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.

Derived from

No base class.

Include files


(only available if wxUSE_DYNLIB_CLASS is set to $1$)



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(void)

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 responsibility 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



static wxDllType GetProgramHandle(void)

Return a valid handle for the main program itself or NULL if symbols from the main program can't be loaded on this platform.


bool HasSymbol(const wxString& name) const

Returns TRUEif the symbol with the given name is present in the dynamic library, FALSEotherwise. Unlike GetSymbol, this function doesn't log an error message if the symbol is not found.

wxWidgets バージョン 2.5.4 で追加された機能です


bool IsLoaded(void) const

Returns TRUEif the library was successfully loaded, FALSEotherwise.


static wxDynamicLibraryDetailsArray ListLoaded(void)

This static method returns an array containing the details of all modules loaded into the address space of the current project, the array elements are object of wxDynamicLibraryDetails class. The array will be empty if an error occurred.

This method is currently implemented only under Win32 and Linux and is useful mostly for diagnostics purposes.


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).
wxDL_DEFAULT default flags, same as wxDL_NOW currently

Returns TRUEif the library was successfully loaded, FALSEotherwise.


void Unload(void)

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.

ymasuda 平成17年11月19日