Entries tagged Windows

Some .CHM files may not render properly on Windows Vista and Windows 7

Posted on Jan 1, 2015

From http://support.microsoft.com/kb/2021383

When attempting to open a Compiled HTML Help (.CHM) file on Windows Vista or Windows 7, the file may open but display one of the following messages instead of the expected content:

– Navigation to the webpage was canceled.
– Action canceled.

This will occur if the .CHM file has been flagged as downloaded from an untrusted source, such as the Internet.

To resolve this issue, carry out the following steps:

– Right-click the .CHM file and choose Properties
– On the General tab, click the button labeled “Unblock”
– Click OK

Conversion between UTF-16 and UTF-8 in C++

Posted on Jun 5, 2014

#include <fstream>
#include <iostream>
#include <string>
#include <locale>
#include <codecvt>

// Unicode representation in MS Windows uses the 2-byte wchar_t type.
std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>, wchar_t> utfconv;

// string conversion
std::wstring wide = L"Hello, World! 안녕하세요?";  // wide string with utf-16 encoding
std::string narrow = utfconv.to_bytes(wide);     // conversion from utf-16 to utf-8
wide = utfconv.from_bytes(narrow);               // back from utf-8 to utf-16

// conversion during file I/O
std::wofstream fout;                             // wide output stream
fout.open("test.txt", fout.out);
fout.imbue(std::locale(fout.getloc(), new std::codecvt_utf8_utf16<wchar_t>));
fout << wide << std::endl;                       // this stream is stored as utf-8
fout << utfconv.from_bytes(narrow) << std::endl; // the same as the above line

std::wifstream fin;
fin.open("test.txt", fin.in);
fin.imbue(std::locale(fin.getloc(), new std::codecvt_utf8_utf16<wchar_t>));
std::wstring hello, world, anyoung, tline;
fin >> hello >> world >> anyoung;      // utf-8 stream is converted to utf-16 string
std::getline(fin, tline);              // read out the end of the line
std::getline(fin, tline);              // read the next line

Printing Unicode strings in Windows console

Posted on May 12, 2014

Win32 Console Applications do not display Unicode strings properly. There is a simple solution of using _setmode(). You need to include two headers.

#include <io.h>
#include <fcntl.h>

int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
	_setmode(_fileno(stdout), _O_U16TEXT);

	wcout << L"안녕하세요?" << endl;
	// or
	// wprintf(L"%s\n", L"안녕하세요?");

	return 0;