iOS – 使用EXIF完整上传图像

发布时间：2020-12-14 19:08:53 所属栏目：百科来源：网络整理

导读：我的图像以.jpg格式保存在我的应用程序文档目录中,带有EXIF数据.我的问题是,每当我尝试将.jpg文件转换为使用HTTP POST上传的NSData时,上传的图像都会丢失其所有EXIF数据. NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserD

我的图像以.jpg格式保存在我的应用程序文档目录中,带有EXIF数据.我的问题是,每当我尝试将.jpg文件转换为使用HTTP POST上传的NSData时,上传的图像都会丢失其所有EXIF数据.

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
NSString *documentsPath = [paths objectAtIndex:0];
NSString *imagePath = [documentsPath stringByAppendingPathComponent:[NSString stringWithFormat:@"%@",imageName]];
NSData *jpegImageData = [NSData dataWithContentsOfFile:imagePath];

如何从文档目录上传我的.jpg文件,其EXIF完好无损？

解决方法

保持jpg文件的EXIF元数据.我使用了解决方案：

- (void)uploadImage:(NSString *)imagePath {
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND,0),^{
        // Repair upload data
        UIImage *image = [UIImage imageNamed:imagePath];

        NSData *rawDataImage = UIImageJPEGRepresentation(image,1.0f);

        NSString *base64EncodedString = @"";
        if ([rawDataImage respondsToSelector:@selector(base64EncodedStringWithOptions:)])
        {
            base64EncodedString = [rawDataImage base64EncodedStringWithOptions:0];
        }
        else
        {
            base64EncodedString = [rawDataImage base64Encoding];
        }

        NSString *uploadBody = [NSString stringWithFormat:@"{"imageData": "%@"}",base64EncodedString];

        // Post uploadBody to server
        NSString *serverUrl = @"Your_server";

        NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:serverUrl]];

        [request addValue:@"application/json; charset=utf-8" forHTTPHeaderField:@"Content-Type"];

        NSString *msgLength = [NSString stringWithFormat:@"%lu",uploadBody.length];
        [request addValue:msgLength forHTTPHeaderField:@"Content-Length"];

        [request setHTTPMethod:@"POST"];
        [request setHTTPBody:[uploadBody dataUsingEncoding:NSUTF8StringEncoding]];

        [NSURLConnection connectionWithRequest:request delegate:<your_delegate OR nil>];
    });
}

希望这对你有所帮助.

（编辑：李大同）

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