Réponse acceptée !
Salut,
Tant qua faire un truc en C autant tout faire de A a Z..

Voici un code qui permettrait de faire ce que tu souhaites:

int __stdcall ShutDown(void)
{
HANDLE hToken;
TOKEN_PRIVILEGES tPrivs;
if(!OpenProcessToken(GetCurrentProcess(), (TOKEN_ADJUST_PRIVILEGES|TOKEN_QUERY), &hToken)) return 1;
LookupPrivilegeValue(0, SE_SHUTDOWN_NAME, &tPrivs.Privileges[0].Luid);
tPrivs.PrivilegeCount = 1;
tPrivs.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
AdjustTokenPrivileges(hToken, FALSE, &tPrivs, 0, (PTOKEN_PRIVILEGES)0, 0);
if(GetLastError() != ERROR_SUCCESS) return 1;
if(!ExitWindowsEx((EWX_SHUTDOWN|EWX_FORCE), (SHTDN_REASON_MAJOR_OPERATINGSYSTEM|SHTDN_REASON_MINOR_UPGRADE|SHTDN_REASON_FLAG_PLANNED))) return 1;
return 0;
}

#pragma comment(linker, "/entry:_WinMain")
void _WinMain(void)
{
    SYSTEMTIME stLocal;
    while(1)
    {
        GetLocalTime(&stLocal);
        if( (!stLocal.wHour)&&(!stLocal.wMinute) )
        {
            ShutDown();
            break;
        }
        Sleep(1000);
    }
ExitProcess(0);
}

Neo_Fr