iOS - 上传完整的 EXIF 图像

Question

我在我的应用程序文档目录中保存了带有 EXIF 数据的 .jpg 格式的图像。我的问题是，每当我尝试将 .jpg 文件转换为 NSData 以使用 HTTP POST 上传时，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 Documents 目录上传我的 .jpg 文件且其 EXIF 完好无损？

Answer 1

保存 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>];
    });
}

希望对您有所帮助。