BUG: DrawFocusRect Fails in MM_LOMETRIC or MM_ISOTROPIC Mode

• Microsoft Windows Software Development Kit (SDK) for Windows versions 3.0 and 3.1

SYMPTOMS

If DrawFocusRect() is called when the mapping mode is MM_LOMETRIC or MM_ISOTROPIC, no rectangle is drawn.

DrawFocusRect() is documented to take logical units and works properly in MM_TEXT mapping mode. However, if the mapping mode is changed to MM_LOMETRIC or MM_ISOTROPIC, as in the following code fragment, DrawFocusRect() called with an appropriate rectangle (logical units) does not work. Calling Rectangle() with the same rectangle does work.

   case WM_PAINT:
         hDC = BeginPaint(hWnd, &ps);

            SetRect(&rc, 0,0,100,100);
            DrawFocusRect(hDC, &rc);      // Works as documented.

            SetMapMode(hDC, MM_LOMETRIC);
            SetRect(&rc, 1,-200,100,-300);
            DrawFocusRect(hDC, &rc);     // Doesn't do anything.
       Rectangle(hDC, rc.left, rc.top, rc.right, rc.bottom); // Works

            EndPaint(hWnd, &ps);
            break;

STATUS

Microsoft has confirmed this to be a bug in Windows versions 3.0 and 3.1. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.