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Q69895: PRB: Activating Full-Screen DOS App from Icon in Enhanced Mode

Article: Q69895
Product(s): Microsoft Windows Software Development Kit
Version(s): WINDOWS:3.0,3.1
Operating System(s): 
Keyword(s): 
Last Modified: 06-NOV-1999

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The information in this article applies to:

- Microsoft Windows Software Development Kit (SDK) versions 3.0, 3.1 
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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.

Additional query words: 3.00 3.10

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Keywords          :  
Technology        : kbAudDeveloper kbWin3xSearch kbSDKSearch kbWinSDKSearch kbWinSDK300 kbWinSDK310
Version           : WINDOWS:3.0,3.1

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