Assertion failure appending to multipart form

Question

I'm migrating my app from ASIHTTPRequest to AFNetworking to talk to the backend API. Everything seems to work fine except by image uploading. I've used different examples over the internet, but running it on my app always causes a crash.

2013-02-22 17:02:28.680 MyApp[1477:907] *** Assertion failure in -[AFStreamingMultipartFormData appendPartWithHeaders:body:], AFNetworking/AFHTTPClient.m:885
2013-02-22 17:02:28.687 MyApp[1477:907] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid parameter not satisfying: body'

The problem seems to be here:

NSMutableURLRequest *request = [[MyServiceAPIClient sharedClient] multipartFormRequestWithMethod:@"POST" path:@"/api/method" parameters:nil constructingBodyWithBlock: ^(id <AFMultipartFormData>formData) {
    [formData appendPartWithFileData:imageData name:@"face" fileName:@"face.jpg" mimeType:@"image/jpeg"];
}];

MyServiceAPIClient is a singleton class with as given in the AFNetworking iOS example app.

If I comment the appendPartWithFileData part everything runs fine, obviously it won't send my picture.

If I replace the multipart form request with a ordinary post request, it works. The only problem is appending my NSData to the form.

Any observations? Thanks.

score 18 · Accepted Answer · answered Feb 22 '13 at 20:32

18

After looking into the AFNetworking/AFHTTPClient.m code, my guess is that your imageData is nil.

answered Feb 22 '13 at 20:32

Sulthan

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You're right! I didn't notice something as trivial as that were failing. Thank you for your help. – Marco Torres Morgado Feb 22 '13 at 21:30
So what is exactly the fix of this bug? – Balz Dec 15 '13 at 16:34
3

@Balz Not sending `nil` data. – Sulthan Dec 15 '13 at 16:41
@balz how did you solve this issue I have similar question here: http://stackoverflow.com/questions/22180367/afnetworking-2-2-0-upload-image-on-server-issues – Matrosov Oleksandr Mar 04 '14 at 18:56

score 2 · Answer 2 · answered Sep 05 '13 at 07:38

2

Just to add, while Sulthan's answer is correct, you can generally get this error message by inserting any parameter with a nil value into formData.

answered Sep 05 '13 at 07:38

Matthew Quiros

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how can I solve this issue, please can you check my question as well http://stackoverflow.com/questions/22180367/afnetworking-2-2-0-upload-image-on-server-issues – Matrosov Oleksandr Mar 04 '14 at 18:57

Assertion failure appending to multipart form

2 Answers2