Mega Code Archive
Finally - starts the unconditional code section of a try statement
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Try
Statement
{Statement...}
Finally
Statement
{Statement...}
End;
Description
The Finally keyword is used to mark the start of the final block of statements in a Try statement. They are executed regardless of what happens in the Try statements.
However, the Finally clause does not actually handle any exceptions - the program will terminate if no Except clause is found (see notes below).
Try-Finally is normally used by a routine to allow cleanup processing to take place, such as freeing resources, with the exception being correctly passed to the caller to handle.
Notes
There are times when you want a construct like this :
Try
...
Except
...
Finally
...
End;
where exceptions are trapped and acted upon, but in all cases, a set of clean up statements are executed. This can be achieved with nested Try statements :
Try
Try
...
Except
...
End;
Finally
...
End;
Related commands
Except Starts the error trapping clause of a Try statement
On Defines exception handling in a Try Except clause
Raise Raise an exception
Try Starts code that has error trapping
Example code : Zero divide with a finally clause
var
number, zero : Integer;
begin
// Try to divide an integer by zero - to raise an exception
number := -1;
Try
zero := 0;
number := 1 div zero;
ShowMessage('number / zero = '+IntToStr(number));
Finally
if number = -1 then
begin
ShowMessage('Number was not assigned a value - using default');
number := 0;
end;
end;
end;
Show full unit code
Number was not assigned a value - using default
Then, the program terminates with an EDivByZero error message - the finally clause did not trap the error.
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