Databases
StackOverflow2013
Postsdbo
POSending more than one image with AFNetworking
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POSending more than one image with AFNetworking
    primarykey
    data
    text
    <p>I'm developing a messaging app, and users can also send pictures to one another.<br> When a user sends more than one picture I send them in parallel (I don't wait for the first one to finish upload before I send the second one) </p> <p>Before moving to <code>AFNetworking</code> I succeeded in doing this with <code>ASIFormDataRequest</code>, and indeed if I sent 2 images, both of them were transmitted in parallel and successfully delivered to the other user. </p> <p>When I try doing this with AFNetworking, I get some strange behavior.<br> I'll try to describe the case were user1 send two images too user2: </p> <ol> <li>User1 send image1 -> everything looks ok, I can see the upload progress. </li> <li>User1 then send image2 -> still looks ok, I can see the upload progress of both images </li> <li>image1 upload is finished -> user2 gets a corrupted image that looks like a combination of image1 and image2 together! </li> <li>image2 upload is finished -> user2 gets image2 successfully </li> </ol> <p>This is how I send an image </p> <pre><code>- (void)sendImageMsgWithPath:(NSString *)path image:(UIImage *)image success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure progress:(void (^)(NSInteger bytesWritten, long long totalBytesWritten, long long totalBytesExpectedToWrite))progress { NSData *imageData = UIImageJPEGRepresentation(image, 0.5); // create the request NSURLRequest *request = [[AppClient sharedClient] multipartFormRequestWithMethod:@"POST" path:path parameters:nil constructingBodyWithBlock:^(id&lt;AFMultipartFormData&gt; formData) { [formData appendPartWithFileData:imageData name:@"image_name" fileName:@"image_name.jpg" mimeType:@"image/jpeg"]; }]; // create the operation AFHTTPRequestOperation *operation = [[[AFHTTPRequestOperation alloc] initWithRequest:request] autorelease]; // set progress block [operation setUploadProgressBlock:progress]; //set completion blocks [operation setCompletionBlockWithSuccess:success failure:failure]; // set it to work in background [operation setShouldExecuteAsBackgroundTaskWithExpirationHandler:nil]; // add it to the operations queue [[AppClient sharedClient] enqueueHTTPRequestOperation:operation]; } </code></pre> <p>*** the path for both image uploads is the same: </p> <blockquote> <p>path = @"FrontEnd?cmd=sendimage&amp;fromuserid=3&amp;touserid=1&amp;" </p> </blockquote> <p>it will be added to the baseURL to create the coplete URL: </p> <blockquote> <p>@"<a href="http://somename.myftp.org:8080/web_proj/FrontEnd?cmd=sendimage&amp;fromuserid=3&amp;touserid=1" rel="nofollow noreferrer">http://somename.myftp.org:8080/web_proj/FrontEnd?cmd=sendimage&amp;fromuserid=3&amp;touserid=1</a>"</p> </blockquote> <p>This are the images I sent:<br> image1<br> <img src="https://i.stack.imgur.com/C56S5.png" alt="enter image description here"> </p> <p>image2<br> <img src="https://i.stack.imgur.com/Nzd8H.png" alt="enter image description here"> </p> <p>corrupted image<br> <img src="https://i.stack.imgur.com/FvSnw.png" alt="enter image description here"></p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USMarcos Gonzalez
    1. USEyal
    plurals
    1. This table or related slice is empty.
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POSending more than one image with AFNetworking
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POSending more than one image with AFNetworking
      1. USEyal
      1. VTBountyStart
    3. VO
      singulars
      1. POSending more than one image with AFNetworking
      1. This table or related slice is empty.
      1. VTUpMod
    1. COmake sure you are using separate buffers for each image you send. Also make sure your receiver is using separate buffers for each received image. Sounds like they are being combined somewhere. Finally, if you are sending/receiving over 3G/4G, you may not get much throughput improvement by sending all images in parallel. You will have to experiment to see how many streams are optimal.
      singulars
      1. POSending more than one image with AFNetworking
      1. USnielsbot
    2. COI succeed doing this with ASIHTTPRequest library so it's probably not a server issue. About the buffers in client side, well I don't really handle this, I'm just using the AFNetworking API, not sure if the library manage that or if I need to do it...
      singulars
      1. POSending more than one image with AFNetworking
      1. USEyal
    3. COHow are you handling this in the server side? Maybe you are writing the received images into the same file: the first one starts getting overwritten by the second one, the second one is sent ok, because it has overwritten the first one completely.
      singulars
      1. POSending more than one image with AFNetworking
      1. USyonosoytu
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload