CMIO Camera Extension and debug log

Question

Created Nov ’23

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I made s target of "Camera Extension" on Xcode macOS Swift app. I got Swift code with CMIOExtensionDeviceSource. I add NSLog() and String.write() to file under FileManager.default.temporaryDirectory.

My camera extension installaion was success and running with FaceTime.

But I cannot see NSLog output or debug output temp file on Xcode or Console. How can I see debug output from my Camera Extension?

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Answer 1

Himadeus OP

Nov ’23

I found a way.

Install Camera Extension by OSSystemExtensionManager.shared.submitRequest and OSSystemExtensionRequest.activationRequest
Start FaceTime or Quick Camera app, select your camera extension as video source.
Check PID of your Camera extension by ps -ae | grep com.example.YourCameraExtension
Run command log show --predicate 'processID == [PID]' --info
You can see NSLog output from your Camera Extension

If someone has easier way, please let me know.

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Answer 2

DTS Engineer OP

Apple

Nov ’23

Hello,

I recommend using a Logger, take a look at this WWDC video for more info (the link is timestamped to the relevant section): https://developer.apple.com/videos/play/wwdc2020/10168/?time=369

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