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   ► KBProgrammingDelphi PrismLanguage Det...   Print This     
  From the May 2010 Issue of Prestwood eMag
 
Prism Language Details:
Delphi Prism Exception Trapping (try..except, try..finally)
 
Posted 11 years ago on 2/15/2009
Prism Code Snippet:
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KB101917

Languages Focus: Exception Trapping

A common usage of exception handling is to obtain and use resources in a "try-it" block, deal with any exceptions in an "exceptions" block, and release the resources in some kind of "final" block which executes whether or not any exceptions are trapped.

Delphi Prism Exception Trapping

Use a try..except..end block to trap and process errors.

Delphi also offers a try...finally where code will execute in the finally section no matter what. It's common to put a try..except inside a try..finally.

Syntax Example:
try
  var y: Integer;
  y := 0;
  y := 1/y;
except
  MessageBox.Show("You cannot divide by zero.");
end;

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Code Contributed By Mike Prestwood:

Mike Prestwood is a drummer, an author, and creator of the PrestwoodBoards online community. He is the President & CEO of Prestwood IT Solutions. Prestwood IT provides Coding, Website, and Computer Tech services. Mike has authored 6 computer books and over 1,200 articles. As a drummer, he maintains play-drums.com and has authored 3 drum books. If you have a project you wish to discuss with Mike, you can send him a private message through his PrestwoodBoards home page or call him 9AM to 4PM PST at 916-726-5675 x205.

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