///////////////////////////////////////////////////////////////////////////// // Name: dynlib.h // Purpose: interface of wxDynamicLibrary and wxDynamicLibraryDetails // Author: wxWidgets team // RCS-ID: $Id$ // Licence: wxWindows license ///////////////////////////////////////////////////////////////////////////// /** @class wxDynamicLibraryDetails This class is used for the objects returned by the wxDynamicLibrary::ListLoaded() method and contains the information about a single module loaded into the address space of the current process. A module in this context may be either a dynamic library or the main program itself. @library{wxbase} @category{appmanagement} */ class wxDynamicLibraryDetails { public: /** Retrieves the load address and the size of this module. @param addr The pointer to the location to return load address in, may be @NULL. @param len Pointer to the location to return the size of this module in memory in, may be @NULL. @return @true if the load address and module size were retrieved, @false if this information is not available. */ bool GetAddress(void** addr, size_t len) const; /** Returns the base name of this module, e.g. @c "kernel32.dll" or @c "libc-2.3.2.so". */ wxString GetName() const; /** Returns the full path of this module if available, e.g. @c "c:\windows\system32\kernel32.dll" or @c "/lib/libc-2.3.2.so". */ wxString GetPath() const; /** Returns the version of this module, e.g. @c "5.2.3790.0" or @c "2.3.2". The returned string is empty if the version information is not available. */ wxString GetVersion() const; }; /** Dynamic library category used with wxDynamicLibrary::CanonicalizeName(). */ enum wxDynamicLibraryCategory { wxDL_LIBRARY, ///< Standard library. wxDL_MODULE ///< Loadable module/plugin. }; /** Dynamic library plugin category used with wxDynamicLibrary::CanonicalizePluginName(). */ enum wxPluginCategory { wxDL_PLUGIN_GUI, ///< Plugin that uses GUI classes. wxDL_PLUGIN_BASE ///< wxBase-only plugin. }; /** @class wxDynamicLibrary 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. The following flags can be used with wxDynamicLibrary() or Load(): @beginStyleTable @style{wxDL_LAZY} Equivalent of RTLD_LAZY under Unix, ignored elsewhere. @style{wxDL_NOW} Equivalent of RTLD_NOW under Unix, ignored elsewhere. @style{wxDL_GLOBAL} Equivalent of RTLD_GLOBAL under Unix, ignored elsewhere. @style{wxDL_VERBATIM} Don't try to append the appropriate extension to the library name (this is done by default). @style{wxDL_DEFAULT} Default flags, same as wxDL_NOW currently. @style{wxDL_QUIET} Don't log an error message if the library couldn't be loaded. @endStyleTable @library{wxbase} @category{appmanagement} */ class wxDynamicLibrary { public: /** Default constructor. */ wxDynamicLibrary(); /** Constructor. Calls Load() with the given @a name. */ wxDynamicLibrary(const wxString& name, int flags = wxDL_DEFAULT); /** Returns the platform-specific full name for the library called @a name. E.g. it adds a @c ".dll" extension under Windows and @c "lib" prefix and @c ".so", @c ".sl" or @c ".dylib" extension under Unix. @see CanonicalizePluginName() */ static wxString CanonicalizeName(const wxString& name, wxDynamicLibraryCategory cat = wxDL_LIBRARY); /** 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. */ static wxString CanonicalizePluginName(const wxString& name, wxPluginCategory cat = wxDL_PLUGIN_GUI); /** 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(). */ wxDllType Detach(); /** Return a valid handle for the main program itself or @NULL if symbols from the main program can't be loaded on this platform. */ static wxDllType GetProgramHandle(); /** Returns pointer to symbol @a name in the library or @NULL if the library contains no such symbol. @see wxDYNLIB_FUNCTION() */ void* GetSymbol(const wxString& name) const; /** This function is available only under Windows as it is only useful when dynamically loading symbols from standard Windows DLLs. Such functions have either @c 'A' (in ANSI build) or @c 'W' (in Unicode, or wide character build) suffix if they take string parameters. Using this function, you can use just the base name of the function and the correct suffix is appended automatically depending on the current build. Otherwise, this method is identical to GetSymbol(). */ void* GetSymbolAorW(const wxString& name) const; /** Returns @true if the symbol with the given @a name is present in the dynamic library, @false otherwise. Unlike GetSymbol(), this function doesn't log an error message if the symbol is not found. @since 2.5.4 */ bool HasSymbol(const wxString& name) const; /** Returns @true if the library was successfully loaded, @false otherwise. */ bool IsLoaded() const; /** This static method returns a wxArray containing the details of all modules loaded into the address space of the current project. The array elements are objects of the type: wxDynamicLibraryDetails. 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. */ static wxDynamicLibraryDetailsArray ListLoaded(); /** Loads DLL with the given @a name into memory. The @a flags argument can be a combination of the styles outlined in the class description. Returns @true if the library was successfully loaded, @false otherwise. */ bool Load(const wxString& name, int flags = wxDL_DEFAULT); /** Unloads the library from memory. wxDynamicLibrary object automatically calls this method from its destructor if it had been successfully loaded. */ void Unload(); /** Unloads the library from memory. wxDynamicLibrary object automatically calls this method from its destructor if it had been successfully loaded. This version of Unload() 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. */ static void Unload(wxDllType handle); }; // ============================================================================ // Global functions/macros // ============================================================================ /** @ingroup group_funcmacro_misc */ //@{ /** When loading a function from a DLL you always have to cast the returned void * pointer to the correct type and, even more annoyingly, you have to repeat this type twice if you want to declare and define a function pointer all in one line. This macro makes this slightly less painful by allowing you to specify the type only once, as the first parameter, and creating a variable of this type named after the function but with @c pfn prefix and initialized with the function @a name from the wxDynamicLibrary @a dynlib. @param type The type of the function. @param name The name of the function to load, not a string (without quotes, it is quoted automatically by the macro). @param dynlib The library to load the function from. @header{wx/dynlib.h} */ #define wxDYNLIB_FUNCTION(type, name, dynlib) //@}