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procedure TForm3.FormResize(Sender: TObject);
begin
    if Assigned(NewThread) then
      if not NewThread.Binfertig then NewThread.Binfertig:= true;

    .....
    .....
end;					

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while (buflen > 0) and (not terminated) do
begin
    while rc >= 1 do
    begin
        if Fbinfertig then terminate;
        .....
        .....
    end;
    .....
    .....
end;					

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FreeAndNil(NewThread);					

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procedure TForm3.FormResize(Sender: TObject);
begin
   if Assigned(NewThread) then
   begin
      if not NewThread.Binfertig then
      begin
         NewThread.Terminate;
         NewThread.WaitFor;
         FreeAndNil(NewThread);
      end;
     //if not NewThread.Binfertig then NewThread.Binfertig:= true;
   end;
   ....
   ....
end;