带有对象参数的 POST - iOS答案

【问题标题】：POST with Object parameters - iOS带有对象参数的 POST - iOS
【发布时间】：2014-05-30 09:24:20
【问题描述】：

我有一个 iOS 应用程序，它向包括 Facebook 在内的在线服务发出经过身份验证的 POST 请求。我的问题是我知道如何发布文本，但我不能发布图片。这是我的代码：

 NSData *imageData = UIImagePNGRepresentation(image_selected);
    NSString *postLength = [NSString stringWithFormat:@"%d", [imageData length]];

    // Init the URLRequest
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    [request setHTTPMethod:@"POST"];

    NSString *facebook_picture_url = [NSString stringWithFormat:@"https://graph.facebook.com/ID/photos?message=%@&access_token=%@", inputted_text, token_facebook];
                    [request setURL:[NSURL URLWithString:facebook_picture_url]];
                    [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
                    [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
                    [request setHTTPBody:imageData];
                    request.HTTPBody = imageData;
                    request.HTTPMethod = @"POST";


                    NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
                    NSHTTPURLResponse *response = nil;
                    NSError *error = nil;
                    NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
                    NSLog(@"The responce:\n\n%@", response);

                    if (connection) {
                        // response data of the request
                    }

如您所见，我可以将“imageData”添加到 HTTPBody，但问题是某些服务需要它作为某种参数。例如：Facebook 希望它是：

source="图像数据...."

此外，如果您查看 URL，您会看到有一个 'message=' 参数。这一切都有效，但我肯定可以将它添加到 HTTPBody 中吗？？

我需要使用类似 NSDictionary 的东西吗？

感谢您的宝贵时间，丹尼尔

【问题讨论】：

标签： ios image cocoa-touch post nsdata

【解决方案1】：

感谢开发者社区的帮助，哈哈……无论如何，如果有人正在阅读本文并有兴趣了解如何将图像发布到 Facebook 等服务，我就是这样做的：

NSData *imageData = UIImagePNGRepresentation(image_selected);

NSString *facebook_picture_url = [NSString stringWithFormat:@"https://graph.facebook.com/USER_ID/photos?message=%@&access_token=%@", inputted_text, token_facebook];

NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
[request setURL:[NSURL URLWithString:facebook_picture_url]];
[request setHTTPMethod:@"POST"];

NSString *boundary = @"---------------------------14737809831466499882746641449";
NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary];
[request addValue:contentType forHTTPHeaderField:@"Content-Type"];

NSMutableData *body = [NSMutableData data];
[body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[@"Content-Disposition: form-data; name=\"userfile\"; filename=\".JPG\"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[@"Content-Type: application/octet-stream\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[NSData dataWithData:imageData]];
[body appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[request setHTTPBody:body];

NSHTTPURLResponse *response = nil;
NSError *error = nil;
NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
NSLog(@"The responce:\n\n%@", responseData);

if (error == nil && response.statusCode == 200) {
    NSLog(@"%li", (long)response.statusCode);
}

else {
  //Error handling
  NSLog(@"%@", response);
}

【讨论】：