Thank you , it works, it suits my situation, actually I have try this "withUnsafeBytes" method before, just close to the answer, but didn't use buffer like that way .
And yes , the camera vendor provided the SDK
HayesLiang
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not json，just binary data，the data came from 360 camera with bluetooth or wifi link ,it will call this function when data is prepared ,and I wanna use this gyro info in my Swift program