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PO"Terminating app due to uncaught exception 'NSInvalidArgumentException'" error with stringByTrimmingCharactersInSet on iPhone
 

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  1. PO"Terminating app due to uncaught exception 'NSInvalidArgumentException'" error with stringByTrimmingCharactersInSet on iPhone
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    <p>I am reading JSON data back from a server, and I am trying to parse a particular string that contains an HTML URL. The data is in an NSString called current_weatherIconUrl2. The console output from Xcode is below:</p> <blockquote> <p>2010-07-06 17:17:46.628 WhatToDo[13437:20b] Current Condition: URL2:("<a href="http://www.worldweatheronline.com/images/wsymbols01_png_64/wsymbol_0001_sunny.png" rel="nofollow noreferrer">http://www.worldweatheronline.com/images/wsymbols01_png_64/wsymbol_0001_sunny.png</a>")</p> </blockquote> <p>What I tried to do is use "stringByTrimmingCharactersInSet" to parse the '(', '"', and also the line feed and newlines, but I am instead getting the NSInvalidArgumentException:</p> <blockquote> <p>2010-06-30 00:18:07.357 WhatToDo[7299:20b] <strong>* Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*</strong> -[NSCFArray stringByTrimmingCharactersInSet:]: unrecognized selector sent to instance 0x3e84970'</p> </blockquote> <p>Here is an extract of the data that is returned from the server (information I want to extract is bolded):</p> <pre><code>2010-07-06 17:17:46.627 WhatToDo[13437:20b] Results: { data = { "current_condition" = ( { cloudcover = 75; humidity = 42; "observation_time" = "08:47 AM"; precipMM = "0.0"; pressure = 1003; "temp_C" = 36; "temp_F" = 97; visibility = 10; weatherCode = 113; weatherDesc = ( { value = Sunny; } ); **weatherIconUrl = ( { value = "http://www.worldweatheronline.com/images/wsymbols01_png_64/wsymbol_0001_sunny.png"; } );** winddir16Point = WSW; winddirDegree = 250; windspeedKmph = 31; windspeedMiles = 19; } ); }; } </code></pre> <p>Here is the code that parses the data into NSString variables.</p> <pre><code>- (void) readWeather { NSLog(@"readWeather started"); NSMutableArray *imageArray = [[NSMutableArray alloc] init]; NSData *jsonObjectString; NSString *completeString = [NSString stringWithFormat: @"http://www.worldweatheronline.com/feed/weather.ashx?key=988ae47cc3062016100606&amp;lat=25.04&amp;lon=121.55&amp;num_of_days=5&amp;format=json", jsonObjectString]; NSLog(@"Weather URL: %@", completeString); NSURL *urlForValidation = [NSURL URLWithString:completeString]; NSMutableURLRequest *validationRequest = [[NSMutableURLRequest alloc] initWithURL:urlForValidation]; [validationRequest setHTTPMethod:@"POST"]; NSData *responseData = [NSURLConnection sendSynchronousRequest:validationRequest returningResponse:nil error:nil]; [validationRequest release]; // Store incoming data into a string NSString *jsonString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding]; // Create a dictionary from the JSON string NSDictionary *results = [jsonString JSONValue]; NSLog(@"Results: %@", results); NSArray *data = [[results objectForKey:@"data"] objectForKey:@"current_condition"]; NSArray *data2 = [[results objectForKey:@"data"] objectForKey:@"weather"]; NSCharacterSet *skipSet = [NSCharacterSet characterSetWithCharactersInString:@"("]; for (NSArray *current_condition in data) { // Get title of the image NSString *temp_C = [current_condition valueForKey:@"temp_C"]; NSString *current_weatherDesc = [current_condition valueForKey:@"weatherDesc"]; NSString *current_weatherIconUrl = [current_condition valueForKey:@"weatherIconUrl"]; NSString *current_weatherIconUrl2= [current_weatherIconUrl valueForKey:@"value"]; //Commented out because this will create an exception: //NSString *current_weatherIconUrl3 = [current_weatherIconUrl2 stringByTrimmingCharactersInSet:skipSet]; //NSLog(@"Current Condition: URL2: %@", *(current_weatherIconUrl3); //Commented out because this will create an exception: //current_weatherIconUrl3 = [current_weatherIconUrl3 stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]; } </code></pre> <p>Can someone tell me what I am doing wrong or if there is a better method than using <code>stringByTrimmingCharactersInSet</code>?</p>
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