Thread: TrackPopupMenuEx

I needed a context menu for my program and found the function TrackPopupMenuEx on MSDN. However this function doesn't return until the menu is closed, and I can't put all my other code on hold until it closes. So, does there exist some other function which returns immediately and just sends the result to the window's message loop?

I tried creating a new thread which just called TrackPopupMenuEx, but for some reason the menu never appeared even though no error was returned.

I also have another question; how can I get a handle to a child window with a specific identifier?

I tried not specifying TPM_RETURNCMD however it still didn't return before the menu was closed. The only difference I could see was that it now always returned 1, rather than the identifier of the selected option.

I tried the following code for creating the menu in a thread. However nothing appears. TrackPopupMenuEx returns 0, GetLastError returns 0.

Code:

typedef struct popupMenuStruct
{
    HMENU *menu;
    HWND *wnd;
    int x, y;
};

DWORD WINAPI DisplayPopupMenu( void *v )
{
    popupMenuStruct *PMS = (popupMenuStruct*) v;
    int ret = TrackPopupMenuEx( *PMS->menu,
                                TPM_LEFTALIGN | TPM_TOPALIGN | TPM_RETURNCMD |
                                TPM_LEFTBUTTON | TPM_HORIZONTAL,
                                PMS->x,
                                PMS->y,
                                *PMS->wnd,
                                NULL );
    
    printf( "TrackPopupMenuEx: %d\n", ret );
    printf( "error: %d\n", GetLastError() );
    return 0;
}

...

popupMenuStruct *popupInfo = new popupMenuStruct;
popupInfo->menu = &userInfoMenu;
popupInfo->wnd = &WindowHandle;
popupInfo->x = 100;
popupInfo->y = 100;
CreateThread( NULL, 0, &DisplayPopupMenu, (void*)popupInfo, 0, NULL );

For what kind of use the context menu is intended ?

Is it for a TrayIcon or just for the window ... ?
Hm, anyway ..., try this in your WinMain() instead of GetMessage() ...

Code:

    while (TRUE) {
        
        if (PeekMessage (&msg, NULL, 0, 0, PM_REMOVE)) {
            if (msg.message == WM_QUIT)
                break;
            TranslateMessage (&msg);
            DispatchMessage (&msg);
        } else {
            // Your code here ...
        }
    }
    return msg.wParam;

http://msdn.microsoft.com/en-us/libr...43(VS.85).aspx


Greetz

It's intended for the window. It will popup when an on screen button is clicked.

And I'm already using PeekMessage.