iOS NSScanner scanUpToString

Hi !

I am working with NSScanner .

NSScanner *scanner = [NSScanner scannerWithString: myData];
[scanner scanUpToString"valid" intoString:&temp];

Now in case there is no "valid" string in the search the software crashes saying "Terminated due to Uncaught Exception".

Please help, send me suggestion.
Is there something like try-catch in obective-C?

Handling Exceptions

Thank you!

the link you send me seems helpful.

Vidya.