Multiple Trackbars and controling them both

How would one go about controlling two horizontal slider bars created from the trackbar_class and be able to process the message for each one of them independantly.

I tried somehting like this:

Code:

---

case WM_HSCROLL:
{
    switch(LOWORD(lParam))
    {                               
        case TB_LINEUP:
        {
            switch(LOWORD(wParam))
            {
                case HSCROLLTOP:
            }
        }
    }
}

---

MSDN says that the wParam is the source of the message but I have not found this to be the case so I am obviously doing something wrong.

Quote:

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Originally Posted by MSDN: About Trackbar Controls

A trackbar notifies its parent window of user actions by sending the parent a WM_HSCROLL or WM_VSCROLL message. A trackbar with the TBS_HORZ style sends WM_HSCROLL messages. A trackbar with the TBS_VERT style sends WM_VSCROLL messages. The low-order word of the wParam parameter of WM_HSCROLL or WM_VSCROLL contains the notification code. For the TB_THUMBPOSITION and TB_THUMBTRACK notifications, the high-order word of the wParam parameter specifies the position of the slider. For all other notifications, the high-order word is zero; send the TBM_GETPOS message to determine the slider position. The lParam parameter is the handle to the trackbar.

---

So to get the three required bits of information we have:

Code:

---

case WM_HSCROLL:
    int ctrlID = GetDlgCtrlID((HWND) lParam);
    int requestID = LOWORD(wParam);
    int position = SendMessage((HWND) lParam, TBM_GETPOS, 0, 0);

    switch (requestID)
    {
        case TB_LINEUP:
        {
            switch (ctrlID)
            {
                case TRACKBAR1:
                ...

                case TRACKBAR2:
                ...
            }
        }
    }

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ah hok, excellent. I see where my mistake was. I was not doing the GetControlID. Thanks