Several properties of Avcapturedevice

AVCaptureDevice.h, mainly used to get the iphone some properties about camera devices.

AVCaptureDevice.h, the Avfoundation.framework package must be introduced.

1. Front-and rear-facing cameras

enum {    1,    2};typedef nsinteger avcapturedeviceposition;

2. Flash switch

enum {    0,    1,    2};typedef Nsinteger Avcaptureflashmode;

3. Flashlight Switch

enum {    0,    1,    2};typedef Nsinteger Avcapturetorchmode;

4. Focal length adjustment

enum {    0,    1,    2};typedef Nsinteger Avcapturefocusmode;

5. Adjustment of exposure volume

enum {    0,    1,    2};typedef Nsinteger Avcaptureexposuremode;

6. White balance

enum {    0,    1,    2

Turn on the Flash

avcapturedevice* d = nil;//Find a device by position
nsarray* alldevices = [Avcapturedevice devices];
For (avcapturedevice* Currentdevice in alldevices)
{
if (currentdevice.position = = Avcapturedevicepositionback)
{
D = currentdevice;
}
}

//at this point, D may still is nil, assuming we found something we like ....
nserror* err = nil;
BOOL lockacquired = [D lockforconfiguration:&err];
if (!lockacquired) {
       //log err and handle ...
} else {
      //Flip on the flash mode
if ([D hasflash] && [D Isflashmodesupported:avcaptureflashmodeon])
{
[D Setflashmode:avcaptureflashmodeon];
}

[D unlockforconfiguration];
}

Several properties of Avcapturedevice