Re: Delphi threading


A few comments (although I'm not a thread expert <g>) ...

1 If FreeOnTerminate is true then the thread will free itself when
Execute completes. But note that if Execute is a lengthy procedure then
its code should check Terminated during its execution so that it exits
immediately in a well-behaved manner..

2 Any call to VCL code (such as ShowMessage) must be executed in the
context of the VCL thread because Delphi is not thread-safe. "Executing
in the context of VCL thread" is done by enclosing your call in a
procedure refereced in a call to Synchronize. ie

procedure TMyThread.DisplayMessage;
begin
ShowMessage('SomeThreadValue : ' + IntToStr(SomeThreadValue));
end;

procedure TMyThread.Execute;
begin
// whatever
Synchronize(DisplayMessage);
// whatever
end;

Alan Lloyd

.

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