docs/latex/wx/dynlib.tex

   1 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   2 %% Name:        dynlib.tex
   3 %% Purpose:     wxDynamicLibrary and wxDynamicLibraryDetails documentation
   4 %% Author:      Vadim Zeitlin
   5 %% Modified by:
   6 %% Created:     14.01.02 (extracted from dllload.tex)
   7 %% RCS-ID:      $Id$
   8 %% Copyright:   (c) Vadim Zeitlin
   9 %% License:     wxWindows license
  10 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  11
  12 \section{\class{wxDynamicLibrary}}\label{wxdynamiclibrary}
  13
  14 wxDynamicLibrary is a class representing dynamically loadable library
  15 (Windows DLL, shared library under Unix etc.). Just create an object of
  16 this class to load a library and don't worry about unloading it -- it will be
  17 done in the objects destructor automatically.
  18
  19 % deprecated now...
  20 %
  21 %\wxheading{See also}
  22 %
  23 %\helpref{wxDllLoader}{wxdllloader}
  24
  25 \wxheading{Derived from}
  26
  27 No base class.
  28
  29 \wxheading{Include files}
  30
  31 <wx/dynlib.h>
  32
  33 (only available if \texttt{wxUSE\_DYNLIB\_CLASS} is set to $1$)
  34
  35 \latexignore{\rtfignore{\wxheading{Members}}}
  36
  37 \membersection{wxDynamicLibrary::wxDynamicLibrary}\label{wxdynamiclibrarywxdynamiclibrary}
  38
  39 \func{}{wxDynamicLibrary}{\void}
  40
  41 \func{}{wxDynamicLibrary}{\param{const wxString\& }{name}, \param{int }{flags = wxDL\_DEFAULT}}
  42
  43 Constructor. Second form calls \helpref{Load}{wxdynamiclibraryload}.
  44
  45
  46 \membersection{wxDynamicLibrary::CanonicalizeName}\label{wxdynamiclibrarycanonicalizename}
  47
  48 \func{wxString}{CanonicalizeName}{\param{const wxString\& }{name}, \param{wxDynamicLibraryCategory}{ cat = wxDL\_LIBRARY}}
  49
  50 Returns the platform-specific full name for the library called \arg{name}. E.g.
  51 it adds a {\tt ".dll"} extension under Windows and {\tt "lib"} prefix and
  52 {\tt ".so"}, {\tt ".sl"} or maybe {\tt ".dylib"} extension under Unix.
  53
  54 The possible values for \arg{cat} are:
  55
  56 \begin{twocollist}
  57     \twocolitem{wxDL\_LIBRARY}{normal library}
  58     \twocolitem{wxDL\_MODULE}{a loadable module or plugin}
  59 \end{twocollist}
  60
  61 \wxheading{See also}
  62
  63 \helpref{CanonicalizePluginName}{wxdynamiclibrarycanonicalizepluginname}
  64
  65
  66
  67 \membersection{wxDynamicLibrary::CanonicalizePluginName}\label{wxdynamiclibrarycanonicalizepluginname}
  68
  69 \func{wxString}{CanonicalizePluginName}{\param{const wxString\& }{name}, \param{wxPluginCategory}{ cat = wxDL\_PLUGIN\_GUI}}
  70
  71 This function does the same thing as
  72 \helpref{CanonicalizeName}{wxdynamiclibrarycanonicalizename} but for wxWidgets
  73 plugins. The only difference is that compiler and version information are added
  74 to the name to ensure that the plugin which is going to be loaded will be
  75 compatible with the main program.
  76
  77 The possible values for \arg{cat} are:
  78
  79 \begin{twocollist}
  80     \twocolitem{wxDL\_PLUGIN\_GUI}{plugin which uses GUI classes (default)}
  81     \twocolitem{wxDL\_PLUGIN\_BASE}{plugin which only uses wxBase}
  82 \end{twocollist}
  83
  84
  85 \membersection{wxDynamicLibrary::Detach}\label{wxdynamiclibrarydetach}
  86
  87 \func{wxDllType}{Detach}{\void}
  88
  89 Detaches this object from its library handle, i.e. the object will not unload
  90 the library any longer in its destructor but it is now the callers
  91 responsibility to do this using \helpref{Unload}{wxdynamiclibraryunload}.
  92
  93
  94 \membersection{wxDynamicLibrary::GetSymbol}\label{wxdynamiclibrarygetsymbol}
  95
  96 \constfunc{void *}{GetSymbol}{\param{const wxString\& }{name}}
  97
  98 Returns pointer to symbol {\it name} in the library or NULL if the library
  99 contains no such symbol.
 100
 101 \wxheading{See also}
 102
 103 \helpref{wxDYNLIB\_FUNCTION}{wxdynlibfunction}
 104
 105
 106 \membersection{wxDynamicLibrary::GetSymbolAorW}\label{wxdynamiclibrarygetsymbolaorw}
 107
 108 \constfunc{void *}{GetSymbolAorW}{\param{const wxString\& }{name}}
 109
 110 This function is available only under Windows as it is only useful when
 111 dynamically loading symbols from standard Windows DLLs. Such functions have
 112 either \texttt{'A'} (in ANSI build) or \texttt{'W'} (in Unicode, or wide
 113 character build) suffix if they take string parameters. Using this function you
 114 can use just the base name of the function and the correct suffix is appende
 115 automatically depending on the current build. Otherwise, this method is
 116 identical to \helpref{GetSymbol}{wxdynamiclibrarygetsymbol}.
 117
 118
 119 \membersection{wxDynamicLibrary::GetProgramHandle}\label{wxdynamiclibrarygetprogramhandle}
 120
 121 \func{static wxDllType}{GetProgramHandle}{\void}
 122
 123 Return a valid handle for the main program itself or \texttt{NULL} if symbols
 124 from the main program can't be loaded on this platform.
 125
 126
 127 \membersection{wxDynamicLibrary::HasSymbol}\label{wxdynamiclibraryhassymbol}
 128
 129 \constfunc{bool}{HasSymbol}{\param{const wxString\& }{name}}
 130
 131 Returns \true if the symbol with the given \arg{name} is present in the dynamic
 132 library, \false otherwise. Unlike \helpref{GetSymbol}{wxdynamiclibrarygetsymbol},
 133 this function doesn't log an error message if the symbol is not found.
 134
 135 \newsince{2.5.4}
 136
 137
 138 \membersection{wxDynamicLibrary::IsLoaded}\label{wxdynamiclibraryisloaded}
 139
 140 \constfunc{bool}{IsLoaded}{\void}
 141
 142 Returns \true if the library was successfully loaded, \false otherwise.
 143
 144
 145 \membersection{wxDynamicLibrary::ListLoaded}\label{wxdynamiclibrarylistloaded}
 146
 147 \func{static wxDynamicLibraryDetailsArray}{ListLoaded}{\void}
 148
 149 This static method returns an \helpref{array}{wxarray} containing the details
 150 of all modules loaded into the address space of the current project, the array
 151 elements are object of \texttt{wxDynamicLibraryDetails} class. The array will
 152 be empty if an error occurred.
 153
 154 This method is currently implemented only under Win32 and Linux and is useful
 155 mostly for diagnostics purposes.
 156
 157
 158 \membersection{wxDynamicLibrary::Load}\label{wxdynamiclibraryload}
 159
 160 \func{bool}{Load}{\param{const wxString\& }{name}, \param{int }{flags = wxDL\_DEFAULT}}
 161
 162 Loads DLL with the given \arg{name} into memory. The \arg{flags} argument can
 163 be a combination of the following bits:
 164
 165 \begin{twocollist}
 166 \twocolitem{wxDL\_LAZY}{equivalent of RTLD\_LAZY under Unix, ignored elsewhere}
 167 \twocolitem{wxDL\_NOW}{equivalent of RTLD\_NOW under Unix, ignored elsewhere}
 168 \twocolitem{wxDL\_GLOBAL}{equivalent of RTLD\_GLOBAL under Unix, ignored elsewhere}
 169 \twocolitem{wxDL\_VERBATIM}{don't try to append the appropriate extension to
 170 the library name (this is done by default).}
 171 \twocolitem{wxDL\_DEFAULT}{default flags, same as wxDL\_NOW currently}
 172 \end{twocollist}
 173
 174 Returns \true if the library was successfully loaded, \false otherwise.
 175
 176
 177 \membersection{wxDynamicLibrary::Unload}\label{wxdynamiclibraryunload}
 178
 179 \func{void}{Unload}{\void}
 180
 181 \func{static void}{Unload}{\param{wxDllType }{handle}}
 182
 183 Unloads the library from memory. wxDynamicLibrary object automatically calls
 184 this method from its destructor if it had been successfully loaded.
 185
 186 The second version is only used if you need to keep the library in memory
 187 during a longer period of time than the scope of the wxDynamicLibrary object.
 188 In this case you may call \helpref{Detach}{wxdynamiclibrarydetach} and store
 189 the handle somewhere and call this static method later to unload it.
 190
 191 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 192
 193 \section{\class{wxDynamicLibraryDetails}}\label{wxdynamiclibrarydetails}
 194
 195 This class is used for the objects returned by
 196 \helpref{wxDynamicLibrary::ListLoaded}{wxdynamiclibrarylistloaded} method and
 197 contains the information about a single module loaded into the address space of
 198 the current process. A module in this context may be either a dynamic library
 199 or the main program itself.
 200
 201 \wxheading{Derived from}
 202
 203 No base class.
 204
 205 \wxheading{Include files}
 206
 207 <wx/dynlib.h>
 208
 209 (only available if \texttt{wxUSE\_DYNLIB\_CLASS} is set to $1$)
 210
 211 \latexignore{\rtfignore{\wxheading{Members}}}
 212
 213 \membersection{wxDynamicLibraryDetails::GetName}\label{wxdynamiclibrarygetname}
 214
 215 \constfunc{wxString}{GetName}{\void}
 216
 217 Returns the base name of this module, e.g. \texttt{kernel32.dll} or
 218 \texttt{libc-2.3.2.so}.
 219
 220
 221 \membersection{wxDynamicLibraryDetails::GetPath}\label{wxdynamiclibrarygetpath}
 222
 223 \constfunc{wxString}{GetPath}{\void}
 224
 225 Returns the full path of this module if available, e.g.
 226 \texttt{c:$\backslash$windows$\backslash$system32$\backslash$kernel32.dll} or
 227 \texttt{/lib/libc-2.3.2.so}.
 228
 229
 230 \membersection{wxDynamicLibraryDetails::GetAddress}\label{wxdynamiclibrarygetaddress}
 231
 232 \constfunc{bool}{GetAddress}{\param{void **}{addr}, \param{size\_t }{*len}}
 233
 234 Retrieves the load address and the size of this module.
 235
 236 \wxheading{Parameters}
 237
 238 \docparam{addr}{the pointer to the location to return load address in, may be
 239 \texttt{NULL}}
 240
 241 \docparam{len}{pointer to the location to return the size of this module in
 242 memory in, may be \texttt{NULL}}
 243
 244 \wxheading{Return value}
 245
 246 \true if the load address and module size were retrieved, \false if this
 247 information is not available.
 248
 249
 250 \membersection{wxDynamicLibraryDetails::GetVersion}\label{wxdynamiclibrarygetversion}
 251
 252 \constfunc{wxString}{GetVersion}{\void}
 253
 254 Returns the version of this module, e.g. \texttt{5.2.3790.0} or
 255 \texttt{2.3.2}. The returned string is empty if the version information is not
 256 available.
 257