Question

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];

如何从文档目录上传我的.jpg文件并保留其EXIF原样？

Answer 1

保留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。

iOS - 使用EXIF完整上传图像

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