Problem with InitiateSystemShutdown

I've been having trouble with the InitiateSystemShutdown function. It keeps returning a value of 0 (meaning that it failed). Here's the code I've been using.

InitiateSystemShutdown(NULL, NULL, 0, FALSE, TRUE)



I used GetLastError() to see whats going on, but theres no error number 6683144. Any ideas? Any help would be appreciated. Thanks.

Rich

You can use the below code to shut down the system
I stole the below code from MSDN library.

HANDLE hToken;
TOKEN_PRIVILEGES tkp;

// Get a token for this process.

if (!OpenProcessToken(GetCurrentProcess(),
TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hToken))
error("OpenProcessToken");

// Get the LUID for the shutdown privilege.

LookupPrivilegeValue(NULL, SE_SHUTDOWN_NAME,
&tkp.Privileges[0].Luid);

tkp.PrivilegeCount = 1; // one privilege to set
tkp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;

// Get the shutdown privilege for this process.

AdjustTokenPrivileges(hToken, FALSE, &tkp, 0,
(PTOKEN_PRIVILEGES)NULL, 0);

// Cannot test the return value of AdjustTokenPrivileges.

if (GetLastError() != ERROR_SUCCESS)
error("AdjustTokenPrivileges");

// Shut down the system and force all applications to close.

if (!ExitWindowsEx(EWX_SHUTDOWN | EWX_FORCE, 0))
error("ExitWindowsEx");
For more information about setting security privileges, see Privileges.

Problem: Process initiating shutdown without machine being logged on.

With the given solution, it is not possible for the process to initiate a shutdown if the machine is not logged on. How can a process which is started by a service at startup, initiate a shutdown without being logged on. Please note that the service starting this process has all administrative permissions.

Regards
krishnan