ID Number: Q76533
3.00
WINDOWS
Summary:
SYMPTOMS
When a Windows multiple document interface (MDI) child window is
created and the style field of the MDICREATESTRUCT contains
WS_HSCROLL and/or WS_VSCROLL, no scroll bar is displayed.
CAUSE
The scroll bar scroll range has not been set.
RESOLUTION
Set the scroll range to a nonzero interval.
More Information:
The scroll range can be set during the processing of the WM_CREATE
message or in response to a user action when the object to be
displayed extends beyond the window. The following code sets the
scroll range:
// hWnd is the handle to the MDI child window.
// 0 is the minimum scrolling position
// 100 is the maximum scrolling position
// set horizontal scroll bar range.
SetScrollRange(hWnd, SB_HORZ, 0, 100, TRUE);
// set vertical scroll bar range.
SetScrollRange(hWnd, SB_VERT, 0, 100, TRUE);
The scroll bar scroll range can be set to any nonzero interval
provided that the difference between the maximum scrolling position
and the minimum scrolling position is not greater than 32,767.
Note: There is a problem in Windows 3.0 that causes an unrecoverable
application error (UAE) if an MDI child window with scroll bars has
the WS_MAXIMIZE style. For more information, query on the words:
prod(winsdk) and ws_maximize
Additional reference words: 3.0