Perl/TkFAQ-12.8如何在程序中鸣笛？

原文：

12.8. How do I ring the bell?

The short answer is $widget -> bell;

A slightly longer answer might include a fully functioning script: #!/usr/bin/perl use Tk; $main = MainWindow -> new; $butn = $main->Button(-text => 'bell') $butn->configure(-command => sub{ $butn->bell; }); $butn->pack(); MainLoop;

An even longer answer would be a fully functioning script with a callback: #!/usr/bin/perl use Tk; $main = MainWindow -> new; $but = $main->Button(-text => 'bell', -command => sub{ringit($main)})->pack; MainLoop; sub ringit { my $m = shift; $m->bell; }

Simon Galton mailto:galtons@candu.aecl.ca reminds us to be careful in that

some systems remap this [the "console bell"] to anything from a digital sound to a flash on the screen.

译文：

12.8 如何在程序中鸣笛？

简单的说就是使用下面的方法：

$widget -> bell;

下面的脚本包含了一个完整的子程序，可以作为一个简洁而全面的答案：

#!/usr/bin/perl

use Tk;

$main = MainWindow -> new;

$butn = $main->Button(-text => 'bell');

$butn->configure(-command => sub{ $butn->bell; });

$butn->pack();

MainLoop;

作为更加全面的回答，下面的例子中还包含了一个实名子程序作为回应函数：

#!/usr/bin/perl

use Tk;

$main = MainWindow -> new;

$but = $main->Button(-text => 'bell',

-command => sub{ringit($main)})->pack;

MainLoop;

sub ringit {

my $m = shift;

$m->bell;

}

Simon Galton提醒我们注意，在有些系统中，这种控制台的鸣笛操作可能被诸如一个数字化的声音（？）或甚至是一些屏幕输出所取代。