從兩個HEX對生成UTF-8字符

Question

我正在嘗試從2個十六進制對中生成UTF-8字符。 十六進制對來自字符串。

此代碼有效：

use Encode;

my $bytes = "\xC3\xA9";
print decode_utf8($bytes);

# Prints: é and is correct

此代碼不起作用：

use Encode;

my $byte1 = "C3";
my $byte2 = "A9";
my $bytes = "\x$byte1\x$byte2";
print decode_utf8($bytes);

這是我嘗試生成的字符： http : //www.fileformat.info/info/unicode/char/00e9/index.htm

感謝您的提示！

Answer 1

use Encode;

my $byte1 = "C3";
my $byte2 = "A9";
my $bytes = chr(hex($byte1)) . chr(hex($byte2));
print decode_utf8($bytes);

Answer 2

將字符串文字視為一種迷你語言。 你做不到

"\x$hex"

力所能及

my $for = 'for';
$for (1..4) { }

但是有很多方法可以做您想要的。

my $bytes = join '', map chr hex, @bytes_hex;
my $bytes = pack 'C*', map hex, @bytes_hex;
my $bytes = pack '(H*)*', @bytes_hex;

Answer 3

亞哈（Yahth）打敗了我：

#!/usr/bin/env perl

use strict;
use warnings;

use Encode;
use utf8::all;

my $byte1 = "C3";
my $byte2 = "A9";
my $bytes = join '', map {chr hex} $byte1, $byte2;

print decode_utf8($bytes);