Question

I’m using the function/message to check if the workstation is locked. Now my application is in the startup folder. It has worked without any problems on XP pro, but since I’m using the program on XP home WTSRegisterSessionNotification fails about 50% of the time on startup, but it never fails when the system is already booted up. Any idea why this could happen?

Answer 1

On XP, services start in the background and do not block boot or logon. The termsrv service is most likely not running by the time you call WTSRegisterSessionNotification.

You can check if the service is running by:

// Error handling omitted for brevity
SC_HANDLE scm = OpenSCManager(NULL, NULL, GENERIC_READ);
SC_HANDLE svc = OpenService(scm, L"TermSrv", SERVICE_QUERY_STATUS);
SERVICE_STATUS status;
QueryServiceStatus(svc, &status);
if (status.dwCurrentSTate != SERVICE_RUNNING) {
    // Try to start, wait and try again, etc.
}

CloseServiceHandle(svc);
CloseServiceHandle(scm);