Microsoft KB Archive/163892

= A Service May Not Set Hooks on 32-bit GUI Applications =

Article ID: 163892

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT Server 4.0 Standard Edition

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This article was previously published under Q163892



SYMPTOMS
On a computer running Microsoft Windows NT 4.0, a Win32 Service cannot set a hook on a 32-bit GUI application.



CAUSE
When an interactive service wants to hook a user's process, it is not allowed to because the desktop opened does not have the DF_ALLOWOTHERACCOUNTHOOK flag set.



RESOLUTION
A fix was developed such that if "Allow Service to Interact with Desktop" is set, the service is allow to set hooks on a user's process. This fix requires Microsoft Windows NT version 4.0 Service Pack 2 to be installed.



STATUS
Microsoft has confirmed this to be a problem in Windows NT version 4.0. This problem was corrected in the latest Microsoft Windows NT 4.0 U.S. Service Pack. For information on obtaining the service pack, query on the following word in the Microsoft Knowledge Base (without the spaces):

S E R V P A C K

Keywords: kbbug kbprogramming KB163892

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