What is the type of/how do I initialize 'currentDevice' in this code?

Question

I'm trying to tell the camera in my app (which is build around OpenFrameworks) to auto focus. After reading this SO post I read through the AV Foundation Programming Guide on how to set the focus mode. The code they give as an example is:

if ([currentDevice isExposureModeSupported:AVCaptureExposureModeContinuousAutoExposure]) {
    CGPoint exposurePoint = CGPointMake(0.5f, 0.5f);
    [currentDevice setExposurePointOfInterest:exposurePoint];
    [currentDevice setExposureMode:AVCaptureExposureModeContinuousAutoExposure];
}

I haven't been able to figure out how to initialize currentDevice outside the if statement, and it's not in the documentation. How should it be initialized/what type is it? Thanks.

@Desdenova I don't know what currentDevice is. To use it I of course need to initialize it outside the if statement. I don't now how to make that initialization. — Matthew Herbst, Apr 29 '14 at 06:34
I guess reading this would be sufficient. http://www.musicalgeometry.com/?p=1554 — Desdenova, Apr 29 '14 at 06:37
@Desdenova Xcode isn't recognizing AVCaptureDevice as a type in my code for some reason — Matthew Herbst, Apr 29 '14 at 06:41
You need to link your binary with `AVFoundation.framework` and import it on your header file. — Desdenova, Apr 29 '14 at 06:46
Try using [UIDevice currentDevice] instead of just currentDevice — ZeMoon, Apr 29 '14 at 06:47
@Desdenova works perfectly. Write an answer so I can give you credit - appreciate the help! — Matthew Herbst, Apr 29 '14 at 06:54
@akashg That seems to work in terms of not throwing an error but the compiler did put out a warning saying: "'UIDevice' may not respond to 'isInFocusModeSupported:' I appreciate the help though, thanks! — Matthew Herbst, Apr 29 '14 at 06:56

score 1 · Accepted Answer · answered Apr 29 '14 at 07:00

1

You can read more about the AVCaptureDevice Class Reference

It refers to front or the back side camera. And don't forget to import the AVFoundation.framework

answered Apr 29 '14 at 07:00

Desdenova

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#import – Matthew Herbst Apr 29 '14 at 07:02

What is the type of/how do I initialize 'currentDevice' in this code?

1 Answers1