Try
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Back to Reserved words.
The reserved word try
is part of either a try
..finally
block or a
try
..except
block.
If an exception occurs while executing the code between try
and
finally
, execution resumes at finally
. If no exception occurs, the code between finally
and
end
will be executed also.
try
// code that might generate an exception
finally
// will always be executed as last statements
end;
Whenever an exception occurs, the code between except
and end
will be executed.
try
// code that might generate an exception
except
// will only be executed in case of an exception
on E: EDatabaseError do
ShowMessage( 'Database error: '+ E.ClassName + #13#10 + E.Message );
on E: Exception do
ShowMessage( 'Error: '+ E.ClassName + #13#10 + E.Message );
end;
To handle exceptions with an except
block and also run a finally
block, nest one try
block in another.
try
try
// code dealing with database that might generate an exception
except
// will only be executed in case of an exception
on E: EDatabaseError do
ShowMessage( 'Database error: '+ E.ClassName + #13#10 + E.Message );
on E: Exception do
ShowMessage( 'Error: '+ E.ClassName + #13#10 + E.Message );
end;
finally
// clean up database-related resources
end;