使用 chcp 65001 打印的 Windows UTF-8 - 字符神秘地重复 [英] Windows UTF-8 printed with chcp 65001 - characters are mysteriously duplicated
问题描述
有一件事我无法理解:
我使用的是 Windows 7 和 Strawberry Perl 5.20，我想使用 chcp 65001 将 UTF-8 写入控制台 (cmd.exe).
I am using Windows 7 and Strawberry Perl 5.20, and I want to write UTF-8 to the console (cmd.exe) with chcp 65001.
UTF-8 字符本身很好，甚至 >255，但是有些字符存在神秘的重复(这只会在我不重定向到文件时发生)
The UTF-8 characters themselves are coming out fine, even >255, but there is a mysterious duplication of some caracters (this only happens if I don't redirect into a file)
我现在在 last-octet-repeated-when-my-perl-program-outputs-a-utf-8 -- 解决方案是将 binmode(STDOUT, 'unix:encoding(utf8):crlf') 注入 perl 程序——我已经测试过了，现在工作正常
I now have seen another post that had essentially the same problem at last-octet-repeated-when-my-perl-program-outputs-a-utf-8 -- the solution is to inject a binmode(STDOUT, 'unix:encoding(utf8):crlf') into the perl program -- I have tested and it works fine now
感谢所有研究这个奇怪问题的人.
Thanks to everybody who looked into this weird problem.
简而言之，当我重定向到平面文件时，我正在编写一个 UTF-8 字符串 (chr(300) x 3).chr(301)."UVW\x{0D}\x{0A}"然后打印平面文件，一切正常.
In a nutshell, I am writing a UTF-8 string (chr(300) x 3).chr(301)."UVW\x{0D}\x{0A}", when I redirect into a flat file and then print the flat file, everything is fine.
但是，当我直接打印到控制台时，有些字符神秘地重复了(我说的是单独一行中的字符VW")，不知道为什么
However, when I print directly to the console, some characters are mysteriously duplicated (I am talking about the characters "VW" in the seperate line), and I don't know why
这是我的测试输出
Page de codes active : 65001
Redirected into a file:
-----------------------
ĬĬĬĭUVW
Printed directly:
-----------------
ĬĬĬĭUVW
VW
IO-Layers = (unix crlf)
C4ACC4ACC4ACC4AD5556570D0A
这是我的测试程序:
@echo off
chcp 65001
echo.
set H1=BEGIN{binmode(*STDIN); undef $/;
set HEXDUMP="%H1% print uc(unpack('H*',<STDIN>)), qq{\n}}"
set L1=my @l = PerlIO::get_layers(*STDOUT, output, 1);
set LAYERS="%L1% print {*STDERR} qq{IO-Layers = (@l)\n};"
set PROG="print chr(300) x 3, chr(301), qq{UVW\n};";
set TFILE=%TEMP%\tfile.txt
echo Redirected into a file:
echo -----------------------
perl -C6 -e%PROG% >%TFILE% && type %TFILE%
echo.
echo Printed directly:
echo -----------------
perl -C6 -e%PROG%
echo.
perl -e%LAYERS%
echo.
perl -e%HEXDUMP% <%TFILE%
echo.
pause
正如我所说，字符本身打印正确，但为什么会出现这种神秘的重复?...以及为什么 * 只有 * 如果没有重定向到文件中?
As I said, the characters themselves are printed correctly, but why is there this mysterious duplication ? ...and why * only * if not redirected into a file ?
推荐答案
正如我所怀疑的，这已被报告为 Windows 软件中的故障:
As I suspected, this has been reported as a failure in Windows software:
这是由 Windows 中的错误引起的.当写入设置为代码页 65001 的控制台时，WriteFile() 返回写入的字符数而不是字节数.
This is caused by a bug in Windows. When writing to a console set to code page 65001, WriteFile() returns the number of characters written instead of the number of bytes.
我不知道有一种变通方法，但是如果 :unix:encoding(utf8):crlf PerlIO 堆栈适合您，那么您似乎已经找到了.
I wasn't aware of a work-around, but if the :unix:encoding(utf8):crlf PerlIO stack works for you then it seems you have found one.
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