| Description |
The Exit procedure abruptly terminates the current function or procedure.
If exiting a function, then Result contains the last set value.
Warning : use with caution - jumping is a concept at odds with structured coding - it makes code maintenance difficult.
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| Related commands |
| Break |
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Forces a jump out of a single loop |
| Continue |
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Forces a jump to the next iteration of a loop |
| Goto |
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Forces a jump to a label, regardless of nesting |
| Halt |
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Terminates the program with an optional dialog |
| RunError |
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Terminates the program with an error dialog |
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| Example code : Exit a proc when a user cancels data entry |
// Full Unit code.
// -----------------------------------------------------------
// You must store this code in a unit called Unit1 with a form
// called Form1 that has an OnCreate event called FormCreate.
unit Unit1;
interface
uses
// The System unit does not need to be defined
Forms, Dialogs;
type
TForm1 = class(TForm)
procedure FormCreate(Sender: TObject);
function AskForName: string;
end;
var
Form1: TForm1;
implementation
{$R *.dfm} // Include form definitions
procedure TForm1.FormCreate(Sender: TObject);
begin
// Ask the user for their name
ShowMessage('Name = '+AskForName);
end;
// Ask the user for first and second names
function TForm1.AskForName: string;
var
firstName, secondName : string;
begin
Result := 'Lazy person';
repeat
if not InputQuery('Test program', 'First name :', firstName)
then Exit;
if not InputQuery('Test program', 'Second name :', secondName)
then Exit;
until (firstName <> '') or (secondName <> '');
Result := firstName + ' ' + secondName;
end;
end.
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| Hide full unit code |
If the user cancels from the first or second name dialogs, the ShowMessage dialog gives:
Name = Lazy person
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