Question

我正在尝试将DeviceIoControl（）与SCSI_PASS_THROUGH_DIRECT一起使用，以便获取TRACK_INFO。

此代码“有效”但通过将ScsiStatus设置为2来返回关于“跟踪”数据字段的大小似乎存在冲突的文档。 mmc doc说这是1位长，然而，在网上我发现它是2位长的参考。

然而，不管怎样，它都失败了。

我整天都在绞尽脑汁，我没有。有谁理解这个？

#define kSCSICmd_READ_TRACK_INFORMATION 0x52

// Read Track Information Format
struct CDTrackInfo
{
    UInt16 dataLength;
    UInt8  trackNumberLSB;
    UInt8  sessionNumberLSB;
    UInt8  reserved;
#ifdef __LITTLE_ENDIAN__
    UInt8  trackMode:4;
    UInt8  copy:1;
    UInt8  damage:1;
    UInt8  reserved3:2;

    UInt8  dataMode:4;
    UInt8  fixedPacket:1;
    UInt8  packet:1;
    UInt8  blank:1;
    UInt8  reservedTrack:1;

    UInt8  nextWritableAddressValid:1;
    UInt8  lastRecordedAddressValid:1;
    UInt8  reserved5:6;
#else /* !__LITTLE_ENDIAN__ */
    UInt8  reserved3:2;
    UInt8  damage:1;
    UInt8  copy:1;
    UInt8  trackMode:4;

    UInt8  reservedTrack:1;
    UInt8  blank:1;
    UInt8  packet:1;
    UInt8  fixedPacket:1;
    UInt8  dataMode:4;

    UInt8  reserved5:6;
    UInt8  lastRecordedAddressValid:1;
    UInt8  nextWritableAddressValid:1;
#endif /* !__LITTLE_ENDIAN__ */
    UInt32 trackStartAddress;
    UInt32 nextWritableAddress;
    UInt32 freeBlocks;
    UInt32 fixedPacketSize;
    UInt32 trackSize;
    UInt32 lastRecordedAddress;
    UInt8  trackNumberMSB;
    UInt8  sessionNumberMSB;
    UInt8  reserved6;
    UInt8  reserved7;
};
typedef struct CDTrackInfo CDTrackInfo;

/*
 from mmc r10a
 6.2.8 Read CD 
 table 140
 page 110
 */
typedef struct {
    UInt8       op_code;

    #if TARGET_RT_BIG_ENDIAN
        UInt8       reserved0       : 7;    //  <-- possibly 6?
        UInt8       track           : 1;    //  <-- possibly 2?
    #else
        UInt8       track           : 1;
        UInt8       reserved0       : 7;
    #endif

    UInt32      lba_or_track_number;
    UInt8       reserved1;
    UInt16      alloc_len;
    UInt8       control;
} SCSICommandDescriptorBlock_ReadTrackInfo;

OSStatus    CRawDiscReader::GetTrackInfo(int trackI, CDTrackInfo *trackInfoP)
{   
    OSStatus            err = noErr;

    if (i_deviceH == NULL) {
        ERR(Open());
    }

    if (!err) {
        SCSI_PASS_THROUGH_DIRECT        pass_thru = { 0 };
        SCSICommandDescriptorBlock_ReadTrackInfo&       cdb(*(SCSICommandDescriptorBlock_ReadTrackInfo *)&pass_thru.Cdb[0]);

        CF_ASSERT(sizeof(cdb) == kSCSICDBSize_10Byte);
        structclr(*trackInfoP);

        cdb.op_code                 = kSCSICmd_READ_TRACK_INFORMATION;
        cdb.track                   = true;
        cdb.lba_or_track_number     = trackI;
        cdb.alloc_len               = sizeof(CDTrackInfo);

        DWORD           numRead = 0;

        pass_thru.Length                    = sizeof(pass_thru);
        pass_thru.CdbLength                 = sizeof(cdb);
        pass_thru.DataIn                    = SCSI_IOCTL_DATA_IN;
        pass_thru.TimeOutValue              = kTimeOutSeconds;
        pass_thru.DataBuffer                = (PVOID)trackInfoP;
        pass_thru.DataTransferLength        = cdb.alloc_len;

        if (!DeviceIoControl(
            i_deviceH, 
            IOCTL_SCSI_PASS_THROUGH_DIRECT,
            (PVOID)&pass_thru,
            (DWORD)sizeof(pass_thru),
            (PVOID)&pass_thru,
            (DWORD)sizeof(pass_thru),
            &numRead, NULL)
        ) {
            err = GetLastError();
            LogErr("reading CD:", err);

        } else if (numRead != pass_thru.Length) {
            err = GetLastError();
            LogErr("reading CD:", err);
            err = noErr;
        }
    }

    if (err && err != ERR_Already_Reported) {
        #if OPT_WINOS
            if (err == ERROR_INVALID_PARAMETER) {
                err = paramErr;
            } else 
        #endif
        {
            err = EIO;
        }
    }

    return err;
}

Answer 1

答案似乎是“不要使用IOCTL_SCSI_PASS_THROUGH_DIRECT”。

OSStatus    CRawDiscReader::GetTrackInfo(IDiscRecorder2Ex *discP, int trackI, CDTrackInfo *trackInfoP)
{
    OSStatus                            err = noErr;
    HRESULT                             resultL = 0;
    BYTE                                *dataP = NULL;
    ULONG_IMAPI2_TRACK_INFORMATION      outSize = 0;

    structclr(*trackInfoP);

    resultL = discP->GetTrackInformation(
        trackI, 
        IMAPI_READ_TRACK_ADDRESS_TYPE_TRACK, 
        &dataP, &outSize);

    XTE(TrapError("GetTrackInformation", resultL));

    if (!err) {
        CDTrackInfo     *returnInfoP = (CDTrackInfo *)dataP;

        *trackInfoP = *returnInfoP;
        CoTaskMemFree(dataP);
        dataP = NULL;

        SwapTrackInfo(trackInfoP);
    }

    return err;
}

如何使用DeviceIOControl（）从CD中获取“Track Information”？

1 个答案: