windows程序设计例题解析 POPMENU.C

最新推荐文章于 2021-05-17 11:06:31 发布

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本文档提供了一个Windows程序设计的示例，名为POPMENU.C，它演示了如何创建和使用弹出菜单。当鼠标右键点击时，程序会根据用户选择在背景颜色选项之间切换，包括白色、浅灰色、灰色、深灰色和黑色。通过CheckMenuItem和SetClassLong函数更新选中状态和窗口背景颜色，并使用TrackPopupMenu函数显示弹出菜单。

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/*----------------------------------------
POPMENU.C -- Popup Menu Demonstration
(c) Charles Petzold, 1998
----------------------------------------*/

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

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

HINSTANCE hInst ;
TCHAR szAppName[] = TEXT ("PopMenu") ;

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, szAppName) ;
     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 ;
     }

     hInst = hInstance ;

     hwnd = CreateWindow (szAppName, TEXT ("Popup 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 hMenu ;
     static int   idColor [5] = { WHITE_BRUSH, LTGRAY_BRUSH, GRAY_BRUSH,
                                  DKGRAY_BRUSH, BLACK_BRUSH } ;
     static int   iSelection = IDM_BKGND_WHITE ;
     POINT        point ;

     switch (message)
     {
     case WM_CREATE:
          hMenu = LoadMenu (hInst, szAppName) ;//加载主菜单
          hMenu = GetSubMenu (hMenu, 0) ; //获取第一个弹出菜单项的句柄，0表示第一个，1表示第二个
          return 0 ;

case WM_RBUTTONUP:

//鼠标右键释放时，显示出第一个弹出菜单
          point.x = LOWORD (lParam) ;
          point.y = HIWORD (lParam) ;
          ClientToScreen (hwnd, &point) ; //窗口坐标转为屏幕坐标，因为下面的这个函数要使用到屏幕坐标

          TrackPopupMenu (hMenu, TPM_RIGHTBUTTON, point.x, point.y,
                          0, hwnd, NULL) ; //该函数显示弹出菜单，point.x, point.y为屏幕坐标
          return 0 ;

     case WM_COMMAND://处理菜单消息
          switch (LOWORD (wParam)) //菜单ID
          {
          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 ;

          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_APP_ABOUT:
               MessageBox (hwnd, TEXT ("Popup Menu Demonstration Program\n")
                                 TEXT ("(c) Charles Petzold, 1998"),
                           szAppName, MB_ICONINFORMATION | MB_OK) ;
               return 0 ;

          case IDM_APP_EXIT:
               SendMessage (hwnd, WM_CLOSE, 0, 0) ;
               return 0 ;

          case IDM_APP_HELP:
               MessageBox (hwnd, TEXT ("Help not yet implemented!"),
                           szAppName, MB_ICONEXCLAMATION | MB_OK) ;
               return 0 ;
          }
          break ;

     case WM_DESTROY:
          PostQuitMessage (0) ;
          return 0 ;
     }
     return DefWindowProc (hwnd, message, wParam, lParam) ;
}