+// ----------------------------------------------------------------------------
+// wxDllLoader: low level DLL functions, use wxDynamicLibrary in your code
+// ----------------------------------------------------------------------------
+
+/*
+ wxDllLoader is a class providing an interface similar to unix's dlopen().
+ It is used by wxDynamicLibrary wxLibrary and manages the actual loading of
+ DLLs and the resolving of symbols in them. There are no instances of this
+ class, it simply serves as a namespace for its static member functions.
+*/
+class WXDLLEXPORT wxDllLoader
+{
+public:
+ /*
+ This function loads the shared library libname into memory.
+
+ libname may be either the full path to the file or just the filename in
+ which case the library is searched for in all standard locations
+ (use GetDllExt() to construct the filename)
+
+ if success pointer is not NULL, it will be filled with TRUE if everything
+ went ok and FALSE otherwise
+ */
+ static wxDllType LoadLibrary(const wxString& libname, bool *success = NULL);
+
+ /*
+ This function unloads the shared library previously loaded with
+ LoadLibrary
+ */
+ static void UnloadLibrary(wxDllType dll);
+
+ /*
+ This function returns a valid handle for the main program
+ itself or NULL if back linking is not supported by the current platform
+ (e.g. Win32).
+ */
+ static wxDllType GetProgramHandle();
+
+ /*
+ This function resolves a symbol in a loaded DLL, such as a
+ variable or function name.
+
+ dllHandle Handle of the DLL, as returned by LoadDll().
+ name Name of the symbol.
+
+ Returns the pointer to the symbol or NULL on error.
+ */
+ static void * GetSymbol(wxDllType dllHandle, const wxString &name);
+
+ // return the standard DLL extension (with leading dot) for this platform
+ static wxString GetDllExt();
+
+private:
+ // forbid construction of objects
+ wxDllLoader();
+};
+
+// ----------------------------------------------------------------------------
+// wxDynamicLibrary - friendly interface to wxDllLoader
+// ----------------------------------------------------------------------------
+
+class WXDLLEXPORT wxDynamicLibrary
+{
+public:
+ // ctors
+ wxDynamicLibrary() { m_library = 0; }
+ wxDynamicLibrary(const wxString& name) { Load(name); }
+
+ // return TRUE if the library was loaded successfully
+ bool IsLoaded() const { return m_library != 0; }
+ operator bool() const { return IsLoaded(); }
+
+ // load the library with the given name (full or not), return TRUE on
+ // success
+ bool Load(const wxString& name)
+ {
+ m_library = wxDllLoader::LoadLibrary(name);
+
+ return IsLoaded();
+ }
+
+ // unload the library, also done automatically in dtor
+ void Unload()
+ {
+ if ( IsLoaded() )
+ wxDllLoader::UnloadLibrary(m_library);
+ }
+
+ // load a symbol from the library, return NULL if an error occured or
+ // symbol wasn't found
+ void *GetSymbol(const wxString& name) const
+ {
+ wxCHECK_MSG( IsLoaded(), NULL,
+ _T("can't load symbol from unloaded library") );
+
+ return wxDllLoader::GetSymbol(m_library, name);
+ }
+
+ // unload the library
+ //
+ // NB: dtor is not virtual, don't derive from this class
+ ~wxDynamicLibrary() { Unload(); }
+
+private:
+ // the handle to DLL or NULL
+ wxDllType m_library;
+
+ // no copy ctor/assignment operators (or we'd try to unload the library
+ // twice)
+ DECLARE_NO_COPY_CLASS(wxDynamicLibrary);
+};
+
+// ----------------------------------------------------------------------------
projects / wxWidgets.git / blobdiff