queried for file description, icon and other attributes.
  10
  11 {\bf Windows:} MIME type information is stored in the registry and no additional
  12 initialization is needed.
  13
  14 {\bf Unix:} MIME type information is stored in the files mailcap and mime.types
  15 (system-wide) and .mailcap and .mime.types in the current user's home directory:
  16 all of these files are searched for and loaded if found by default. However,
  17 additional functions
  18 \helpref{wxMimeTypesManager::ReadMailcap}{wxmimetypesmanagerreadmailcap} and
  19 \helpref{wxMimeTypesManager::ReadMimeTypes}{wxmimetypesmanagerreadmimetypes} are
  20 provided to load additional files.
  21
  22 If GNOME or KDE desktop environment is installed, then wxMimeTypesManager
  23 gathers MIME information from respective files (e.g. .kdelnk files under KDE).
  24
  25 NB: Currently, wxMimeTypesManager is limited to reading MIME type information
  26 but it will support modifying it as well in future versions.
  27
  28 \wxheading{Global objects}
  29
  30 Global instance of wxMimeTypesManager is always available. It is defined
  31 as follows:
  32
  33 \begin{verbatim}
  34 wxMimeTypesManager *wxTheMimeTypesManager;
  35 \end{verbatim}
  36
  37 It is recommended to use this instance instead of creating your own because
  38 gathering MIME information may take quite a long time on Unix systems.
  39
  40 \wxheading{Derived from}
  41
  42 No base class.
  43
  44 \wxheading{Include files}
  45
  46 <wx/mimetype.h>
  47
  48 \wxheading{See also}
  49
  50 \helpref{wxFileType}{wxfiletype}
  51
  52 \latexignore{\rtfignore{\wxheading{Function groups}}}
  53
  54 \membersection{Helper functions}\label{mimehelperfunctions}
  55
  56 All of these functions are static (i.e. don't need a wxMimeTypesManager object
  57 to call them) and provide some useful operations for string representations of
  58 MIME types. Their usage is recommended instead of directly working with MIME
  59 types using wxString functions.
  60
  61 \helpref{IsOfType}{wxmimetypesmanagerisoftype}
  62
  63 \membersection{Constructor and destructor}\label{mimeconstructordestructor}
  64
  65 NB: You won't normally need to use more than one wxMimeTypesManager object in a
  66 program.
  67
  68 \helpref{wxMimeTypesManager}{wxmimetypesmanagerctor}\\
  69 \helpref{\destruct{wxMimeTypesManager}}{wxmimetypesmanagerdtor}
  70
  71 \membersection{Query database}\label{mimequerydatabase}
  72
  73 These functions are the heart of this class: they allow to find a \helpref{file type}{wxfiletype} object
  74 from either file extension or MIME type.
  75 If the function is successful, it returns a pointer to the wxFileType object
  76 which {\bf must} be deleted by the caller, otherwise NULL will be returned.
  77
  78 \helpref{GetFileTypeFromMimeType}{wxmimetypesmanagergetfiletypefrommimetype}\\
  79 \helpref{GetFileTypeFromExtension}{wxmimetypesmanagergetfiletypefromextension}
  80
  81 \membersection{Initialization functions}\label{wxmimetypesmanagerinit}
  82
  83 {\bf Unix:} These functions may be used to load additional files (except for the
  84 default ones which are loaded automatically) containing MIME
  85 information in either mailcap(5) or mime.types(5) format.
  86
  87 \helpref{ReadMailcap}{wxmimetypesmanagerreadmailcap}\\
  88 \helpref{ReadMimeTypes}{wxmimetypesmanagerreadmimetypes}\\
  89 \helpref{AddFallbacks}{wxmimetypesmanageraddfallbacks}
  90
  91 %%%%% MEMBERS HERE %%%%%
  92 \helponly{\insertatlevel{2}{
  93
  94 \wxheading{Members}
  95
  96 }}
  97
  98 \membersection{wxMimeTypesManager::wxMimeTypesManager}\label{wxmimetypesmanagerctor}
  99
 100 \func{}{wxMimeTypesManager}{\void}
 101
 102 Constructor puts the object in the "working" state, no additional initialization
 103 are needed - but \helpref{ReadXXX}{wxmimetypesmanagerinit} may be used to load
 104 additional mailcap/mime.types files.
 105
 106 \membersection{wxMimeTypesManager::\destruct{wxMimeTypesManager}}\label{wxmimetypesmanagerdtor}
 107
 108 \func{}{\destruct{wxMimeTypesManager}}{\void}
 109
 110 Destructor is not virtual, so this class should not be derived from.
 111
 112 \membersection{wxMimeTypesManager::AddFallbacks}\label{wxmimetypesmanageraddfallbacks}
 113
 114 \func{void}{AddFallbacks}{\param{const wxFileTypeInfo *}{fallbacks}}
 115
 116 This function may be used to provide hard-wired fallbacks for the MIME types
 117 and extensions that might not be present in the system MIME database.
 118
 119 % TODO
 120
 121 Please see the typetest sample for an example of using it.
 122
 123 \membersection{wxMimeTypesManager::GetFileTypeFromExtension}\label{wxmimetypesmanagergetfiletypefromextension}
 124
 125 \func{wxFileType*}{GetFileTypeFromExtension}{\param{const wxString\&}{ extension}}
 126
 127 Gather information about the files with given extension and return the
 128 corresponding \helpref{wxFileType}{wxfiletype} object or NULL if the extension
 129 is unknown.
 130
 131 \membersection{wxMimeTypesManager::GetFileTypeFromMimeType}\label{wxmimetypesmanagergetfiletypefrommimetype}
 132
 133 \func{wxFileType*}{GetFileTypeFromMimeType}{\param{const wxString\&}{ mimeType}}
 134
 135 Gather information about the files with given MIME type and return the
 136 corresponding \helpref{wxFileType}{wxfiletype} object or NULL if the MIME type
 137 is unknown.
 138
 139 \membersection{wxMimeTypesManager::IsOfType}\label{wxmimetypesmanagerisoftype}
 140
 141 \func{bool}{IsOfType}{\param{const wxString\&}{ mimeType}, \param{const wxString\&}{ wildcard}}
 142
 143 This function returns true if either the given {\it mimeType} is exactly the
 144 same as {\it wildcard} or if it has the same category and the subtype of
 145 {\it wildcard} is '*'. Note that the '*' wildcard is not allowed in
 146 {\it mimeType} itself.
 147
 148 The comparison don by this function is case insensitive so it is not
 149 necessary to convert the strings to the same case before calling it.
 150
 151 \membersection{wxMimeTypesManager::ReadMailcap}\label{wxmimetypesmanagerreadmailcap}
 152
 153 \func{bool}{ReadMailcap}{\param{const wxString\&}{ filename}, \param{bool}{ fallback = false}}
 154
 155 Load additional file containing information about MIME types and associated
 156 information in mailcap format. See metamail(1) and mailcap(5) for more
 157 information.
 158
 159 {\it fallback} parameter may be used to load additional mailcap files without
 160 overriding the settings found in the standard files: normally, entries from
 161 files loaded with ReadMailcap will override the entries from files loaded
 162 previously (and the standard ones are loaded in the very beginning), but this
 163 will not happen if this parameter is set to true (default is false).
 164
 165 The return value is true if there were no errors in the file or false
 166 otherwise.
 167
 168 \membersection{wxMimeTypesManager::ReadMimeTypes}\label{wxmimetypesmanagerreadmimetypes}
 169
 170 \func{bool}{ReadMimeTypes}{\param{const wxString\&}{ filename}}
 171
 172 Load additional file containing information about MIME types and associated
 173 information in mime.types file format. See metamail(1) and mailcap(5) for more
 174 information.
 175
 176 The return value is true if there were no errors in the file or false
 177 otherwise.
 178