Re: How to display a message box from a COM+ server application configured as a non-interactive user?

From:
"Alex Blekhman" <xfkt@oohay.moc>
Newsgroups:
microsoft.public.vc.language
Date:
Thu, 5 Oct 2006 23:40:05 +0200
Message-ID:
<#7lASbM6GHA.2288@TK2MSFTNGP05.phx.gbl>
"Yuanming Chen" wrote:

I ran into a COM+ security problem when trying to display
a message box
inside a COM+ server application. The COM+ server
application was
configured to run under Administrator account. If I simply
call
"MessageBox()" API in the COM function, the window would
be invisible
since my dllhost.exe process creates a new winstation that
is different
from the WinSta0 interactive winstation.
[...]
I'd appreciate it if you can help pointing out a way to
allow a privilaged daemon process to directly interact
with the desktop
(not by talking to another interactive user process).


It is made that way for a good reason. By allowing access to
desktop from non-interactive service you compromise
security. This security breach was serious enough, so MS
made interraction between service and desktop disabled by
default in Windows versions prior to Vista. Starting with
Vista even this opportunity will gone. Why do you insist on
showing message box instead of writing error information in
system log?

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