A simple menu

最新推荐文章于 2024-12-31 11:50:08 发布

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本文介绍了一个简单的Windows应用程序，该程序使用Windows API创建了一个包含新建、打开和退出选项的菜单。通过Beep函数对选中菜单项进行了声音反馈，并实现了退出菜单项关闭窗口的功能。

#include <windows.h>

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

#define IDM_FILE_NEW 1
#define IDM_FILE_OPEN 2
#define IDM_FILE_QUIT 3

int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PWSTR lpCmdLine, int nCmdShow)
{
  MSG  msg;    
  WNDCLASSW wc = {0};
  wc.lpszClassName = L"Menu";
  wc.hInstance     = hInstance;
  wc.hbrBackground = GetSysColorBrush(COLOR_3DFACE);
  wc.lpfnWndProc   = WndProc;
  wc.hCursor       = LoadCursor(0, IDC_ARROW);

  RegisterClassW(&wc);
  CreateWindowW(wc.lpszClassName, L"Menu",
                WS_OVERLAPPEDWINDOW | WS_VISIBLE,
                100, 100, 200, 150, 0, 0, hInstance, 0);

  while( GetMessage(&msg, NULL, 0, 0)) {
    TranslateMessage(&msg);
    DispatchMessage(&msg);
  }

  return (int) msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, 
    WPARAM wParam, LPARAM lParam)
{   
  switch(msg)  
  {
      case WM_CREATE:
          AddMenus(hwnd);
          break;

      case WM_COMMAND:
          switch(LOWORD(wParam)) {
              case IDM_FILE_NEW:
              case IDM_FILE_OPEN:
                  Beep(50, 100);
                  break;
              case IDM_FILE_QUIT:
                  SendMessage(hwnd, WM_CLOSE, 0, 0);
                  break;
           }
           break;

      case WM_DESTROY:
          PostQuitMessage(0);
          break;
  }

  return DefWindowProcW(hwnd, msg, wParam, lParam);
}

void AddMenus(HWND hwnd) 
{
  HMENU hMenubar;
  HMENU hMenu;

  hMenubar = CreateMenu();
  hMenu    = CreateMenu();

  AppendMenuW(hMenu, MF_STRING, IDM_FILE_NEW, L"&New");
  AppendMenuW(hMenu, MF_STRING, IDM_FILE_OPEN, L"&Open");
  AppendMenuW(hMenu, MF_SEPARATOR, 0, NULL);
  AppendMenuW(hMenu, MF_STRING, IDM_FILE_QUIT, L"&Quit");

  AppendMenuW(hMenubar, MF_POPUP, (UINT_PTR)hMenu, L"&File");
  SetMenu(hwnd, hMenubar);
}