//如果有这样一个循环, 是非常可怕的; 因为它完不了, 你得等着.
procedure TForm1.Button1Click(Sender: TObject);
var
i: Integer;
begin
for i := 0 to MaxInt do
begin
Text := IntToStr(i);
end;
end;/
/即使这样也无济于事, 因为在循环期间你执行不了Button2Click
var
b: Boolean;
procedure TForm1.Button1Click(Sender: TObject);
var
i: Integer;
begin
b := True;
for i := 0 to MaxInt do
begin
if b then
Text := IntToStr(i)
else
Exit;
end;
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
b := False;
end;
//如果在循环期间...
for i := 0 to MaxInt do
begin
if b then
Text := IntToStr(i)
else
Exit;
{看看还有其他什么事情发生}
end;
//Application.ProcessMessages 就是干这个的!
var b: Boolean;
procedure TForm1.Button1Click(Sender: TObject);
var
i: Integer;
begin
b := True;
for i := 0 to MaxInt do
begin
if b then
Text := IntToStr(i)
else
Exit;
Application.ProcessMessages;
{!}
end;
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
b := False;
end;