AFNetworking: Can't get the response string from AFHTTPRequestOperation

Question

Anyone?): I'm having a problem that has made me scratch my head for the last 2 hours, and it most likely a very simple stupid thing I'm missing. I Keep getting a building error when I Call the response string from the operation @ AFNetworking... Like there is NO SUCH PROPERTY....

Please Take a look at my code and Explain me what did I Mess up This time :p.. THanks :)

---

NSDictionary* paramDict = [NSDictionary dictionaryWithObjectsAndKeys:WebServicemd5Value, WebSermd5Variable, nil]
;
AFHTTPClient *httpClient = [[AFHTTPClient alloc] initWithBaseURL:[NSURL URLWithString:webServiceURL]];

[httpClient defaultValueForHeader:@"Accept"];

[httpClient postPath:@"method" parameters:paramDict success:^(AFHTTPRequestOperation *operation, id responseObject) {
    NSLog(@"Response data: %@", responseObject);
    NSLog(@"Reponse String: %@", operation);

// Printing operation will show me the operation Dictionary, including the reponse field, // but when I Directly call operation.response, the Compiler won't Build, stating that // "Property not found for AFHTTPRequestOperation".... WEIRDEST THING EVER, right?

    NSString* responseString = [NSString stringWithUTF8String:[responseObject bytes]];
    //.. Rest o f my Code....

}failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    NSLog(@"Error retrieving data: %@", error);
}];

Largo

I'd Like to Simply print the operation.response in the NSLOG instead of the operation itself... – Largo

Are you saying, that when you do NSLog(@"Response object %@",operation.response); - the compiler complains, but when you do NSLog(@"Operation object %@",operation); it prints and it has response as one of its elements. What is your console output. – Shull

Have you tried printing out individual pieces of the operation response? For instance printing out the status code NSLog(@"Operation response status = %@", [NSHTTPURLResponse localizedStringForStatusCode:operation.response.statusCode]); – Serow

@Srinkanth - The Console output is lke a Series of Hexadecimal Numbers.. not Really a Dictionary as I Expected... Thanks – Largo

@Adam Johnson: That's the Thing... I Can't Access operation.response, nor operation.response.statusCode... Weird right? Thanks for the Reply :-) – Largo

Answer 1

Hernan, if you expect an NSDictionary from a JSON response you should consider using AFJSONRequestOperation, because you get a JSON dictionary in your success callback. Anyway, if you want to get a dictionary from your responseObject, try to use the following code:

NSError *error = nil;
NSDictionary *JSON = [NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingAllowFragments error:&error];
if (error) {
    NSLog(@"Error serializing %@", error);
}
NSLog(@"Dictionary %@", JSON);

Cornea

hi Amb: Thanks for responding Mate... I'll surely be trying the NSJSONSerialization for the Response Object, do I Place it as Is? Or Should I Convert it to UTF8 String? [NSString stringWithUTF8String:[responseObject bytes]].... – Largo

Well, I Tried it, but the Server is Returning me a Response that Does Not Get Parsed OK by the JSON Parser.. I Get: 2012-12-16 19:17:14.536 Vidac[3561:19d03] Error serializing Error Domain=NSCocoaErrorDomain Code=3840 "The operation couldn’t be completed. (Cocoa error 3840.)" (Invalid value around character 0.) UserInfo=0x94917d0 {NSDebugDescription=Invalid value around character 0.} Printing description of responseObject: <59397142 7871677a ...... > 2012-12-16 19:17:42.592 Vidac[3561:19d03] Dictionary (null) – Largo

It seems that your server side is not returning a valid JSON object propertly, or that you have some problems with encoding. Try to copy and paste your JSON string response and check with a validator if everything is OK. Also, check NSJSONSerialization options. – Cornea

Answer 2

I believe the response string is inside the "operation" object, so something like:

...
}failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    NSLog(@"Error retrieving data: %@", operation.responseString);
}];

Exequatur

Answer 3

While attempting to retrieve content from meetup.com api using AFNetworking (kudos to Mattt T. for a great framework, btw), ran into the same error - "The operation couldn't be completed. (Cocoa error 3840)". Realized that the issue I was having was with the response data containing a Swedish character 'Ø', resulting in the parsing error. The solution was to include the header 'Accept-Charset: utf-8' in the initialization of the AFNetworking client. Fixed!

- (id)initWithBaseURL:(NSURL *)url {
    self = [super initWithBaseURL:url];
    if (!self) {
        return nil;
    }

    [self registerHTTPOperationClass:[AFJSONRequestOperation class]];

    // Accept HTTP Header; see http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.1
    [self setDefaultHeader:@"Accept" value:@"application/json"];
    [self setDefaultHeader:@"Accept-Charset" value:@"utf-8"];

    return self;
}

Burnout

"Ø" is danish. The Swedish version would be "Ö". :) – Bruell