读取照片的Exif信息，这篇文章则是使用了ImageIO类来获取照片的信息

前段时间写了一篇文章：读取照片的Exif信息，这篇文章则是使用了ImageIO类来获取照片的信息。

 

首先将ImageIO.framework导入项目中，然后导入头文件：

 

 #import <ImageIO/ImageIO.h>

 

示例：

 

 NSURL *modelURL = [[NSBundle mainBundle] URLForResource:@"rails.png" withExtension:nil];
 CGImageSourceRef myImageSource = CGImageSourceCreateWithURL((CFURLRef)modelURL, NULL);
 CFDictionaryRef imagePropertiesDictionary = CGImageSourceCopyPropertiesAtIndex(myImageSource,0, NULL);
 CFNumberRef imageWidth = (CFNumberRef)CFDictionaryGetValue(imagePropertiesDictionary, kCGImagePropertyPixelWidth);
 CFNumberRef imageHeight = (CFNumberRef)CFDictionaryGetValue(imagePropertiesDictionary, kCGImagePropertyPixelHeight);

 NSLog(@"%@", imagePropertiesDictionary);

 int w = 0;
 int h = 0;

 CFNumberGetValue(imageWidth, kCFNumberIntType, &w);
 CFNumberGetValue(imageHeight, kCFNumberIntType, &h);

 CFRelease(imagePropertiesDictionary);
 CFRelease(myImageSource);

 printf("Image Width: %d\n", w);
 printf("Image Height: %d", h);

 

示例输出：

 

 {
     ColorModel = RGB;
     Depth = 8;
     HasAlpha = 1;
     PixelHeight = 64;
     PixelWidth = 50;
     "{PNG}" =     {
         InterlaceType = 0;
         Software = "Adobe ImageReady";
     };
 }
 Image Width: 50
 Image Height: 64