Re: Is it difficult to read UTF-8 .txt in VC++?

"Mateusz Loskot" <>
Sat, 07 Jul 2007 18:44:05 +0200
On Fri, 06 Jul 2007 19:47:41 +0200, Sin Jeong-hun <> =


I want to read a line from a .txt file (which is saved in
Unicode(UTF-8) and show the string in a MessageBox.
With C#, it is very easy.

StreamReader sr=new StreamReader("c:\\a.txt",Encoding.UTF8);
string line=sr.ReadLine();

But with unmanaged Visual C++, I couldn't even find a simple example.
Do I really need to buy a library just to read simple UTF-8 text file?=

No, you don't need to buy anything.

For solving problems like this, I usually use UTF8-CPP library.
It's just a single header file (+ 3 utility headers), no binaries.

1. Go to the website and download UTF8-CPP 2.0
2. Unpack and add utf8 directory to "Additional Include Directories"
of your project.
3. Use it as follows (and read manual for more complete reference):

// Project properties: General -> Character Set -> Unicode
#include <cassert>
#include <fstream>
#include <iostream>
#include <string>
#include <utf8.h> // UTF8-CPP
#include <windows.h> // MessageBox()

int _tmain(int argc, _TCHAR* argv[])
     char const* path = "utf8.html"; // UTF-8 encoded

     // Read UTF-8 file
     std::ifstream fs8(path);
     assert(fs8.is_open() && "Could not open");

     std::string line;
     std::getline(fs8, line);
     assert(utf8::is_valid(line.begin(), line.end()) && "Invalid UTF-8 =


     // Convert UTF-8 string to UTF-16
     std::wstring msg;
     utf8::utf8to16(line.begin(), line.end() , std::back_inserter(msg));=

     ::MessageBox(NULL, msg.c_str(), _T("Test"), MB_OK);

     return 0;

-- =

Mateusz Loskot

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