插件体系入门源码(vs2005)

/*------------------------------------------------------------ HELLOWIN.C -- Displays "Hello, Windows 98!" in client area (c) Charles Petzold, 1998 ------------------------------------------------------------*/ #include <windows.h> #include "IPlugin.h" #include <string> typedef IPlugin* (*PLUGIN_FACTORY)(); // function pointer bool LoadPlugins(); bool LoadPlugin(const char * pluginFullname, HMODULE * mod, IPlugin*& pluginRef); bool UnLoadPlugins(); bool UnLoadPlugin(HMODULE hMod, IPlugin* pluginRef); typedef void (*PLUGIN_CLEANUP)(IPlugin*); HMODULE hMods[2]; IPlugin* plugins[2]; LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ; int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow) { static TCHAR szAppName[] = TEXT ("HelloWin") ; HWND hwnd ; MSG msg ; WNDCLASS wndclass ; int i=0; wndclass.style = CS_HREDRAW | CS_VREDRAW ; wndclass.lpfnWndProc = WndProc ; wndclass.cbClsExtra = 0 ; wndclass.cbWndExtra = 0 ; wndclass.hInstance = hInstance ; wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ; wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ; wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ; wndclass.lpszMenuName = NULL ; wndclass.lpszClassName = szAppName ; if (!RegisterClass (&wndclass)) { MessageBox (NULL, TEXT ("This program requires Windows NT!"), szAppName, MB_ICONERROR) ; return 0 ; } hwnd = CreateWindow (szAppName, // window class name TEXT ("The Hello Program"), // window caption WS_OVERLAPPEDWINDOW, // window style CW_USEDEFAULT, // initial x position CW_USEDEFAULT, // initial y position CW_USEDEFAULT, // initial x size CW_USEDEFAULT, // initial y size NULL, // parent window handle NULL, // window menu handle hInstance, // program instance handle NULL) ; // creation parameters ShowWindow (hwnd, iCmdShow) ; UpdateWindow (hwnd) ; while (GetMessage (&msg, NULL, 0, 0)) { TranslateMessage (&msg) ; DispatchMessage (&msg) ; } return msg.wParam ; } LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { HDC hdc ; PAINTSTRUCT ps ; RECT rect ; switch (message) { case WM_CREATE: return 0 ; case WM_PAINT: hdc = BeginPaint (hwnd, &ps) ; EndPaint (hwnd, &ps) ; return 0 ; case WM_LBUTTONDOWN: LoadPlugins(); return 0; case WM_RBUTTONDOWN: UnLoadPlugins(); return 0; case WM_DESTROY: PostQuitMessage (0) ; return 0 ; } return DefWindowProc (hwnd, message, wParam, lParam) ; } bool LoadPlugins() { LoadPlugin("TextPlugin.dll", &hMods[0], plugins[0]); LoadPlugin("GraphPlugin.dll", &hMods[1], plugins[1]); return true; } bool LoadPlugin(const char * pluginFullname, HMODULE * mod,IPlugin*& pluginRef) { HMODULE hMod = ::LoadLibrary(pluginFullname); (*mod) = hMod; if(hMod == NULL) { return false; } PLUGIN_FACTORY func = (PLUGIN_FACTORY)::GetProcAddress(hMod, "CreatePlugin"); if(func == NULL) { return false; } pluginRef = (*func)(); std::string name = pluginRef ->GetName(); ::MessageBox(NULL, name.c_str(), "", MB_OK); return true; } bool UnLoadPlugins() { UnLoadPlugin(hMods[0], plugins[0]); UnLoadPlugin(hMods[1], plugins[1]); return true; } bool UnLoadPlugin(HMODULE hMod, IPlugin* pluginRef) { PLUGIN_CLEANUP func = (PLUGIN_CLEANUP)::GetProcAddress(hMod, "ReleasePlugin"); (*func)(pluginRef); if(! ::FreeLibrary(hMod) ) { return false; } return true; }