Windows程序设计 ClipView（源代码）.rar

/*----------------------------------------- CLIPVIEW.C -- Simple Clipboard Viewer (c) Charles Petzold, 1998 -----------------------------------------*/ #include <windows.h> LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ; int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow) { static TCHAR szAppName[] = TEXT ("ClipView") ; HWND hwnd ; MSG msg ; WNDCLASS wndclass ; 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, TEXT ("Simple Clipboard Viewer (Text Only)"), WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance, NULL) ; 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) { static HWND hwndNextViewer ; HGLOBAL hGlobal ; HDC hdc ; PTSTR pGlobal ; PAINTSTRUCT ps ; RECT rect ; switch (message) { case WM_CREATE: hwndNextViewer = SetClipboardViewer (hwnd) ; return 0 ; case WM_CHANGECBCHAIN: if ((HWND) wParam == hwndNextViewer) hwndNextViewer = (HWND) lParam ; else if (hwndNextViewer) SendMessage (hwndNextViewer, message, wParam, lParam) ; return 0 ; case WM_DRAWCLIPBOARD: if (hwndNextViewer) SendMessage (hwndNextViewer, message, wParam, lParam) ; InvalidateRect (hwnd, NULL, TRUE) ; return 0 ; case WM_PAINT: hdc = BeginPaint (hwnd, &ps) ; GetClientRect (hwnd, &rect) ; OpenClipboard (hwnd) ; #ifdef UNICODE hGlobal = GetClipboardData (CF_UNICODETEXT) ; #else hGlobal = GetClipboardData (CF_TEXT) ; #endif if (hGlobal != NULL) { pGlobal = (PTSTR) GlobalLock (hGlobal) ; DrawText (hdc, pGlobal, -1, &rect, DT_EXPANDTABS) ; GlobalUnlock (hGlobal) ; } CloseClipboard () ; EndPaint (hwnd, &ps) ; return 0 ; case WM_DESTROY: ChangeClipboardChain (hwnd, hwndNextViewer) ; PostQuitMessage (0) ; return 0 ; } return DefWindowProc (hwnd, message, wParam, lParam) ; }