[求助]IO栈单元的问题~~

问题一：'PIO_STACK_LOCATION' : illegal use of this type as an expression（非法使用此类型表达式吧？可是我不清楚我下面的代码错编译错在哪~~）
NTSTATUS pnpdispatch(PDEVICE_OBJECT devobj,PIRP irp)
{
    Ptyf_dev_ext devext;
    NTSTATUS status=STATUS_SUCCESS;
    devext=(Ptyf_dev_ext)devobj->DeviceExtension;
    PIO_STACK_LOCATION irpstack;//主要问题是在这，问题一：
    irpstack=IoGetCurrentIrpStackLocation(irp);
    switch(irpstack->MinorFunction)
    {
        case IRP_MN_REMOVE_DEVICE:
        {
            IoSkipCurrentIrpStackLocation(irp);
            IoCallDriver(devext->attachedo,irp);
            KdPrint(("have device remove"));
            IoDetachDevice(devext->attachedo);
            IoDeleteDevice(devext->attachedo);
            break;
        }
        default:
        {
            IoSkipCurrentIrpStackLocation(irp);
            return IoCallDriver(devext->attachedo,irp);
        }
    }
    return status;
}
还有个问题：在DriverEntry主函数中，里面的一个IRP_MJ_READ功能码居然说未声明~~~还有PDRIVER_OBJECT类型 的变量在指向DriverUnLoad说没有这个成员~~？？

[ 本帖最后由 gpp6025 于 2010-8-19 08:30 编辑 ]