wxDynamicLibrary is a class representing dynamically loadable library (Windows DLL, shared library under Unix etc.). Just create an object of this class to load a library and don't worry about unloading it -- it will be done in the objects destructor automatically.
wxDynamicLibrary::wxDynamicLibrary
wxDynamicLibrary::CanonicalizeName
wxDynamicLibrary::CanonicalizePluginName
wxDynamicLibrary::Detach
wxDynamicLibrary::GetSymbol
wxDynamicLibrary::IsLoaded
wxDynamicLibrary::Load
wxDynamicLibrary::Unload
wxDynamicLibrary()
wxDynamicLibrary(const wxString& name, int flags = wxDL_DEFAULT)
Constructor. Second form calls Load.
wxString CanonicalizeName(const wxString& name, wxDynamicLibraryCategory cat = wxDL_LIBRARY)
Returns the platform-specific full name for the library called name. E.g. it adds a ".dll" extension under Windows and "lib" prefix and ".so", ".sl" or maybe ".dylib" extension under Unix.
The possible values for cat are:
| wxDL_LIBRARY | normal library |
| wxDL_MODULE | a loadable module or plugin |
See also
wxString CanonicalizePluginName(const wxString& name, wxPluginCategory cat = wxDL_PLUGIN_GUI)
This function does the same thing as CanonicalizeName but for wxWidgets plugins. The only difference is that compiler and version information are added to the name to ensure that the plugin which is going to be loaded will be compatible with the main program.
The possible values for cat are:
| wxDL_PLUGIN_GUI | plugin which uses GUI classes (default) |
| wxDL_PLUGIN_BASE | plugin which only uses wxBase |
wxDllType Detach()
Detaches this object from its library handle, i.e. the object will not unload the library any longer in its destructor but it is now the callers responsability to do this using Unload.
void* GetSymbol(const wxString& name) const
Returns pointer to symbol name in the library or NULL if the library contains no such symbol.
See also
bool IsLoaded() const
Returns true if the library was successfully loaded, false otherwise.
bool Load(const wxString& name, int flags = wxDL_DEFAULT)
Loads DLL with the given name into memory. The flags argument can be a combination of the following bits:
| wxDL_LAZY | equivalent of RTLD_LAZY under Unix, ignored elsewhere |
| wxDL_NOW | equivalent of RTLD_NOW under Unix, ignored elsewhere |
| wxDL_GLOBAL | equivalent of RTLD_GLOBAL under Unix, ignored elsewhere |
| wxDL_VERBATIM | don't try to append the appropriate extension to the library name (this is done by default). |
Returns true if the library was successfully loaded, false otherwise.
void Unload()
static void Unload(wxDllType handle)
Unloads the library from memory. wxDynamicLibrary object automatically calls this method from its destructor if it had been successfully loaded.
The second version is only used if you need to keep the library in memory during a longer period of time than the scope of the wxDynamicLibrary object. In this case you may call Detach and store the handle somewhere and call this static method later to unload it.