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PONSMutableData setLength:NSUInteger crashing the app
 

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  1. PONSMutableData setLength:NSUInteger crashing the app
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    <p>Trying to create a connection of a request with an URL. An NSMutableData instance (responseData) also gets called with it. When the connection starts receiving response, the setLength:NSUInteger method gets called up on the NSMutableData Instance. </p> <pre><code>-(void)startDataDownloading { NSURLRequest *_request = [NSURLRequest requestWithURL:self.url]; if (_request) { if (!connecton) { connecton = [NSURLConnection connectionWithRequest:_request delegate:self]; if (connecton) { responseData = [NSMutableData data]; [connecton start]; } } } } - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { [responseData setLength:0]; } - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { [responseData appendData:data]; } </code></pre> <p>But somehow it causes a crash with a warning on the setLength call. The error states that </p> <p><b>" -[__NSCFDictionary setLength:]: unrecognized selector sent to instance 0x6a8cf70 2012-11-30 18:00:38.948 RSSReader[8997:f803] <em>*</em> Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFDictionary setLength:]: unrecognized selector sent to instance 0x6a8cf70' " </b></p> <p>Any hint about this would be appreciated.</p> <pre><code>#import &lt;Foundation/Foundation.h&gt; #import "DataParser.h" @protocol DataConnectionDelegate &lt;NSObject&gt; //protocol methods @end @interface UCDataConnection : NSObject &lt;ModelParser&gt; @property (nonatomic, strong) NSURL *url; @property (nonatomic, strong) NSURLConnection *connecton; @property (strong, nonatomic) NSMutableData *responseData; @property (nonatomic, assign) id&lt;DataConnectionDelegate&gt; delegate; -(void)startDataDownloading; - (id)initWithUrl:(NSURL *)_url andDelegate:(id&lt;DataConnectionDelegate&gt;)_delegate; </code></pre> <p>That is a part of the header file.Sorry for late response.</p>
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    1. USZen
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    1. COI think a little bit more code would be needed to see what's going on.
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      1. USMichał Kreft
    2. COActually I'm going to parse an RSS feed link from the URL. So the url contains the URL link.
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      1. USZen
    3. CO@Zen Seconding what @ride.inc said, but I'll elaborate: Even though `responseData` is *supposed* to be a `NSMutableData`, your compiler is telling you it's actually a dictionary. Did you declare `responseData` as a `NSMutableDictionary`, perchance? Is there some place where `responseData` actually wound up storing a reference to a dictionary?
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      1. UStrudyscousin
 

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