checkmenuitem.cpp

C#一个实例源代码

// CheckMenuItem.cpp : Defines the entry point for the application.
//

#include "stdafx.h"

#include <windows.h>
#include "resource.h"

#define ID_TIMER 1

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;

TCHAR szAppName[] = TEXT ("MenuDemo") ;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PSTR szCmdLine, int iCmdShow)
{
     HWND     hwnd ;
     MSG      msg ;
     WNDCLASS wndclass ;
	 HMENU      hMenu ;
     
     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  = szAppName ;
     wndclass.lpszClassName = szAppName ;

     if (!RegisterClass (&wndclass))
     {
          MessageBox (NULL, TEXT ("This program requires Windows NT!"),
                      szAppName, MB_ICONERROR) ;
          return 0 ;
     }
     
     hwnd = CreateWindow (szAppName, TEXT ("Menu Demonstration"),
                          WS_OVERLAPPEDWINDOW,
                          CW_USEDEFAULT, CW_USEDEFAULT,
                          CW_USEDEFAULT, CW_USEDEFAULT,
                          NULL, NULL, hInstance, NULL) ;
	 hMenu = CreateMenu () ;

     hMenuPopup = CreateMenu () ;

     AppendMenu (hMenuPopup, MF_STRING,    IDM_FILE_NEW,     "&New") ;
     AppendMenu (hMenuPopup, MF_STRING,    IDM_FILE_OPEN,    "&Open...") ;
     AppendMenu (hMenuPopup, MF_STRING,    IDM_FILE_SAVE,    "&Save") ;
     AppendMenu (hMenuPopup, MF_STRING,    IDM_FILE_SAVE_AS, "Save &As...")  ;
     AppendMenu (hMenuPopup, MF_SEPARATOR, 0,                NULL) ;
        AppendMenu (hMenuPopup, MF_STRING,    IDM_APP_EXIT,     "E&xit") ;

     AppendMenu (hMenu, MF_POPUP, hMenuPopup, "&File") ;

     hMenuPopup = CreateMenu () ;

     AppendMenu (hMenuPopup, MF_STRING,    IDM_EDIT_UNDO,  "&Undo") ;
        AppendMenu (hMenuPopup, MF_SEPARATOR, 0,              NULL) ;
       AppendMenu (hMenuPopup, MF_STRING,    IDM_EDIT_CUT,   "Cu&t") ;
       AppendMenu (hMenuPopup, MF_STRING,    IDM_EDIT_COPY,  "&Copy") ;
       AppendMenu (hMenuPopup, MF_STRING,    IDM_EDIT_PASTE, "&Paste") ;
        AppendMenu (hMenuPopup, MF_STRING,    IDM_EDIT_CLEAR, "De&lete") ;
       AppendMenu (hMenu, MF_POPUP, hMenuPopup, "&Edit") ;

     hMenuPopup = CreateMenu () ;

     AppendMenu (hMenuPopup, MF_STRING| MF_CHECKED, IDM_BKGND_WHITE,  "&White") ;
       AppendMenu (hMenuPopup, MF_STRING,             IDM_BKGND_LTGRAY, "&Light Gray");
      AppendMenu (hMenuPopup, MF_STRING,             IDM_BKGND_GRAY,   "&Gray") ;
        AppendMenu (hMenuPopup, MF_STRING,             IDM_BKGND_DKGRAY, "&Dark Gray");
         AppendMenu (hMenuPopup, MF_STRING,             IDM_BKGND_BLACK,  "&Black") ;

         AppendMenu (hMenu, MF_POPUP, hMenuPopup, "&Background") ;

        hMenuPopup = CreateMenu () ;

       AppendMenu (hMenuPopup, MF_STRING,             IDM_TIMER_START, "&Start") ;
          AppendMenu (hMenuPopup, MF_STRING | MF_GRAYED, IDM_TIMER_STOP,  "S&top") ;

           AppendMenu (hMenu, MF_POPUP, hMenuPopup, "&Timer") ;

         hMenuPopup = CreateMenu () ;

          AppendMenu (hMenuPopup, MF_STRING, IDM_HELP_HELP,  "&Help") ;
             AppendMenu (hMenuPopup, MF_STRING, IDM_APP_ABOUT,  "&About MenuDemo...") ;

            AppendMenu (hMenu, MF_POPUP, hMenuPopup, "&Help") ;


     
             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 int idColor [5] = { WHITE_BRUSH,  LTGRAY_BRUSH, GRAY_BRUSH,
                                DKGRAY_BRUSH, BLACK_BRUSH } ;
     static int iSelection = IDM_BKGND_WHITE ;
     HMENU      hMenu ;
     
     switch (message)
     {
     case WM_COMMAND:
          hMenu = GetMenu (hwnd) ;
          
          switch (LOWORD (wParam))
          {
          case IDM_FILE_NEW:
          case IDM_FILE_OPEN:
          case IDM_FILE_SAVE:
          case IDM_FILE_SAVE_AS:
               MessageBeep (0) ;
               return 0 ;

          case IDM_APP_EXIT:
               SendMessage (hwnd, WM_CLOSE, 0, 0) ;
               return 0 ;
               
          case IDM_EDIT_UNDO:
          case IDM_EDIT_CUT:
          case IDM_EDIT_COPY:
          case IDM_EDIT_PASTE:
          case IDM_EDIT_CLEAR:
               MessageBeep (0) ;
               return 0 ;
               
          case IDM_BKGND_WHITE:         // Note: Logic below
          case IDM_BKGND_LTGRAY:        //   assumes that IDM_WHITE
          case IDM_BKGND_GRAY:          //   through IDM_BLACK are
          case IDM_BKGND_DKGRAY:        //   consecutive numbers in
          case IDM_BKGND_BLACK:         //   the order shown here.
               
               CheckMenuItem (hMenu, iSelection, MF_UNCHECKED) ;
               iSelection = LOWORD (wParam) ;
               CheckMenuItem (hMenu, iSelection, MF_CHECKED) ;
               
               SetClassLong (hwnd, GCL_HBRBACKGROUND, (LONG) 
                    GetStockObject 
                             (idColor [LOWORD (wParam) - IDM_BKGND_WHITE])) ;
               
               InvalidateRect (hwnd, NULL, TRUE) ;
               return 0 ;
               
          case IDM_TIMER_START:
               if (SetTimer (hwnd, ID_TIMER, 1000, NULL))
               {
                    EnableMenuItem (hMenu, IDM_TIMER_START, MF_GRAYED) ;
                    EnableMenuItem (hMenu, IDM_TIMER_STOP,  MF_ENABLED) ;
               }
               return 0 ;
               
          case IDM_TIMER_STOP:
               KillTimer (hwnd, ID_TIMER) ;
               EnableMenuItem (hMenu, IDM_TIMER_START, MF_ENABLED) ;
               EnableMenuItem (hMenu, IDM_TIMER_STOP,  MF_GRAYED) ;
               return 0 ;

          case IDM_APP_HELP:
               MessageBox (hwnd, TEXT ("Help not yet implemented!"),
                           szAppName, MB_ICONEXCLAMATION | MB_OK) ;
               return 0 ;
               
          case IDM_APP_ABOUT:
               MessageBox (hwnd, TEXT ("Menu Demonstration Program\n")
                                 TEXT ("(c) Charles Petzold, 1998"),
                           szAppName, MB_ICONINFORMATION | MB_OK) ;
               return 0 ;
          }
          break ;
          
          case WM_TIMER:
               MessageBeep (0) ;
               return 0 ;
               
          case WM_DESTROY:
               PostQuitMessage (0) ;
               return 0 ;
     }
     return DefWindowProc (hwnd, message, wParam, lParam) ;
}