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POObjective-c Substring Range Exception
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  1. POObjective-c Substring Range Exception
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    copied!<p>I am creating an imap client. I want to parse body and header of incoming data but it crashes. I couldn't understand why it crashes and gives substring out of range error. How can I fix it?</p> <p>I only want to check if the incoming string contains "FETCH" so I parse data, since string comes like * FETCH or * 1 FETCH I thought checking isEqualToString range of (4,6) would be enough but that didn't work.</p> <pre><code>- (NSString*) readLine { NSMutableData* data = [[NSMutableData alloc] init]; unsigned char c; for (;;) { recv(socket_, &amp;c, sizeof(c), 0); if (c == '\n') { NSString* s = [[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding]; NSString *str = [s substringWithRange:NSMakeRange(4, 6)]; if( [str isEqualToString:@"FETCH "]){ NSMutableArray *substrings = [NSMutableArray new]; NSScanner *scanner = [NSScanner scannerWithString:s]; [scanner scanUpToString:@"}" intoString:nil]; while(![scanner isAtEnd]) { NSString *substring = nil; [scanner scanString:@"}" intoString:nil]; if([scanner scanUpToString:@"*" intoString:&amp;substring]) { // If the space immediately followed the }, this will be skipped [substrings addObject:substring]; } [scanner scanUpToString:@"}" intoString:nil]; // Scan all characters before next } } NSString *email; [emailList addObject:@"Select an Email"]; for(int i=0; i&lt;substrings.count;i++){ email = [substrings objectAtIndex:i]; [emailList addObject:email]; // add emails in emailList } [substrings release]; } if (nil != s) { NSLog(@"%@",s); } [data release]; return [s autorelease]; } else { [data appendBytes: &amp;c length: 1]; } } return nil; } </code></pre> <p>output is:</p> <pre><code>* 1 FETCH (BODY[HEADER.FIELDS (FROM SUBJECT DATE)] {149} 2011-11-07 23:32:24.363 SwitchDeneme[327:bc03] Date: Mon, 07 Nov 2011 17:00:25 -0500 (EST) 2011-11-07 23:32:24.364 SwitchDeneme[327:bc03] From: "AOLWelcomeInfo" &lt;AOLWelcomeInfo@message.aol.com&gt; 2011-11-07 23:32:24.365 SwitchDeneme[327:bc03] Subject: Welcome to Your New Email Account! 2011-11-07 23:32:24.367 SwitchDeneme[327:bc03] *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[NSCFString substringWithRange:]: Range or index out of bounds' terminate called throwing an exceptionsharedlibrary apply-load-rules all </code></pre>
 

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