NtDoc

No description available.

Windows Driver Kit DDI reference (ni-scsiscan-ioctl_scsiscan_cmd)

IOCTL_SCSISCAN_CMD IOCTL

Description

Creates a customized SCSI control descriptor block (CDB) and sends it to the kernel-mode still image driver for SCSI buses.

Parameters

Major code

Input buffer

Pointer to a SCSISCAN_CMD structure.

Input buffer length

Size of the input buffer.

Output buffer

Pointer to a data buffer. Depending on the type of I/O operation, this buffer might supply or receive data.

Output buffer length

Size of the output buffer.

Input/output buffer

Input/output buffer length

Status block

Irp->IoStatus.Status is set to STATUS_SUCCESS if the request is successful. Otherwise, Status to the appropriate error condition as a NTSTATUS code.

Remarks

When the DeviceloControl function is called with the IOCTL_SCSISCAN_CMD I/O control code, the caller must specify the address of a SCSISCAN_CMD structure as the function's lpInBuffer parameter. This structure specifies the type of operation being requested. The kernel-mode driver constructs a SCSI Request Block (SRB) from the SCSISCAN_CMD structure's contents.

For SCSI commands that involve data transfers, the DeviceIoControl function's lpOutBuffer must point to a data buffer. For read operations, this buffer will receive data read from the device. For write operations, the buffer must contain the data to be written.

For more information, see Accessing Kernel-Mode Drivers for Still Image Devices.

Code example

SCSISCAN_CMD  Cmd;
UCHAR         SrbStatus;

// Construct the SCSISCAN_CMD structure and
// clear out the sense buffer.
memset(&Cmd, 0, sizeof(Cmd));
memset(SenseBuffer,0, sizeof(SenseBuffer));

Cmd.Size = sizeof(SCSISCAN_CMD);
Cmd.SrbFlags = SRB_FLAGS_DATA_OUT;
Cmd.CdbLength = 6;
Cmd.SenseLength = 18;
Cmd.TransferLength = len;
Cmd.pSrbStatus = &SrbStatus;
Cmd.pSenseBuffer = SenseBuffer;

Cmd.Cdb[0] = 0x0A;
Cmd.Cdb[4] = ((PFOUR_BYTE)&len) -> Byte0;
Cmd.Cdb[3] = ((PFOUR_BYTE)&len) -> Byte1;
Cmd.Cdb[2] = ((PFOUR_BYTE)&len) -> Byte2;
Cmd.Cdb[5] = 0;

DeviceIoControl(
           gb_Scan_Handle,
           (DWORD) IOCTL_SCSISCAN_CMD,
           &Cmd,
           sizeof(Cmd),
           buf,
           len,
           amount_written_ptr,
           NULL
           );

if (SRB_STATUS_SUCCESS != SRB_STATUS(SrbStatus))
{
  fprintf(stderr, "WriteScanner error.\n");
  if (SRB_STATUS_DATA_OVERRUN == SrbStatus)
  {
    fprintf(stderr, "Data over/under run. This is ok.\n");
  }
  else if ((SenseBuffer[2] & 0xf) == SCSI_SENSE_UNIT_ATTENTION)
  {
    fprintf(stderr, "Unit attention.  Retrying request....\n");
    memset(SenseBuffer,0, sizeof(SenseBuffer));
    SrbStatus = 0;
    DeviceIoControl(
      gb_Scan_Handle,
      (DWORD) IOCTL_SCSISCAN_CMD,
      &Cmd,
      sizeof(Cmd),
      buf,
      len,
      amount_written_ptr,
      NULL
      );
    }
  }
}

IOCTL_SCSISCAN_CMD - NtDoc