PRB: Activating Full-Screen DOS App from Icon in Enhanced Mode (69895)
The information in this article applies to:
- Microsoft Windows Software Development Kit (SDK) 3.0
- Microsoft Windows Software Development Kit (SDK) 3.1
This article was previously published under Q69895 SYMPTOMS
In Microsoft Windows enhanced mode, when an application calls the OpenIcon
or ShowWindows functions to activate a full-screen MS-DOS application from
an icon, the activation fails. These functions perform as documented in
real and standard mode.
RESOLUTION
To avoid this problem, simulate the result of an ALT+TAB key combination on
the MS-DOS application icon: Send a WM_ACTIVATE message to the MS-DOS
application, and then specify its handle in a call to ShowWindow function.
For example:
SendMessage(hDOSApp, WM_ACTIVATE, 1, MAKELONG(hDOSApp, TRUE));
ShowWindow(hDOSApp, SW_SHOWNORMAL);
When the application sends the WM_ACTIVATE message, wParam is set to 1
because the application is being invoked by simulating the keyboard. The
high-order word of lParam is set to TRUE (non-zero) because the MS-DOS
application is represented by an icon.
The method works in all three Windows modes for windowed and full-
screen MS-DOS applications.
| Modification Type: | Major | Last Reviewed: | 10/29/2003 |
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| Keywords: | KB69895 |
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