关于C++ 使用ASPI 向光驱发送SCSI命令遇到的问题

奔跑的大象 2013-07-18 03:26:51

先贴代码
这段代码是获取硬件类型为CDROM的硬件名称，

BYTE __fastcall getDriveName( BYTE hostadapter, BYTE target, char* stringbuffer )

{

	SRB_ExecSCSICmd s;

	BYTE buf[100];



	memset( &s, 0, sizeof( s ) );

	memset( buf, 0, 100 );



	s.SRB_Cmd        = SC_EXEC_SCSI_CMD;

	s.SRB_HaId       = hostadapter;

	s.SRB_Target     = target;

	s.SRB_Lun        = 0;

	s.SRB_Flags      = SRB_DIR_IN | SRB_EVENT_NOTIFY;

	s.SRB_BufLen     = 100;

	s.SRB_BufPointer = buf;

	s.SRB_SenseLen   = SENSE_LEN;

	s.SRB_CDBLen     = 6;



	s.CDBByte[0]     = SCSI_INQUIRY;

	s.CDBByte[1]     = 0;

	s.CDBByte[2]     = 0;

	s.CDBByte[3]     = 0;

	s.CDBByte[4]     = 100;

	s.CDBByte[5]     = 0;

	BYTE byStatus = ExecSCSICommand(&s);   //ExecSCSICommand封装SendASPI32Command即为发送方法





	if( byStatus != SS_COMP )

	{

		//cout << "getDriveName returned status:" << LookupASPIStatus(byStatus).c_str()  << endl;

	}





	if( byStatus == SS_ERR && s.SRB_TargStat == STATUS_CHKCOND )

	{

		BYTE SenseKey = s.SenseArea[2] & (BYTE)15;

		BYTE ASC = s.SenseArea[12];

		BYTE ASCQ = s.SenseArea[13];

	}



	//if the command was successful

	if( byStatus == SS_COMP )

	{

		//extract the whole string identifying the drive

		for( int i = 8; i < 36; i++ )

		{

			stringbuffer[i-8] = buf[i];

		}

		//the part I wish to extract is 28 characters long

		stringbuffer[28] = NULL;

	}



	return byStatus;

}

再看下面的代码，这段代码是获取类型为CDROM硬件的转速

int __fastcall getCDSpeed(BYTE hostadapter, BYTE target)

{

	SRB_ExecSCSICmd s;

	unsigned char b[256];



	memset( &s, 0, sizeof( s ) );

	memset( b, 0xFF, 256 );



	s.SRB_Cmd      = SC_EXEC_SCSI_CMD;

	s.SRB_HaId     = hostadapter;

	s.SRB_Target   = target;

	s.SRB_Lun      = 0;

	s.SRB_Flags    = SRB_DIR_IN | SRB_EVENT_NOTIFY;

	s.SRB_BufLen   = 256;

	s.SRB_BufPointer = b;

	s.SRB_CDBLen   = 12;

	s.CDBByte[0]   = SCSI_MODESENSE;

	s.CDBByte[2]   = 0x2A;    //mode page 0x2A contains the speed

	s.CDBByte[7]   = 0x01;

	s.CDBByte[8]   = 0x00;



	BYTE byStatus = ExecSCSICommand(&s);



	if( byStatus == SS_COMP )

	{



	}



	if( byStatus == SS_ERR && s.SRB_TargStat == STATUS_CHKCOND )

	{

		BYTE SenseKey = s.SenseArea[2] & (BYTE)15;

		BYTE ASC = s.SenseArea[12];

		BYTE ASCQ = s.SenseArea[13];

	}

	//speed is stored in bytes 22 & 23 of mode page 0x2A

	return (int)((b[22] << 8) + b[23]);

}

问题请教：
1.向硬件发送的SRB_ExecSCSICmd这个结构体里的CDBByte Byte数组到底是怎样设置的，通过上面两段代码可以看到，获取硬件不同属性就是通过设置这个数组来获取的，
获取硬件名称这样设置的，



        s.CDBByte[0]     = SCSI_INQUIRY;

	s.CDBByte[1]     = 0;

	s.CDBByte[2]     = 0;

	s.CDBByte[3]     = 0;

	s.CDBByte[4]     = 100;

获取硬件转速，这样设置的



        s.CDBByte[0]   = SCSI_MODESENSE;

	s.CDBByte[2]   = 0x2A;    //mode page 0x2A contains the speed

	s.CDBByte[7]   = 0x01;

	s.CDBByte[8]   = 0x00;

我现在就是不明白这些参数为什么要这样设置，有什么标准文档吗，赐教。

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