Convert a JSON NSData to NSDictionary

ios, json, nsdata, nsdictionary, objective-c

Solution

Did you implemented all the delegate methods of NSURLConnectionDelagate.It looks like you are taking the data for conversion from "- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data" delagate method. If so you may get incomplete data and that can not be converted.

Try this:

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    // A response has been received, this is where we initialize the instance var you created
    // so that we can append data to it in the didReceiveData method
    // Furthermore, this method is called each time there is a redirect so reinitializing it
    // also serves to clear it
    lookServerResponseData = [[NSMutableData alloc] init];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    // Append the new data to the instance variable you declared
    [lookServerResponseData appendData:data];
}


- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    // The request is complete and data has been received
    // You can parse the stuff in your instance variable now
    NSError *errorJson=nil;
    NSDictionary* responseDict = [NSJSONSerialization JSONObjectWithData:lookServerResponseData options:kNilOptions error:&errorJson];

     NSLog(@"responseDict=%@",responseDict);

    [lookServerResponseData release];
    lookServerResponseData = nil;
}

Here, lookServerResponseData is instance of NSMutableData declared globally.

Hope it will help.

Problem

I'm using an API service of a web service and it is written in their description that they send JSON data which also matches in my opinion with the response I get from it. Here a part of it which I got from the NSURLConnection-Delegate (connection didReceiveData: (NSData *) data) and converted in a NSString using: ``` NSLog(@"response: %@", [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]); ``` Here the snippet: ``` {"scans": { "Engine1“: { "detected": false, "version": "1.3.0.4959", "result": null, "update": "20140521" }, "Engine2“: { "detected": false, "version": "12.0.250.0", "result": null, "update": "20140521" }, ... }, "Engine13": { "detected": false, "version": "9.178.12155", "result": ``` In the NSLog-String it stops there. Now I would like to know from you whats wrong that I can't convert this data to a JSON Dictionary with this lines of code: ``` NSError* error; NSMutableDictionary *dJSON = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&error]; ``` I experiment with some options but always the same error: ``` Error Domain=NSCocoaErrorDomain Code=3840 "The operation couldn’t be completed. (Cocoa error 3840.)" (Unexpected end of file while parsing object.) UserInfo=0x109260850 {NSDebugDescription=Unexpected end of file while parsing object.} ``` Everything indicates that the JSON packet is incomplete but I don't know how to check it or how to look for the issue which should be located in my code.

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