设备读写方式

1.缓冲区方式读写操作

1.1 ReadFile 

  读取字节数:stack->Parameters.Read.Length

   偏移:stack->Parameters.Read.ByteOffset.QuadPart

  输出缓冲区:pIrp->AssociatedIrp.SystemBuffer

  输出字节数:pIrp->IoStatus.Information

 

1.2 WriteFile

  写入字节数:stack->Parameters.Write.Length

   偏移:stack->Parameters.Write.ByteOffset.QuadPart

  写入缓冲区:pIrp->AssociatedIrp.SystemBuffer

  返回字节数:pIrp->IoStatus.Information

 

1.3 IRP_MJ_QUERY_INFORMATION

  FILE_INFORMATION_CLASS: stack->Parameters.QueryFile.FileInformation

  输入输出缓冲区:pIrp->AssociatedIrp.SystemBuffer

      返回字节数:pIrp->IoStatus.Information=stack->Parameters.QueryFile.Length

 

2.直接方式读写操作

2.1 ReadFile

  读取字节数:stack->Parameters.Read.Length

   偏移:stack->Parameters.Read.ByteOffset.QuadPart

  输出缓冲区:MmGetSystemAddressForMdlSafe(pIrp->MdlAddress,NormalPagePriority)

  输出字节数:pIrp->IoStatus.Information

 

2.2 WriteFile

  写入字节数:stack->Parameters.Write.Length

   偏移:stack->Parameters.Write.ByteOffset.QuadPart

  写入缓冲区:MmGetSystemAddressForMdlSafe(pIrp->MdlAddress,NormalPagePriority)

  返回字节数:pIrp->IoStatus.Information

 

3.其他方式读写操作

3.1 ReadFile

  读取字节数:stack->Parameters.Read.Length

   偏移:stack->Parameters.Read.ByteOffset.QuadPart

  输出缓冲区:ProbeForWrite(pIrp->UserBuffer)

  输出字节数:pIrp->IoStatus.Information

 

3.2 WriteFile

  写入字节数:stack->Parameters.Write.Length

   偏移:stack->Parameters.Write.ByteOffset.QuadPart

  写入缓冲区:ProbeForRead(pIrp->UserBuffer)

  返回字节数:pIrp->IoStatus.Information

 

 

IO设备控制操作

1.缓冲内存模式IOCTL

 

输入缓冲区大小:stack->Parameters.DeviceIoControl.InputBufferLength

输出缓冲区大小:stack->Parameters.DeviceIoControl.OutputBufferLength

    输入缓冲区:pIrp->AssociatedIrp.SystemBuffer

    输出缓冲区:pIrp->AssociatedIrp.SystemBuffer

 

2.直接内存模式IOCTL之METHOD_IN_DIRECT 

 

输入缓冲区大小:stack->Parameters.DeviceIoControl.InputBufferLength

输出缓冲区大小:stack->Parameters.DeviceIoControl.OutputBufferLength

    输入缓冲区:MmGetSystemAddressForMdlSafe(pIrp->MdlAddress,NormalPagePriority)

    输出缓冲区:pIrp->AssociatedIrp.SystemBuffer

 

 

3.直接内存模式IOCTL之METHOD_OUT_DIRECT 

 

输入缓冲区大小:stack->Parameters.DeviceIoControl.InputBufferLength

输出缓冲区大小:stack->Parameters.DeviceIoControl.OutputBufferLength

    输入缓冲区:MmGetSystemAddressForMdlSafe(pIrp->MdlAddress,NormalPagePriority)

    输出缓冲区:pIrp->AssociatedIrp.SystemBuffer

 

METHOD_IN_DIRECT与METHOD_OUT_DIRECT区别在于打开设备的权限

 

1) 只读权限打开设备，METHOD_IN_DIRECT的IOCTL操作成功，而METHOD_OUT_DIRECT的操作失败

2) 读写权限打开设备，METHOD_IN_DIRECT与METHOD_OUT_DIRECT的IOCTL操作都成功

 

4.其他内存模式IOCTL

 

输入缓冲区大小:stack->Parameters.DeviceIoControl.InputBufferLength

输出缓冲区大小:stack->Parameters.DeviceIoControl.OutputBufferLength

    输入缓冲区:ProbeForRead(stack->Parameters.DeviceIoControl.Type3InputBuffer)

    输出缓冲区:ProbeForWrite(pIrp->UserBuffer)