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POfunction to get the file name of an URL
 

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  1. POfunction to get the file name of an URL
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    <p>I have some source code to get the file name of an url</p> <p>for example:</p> <p><a href="http://www.google.com/a.pdf" rel="noreferrer">http://www.google.com/a.pdf</a></p> <p>I hope to get a.pdf</p> <p>because the way to join 2 NSStrings I can get is 'appendString' which only for adding a string at right side, so I planned to check each char one by one from the right side of string '<a href="http://www.google.com/a.pdf" rel="noreferrer">http://www.google.com/a.pdf</a>', when it reach at the char '/', stop the checking, return string fdp.a , after that I change fdp.a to a.pdf</p> <p>source codes are below</p> <pre><code>-(NSMutableString *) getSubStringAfterH : originalString:(NSString *)s0 { NSInteger i,l; l=[s0 length]; NSMutableString *h=[[NSMutableString alloc] init]; NSMutableString *ttt=[[NSMutableString alloc] init ]; for(i=l-1;i&gt;=0;i--) //check each char one by one from the right side of string 'http://www.google.com/a.pdf', when it reach at the char '/', stop { ttt=[s0 substringWithRange:NSMakeRange(i, 1)]; if([ttt isEqualToString:@"/"]) { break; } else { [h appendString:ttt]; } } [ttt release]; NSMutableString *h1=[[[NSMutableString alloc] initWithFormat:@""] autorelease]; for (i=[h length]-1;i&gt;=0;i--) { NSMutableString *t1=[[NSMutableString alloc] init ]; t1=[h substringWithRange:NSMakeRange(i, 1)]; [h1 appendString:t1]; [t1 release]; } [h release]; return h1; } </code></pre> <p>h1 can reuturn the coorect string a.pdf, but if it returns to the codes where it was called, after a while system reports 'double free *** set a breakpoint in malloc_error_break to debug'</p> <p>I checked a long time and foudn that if I removed the code </p> <p>ttt=[s0 substringWithRange:NSMakeRange(i, 1)];</p> <p>everything will be Ok (of course getSubStringAfterH can not returns the corrent result I expected.), no error reported.</p> <p>I try to fix the bug a few hours, but still no clue.</p> <p>Welcome any comment</p> <p>Thanks interdev </p>
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