AudioFileID Read＆amp;写

Question

我想从AudioFileID读取，然后使用此方法写入结尾（使其循环）：

        UInt64 outDataSize = 0;
        UInt32 thePropSize = sizeof(UInt64);
        OSStatus result = AudioFileGetProperty(mBackupRecordFile, kAudioFilePropertyAudioDataByteCount, &thePropSize, &outDataSize);

        UInt32 readPoint  = outDataSize;
        void* theData = malloc(outDataSize);

        OSStatus result2 = AudioFileReadBytes(mBackupRecordFile, FALSE, 0, &readPoint, theData);

        UInt32 writeBytes = readPoint;

        OSStatus result3 = AudioFileWriteBytes(mBackupRecordFile, FALSE, readPoint, &writeBytes, theData);

问题是在result3中我得到一个大数而不是0，文件不会增加。 result3的值是1869627199 = kAudioFileOperationNotSupportedError