Displaying a tool tip on a dialog

Hi,

I need to display a ToolTip on a DialogBox (for example, to display the mouse coordinates). I'm drawing some graphics on a Dialog using CPaintDC device context in OnPaint handler function (WM_PAINT message). I can't see any ToolTipText() member function or something in CPaintDC.

Thanks,

I don't know if you can use this:

Code:

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/************************************\
 * Adds a tooltip to a control      *
 * Input:                          *
 *  hWndDlg        ->ParentWindowHandle    *
 *  hWndCtrl->Handle to the control *
 *  hInst          ->Application instance  *
 *  achTip        ->Text for the tip      *
 * Output:                          *
 *  0=ERR, 1=OK                    *
 * Author: Knut Øverli              *
\************************************/
long AddTip(HWND hWndDlg, HWND hWndCtrl, HINSTANCE *hInst, char *achTip){
        TOOLINFO ti;
        HWND hWndTip;

        memset(&ti, 0, sizeof(TOOLINFO));
        hWndTip = CreateWindowEx(0, TOOLTIPS_CLASS, NULL, WS_POPUP|TTS_NOPREFIX|TTS_ALWAYSTIP, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, hWndDlg, NULL, *hInst, NULL);
        SetWindowPos(hWndTip, HWND_TOPMOST,0, 0, 0, 0, SWP_NOMOVE|SWP_NOSIZE|SWP_NOACTIVATE);
        SendMessage(hWndTip, TTM_ACTIVATE, TRUE, 0);
       
        ti.cbSize = sizeof(ti);
        ti.uFlags = TTF_IDISHWND|TTF_SUBCLASS;
        ti.uId = (UINT)hWndCtrl;
        ti.lpszText = achTip;
        ti.hinst = *hInst;
        ti.hwnd = hWndDlg;
        return SendMessage(hWndTip, TTM_ADDTOOL, 0, (long)&ti);
}

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the parent will get WM_NOTIFY msg's and you will have to respond to the TTN_GETDISPINFO code and insert the text you need. This will need the ID of the control (or some way to get the right string).

In knutso's example he does not set the HMENU param in the CreateWindow to the int ID of the control, you should set it to a unique value (use a hash define)

Code:

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case WM_NOTIFY:
        switch (((LPNMHDR) lParam)->code)
        {
                case TTN_GETDISPINFO:
                        lpttt = (LPTOOLTIPTEXT)  lParam;
                        lpttt->hinst = hInst;
                        idCtrl = lpttt->hdr.idFrom;
                        lpttt->lpszText = sText;
                        return TRUE;
                break; //syntax

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