现在让我们稍微偏离我们所讨论的主题。如果在您的程序中没有下拉式菜单，而是建立了多个没有弹出式菜单的顶层菜单，并呼叫SetMenu在顶层菜单之间切换，那会是什么样的情形呢？就像Lotus 1-2-3中老式的文字模式菜单那样。程序10-8中的NOPOPUPS程序展示了处理这种情况。在这个程序中，「File」和「Edit」项与MENUDEMO程序中的类似，但是却以另一种顶层菜单显示出来。
程序10-8 NOPOPUPS
NOPOPUPS.C /*------------------------------------------------------------------------- NOPOPUPS.C -- Demonstrates No-Popup Nested Menu (c) Charles Petzold, 1998 -------------------------------------------------------------------------*/ #include <windows.h> #include "resource.h" LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ; int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow) { static TCHAR szAppName[] = TEXT ("NoPopUps") ; 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 ("No-Popup Nested Menu Demonstration"), 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 HMENU hMenuMain, hMenuEdit, hMenuFile ; HINSTANCE hInstance ; switch (message) { case WM_CREATE: hInstance = (HINSTANCE) GetWindowLong (hwnd, GWL_HINSTANCE) ; hMenuMain = LoadMenu (hInstance, TEXT ("MenuMain")) ; hMenuFile = LoadMenu (hInstance, TEXT ("MenuFile")) ; hMenuEdit = LoadMenu (hInstance, TEXT ("MenuEdit")) ; SetMenu (hwnd, hMenuMain) ; return 0 ; case WM_COMMAND: switch (LOWORD (wParam)) { case IDM_MAIN: SetMenu (hwnd, hMenuMain) ; return 0 ; case IDM_FILE: SetMenu (hwnd, hMenuFile) ; return 0 ; case IDM_EDIT: SetMenu (hwnd, hMenuEdit) ; return 0 ; case IDM_FILE_NEW: case IDM_FILE_OPEN: case IDM_FILE_SAVE: case IDM_FILE_SAVE_AS: case IDM_EDIT_UNDO: case IDM_EDIT_CUT: case IDM_EDIT_COPY: case IDM_EDIT_PASTE: case IDM_EDIT_CLEAR: MessageBeep (0) ; return 0 ; } break ; case WM_DESTROY: SetMenu (hwnd, hMenuMain) ; DestroyMenu (hMenuFile) ; DestroyMenu (hMenuEdit) ; PostQuitMessage (0) ; return 0 ; } return DefWindowProc (hwnd, message, wParam, lParam) ; }