How to capture image in ARKit and send Binary data?

问题

I want to make a capture image in ARKit and send byte array to TCP server.

Well This is my code.

    @IBOutlet weak var sceneView: ARSCNView!
    @IBAction func sendButtonAction(_ sender: Any) {

    let captureImage:UIImage = self.sceneView.snapshot()
    }

I can get image by snapshot but i don't know how convert it to Byte Array (include pixel R,G,B Data.)

I tried to change UIImage to binary data like this.

    let imageData: NSData = UIImagePNGRepresentation(captureImage)! as NSData

but this is not correct because imageData's size is mutable whenever i snapshot :(

My purpose is to make a captureImage's Byte(UInt8) array which size is Width*Height*3(R,G,B) Bytes

If you have any ideas to solve this problem, please help me.

回答1:

I'm a little confused about what exactly isn't working for you by using UIImagePNGRepresentation, sorry if I'm missing something or maybe you could clarify.

But for one, PNG would be expecting RGBA, so you might want to try UIImageJPEGRepresentation, since it doesn't support an alpha channel.

And if you're trying to get an actual NSMutableArray, see if this old answer helps: https://stackoverflow.com/a/29734175/8895191

来源：https://stackoverflow.com/questions/48364722/how-to-capture-image-in-arkit-and-send-binary-data