//枚舉定義圖片類型

{NSPUIImageType_JPEG,NSPUIImageType_PNG,NSPUIImageType_GIF,NSPUIImageType_Unknown };

//定義方法

static inline NSPUIImageType NSPUIImageTypeFromData(NSData *imageData) {if (imageData.length > 4) {const unsigned char * bytes = [imageData bytes];if (bytes[0] == 0xff &&bytes[1] == 0xd8 &&bytes[2] == 0xff){return NSPUIImageType_JPEG;}if (bytes[0] == 0x89 &&bytes[1] == 0x50 &&bytes[2] == 0x4e &&bytes[3] == 0x47){return NSPUIImageType_PNG;}if (bytes[0] == 0x47){return NSPUIImageType_GIF;}}return NSPUIImageType_Unknown;}

//調用

NSURL *url = [NSURL URLWithString:@"http://g.hiphotos.baidu.com/image/pic/item/c2cec3fdfc03924578c6cfe18394a4c27c1e25e8.jpg"];NSData *data = [NSData dataWithContentsOfURL:url];//NSData *data = [NSData dataWithContentsOfFile:@"/Users/apple/Desktop/book_cover.png"]; NSPUIImageType type = NSPUIImageTypeFromData(data);if (type == NSPUIImageType_JPEG) {NSLog(@"JPEG");}else if (type == NSPUIImageType_PNG) {NSLog(@"PNG");}else if (type == NSPUIImageType_PNG) {NSLog(@"GIF");}else {NSLog(@"Unknown");}

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轉載于:https://www.cnblogs.com/pengyunjing/p/5993751.html

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