CODEWITHSUNDEEP
c++visual-studioutf-8wxwidgets
Vasilly.Prokopyev
Vasilly.Prokopyev

Reputation: 874

WxWidgets with Visual Studio and Unicode Sources

Following the UTF-8 everywhere manifesto, and mostly its part: how to do text on Windows, I've created this simple example with wxWidgets. I wanted wxWidgets to interpret string literals as UTF-8 strings, but it seems, that library gets me wrong.

single source file - main.cpp, encoded as UTF-8 without signature (in msvc terminology):

#include <wx/wx.h>

class Mainw: public wxFrame
{
public:
   Mainw(wxWindow * parent, wxWindowID wxId, const wxString & label)
      : wxFrame(parent, wxId, label)
   {
      wxBoxSizer * sizer = new wxBoxSizer(wxHORIZONTAL);
      sizer->Add(new wxTextCtrl(this, wxID_ANY, wxT("Кириллица")), 1, wxEXPAND | wxALL, 5);
      this->SetSizer(sizer);
   }
};


class MyApp: public wxApp
{
public:
   bool OnInit()
   {
      Mainw *f = new Mainw(NULL, wxID_ANY, wxT("Frame"));
      f->Show();
      return true;
   }
};


IMPLEMENT_APP(MyApp)

Preprocessor Definitions:

UNICODE
_UNICODE
WIN32
__WXMSW__
_WINDOWS
_DEBUG
__WXDEBUG__
wxUSE_UNICODE=1
WXUSINGDLL=1

Linked with WxWidgets Library version 3.0.2

Headers - http://sourceforge.net/projects/wxwindows/files/3.0.2/wxWidgets-3.0.2_headers.7z/download

Binaries - http://sourceforge.net/projects/wxwindows/files/3.0.2/binaries/wxMSW-3.0.2_vc90_Dev.7z/download

Being run, this example produces window with text Кириллица, instead of Кириллица (there was something similar, but it changed to this, when I tried to select it to copy here). It means, that wxWidgets fails to interpret my string literal as UTF-8, but interprets it as something else - maybe as text in system encoding which is windows-1251.

Is there any way to change this behavior of library to match utf-8 everywhere manifesto?

Conclusion:

I gave up. I managed to build library with msvc and flag wxUSE_UNICODE_UTF8 but it would not help without some complex changes in library configuration headers. It seems, that this option is POSIX only

Upvotes: 1

Views: 618

Answers (1)

VZ.
VZ.

Reputation: 22688

Is there any way to change this behavior of library to match utf-8 everywhere manifesto?

No, not under Windows because Windows doesn't support UTF-8 locales (in principle, they could be emulated by the CRT, but AFAIK no compiler does it) and wxString(const char*) ctor interprets the string in the current locale encoding by default.

There are two simple solutions however:

  1. Use wxString::FromUTF8() explicitly.
  2. Use wxString(const wchar_t*) ctor with L"..." wide char argument.

Just for completeness, you also might force the library into accepting UTF-8 narrow text by rebuilding it with wxUSE_UTF8_LOCALE_ONLY=1, but I'm far from sure if this is going to work because the CRT locale will still be different and so using non-ASCII characters with any CRT functions will most likely not work as expected, so I definitely do not recommend doing this unless you're just curious to see what happens.

Upvotes: 2

Related Questions