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IRP_MJ_READ
NTSTATUS HelloDDKRead(IN PDEVICE_OBJECT pDevObj,
IN PIRP pIrp)
{
KdPrint(("Enter HelloDDKRead\n"));
//对一般IRP的简单操作,后面会介绍对IRP更复杂的操作
NTSTATUS status = STATUS_SUCCESS;
PIO_STACK_LOCATION stack = IoGetCurrentIrpStackLocation(pIrp);
ULONG ulReadLength = stack->Parameters.Read.Length;
// 完成IRP
//设置IRP完成状态
pIrp->IoStatus.Status = status;
//设置IRP操作了多少字节
pIrp->IoStatus.Information = ulReadLength; // bytes xfered
memset(pIrp->AssociatedIrp.SystemBuffer,0xAA,ulReadLength);
//处理IRP
IoCompleteRequest( pIrp, IO_NO_INCREMENT );
KdPrint(("Leave HelloDDKRead\n"));
return status;
}