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 \wxheading{Derived from}
  20
  21 No base class.
  22
  23 \wxheading{Include files}
  24
  25 <wx/dynlib.h>
  26
  27 \wxheading{Library}
  28
  29 \helpref{wxBase}{librarieslist}
  30
  31 (only available if \texttt{wxUSE\_DYNLIB\_CLASS} is set to $1$)
  32
  33 \latexignore{\rtfignore{\wxheading{Members}}}
  34
  35 \membersection{wxDynamicLibrary::wxDynamicLibrary}\label{wxdynamiclibrarywxdynamiclibrary}
  36
  37 \func{}{wxDynamicLibrary}{\void}
  38
  39 \func{}{wxDynamicLibrary}{\param{const wxString\& }{name}, \param{int }{flags = wxDL\_DEFAULT}}
  40
  41 Constructor. Second form calls \helpref{Load}{wxdynamiclibraryload}.
  42
  43
  44 \membersection{wxDynamicLibrary::CanonicalizeName}\label{wxdynamiclibrarycanonicalizename}
  45
  46 \func{static wxString}{CanonicalizeName}{\param{const wxString\& }{name}, \param{wxDynamicLibraryCategory}{ cat = wxDL\_LIBRARY}}
  47
  48 Returns the platform-specific full name for the library called \arg{name}. E.g.
  49 it adds a {\tt ".dll"} extension under Windows and {\tt "lib"} prefix and
  50 {\tt ".so"}, {\tt ".sl"} or maybe {\tt ".dylib"} extension under Unix.
  51
  52 The possible values for \arg{cat} are:
  53
  54 \begin{twocollist}
  55     \twocolitem{wxDL\_LIBRARY}{normal library}
  56     \twocolitem{wxDL\_MODULE}{a loadable module or plugin}
  57 \end{twocollist}
  58
  59 \wxheading{See also}
  60
  61 \helpref{CanonicalizePluginName}{wxdynamiclibrarycanonicalizepluginname}
  62
  63
  64
  65 \membersection{wxDynamicLibrary::CanonicalizePluginName}\label{wxdynamiclibrarycanonicalizepluginname}
  66
  67 \func{static wxString}{CanonicalizePluginName}{\param{const wxString\& }{name}, \param{wxPluginCategory}{ cat = wxDL\_PLUGIN\_GUI}}
  68
  69 This function does the same thing as
  70 \helpref{CanonicalizeName}{wxdynamiclibrarycanonicalizename} but for wxWidgets
  71 plugins. The only difference is that compiler and version information are added
  72 to the name to ensure that the plugin which is going to be loaded will be
  73 compatible with the main program.
  74
  75 The possible values for \arg{cat} are:
  76
  77 \begin{twocollist}
  78     \twocolitem{wxDL\_PLUGIN\_GUI}{plugin which uses GUI classes (default)}
  79     \twocolitem{wxDL\_PLUGIN\_BASE}{plugin which only uses wxBase}
  80 \end{twocollist}
  81
  82
  83 \membersection{wxDynamicLibrary::Detach}\label{wxdynamiclibrarydetach}
  84
  85 \func{wxDllType}{Detach}{\void}
  86
  87 Detaches this object from its library handle, i.e. the object will not unload
  88 the library any longer in its destructor but it is now the callers
  89 responsibility to do this using \helpref{Unload}{wxdynamiclibraryunload}.
  90
  91
  92 \membersection{wxDynamicLibrary::GetSymbol}\label{wxdynamiclibrarygetsymbol}
  93
  94 \constfunc{void *}{GetSymbol}{\param{const wxString\& }{name}}
  95
  96 Returns pointer to symbol {\it name} in the library or NULL if the library
  97 contains no such symbol.
  98
  99 \wxheading{See also}
 100
 101 \helpref{wxDYNLIB\_FUNCTION}{wxdynlibfunction}
 102
 103
 104 \membersection{wxDynamicLibrary::GetSymbolAorW}\label{wxdynamiclibrarygetsymbolaorw}
 105
 106 \constfunc{void *}{GetSymbolAorW}{\param{const wxString\& }{name}}
 107
 108 This function is available only under Windows as it is only useful when
 109 dynamically loading symbols from standard Windows DLLs. Such functions have
 110 either \texttt{'A'} (in ANSI build) or \texttt{'W'} (in Unicode, or wide
 111 character build) suffix if they take string parameters. Using this function you
 112 can use just the base name of the function and the correct suffix is appende
 113 automatically depending on the current build. Otherwise, this method is
 114 identical to \helpref{GetSymbol}{wxdynamiclibrarygetsymbol}.
 115
 116
 117 \membersection{wxDynamicLibrary::GetProgramHandle}\label{wxdynamiclibrarygetprogramhandle}
 118
 119 \func{static wxDllType}{GetProgramHandle}{\void}
 120
 121 Return a valid handle for the main program itself or \texttt{NULL} if symbols
 122 from the main program can't be loaded on this platform.
 123
 124
 125 \membersection{wxDynamicLibrary::HasSymbol}\label{wxdynamiclibraryhassymbol}
 126
 127 \constfunc{bool}{HasSymbol}{\param{const wxString\& }{name}}
 128
 129 Returns \true if the symbol with the given \arg{name} is present in the dynamic
 130 library, \false otherwise. Unlike \helpref{GetSymbol}{wxdynamiclibrarygetsymbol},
 131 this function doesn't log an error message if the symbol is not found.
 132
 133 \newsince{2.5.4}
 134
 135
 136 \membersection{wxDynamicLibrary::IsLoaded}\label{wxdynamiclibraryisloaded}
 137
 138 \constfunc{bool}{IsLoaded}{\void}
 139
 140 Returns \true if the library was successfully loaded, \false otherwise.
 141
 142
 143 \membersection{wxDynamicLibrary::ListLoaded}\label{wxdynamiclibrarylistloaded}
 144
 145 \func{static wxDynamicLibraryDetailsArray}{ListLoaded}{\void}
 146
 147 This static method returns an \helpref{array}{wxarray} containing the details
 148 of all modules loaded into the address space of the current project, the array
 149 elements are object of \texttt{wxDynamicLibraryDetails} class. The array will
 150 be empty if an error occurred.
 151
 152 This method is currently implemented only under Win32 and Linux and is useful
 153 mostly for diagnostics purposes.
 154
 155
 156 \membersection{wxDynamicLibrary::Load}\label{wxdynamiclibraryload}
 157
 158 \func{bool}{Load}{\param{const wxString\& }{name}, \param{int }{flags = wxDL\_DEFAULT}}
 159
 160 Loads DLL with the given \arg{name} into memory. The \arg{flags} argument can
 161 be a combination of the following bits:
 162
 163 \begin{twocollist}
 164 \twocolitem{wxDL\_LAZY}{equivalent of RTLD\_LAZY under Unix, ignored elsewhere}
 165 \twocolitem{wxDL\_NOW}{equivalent of RTLD\_NOW under Unix, ignored elsewhere}
 166 \twocolitem{wxDL\_GLOBAL}{equivalent of RTLD\_GLOBAL under Unix, ignored elsewhere}
 167 \twocolitem{wxDL\_VERBATIM}{don't try to append the appropriate extension to
 168 the library name (this is done by default).}
 169 \twocolitem{wxDL\_DEFAULT}{default flags, same as wxDL\_NOW currently}
 170 \twocolitem{wxDL\_QUIET}{don't log an error message if the library couldn't be
 171 loaded.}
 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 \wxheading{Library}
 210
 211 \helpref{wxBase}{librarieslist}
 212
 213 (only available if \texttt{wxUSE\_DYNLIB\_CLASS} is set to $1$)
 214
 215 \latexignore{\rtfignore{\wxheading{Members}}}
 216
 217 \membersection{wxDynamicLibraryDetails::GetName}\label{wxdynamiclibrarygetname}
 218
 219 \constfunc{wxString}{GetName}{\void}
 220
 221 Returns the base name of this module, e.g. \texttt{kernel32.dll} or
 222 \texttt{libc-2.3.2.so}.
 223
 224
 225 \membersection{wxDynamicLibraryDetails::GetPath}\label{wxdynamiclibrarygetpath}
 226
 227 \constfunc{wxString}{GetPath}{\void}
 228
 229 Returns the full path of this module if available, e.g.
 230 \texttt{c:$\backslash$windows$\backslash$system32$\backslash$kernel32.dll} or
 231 \texttt{/lib/libc-2.3.2.so}.
 232
 233
 234 \membersection{wxDynamicLibraryDetails::GetAddress}\label{wxdynamiclibrarygetaddress}
 235
 236 \constfunc{bool}{GetAddress}{\param{void **}{addr}, \param{size\_t }{*len}}
 237
 238 Retrieves the load address and the size of this module.
 239
 240 \wxheading{Parameters}
 241
 242 \docparam{addr}{the pointer to the location to return load address in, may be
 243 \texttt{NULL}}
 244
 245 \docparam{len}{pointer to the location to return the size of this module in
 246 memory in, may be \texttt{NULL}}
 247
 248 \wxheading{Return value}
 249
 250 \true if the load address and module size were retrieved, \false if this
 251 information is not available.
 252
 253
 254 \membersection{wxDynamicLibraryDetails::GetVersion}\label{wxdynamiclibrarygetversion}
 255
 256 \constfunc{wxString}{GetVersion}{\void}
 257
 258 Returns the version of this module, e.g. \texttt{5.2.3790.0} or
 259 \texttt{2.3.2}. The returned string is empty if the version information is not
 260 available.
 261