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++)，它有一个上下文菜单绑定(bind)到右键单击通知图标。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。动态菜单是这样生成的:

   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");

有没有办法知道点击了哪个项目，而不必为每个子菜单项定义它自己的 ID(上面代码中的 IDM_DEVICE)？ In 想要检测用户单击了子菜单 IDM_DEVICE 并且他单击了该子菜单中的第一项(测试 1)。

我想实现这样的目标:

  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

尝试以下操作:

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

现在您将获得 WM_MENUCOMMAND 而不是 WM_COMMAND。菜单索引将在 wParam 中，而菜单句柄将在 lParam 中。注意只吃掉已知菜单的消息，并将其余的传递给 DefWindowProc。代码将与此类似:

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