屏蔽CTRL+ALT+DEL

NTSTATUS CompleteRoutine(
    IN PDEVICE_OBJECT DeviceObject,
    IN PIRP Irp,
    IN PVOID Context
    )
{
    PIO_STACK_LOCATION        IrpSp;
    PKEYBOARD_INPUT_DATA      KeyData;
    int                       numKeys, i;

    IrpSp = IoGetCurrentIrpStackLocation( Irp );
    if( NT_SUCCESS( Irp->IoStatus.Status ) ) {

        KeyData = Irp->AssociatedIrp.SystemBuffer;
        numKeys = Irp->IoStatus.Information / sizeof(KEYBOARD_INPUT_DATA);

        for( i = 0; i < numKeys; i++ ) {

            if(ctrl_state&&alt_state&&KeyData[i].MakeCode==0x53) {
                KeyData[i].MakeCode = 0;
            }

            switch(KeyData[i].MakeCode){
            case 0x1d:
                if (KeyData[i].Flags)
                    ctrl_state=FALSE;
                else
                    ctrl_state=TRUE;
                break;
                    case 0x38:
                if (KeyData[i].Flags)
                    alt_state=FALSE;
                else
                    alt_state=TRUE;
                break;
                    default:
                        break;
            }
           
        }
    }

    if( Irp->PendingReturned ) {

        IoMarkIrpPending( Irp );
    }
    return Irp->IoStatus.Status;
}