说明：  代码中都你如何在一张相片中加入Exif信息.Exif信息中包含了诸如曝光、ISO、GPS坐标等许多有用的信息.如果您的拍照软件拍完照片.并想在照片中加入自定信息时.请看源码!
(The code is how you add a photo Exif information. Exif information includes information such as exposure, ISO, GPS coordinates, and many other useful information. If your photo software photo shoot. And would like to add custom information photo time. Look at source!)