Hello, To make the purpose of Boost.Nowide more clear I'll add an example from the docs. Let's write a simple program that confirms the C++2011 or C++2003 standard that counts a number of lines in the file: #include <fstream> #include <iostream> int main(int argc,char **argv) { if(argc!=2) { std::cerr << "Usage: file_name" << std::endl; return 1; } std::ifstream f(argv[1]); if(!f) { std::cerr << "Can't open a file " << argv[1] << std::endl; return 1; } int total_lines = 0; while(f) { if(f.get() == '\n') total_lines++; } f.close(); std::cout << "File " << argv[1] << " has " << total_lines << " lines" << std::endl; return 0; } Any Bugs? This trivial program would not work on Windows if the file name is Unicode file name, argv - does not hold Unicode string, std::ifstream can't open Uicode file name and std::cout can't print Unicode characters to the console... Boost.Nowide provides an alternative for common standard library function and suggest a general pattern to handle Unicode strings in the cross platform program: #include <boost/nowide/fstream.hpp> #include <boost/nowide/iostream.hpp> #include <boost/nowide/args.hpp> int main(int argc,char **argv) { // // Fix arguments - argv holds Unicode string (UTF-8) // boost::nowide::args a(argc,argv); if(argc!=2) { boost::nowide::cerr << "Usage: file_name" << std::endl; return 1; } // // Fix fstream it can open a file using Unicode file name (UTF-8) // boost::nowide::ifstream f(argv[1]); if(!f) { // // cerr can print Unicode characters to console regardless console code page // boost::nowide::cerr << "Can't open a file " << argv[1] << std::endl; return 1; } int total_lines = 0; while(f) { if(f.get() == '\n') total_lines++; } f.close(); // // cout can print Unicode characters to console regardless console code page // boost::nowide::cout << "File " << argv[1] << " has " << total_lines << " lines" << std::endl; return 0; } This is the general approach, it also provides glue conversion functions to handle Unicode on API boundary level where needed #ifdef _WIN32 bool copy_file(std::string const &src,std::string const &tgt) { return CopyFileW(boost::nowide::convert(src).c_str(), boost::nowide::convert(tgt).c_str(), TRUE); } #else bool copy_file(std::string const &src,std::string const &tgt) { // POSIX implementation } #endif Waiting for Comments: Download: http://cppcms.com/files/nowide/nowide.zip Documents: http://cppcms.com/files/nowide/html/ Artyom Beilis -------------- CppCMS - C++ Web Framework: http://cppcms.com/ CppDB - C++ SQL Connectivity: http://cppcms.com/sql/cppdb/
Hello all Booster,
I wan to get comments on a library that I want to submit for a formal review.
The library provides an implementation of standard C and C++ library functions such that their inputs are UTF-8 aware on Windows without requiring using Wide API to make program work on Windows.
Library: Boost.Nowide Download: http://cppcms.com/files/nowide/nowide.zip Documents: http://cppcms.com/files/nowide/html/ Features: http://cppcms.com/files/nowide/html/index.html#main_the_solution
Tested On:
OS: Windows 7 32/64 bit, Linux Compilers: GCC-4.6, MSVC-10