你好，请问可以参考一下iOS应用使用 ImageCaptureCore 框架与相机进行 PTP 通信的代码吗，我现在可以获取设备的基本信息，但是使用PTP接口与相机通信出现IO错误，测试了其他应用没有问题。 感谢。

struct { uint32_t length; uint16_t type; uint16_t code; uint32_t transactionId; uint32_t Param1; } __attribute__((packed)) ptpCommand; ptpCommand.length = 16; ptpCommand.type = 2; ptpCommand.code = 0x9205; ptpCommand.transactionId = 3; ptpCommand.Param1 = 0xD25A; NSData sendCommand = [NSData dataWithBytes:&ptpCommand length:16]; unsigned char specialData = 1; NSData sendData = [NSData dataWithBytes:&specialData length:1]; [cam requestSendPTPCommand:sendCommand outData:sendData completion:^(NSData* responseData, NSData* ptpResponseData, NSError* err){ }]; I don't know if specialData needs to be placed in sendData or sendCommand. I have tried various data structures, but none of them work

The camera is Sony A7M3 (ILCE-7M3), and the camera supports the command for this setting properties. The transmitted command and data are also correct, and the expected return is data with a length of 12 for ptpResponseData