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Problem spawning a regular win32 application from NT service

Posted on 1998-07-16
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Last Modified: 2013-11-20
Hello,

Using the sample code from "Creating a Simple Window NT Service in C++" by Nigel Thompson from Microsoft's technical article in the MSDN CDs, I created my own NT service that spawns another Win32 application called "ServerApp".  After the NT service starts,  the ServerApp is created using CreateProcess().

STARTUPINFO si;
PROCESS_INFORMATION pi;
ZeroMemory(&si, sizeof(si));
si.cb = sizeof(si);
CreateProcess(NULL, "C:\\ServerApp", NULL, NULL, FALSE,
                              0, NULL, NULL, &si, &pi);

However, for some reason, the ServeApp stays in a wait state and never completes the execution.  Even after the NT service is stopped, the ServeApp remains in the wait state.  I can't even kill the process.  How can I get the process to start?

Thanks,

Jennifer
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Question by:jli
7 Comments
 
LVL 7

Expert Comment

by:psdavis
ID: 1319343
Have you tried ShellExecute?

ShellExecute( this->GetSafeHwnd( ), "open", strEngine, NULL, strDirectory, SW_SHOWMINIMIZED );

Phillip

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Author Comment

by:jli
ID: 1319344
In NT Service, there is no Windows handle associated with the process.
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LVL 8

Expert Comment

by:trestan
ID: 1319345
There is no problem in the codes you listed here. Would you provide more information about the case? Did you debug your code to see where the program blocked? Or email me your codes: trestan@hotmail.com
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LVL 1

Expert Comment

by:Rajkumar_R
ID: 1319346
I think the problem must be in your other exe ServerApp
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Expert Comment

by:ahomer
ID: 1319347
try using  ---

if(::CreateProcess(NULL, "C:\\ServerApp", NULL, NULL, FALSE,
0, NULL, NULL, &si, &pi)){
   ::CloseHandle (pi.hThread);
   ::CloseHandle (pi.hProcess);
}            

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Accepted Solution

by:
Tommy Hui earned 100 total points
ID: 1319348
Your problem does not come from CreateProcess, but from the special environment of services. Take a look at this URL for a more complete discussion of the problem.

http://www.microsoft.com/msj/0398/service2.htm


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Author Comment

by:jli
ID: 1319349
Thank you.
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