Re: c# service unable to spawn exe

Im a bit upset because I'm running a service under WinXP SP2 and the
following code works quite fine to spawn another process (in this case it's
the service executable itself started as an isolated worker process
communicating with the service by serializing commands using standard input
and output):

// Create startup information
ProcessStartInfo pStart = new
ProcessStartInfo(Application.ExecutablePath, "AsChild");

// Use standard I/O
pStart.UseShellExecute = false;
pStart.RedirectStandardOutput = true;
pStart.RedirectStandardInput = true;

// Create new process
Process pNew = new Process();

// Attach
pNew.StartInfo = pStart;

// Activate it
pNew.Start();

Actually you should rethink the CreateNoWindow = False - maybe at least the
interactive access to desktop would be required. But question is: do you
really start the process with a GUI?

Jochen

"richie" <richardjneville@xxxxxxxxxxx> wrote in message
news:1161270595.351501.155030@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Thanks for the reply Michael

I also contacted Microsoft and they said:

System.Diagnostics.Process.Start is calling CreateProcessWithLogonW API
under the scenes. The behavior of this API has changed in Windows XP
SP2 and Windows Server 2003:

CreateProcessWithLogonW

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dllproc/base/createprocesswithlogonw.asp

"

Windows XP SP2 and Windows Server 2003: You cannot call
CreateProcessWithLogonW from a process that is running under the
LocalSystem account, because the function uses the logon SID in the
caller token, and the token for the LocalSystem account does not
contain this SID. As an alternative, use the CreateProcessAsUser and
LogonUser functions.

"




So basically starting a process from a c# service is not going to work
when running under the local system account, which I need to do cos
some users are restricted. I could use win32 via pinvoke to circumvent
this.

But I've decided to write the service in win32 and run the code as a
thread from the service. The exe I was running is c/c++ anyway so this
is easy.

If anyone is interested a good article for writing a win32 service is
http://www.commsoft.com/services.html

Thanks again

Cheers

Richard



.

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