const int BOOT_NORMAL= 0;
const int BOOT_SAFE = 1;
const int BOOT_SAFE_NET = 2;
// Get how the system started
int iRet = GetSystemMetrics(SM_CLEANBOOT)
switch(iRet)
{
case BOOT_NORMAL:
// Normal boot
break;
case BOOT_SAFE:
// Fail-safe boot(SafeBoot, Safe Mode, Clean Boot)
break;
case BOOT_SAFE_NET:
// Fail-safe with network boot
break;
}