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

问题描述

如何访问使用新的 4.0/4.1 API 拍摄的相机照片中的 EXIF 信息?

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

我使用 _captureStillImageAsynchronouslyFromConnection_ 拍照并:

[AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer];

要获取 jpg 数据，但如何提取 EXIF?

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

doco 引用了包含 EXIF 的 imageDataSampleBuffer(如果我在控制台中检查变量，我可以在其中看到它):

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

"缓冲区附件可能包含适合图像数据格式的元数据.例如，包含 JPEG 数据的缓冲区可能携带 kCGImagePropertyExifDictionary 作为附件"

"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"

但我不知道如何操作 CMSampleBufferRef 来访问它.

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

谢谢.

推荐答案

iOS4引入的Image I/O Framework允许根据文档从图片中读取EXIF属性.

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

链接:CGImageSource 参考 - 查看 CGImageSourceCopyPropertiesAtIndex 函数.

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

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