一、Windows对话框—建立「About」对话框
Windows程序即使不需要接收使用者输入,也通常具有由菜单上的「About」选项启动的对话框,该对话框用来显示程序的名字、图标、版权旗标和标记为「OK」的按键,也许还会有其它信息(例如技术支持的电话号码)。我们将要看到的第一个程序除了显示一个「About」对话框外,别无它用。这个ABOUT1程序如程序11-1所示:
程序11-1 ABOUT1
ABOUT1.C /*------------------------------------------------------------------------ ABOUT1.C -- About Box Demo Program No. 1 (c) Charles Petzold, 1998 -------------------------------------------------------------------------*/ #include <windows.h> #include "resource.h" LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ; BOOL CALLBACK AboutDlgProc (HWND, UINT, WPARAM, LPARAM) ; int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow) { static TCHAR szAppName[] = TEXT ("About1") ; MSG msg ; HWND hwnd ; WNDCLASS wndclass ; wndclass.style = CS_HREDRAW | CS_VREDRAW ; wndclass.lpfnWndProc = WndProc ; wndclass.cbClsExtra = 0 ; wndclass.cbWndExtra = 0 ; wndclass.hInstance = hInstance ; wndclass.hIcon = LoadIcon (hInstance, szAppName) ; wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ; wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ; wndclass.lpszMenuName = szAppName ; wndclass.lpszClassName = szAppName ; if (!RegisterClass (&wndclass)) { MessageBox (NULL, TEXT ("This program requires Windows NT!"), szAppName, MB_ICONERROR) ; return 0 ; } hwnd = CreateWindow (szAppName, TEXT ("About Box Demo Program"), 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 HINSTANCE hInstance ; switch (message) { case WM_CREATE : hInstance = ((LPCREATESTRUCT) lParam)->hInstance ; return 0 ; case WM_COMMAND : switch (LOWORD (wParam)) { case IDM_APP_ABOUT : DialogBox (hInstance, TEXT ("AboutBox"), hwnd, AboutDlgProc) ; break ; } return 0 ; case WM_DESTROY : PostQuitMessage (0) ; return 0 ; } return DefWindowProc (hwnd, message, wParam, lParam) ; } BOOL CALLBACK AboutDlgProc (HWND hDlg, UINT message,WPARAM wParam, LPARAM lParam) { switch (message) { case WM_INITDIALOG : return TRUE ; case WM_COMMAND : switch (LOWORD (wParam)) { case IDOK : case IDCANCEL : EndDialog (hDlg, 0) ; return TRUE ; } break ; } return FALSE ; }
ABOUT1.RC (摘录)
//Microsoft Developer Studio generated resource script. #include "resource.h" #include "afxres.h" ///////////////////////////////////////////////////////////////////////////// // Dialog ABOUTBOX DIALOG DISCARDABLE 32, 32, 180, 100 STYLE DS_MODALFRAME | WS_POPUP FONT 8, "MS Sans Serif" BEGIN DEFPUSHBUTTON "OK",IDOK,66,80,50,14 ICON "ABOUT1",IDC_STATIC,7,7,21,20 CTEXT "About1",IDC_STATIC,40,12,100,8 CTEXT "About Box Demo Program",IDC_STATIC,7,40,166,8 CTEXT "(c) Charles Petzold, 1998",IDC_STATIC,7,52,166,8 END ///////////////////////////////////////////////////////////////////////////// // Menu ABOUT1 MENU DISCARDABLE BEGIN POPUP "&Help" BEGIN MENUITEM "&About About1...", IDM_APP_ABOUT END END ///////////////////////////////////////////////////////////////////////////// // Icon ABOUT1 ICON DISCARDABLE "About1.ico"
RESOURCE.H (摘录)
// Microsoft Developer Studio generated include file. // Used by About1.rc #define IDM_APP_ABOUT 40001 #define IDC_STATIC -1
ABOUT1.ICO |
藉由后面章节中介绍的方法,您还可以在程序中建立图标和菜单。图示和菜单的ID名均为「About1」。菜单有一个选项,它产生一条ID名为IDM_APP_ABOUT的WM_COMMAND消息。这使得程序显示的图11-1所示的对话框。