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How to use the DataBuffer of SCSI_PASS_THROUGH_DIRECT in c# ?
Hi All; I need to send a READ command to CD-ROM drive by SCSI_PASS_THROUGH_DIRECT.
int inputSize = Marshal.SizeOf(typeof(SCSI_PASS_THROUGH_WITH_BUFFERS));
IntPtr input = Marshal.AllocHGlobal(inputSize);
Marshal.StructureToPtr(sptdwb, input, true)
In my code, the Marshal.StructureToPtr(sptdwb, input, true) will return
error, because the sptdwb and input size are not equal, then the PVOID
DataBuffer can't be access.
Do you have any ideas ?
Sorry, modify some message. I need to send a READ command to CD-ROM drive by SCSI_PASS_THROUGH_DIRECT.
As SCSI_PASS_THROUGH_DIRECT struct:
typedef struct _SCSI_PASS_THROUGH_DIRECT {
USHORT Length;
UCHAR ScsiStatus;
UCHAR PathId;
UCHAR TargetId;
UCHAR Lun;
UCHAR CdbLength;
UCHAR SenseInfoLength;
UCHAR DataIn;
ULONG DataTransferLength;
ULONG TimeOutValue;
PVOID DataBuffer;
ULONG SenseInfoOffset;
UCHAR Cdb[16];
}SCSI_PASS_THROUGH_DIRECT, *PSCSI_PASS_THROUGH_DIRECT;
int inputSize = Marshal.SizeOf(typeof(SCSI_PASS_THROUGH_WITH_BUFFERS)); IntPtr input = Marshal.AllocHGlobal(inputSize); Marshal.StructureToPtr(sptdwb, input, true) In my code, the Marshal.StructureToPtr(sptdwb, input, true) will return
error, because I need to modify the DataBuffer size for each command, the
sptdwb and input size will not equal, then the PVOID DataBuffer can't be
access.
Do you have any ideas ?
Thank you for your help !!
-----------------------------------------------Reply-----------------------------------------------
"Marce" <u34601@uwe> wrote in message news:72e367ac5a552@uwe... > Sorry, modify some message. > I need to send a READ command to CD-ROM drive by
> SCSI_PASS_THROUGH_DIRECT.
> As SCSI_PASS_THROUGH_DIRECT struct:
> typedef struct _SCSI_PASS_THROUGH_DIRECT {
> USHORT Length;
> UCHAR ScsiStatus;
> UCHAR PathId;
> UCHAR TargetId;
> UCHAR Lun;
> UCHAR CdbLength;
> UCHAR SenseInfoLength;
> UCHAR DataIn;
> ULONG DataTransferLength;
> ULONG TimeOutValue;
> PVOID DataBuffer;
> ULONG SenseInfoOffset;
> UCHAR Cdb[16];
> }SCSI_PASS_THROUGH_DIRECT, *PSCSI_PASS_THROUGH_DIRECT;
> int inputSize = Marshal.SizeOf(typeof(SCSI_PASS_THROUGH_WITH_BUFFERS));
> IntPtr input = Marshal.AllocHGlobal(inputSize);
> Marshal.StructureToPtr(sptdwb, input, true)
> In my code, the Marshal.StructureToPtr(sptdwb, input, true) will return
> error, because I need to modify the DataBuffer size for each command, the
> sptdwb and input size will not equal, then the PVOID DataBuffer can't be
> access.
> Do you have any ideas ?
> Thank you for your help !!
We need your SCSI_PASS_THROUGH_DIRECT structure declaration in C# to help you with this. Willy.
-----------------------------------------------Reply-----------------------------------------------
Willy Denoyette [MVP] wrote: >> Sorry, modify some message. >[quoted text clipped - 30 lines]
>> Thank you for your help !!
>We need your SCSI_PASS_THROUGH_DIRECT structure declaration in C# to help
>you with this.
>Willy.
Thank you Willy! [StructLayout(LayoutKind.Sequential)]
class SCSI_PASS_THROUGH_DIRECT
{
public UInt16 Length = (UInt16)Marshal.SizeOf(typeof
(SCSI_PASS_THROUGH_DIRECT));
public byte ScsiStatus = 0;
public byte PathId= 0;
public byte TargetId= 0;
public byte Lun = 0;
public byte CdbLength = 12;
public byte SenseInfoLength = 24;
public byte DataIn ;
public Int32 DataTransferLength;
public Int32 TimeOutValue= 30;
public IntPtr DataBuffer;
public UInt32 SenseInfoOffset = (UInt32)Marshal.OffsetOf(typeof
(SCSI_PASS_THROUGH_WITH_BUFFERS), "ucSenseBuf");
[MarshalAs(UnmanagedType.ByValArray,SizeConst = 16)]
public byte[] Cdb = new byte[16];
}
FYI.
--
Message posted via DotNetMonster.com
http://www.dotnetmonster.com/Uwe/Forums.aspx/dotnet-csharp/200705/1
-----------------------------------------------Reply-----------------------------------------------
Marce wrote: >>> Sorry, modify some message. >[quoted text clipped - 6 lines]
>>Willy.
>Thank you Willy!
>[StructLayout(LayoutKind.Sequential)]
> class SCSI_PASS_THROUGH_DIRECT
> {
> public UInt16 Length = (UInt16)Marshal.SizeOf(typeof
>(SCSI_PASS_THROUGH_DIRECT));
> public byte ScsiStatus = 0;
> public byte PathId= 0;
> public byte TargetId= 0;
> public byte Lun = 0;
> public byte CdbLength = 12;
> public byte SenseInfoLength = 24;
> public byte DataIn ;
> public Int32 DataTransferLength;
> public Int32 TimeOutValue= 30;
> public IntPtr DataBuffer;
> public UInt32 SenseInfoOffset = (UInt32)Marshal.OffsetOf(typeof
>(SCSI_PASS_THROUGH_DIRECT_WITH_BUFFERS), "ucSenseBuf");
> [MarshalAs(UnmanagedType.ByValArray,SizeConst = 16)]
> public byte[] Cdb = new byte[16];
> }
>FYI.
-- Message posted via DotNetMonster.com http://www.dotnetmonster.com/Uwe/Forums.aspx/dotnet-csharp/200705/1 -----------------------------------------------Reply-----------------------------------------------
Sorry, modify some error message ! [StructLayout(LayoutKind.Sequential)]
class SCSI_PASS_THROUGH_DIRECT
{
public UInt16 Length = (UInt16)Marshal.SizeOf(typeof
(SCSI_PASS_THROUGH_DIRECT));
public byte ScsiStatus = 0;
public byte PathId= 0;
public byte TargetId= 0;
public byte Lun = 0;
public byte CdbLength = 12;
public byte SenseInfoLength = 24;
public byte DataIn ;
public Int32 DataTransferLength;
public Int32 TimeOutValue= 30;
public IntPtr DataBuffer;
public UInt32 SenseInfoOffset = (UInt32)Marshal.OffsetOf(typeof
(SCSI_PASS_THROUGH_DIRECT_WITH_BUFFERS), "ucSenseBuf");
[MarshalAs(UnmanagedType.ByValArray,SizeConst = 16)]
public byte[] Cdb = new byte[16];
}
--
Message posted via DotNetMonster.com
http://www.dotnetmonster.com/Uwe/Forums.aspx/dotnet-csharp/200705/1
-----------------------------------------------Reply-----------------------------------------------
"Marce via DotNetMonster.com" <u34601@uwe> wrote in message news:72e5d0179de3d@uwe...
> Sorry, modify some error message ! > [StructLayout(LayoutKind.Sequential)]
> class SCSI_PASS_THROUGH_DIRECT
> {
> public UInt16 Length = (UInt16)Marshal.SizeOf(typeof
> (SCSI_PASS_THROUGH_DIRECT));
> public byte ScsiStatus = 0;
> public byte PathId= 0;
> public byte TargetId= 0;
> public byte Lun = 0;
> public byte CdbLength = 12;
> public byte SenseInfoLength = 24;
> public byte DataIn ;
> public Int32 DataTransferLength;
> public Int32 TimeOutValue= 30;
> public IntPtr DataBuffer;
> public UInt32 SenseInfoOffset = (UInt32)Marshal.OffsetOf(typeof
> (SCSI_PASS_THROUGH_DIRECT_WITH_BUFFERS), "ucSenseBuf");
> [MarshalAs(UnmanagedType.ByValArray,SizeConst = 16)]
> public byte[] Cdb = new byte[16];
> }
> --
> Message posted via DotNetMonster.com
> http://www.dotnetmonster.com/Uwe/Forums.aspx/dotnet-csharp/200705/1
You have to take care that you pass a correctly filled and aligned structure, the buffers need to be fields in the same marshaled structure (here SCSI_PASS_THROUGH_WITH_BUFFERS). Here is how you could declare the structure and the
SCSI_PASS_THROUGH_WITH_BUFFERS class.
[StructLayout(LayoutKind.Sequential)]
struct SCSI_PASS_THROUGH_DIRECT
{
public short Length;
public byte ScsiStatus;
public byte PathId;
public byte TargetId;
public byte Lun;
public byte CdbLength;
public byte SenseInfoLength;
public byte DataIn ;
public int DataTransferLength;
public int TimeOutValue;
public IntPtr DataBufferOffset;
public uint SenseInfoOffset;
[MarshalAs(UnmanagedType.ByValArray,SizeConst = 16)]
public byte[] Cdb;
};
[StructLayout(LayoutKind.Sequential)]
class SCSI_PASS_THROUGH_WITH_BUFFERS
{
internal SCSI_PASS_THROUGH_DIRECT sptd = new SCSI_PASS_THROUGH_DIRECT();
// // adapt size to suit your needs!!!!!!
[MarshalAs(UnmanagedType.ByValArray,SizeConst = 18)]
internal byte[] sense ;
// adapt to suit your needs!!!!!!!
[MarshalAs(UnmanagedType.ByValArray,SizeConst = 36)]
internal byte[] data ;
};
// usage ...
SCSI_PASS_THROUGH_WITH_BUFFERS info = new
SCSI_PASS_THROUGH_WITH_BUFFERS();
info.sptd.Cdb = new byte[16];
info.sense = new byte[18]; // adapt to suit your needs!!!!!!
info.data = new byte[36]; // adapt to suit your needs!!!!!!
info.sptd.Length = (short)Marshal.SizeOf(info.sptd);
info.sptd.SenseInfoOffset =
(uint)Marshal.OffsetOf(typeof(SCSI_PASS_THROUGH_WITH_BUFFERS), "sense");
info.sptd.SenseInfoLength = (byte)info.sense.Length;
info.sptd.DataTransferLength = info.data.Length;
info.sptd.DataBufferOffset =
Marshal.OffsetOf(typeof(SCSI_PASS_THROUGH_WITH_BUFFERS), "data");
info.sptd.TimeOutValue = 30;
info.sptd.DataIn = SCSI_IOCTL_DATA_IN;
// initilalize the cdb
info.sptd.CdbLength = x; // length of CDB
info.sptd.Cdb[0] = ...;
....
IntPtr inpBuffer = Marshal.AllocHGlobal(Marshal.SizeOf(info));
Marshal.StructureToPtr(info, inpBuffer, false);
// call DeviceIoControl passing the buffer inpBuffer as inp buffer
and/or output buffer depending on the command.
int ret = DeviceIoControl(...., inpBuffer, Marshal.SizeOf(info), ...);
...
Willy.
-----------------------------------------------Reply-----------------------------------------------
Willy Denoyette [MVP] wrote: >> Sorry, modify some error message ! >[quoted text clipped - 19 lines]
>> public byte[] Cdb = new byte[16];
>> }
>You have to take care that you pass a correctly filled and aligned
>structure, the buffers need to be fields in the same marshaled structure
>(here SCSI_PASS_THROUGH_WITH_BUFFERS).
>Here is how you could declare the structure and the
>SCSI_PASS_THROUGH_WITH_BUFFERS class.
> [StructLayout(LayoutKind.Sequential)]
> struct SCSI_PASS_THROUGH_DIRECT
> {
> public short Length;
> public byte ScsiStatus;
> public byte PathId;
> public byte TargetId;
> public byte Lun;
> public byte CdbLength;
> public byte SenseInfoLength;
> public byte DataIn ;
> public int DataTransferLength;
> public int TimeOutValue;
> public IntPtr DataBufferOffset;
> public uint SenseInfoOffset;
> [MarshalAs(UnmanagedType.ByValArray,SizeConst = 16)]
> public byte[] Cdb;
> };
> [StructLayout(LayoutKind.Sequential)]
> class SCSI_PASS_THROUGH_WITH_BUFFERS
> {
> internal SCSI_PASS_THROUGH_DIRECT sptd = new SCSI_PASS_THROUGH_DIRECT();
> // // adapt size to suit your needs!!!!!!
> [MarshalAs(UnmanagedType.ByValArray,SizeConst = 18)]
> internal byte[] sense ;
> // adapt to suit your needs!!!!!!!
> [MarshalAs(UnmanagedType.ByValArray,SizeConst = 36)]
> internal byte[] data ;
> };
>// usage ...
> SCSI_PASS_THROUGH_WITH_BUFFERS info = new
>SCSI_PASS_THROUGH_WITH_BUFFERS();
> info.sptd.Cdb = new byte[16];
> info.sense = new byte[18]; // adapt to suit your needs!!!!!!
> info.data = new byte[36]; // adapt to suit your needs!!!!!!
> info.sptd.Length = (short)Marshal.SizeOf(info.sptd);
> info.sptd.SenseInfoOffset =
>(uint)Marshal.OffsetOf(typeof(SCSI_PASS_THROUGH_WITH_BUFFERS), "sense");
> info.sptd.SenseInfoLength = (byte)info.sense.Length;
> info.sptd.DataTransferLength = info.data.Length;
> info.sptd.DataBufferOffset =
>Marshal.OffsetOf(typeof(SCSI_PASS_THROUGH_WITH_BUFFERS), "data");
> info.sptd.TimeOutValue = 30;
> info.sptd.DataIn = SCSI_IOCTL_DATA_IN;
>// initilalize the cdb
> info.sptd.CdbLength = x; // length of CDB
> info.sptd.Cdb[0] = ...;
> ....
> IntPtr inpBuffer = Marshal.AllocHGlobal(Marshal.SizeOf(info));
> Marshal.StructureToPtr(info, inpBuffer, false);
> // call DeviceIoControl passing the buffer inpBuffer as inp buffer
>and/or output buffer depending on the command.
> int ret = DeviceIoControl(...., inpBuffer, Marshal.SizeOf(info), ...);
>...
>Willy.
Thanks Willy. It works ok by SCSI_PASS_THROUGH_WITH_BUFFERS, and the data buffer size need
to fixed.
As this:
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 30*2048)]
public byte[] ucDataBuf = new byte[30 * 2048];
But In the SCSI_PASS_THROUGH_DIRECT_BUFFERS structure, the DataBuffer is
IntPtr point.
How can I send a ATAPI cmd with databuffer by
SCSI_PASS_THROUGH_DIRECT_BUFFERS ?
--
Message posted via http://www.dotnetmonster.com
-----------------------------------------------Reply-----------------------------------------------
"Marce via DotNetMonster.com" <u34601@uwe> wrote in message news:72f0129368a0e@uwe...
> Willy Denoyette [MVP] wrote: >>> Sorry, modify some error message ! >>[quoted text clipped - 19 lines]
>>> public byte[] Cdb = new byte[16];
>>> }
>>You have to take care that you pass a correctly filled and aligned
>>structure, the buffers need to be fields in the same marshaled structure
>>(here SCSI_PASS_THROUGH_WITH_BUFFERS).
>>Here is how you could declare the structure and the
>>SCSI_PASS_THROUGH_WITH_BUFFERS class.
>> [StructLayout(LayoutKind.Sequential)]
>> struct SCSI_PASS_THROUGH_DIRECT
>> {
>> public short Length;
>> public byte ScsiStatus;
>> public byte PathId;
>> public byte TargetId;
>> public byte Lun;
>> public byte CdbLength;
>> public byte SenseInfoLength;
>> public byte DataIn ;
>> public int DataTransferLength;
>> public int TimeOutValue;
>> public IntPtr DataBufferOffset;
>> public uint SenseInfoOffset;
>> [MarshalAs(UnmanagedType.ByValArray,SizeConst = 16)]
>> public byte[] Cdb;
>> };
>> [StructLayout(LayoutKind.Sequential)]
>> class SCSI_PASS_THROUGH_WITH_BUFFERS
>> {
>> internal SCSI_PASS_THROUGH_DIRECT sptd = new SCSI_PASS_THROUGH_DIRECT();
>> // // adapt size to suit your needs!!!!!!
>> [MarshalAs(UnmanagedType.ByValArray,SizeConst = 18)]
>> internal byte[] sense ;
>> // adapt to suit your needs!!!!!!!
>> [MarshalAs(UnmanagedType.ByValArray,SizeConst = 36)]
>> internal byte[] data ;
>> };
>>// usage ...
>> SCSI_PASS_THROUGH_WITH_BUFFERS info = new
>>SCSI_PASS_THROUGH_WITH_BUFFERS();
>> info.sptd.Cdb = new byte[16];
>> info.sense = new byte[18]; // adapt to suit your needs!!!!!!
>> info.data = new byte[36]; // adapt to suit your needs!!!!!!
>> info.sptd.Length = (short)Marshal.SizeOf(info.sptd);
>> info.sptd.SenseInfoOffset =
>>(uint)Marshal.OffsetOf(typeof(SCSI_PASS_THROUGH_WITH_BUFFERS), "sense");
>> info.sptd.SenseInfoLength = (byte)info.sense.Length;
>> info.sptd.DataTransferLength = info.data.Length;
>> info.sptd.DataBufferOffset =
>>Marshal.OffsetOf(typeof(SCSI_PASS_THROUGH_WITH_BUFFERS), "data");
>> info.sptd.TimeOutValue = 30;
>> info.sptd.DataIn = SCSI_IOCTL_DATA_IN;
>>// initilalize the cdb
>> info.sptd.CdbLength = x; // length of CDB
>> info.sptd.Cdb[0] = ...;
>> ....
>> IntPtr inpBuffer = Marshal.AllocHGlobal(Marshal.SizeOf(info));
>> Marshal.StructureToPtr(info, inpBuffer, false);
>> // call DeviceIoControl passing the buffer inpBuffer as inp buffer
>>and/or output buffer depending on the command.
>> int ret = DeviceIoControl(...., inpBuffer, Marshal.SizeOf(info), ...);
>>...
>>Willy.
> Thanks Willy.
> It works ok by SCSI_PASS_THROUGH_WITH_BUFFERS, and the data buffer size
> need
> to fixed.
> As this:
> [MarshalAs(UnmanagedType.ByValArray, SizeConst = 30*2048)]
> public byte[] ucDataBuf = new byte[30 * 2048];
> But In the SCSI_PASS_THROUGH_DIRECT_BUFFERS structure, the DataBuffer is
> IntPtr point.
> How can I send a ATAPI cmd with databuffer by
> SCSI_PASS_THROUGH_DIRECT_BUFFERS ?
> --
> Message posted via http://www.dotnetmonster.com
Ok, if you need to pass such large buffers you will have to use the IOCTL_SCSI_PASS_THROUGH_DIRECT ioctl command and define your structures as follows: [StructLayout(LayoutKind.Sequential)]
struct SCSI_PASS_THROUGH_DIRECT
{
public short Length;
public byte ScsiStatus;
public byte PathId;
public byte TargetId;
public byte Lun;
public byte CdbLength;
public byte SenseInfoLength;
public byte DataIn ;
public int DataTransferLength;
public int TimeOutValue;
public IntPtr DataBuffer; // note this is now interpreted as a
pointer, not an offset!!
public uint SenseInfoOffset;
[MarshalAs(UnmanagedType.ByValArray,SizeConst = 16)]
public byte[] Cdb;
};
[StructLayout(LayoutKind.Sequential)]
class SCSI_PASS_THROUGH_DIRECT_WITH_BUFFERS
{
internal SCSI_PASS_THROUGH_DIRECT sptd = new SCSI_PASS_THROUGH_DIRECT();
[MarshalAs(UnmanagedType.ByValArray,SizeConst = 18)]
internal byte[] sense ;
};
in your code, you'll have to allocate the data buffer like this:
SCSI_PASS_THROUGH_DIRECT_WITH_BUFFERS info = new
SCSI_PASS_THROUGH_DIRECT_WITH_BUFFERS();
...
info.sptd.DataBuffer = Marshal.AllocHGlobal(30 * 2048); // allocate
correctly aligned buffer
marshal the data to/from the buffer using Marshal.Copy, and...
use the IOCTL_SCSI_PASS_THROUGH_DIRECT command in the call to the
DeviceIOControl API like this:
const int IOCTL_SCSI_PASS_THROUGH_DIRECT = 0x4D014; // IOCTL cmd
...
DeviceIoControl(fh, IOCTL_SCSI_PASS_THROUGH_DIRECT,....
don't forget to Marshal.FreeHGlobal when done with the unmanaged buffer!!
Willy.
-----------------------------------------------Reply-----------------------------------------------
Dear Willy: Thank you for your help! This help me more !
Willy Denoyette [MVP] wrote: >>>> Sorry, modify some error message ! >[quoted text clipped - 83 lines]
>> How can I send a ATAPI cmd with databuffer by
>> SCSI_PASS_THROUGH_DIRECT_BUFFERS ?
>Ok, if you need to pass such large buffers you will have to use the
>IOCTL_SCSI_PASS_THROUGH_DIRECT ioctl command and define your structures as
>follows:
> [StructLayout(LayoutKind.Sequential)]
> struct SCSI_PASS_THROUGH_DIRECT
> {
> public short Length;
> public byte ScsiStatus;
> public byte PathId;
> public byte TargetId;
> public byte Lun;
> public byte CdbLength;
> public byte SenseInfoLength;
> public byte DataIn ;
> public int DataTransferLength;
> public int TimeOutValue;
> public IntPtr DataBuffer; // note this is now interpreted as a
>pointer, not an offset!!
> public uint SenseInfoOffset;
> [MarshalAs(UnmanagedType.ByValArray,SizeConst = 16)]
> public byte[] Cdb;
> };
> [StructLayout(LayoutKind.Sequential)]
> class SCSI_PASS_THROUGH_DIRECT_WITH_BUFFERS
> {
> internal SCSI_PASS_THROUGH_DIRECT sptd = new SCSI_PASS_THROUGH_DIRECT();
> [MarshalAs(UnmanagedType.ByValArray,SizeConst = 18)]
> internal byte[] sense ;
> };
>in your code, you'll have to allocate the data buffer like this:
>SCSI_PASS_THROUGH_DIRECT_WITH_BUFFERS info = new
>SCSI_PASS_THROUGH_DIRECT_WITH_BUFFERS();
>...
>info.sptd.DataBuffer = Marshal.AllocHGlobal(30 * 2048); // allocate
>correctly aligned buffer
>marshal the data to/from the buffer using Marshal.Copy, and...
>use the IOCTL_SCSI_PASS_THROUGH_DIRECT command in the call to the
>DeviceIOControl API like this:
>const int IOCTL_SCSI_PASS_THROUGH_DIRECT = 0x4D014; // IOCTL cmd
>...
>DeviceIoControl(fh, IOCTL_SCSI_PASS_THROUGH_DIRECT,....
>don't forget to Marshal.FreeHGlobal when done with the unmanaged buffer!!
>Willy.
-- Message posted via DotNetMonster.com http://www.dotnetmonster.com/Uwe/Forums.aspx/dotnet-csharp/200705/1
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