如何在 Perl 中检索终端宽度? [英] How do I retrieve the terminal width in Perl?

问题描述

我想输出一个进度条，但如何在 Perl 中检索终端宽度?

I want to output a progress bar, but how do I retrieve the terminal width in Perl?

首选核心 Perl 解决方案，因为我无法访问编译器，只能使用已安装的 5.8.2 Perl.

A core Perl solution would be preferred, since I don't have access to a compiler, just an already installed 5.8.2 Perl.

推荐答案

Perl 附带的 FAQ 对这个问题有答案.如果你运行 perldoc -q "screen size"，你会得到以下内容:

The FAQ which ships with Perl has the answer to this question. If you run perldoc -q "screen size", you'll get the following:

如何获取屏幕尺寸?

如果您从 CPAN 安装了 Term::ReadKey 模块，您可以使用它来获取以字符和像素为单位的宽度和高度:

If you have Term::ReadKey module installed from CPAN, you can use it to fetch the width and height in characters and in pixels:

use Term::ReadKey;
($wchar, $hchar, $wpixels, $hpixels) = GetTerminalSize();

这比原始的ioctl"更具可移植性，但不是说明性的:

This is more portable than the raw "ioctl", but not as illustrative:

require 'sys/ioctl.ph';
die "no TIOCGWINSZ" unless defined &TIOCGWINSZ;
open(TTY, "+</dev/tty") or die "No tty: $!";
unless (ioctl(TTY, &TIOCGWINSZ, $winsize='')) {
    die sprintf "$0: ioctl TIOCGWINSZ (%08x: $!)
", &TIOCGWINSZ;
}
($row, $col, $xpixel, $ypixel) = unpack('S4', $winsize);
print "(row,col) = ($row,$col)";
print "  (xpixel,ypixel) = ($xpixel,$ypixel)" if $xpixel || $ypixel;
print "
";

所以如果你想要一个纯 Perl 解决方案，你可以使用最后一个，或者安装 Term::ReadKey 来自 CPAN，如果您想在代码中使用更简单的解决方案，但需要更多的前期设置.

So you can use the last one if you want a pure Perl solution, or install Term::ReadKey from CPAN if you want a simpler solution in your code but more up-front set-up.

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