c++ - How to get tooltip text for a given HWND?

Question

I'm looking for a way to get the tooltip control (if any) which is associated with a given HWND. The text of the tooltip control would be sufficient, too. The closest thing I found is the TTM_GETTEXT message, but it's meant to be sent to the tooltip control itself instead of the tool it's associated with. I don't have a handle to the tooltip control though. Does anybody know how to do this?

All this is done using plain Windows API in C++.

Answer 1

There doesn't seem to be a specific message to get the tip or its text from the control, but this is how MFC's CWnd class implements OnToolHitTest(), which you should be able to adapt to Win32:

INT_PTR SomeFunction(HWND hWndChild, TOOLINFO *pTI)
{
    if (hWndChild != NULL) // Your HWND being tested
    {
        // return positive hit if control ID isn't -1
        INT_PTR nHit = _AfxGetDlgCtrlID(hWndChild);
        // Replace with GetDlgCtrlID().

        // hits against child windows always center the tip
        if (pTI != NULL && pTI->cbSize >= sizeof(AFX_OLDTOOLINFO))
        {
            // setup the TOOLINFO structure
            pTI->hwnd = m_hWnd;
            pTI->uId = (UINT_PTR)hWndChild;
            pTI->uFlags |= TTF_IDISHWND;
            pTI->lpszText = LPSTR_TEXTCALLBACK;

            // set TTF_NOTBUTTON and TTF_CENTERTIP if it isn't a button
            if (!(::SendMessage(hWndChild, WM_GETDLGCODE, 0, 0) & DLGC_BUTTON))
                pTI->uFlags |= TTF_NOTBUTTON|TTF_CENTERTIP;
        }
        return nHit;
    }
    return -1;  // not found
}

Hopefully this will be useful.