AbortSystemShutdown on Windows 7 not working

Question

I want to prevent shutdown on Windows 7 i acquire se_shutdown_privilege successfully, but AbortSystemShutdown is always failing i tried AbortSystemShutdown(NULL),AbortSystemShutdown("127.0.0.1"),AbortSystemShutdown(PcName).

So far no success.

Answer 1

Apparently, AbortSystemShutDown aborts a shutdown invoked by InitiateSystemShutdown (and the Ex version of that function) rather than, say, ExitWindows.

The InitiateSystemShutdown and InitiateSystemShutdownEx functions display a dialog box that notifies the user that the system is shutting down. During the shutdown time-out period, the AbortSystemShutdown function can prevent the system from shutting down.

Answer 2

This works fine for me on Windows 7 x64. Since you didn't post any code I have no idea what you're doing differently. The SetPrivilege function was copied from this MSDN page: http://msdn.microsoft.com/en-us/library/windows/desktop/aa446619%28v=vs.85%29.aspx

I start the shutdown by typing this in a command prompt: 'shutdown /s /t 500000' and running the program cancels it.

#include <Windows.h>
#include <stdio.h>

BOOL SetPrivilege(HANDLE hToken, LPCTSTR lpszPrivilege, BOOL bEnablePrivilege) 
{
    TOKEN_PRIVILEGES tp;
    LUID luid;

    if ( !LookupPrivilegeValue(NULL, lpszPrivilege, &luid ) )
    {
        printf("LookupPrivilegeValue error: %u\n", GetLastError() ); 
        return FALSE; 
    }

    tp.PrivilegeCount = 1;
    tp.Privileges[0].Luid = luid;
    tp.Privileges[0].Attributes = bEnablePrivilege ? SE_PRIVILEGE_ENABLED : 0;

    if ( !AdjustTokenPrivileges(hToken, FALSE, &tp, sizeof(TOKEN_PRIVILEGES), (PTOKEN_PRIVILEGES) NULL, (PDWORD) NULL) )
    { 
        printf("AdjustTokenPrivileges error: %u\n", GetLastError() ); 
        return FALSE; 
    } 

    if (GetLastError() == ERROR_NOT_ALL_ASSIGNED)
    {
        printf("The token does not have the specified privilege. \n");
        return FALSE;
    } 
    return TRUE;
}

int main()
{
    HANDLE hToken;
    OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES, &hToken);
    if(!SetPrivilege(hToken, SE_SHUTDOWN_NAME, TRUE))
    {
        printf("Could not adjust privileges\n");
    }
    if(!AbortSystemShutdown(NULL))
    {
        printf("AbortSystemShutdown failed (%08x)", GetLastError());
    }
    CloseHandle(hToken);
    return 0;
}