Mirror of forum.nim-lang.org

3008 :: echo proper string in different consoles?

• oyster (orginal) [2017-06-19T15:38:56+02:00] view original

  I am a Chinese Windows user.

  I use Msys2+Mingw64 (export LANG="EN.UTF-8") to compile nim app. But I also use windows7 DOS console(the default codepage is cp936, which is almost gb2312). The following code performs different in msys2 and windows's console.

  So my question, how to let the EXE echo properly no matter in whatever consoles? Thanks

  # this file is saved as a UTF8 file
  
  import future, encodings
  
  # this line outputs "你好" in msys which is corrected.
  # but "浣犲ソ" in windows' console which is wrong
  echo "你好"
  
  
  # this outputs "▒▒▒" in msys which is wrong.
  # but "你好" in DOS which is corrected
  echo convert("你好", "gb2312", "utf8")
  
  Run

---

• planhths (orginal) [2017-06-19T20:39:12+02:00] view original

  You need to use proc getCurrentEncoding(). This file has exactly what you need https://github.com/retsyo/xlsx2csv/blob/master/develop/xlsx2csv.nim

---

• Araq (orginal) [2017-06-19T22:45:31+02:00] view original

  Are you sure? getCurrentEncoding maps to some Windows API call but how does the Windows API know about Msys2's non-standard default encoding?

---

• oyster (orginal) [2017-06-20T07:27:30+02:00] view original

  actually I have tested getCurrentEncoding, which gives gb2312 in both msys and DOS as Araq says. So what is the solution?

---

• Araq (orginal) [2017-06-20T13:55:44+02:00] view original

  Don't use msys? Seems to be bad software. ;-)

---

• Krux02 (orginal) [2017-06-20T17:47:30+02:00] view original

  Don't use Windows. Seems to be bad software ;)

  No seriously. I have no idea. I can only guess what to look for. Does msys2 try to make getCurrentEncoding behave correctly? Does msys2 try to make everything more unix like and make the shell utf8? Does msys2 have any information about encoding?

---

• zolern (orginal) [2017-06-21T15:59:11+02:00] view original

  I have similar problem, but with Cyrillic output on several Windows (XP, 7, 10). The best I did was to use low level routine SetOutputConsole to control the output. You can use GetOutputConsole to save current setting and restore it on application end. I hope something like this will be useful for you:

  module console.nim:

  # Low-level & OS specific routines
  proc getConsoleOutputCP(): cint
     {. importc: "GetConsoleOutputCP", stdcall, dynlib: "kernel32" discardable .}
  proc setConsoleOutputCP(codepage: cint): cint
     {. stdcall, dynlib: "kernel32", importc: "SetConsoleOutputCP", discardable .}
  
  let originalOutCP = getConsoleOutputCP()
  
  proc setConsole*(codepage: cint = 65001)  =
     setConsoleOutputCP(codepage)
  
  proc restoreConsole* =
     setConsoleOutputCP(originalOutCP)
  Run

  Application:

  import console
  
  setConsole(936)
  
  echo "你好"
  
  restoreConsole()
  Run

---

• Tiberium (orginal) [2017-06-21T20:06:07+02:00] view original

  There's a simpler way to change the codepage :)

  import os
  discard execShellCmd("chcp 936")
  Run

---

• oyster (orginal) [2017-06-22T06:52:57+02:00] view original

  thanks but set cp936 seems do not work in msys2

  https://github.com/zacharycarter/blt-nim may be a solution for simple console-like interactive

---