menu的实现

最新推荐文章于 2023-05-08 14:47:25 发布
q123456789098
最新推荐文章于 2023-05-08 14:47:25 发布
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CC 4.0 BY-SA版权
本文链接：https://blog.youkuaiyun.com/q123456789098/article/details/52042094
本文介绍了一个简单的Windows菜单演示程序，展示了如何处理WM_COMMAND消息，并通过不同的菜单选项改变窗口背景颜色及定时器操作。
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MENUDEMO.C
        
/*---------------------------------------------------------------------
        
  MENUDEMO.C --   Menu Demonstration
        
                                                         (c) Charles Petzold, 1998
        
-----------------------------------------------------------------------*/
        
#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 ;
        
   
        
           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) ;
        
   
        
           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) ;
        
}



最重要的菜单消息是WM_COMMAND，它表示使用者已经从菜单中选中了一个被启用的菜单项。第八章中的WM_COMMAND消息也可以由子窗口控件产生。如果您碰巧为菜单和子窗口控件使用同一ID码，那么您可以通过lParam的值来区别它们，菜单项的lParam其值为0，请参见表10-1。
表10-1
  菜单 控件
LOWORD
 (wParam): 菜单ID 控件ID
HIWORD (wParam): 0 通知码
lParam: 0 子窗口句柄