c ++ win32动态菜单 - 选择了哪个菜单项

Question

我有一个win32应用程序(c ++),右键单击通知图标绑定上下文菜单.菜单/子菜单项在运行时动态创建和更改.

 InsertMenu(hSettings, 0, MF_BYPOSITION | MF_POPUP | MF_STRING, (UINT_PTR) hDevices, L"Setting 1");
 InsertMenu(hSettings, 1, MF_BYPOSITION | MF_POPUP | MF_STRING, (UINT_PTR) hChannels, L"Setting 2");

 InsertMenu(hMainMenu, 0, MF_BYPOSITION | MF_POPUP | MF_STRING, (UINT_PTR) hSettings, L"Settings");
 InsertMenu(hMainMenu, 1, MF_BYPOSITION | MF_STRING, IDM_EXIT, L"Exit"); 

在上面的代码中,hDevices和hChannels是动态生成的子菜单.动态菜单生成如下:

   InsertMenu(hDevices, i, style, IDM_DEVICE, L"Test 1");
   InsertMenu(hDevices, i, style, IDM_DEVICE, L"Test 2");
   InsertMenu(hDevices, i, style, IDM_DEVICE, L"Test 3");

有没有办法知道哪个项目被点击而不必定义每个子菜单项它自己的ID(上面代码中的IDM_DEVICE)？想要检测用户点击子菜单IDM_DEVICE并且他点击了此子菜单中的第一个项目(测试1).

我想得到这样的东西:

  case WM_COMMAND:
    wmId    = LOWORD(wParam);
    wmEvent = HIWORD(wParam);
    // Parse the menu selections:
    switch (wmId)
    {
        case IDM_DEVICE: // user clicked on Test 1 or Test 2 or Test 3 
            UINT index = getClickedMenuItem(); // get the index number of the clicked item (if you clicked on Test 1 it would be 0,..) 
                            // change the style of the menu item with that index 
            break;          
    }

Answer 1

请尝试以下方法:

MENUINFO mi;
memset(&mi, 0, sizeof(mi));
mi.cbSize = sizeof(mi);
mi.fMask = MIM_STYLE;
mi.dwStyle = MNS_NOTIFYBYPOS;
SetMenuInfo(hDevices, &mi);

现在你将得到WM_MENUCOMMAND而不是WM_COMMAND.菜单索引将在wParam中,菜单句柄在lParam中.请注意仅为已知菜单吃掉消息,然后将剩余菜单用于DefWindowProc.代码将类似于:

case WM_MENUCOMMAND:
    HMENU menu = (HMENU)lParam;
    int idx = wParam;
    if (menu == hDevices)
    {
       //Do useful things with device #idx
    }
    else
        break; //Ensure that after that there is a DefWindowProc call