如何在iOS 4.0+中从相机拍摄的照片中访问照片EXIF？ [英] How to access photo EXIF in pictures taken from camera in iOS 4.0+?

问题描述

如何使用新的4.0 / 4.1 API访问来自相机的图片中的EXIF信息？

我使用 _captureStillImageAsynchronouslyFromConnection_ 拍摄照片和：

  [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation：imageDataSampleBuffer]; 
  

获取jpg数据，但如何提取EXIF？

doco引用包含EXIF的 imageDataSampleBuffer （如果我在控制台中检查变量，我可以看到它）：

缓冲区附件可以包含适合于图像数据格式的元数据，例如，包含JPEG数据的缓冲区可以携带 kCGImagePropertyExifDictionary 作为附件

但我无法弄清楚如何操作CMSampleBufferRef来获取它。

感谢。

解决方案

iOS4中引入的Image I / O框架允许读取EXIF属性从

链接：CGImageSource参考 - 请查看 CGImageSourceCopyPropertiesAtIndex 函数。 / p>

How do I access the EXIF info in a picture from the camera taken using the new 4.0/4.1 APIs?

I use _captureStillImageAsynchronouslyFromConnection_ to take the picture and:

[AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer];

to get the jpg data but how do I extract the EXIF?

The doco makes references to imageDataSampleBuffer containing EXIF (I can see it in there if I examine the variable in the console):

"The buffer attachments may contain metadata appropriate to the image data format. For example, a buffer containing JPEG data may carry a kCGImagePropertyExifDictionary as an attachment"

But I can't figure out how to manipulate a CMSampleBufferRef to acces it.

Thanks.

解决方案

The Image I/O Framework which was introduced in iOS4 allows one to read EXIF properties from a picture according to the documentation.

Link: CGImageSource Reference - have a look at the CGImageSourceCopyPropertiesAtIndex function.

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