How to activate the LED for a flashlight iphone4 app?

Question

Hi

I'm currently taking a summer class in iphone development this summer and our assignment this summer to make a flashlight app for our iphones. I have a iphone 4 and would like to utilize the LED on my iphone for my project, can anyone help me how to get started with that?

it would be very helpful if someone could point me in the right direction.

Thank you. David H.

Answer 1

Use the following:

AVCaptureSession * session = [[AVCaptureSession alloc] init];

[session beginConfiguration];

AVCaptureDevice * device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

if ([device hasTorch] && [device hasFlash]){
[device lockForConfiguration:nil];
[device setTorchMode:AVCaptureTorchModeOn];
[device setFlashMode:AVCaptureFlashModeOn]; 
[device unlockForConfiguration];

AVCaptureDeviceInput * flashInput = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];
if (flashInput){
    [session addInput:flashInput];
}
    AVCaptureVideoDataOutput * output = [[AVCaptureVideoDataOutput alloc] init];
    [session addOutput:output];
        [output release];
    [session commitConfiguration];  
    [session startRunning];
}
[self setTorchSession:session];
[session release];

(From a discussion on iPhoneDevSDK)