使用IOCTL_SCSI_PASSTHROU 调用DeviceIoControl(),错误不知错在那里

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更多发布于：2005-07-07 19:01

  BCB6 环境下
目的是发送SCSI命令对设备进行读写
TCHAR *pname ="\\\\.\\USB#Vid_04cf&Pid_0809#100#{a5dcbf10-6530-11d2-901f-00c04fb951ed}";

HANDLE OpenCS881X( TCHAR *pname )//打开整个读卡器设备，非分区
{
   ////BOOL status = 0;
   DWORD dwAccessMode = 0, dwShareMode = 0;
   HANDLE fileHandle = NULL;

   dwShareMode = FILE_SHARE_READ | FILE_SHARE_WRITE; // default
   dwAccessMode = GENERIC_WRITE | GENERIC_READ; // default

   fileHandle = CreateFile( pname,
   dwAccessMode,
   dwShareMode,
   NULL,
   OPEN_EXISTING,
   0,
   NULL );

   if ( fileHandle == INVALID_HANDLE_VALUE )
   {
   return NULL;
   }

   return fileHandle;
}
//这个函数打开设备成功

BOOL SPTI_WriteBlock( HANDLE hFile,int nBytes, DWORD offset )
{
   ULONG length = 0;
   DWORD dwBytesReturned = 0;
   BOOL bResult = FALSE;

   ZeroMemory( &SPTWB, sizeof( SCSI_PASS_THROUGH_WITH_BUFFERS ) );

   SPTWB.spt.Length = sizeof( SCSI_PASS_THROUGH );
   SPTWB.spt.PathId = 0;
   SPTWB.spt.TargetId = 1;
   SPTWB.spt.Lun = 0;
   SPTWB.spt.CdbLength = CDB10_LENGTH;
   SPTWB.spt.SenseInfoLength = 0;
   SPTWB.spt.DataIn = SCSI_IOCTL_DATA_IN;
   SPTWB.spt.DataTransferLength = 0;
   SPTWB.spt.TimeOutValue = 2;
   SPTWB.spt.DataBufferOffset = offsetof( SCSI_PASS_THROUGH_WITH_BUFFERS,
   DataBuf );
   SPTWB.spt.SenseInfoOffset = 0;
   SPTWB.spt.Cdb[ 0 ] = WRITE_CMD;
   SPTWB.spt.Cdb[ 1 ] = 0x0;
   SPTWB.spt.Cdb[ 2 ] = HIBYTE(HIWORD(offset));
   SPTWB.spt.Cdb[ 3 ] = LOBYTE(HIWORD(offset));
   SPTWB.spt.Cdb[ 4 ] = HIBYTE(LOWORD(offset));
   SPTWB.spt.Cdb[ 5 ] = LOBYTE(LOWORD(offset));
   SPTWB.spt.Cdb[ 6 ] = 0x0;
   SPTWB.spt.Cdb[ 7 ] = 0x0;
   SPTWB.spt.Cdb[ 8 ] = 0x10;
   SPTWB.spt.Cdb[ 9 ] = 0x0;

   length = offsetof( SCSI_PASS_THROUGH_WITH_BUFFERS, DataBuf );

   bResult = DeviceIoControl( hFile, IOCTL_SCSI_PASS_THROUGH, &SPTWB, length,
   &SPTWB, length, &dwBytesReturned, FALSE );
   LAST_ERROR_CODE = GetLastError();
   if ( bResult == FALSE )
   {
   return FALSE;
   }
   else
   {
   return TRUE;
   }

   }
调用下边这个函数失败
DeviceIoControl()调用后返回失败，错误号为LAST_ERROR_CODE =50（不支持此请求---VC中的错误类型）

不知道那里问题，也不好调试
用BUSHOUND察看是找不到发出去的WRITE_CMD（应该就是原来那个数值巴？)

求教，该怎么办啊？

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