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narrowing wstrings

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Started by slyterence November 10, 2005 06:46 AM

1 comment, last by slyterence 18 years, 5 months ago

slyterence

100

Author

November 10, 2005 06:46 AM

Hi, I'm trying to write a wide string into a std::ostringstream as follows


for(int i = 0; i < temp.length(); ++i)
{
	oss << oss.narrow(temp, '%');
}

and I get the following error:


c:\...\file.cpp : warning C4244: 'argument' : conversion from 'std::allocator<_Ty>::value_type' to 'char', possible loss of data
        with
        [
            _Ty=wchar_t
        ]

Is there a better (standard) way of doing this? Particularly, I'd prefer to convert the wstring into a string, and then just append that to the ostringstream, because then I can reuse the narrowing conversion wherever I want from a conversion class. I tried boost::lexical_cast, but that didn't work, so I'm a bit stumped. Thanks

We scratch our eternal itchA twentieth century bitchWe are grateful forOur Iron Lung

Code-R

136

November 10, 2005 08:30 AM

here's something I made that we use at work:

//# Sherief "JD" N. Farouk//# Created: Saturday, August 13, 2005, 3:33:37 PM//# Last Modified: Monday, August 15, 2005, 9:50:54 PM//# ext-h-gen-dep-std-boost-nolib#ifndef __EXT_LEXICAL_CAST_H__#define __EXT_LEXICAL_CAST_H__#pragma once#include <string>#include <locale>#include <boost/lexical_cast.hpp>namespace boost{	template<>    std::wstring lexical_cast<std::wstring, std::string>(std::string arg)    {		std::wstring result;		std::locale loc;		for(unsigned int i= 0; i < arg.size(); ++i)		{			result += std::use_facet<std::ctype<wchar_t> >(loc).widen(arg);		}		return result;    }	template<>    std::string lexical_cast<std::string, std::wstring>(std::wstring arg)    {		std::string result;		std::locale loc;		for(unsigned int i= 0; i < arg.size(); ++i)		{			result += std::use_facet<std::ctype<wchar_t> >(loc).narrow(arg);		}		return result;    }}#endif

Hope you find it useful.

slyterence

100

Author

November 11, 2005 12:58 AM

Works like a bomb! Thank you.

We scratch our eternal itchA twentieth century bitchWe are grateful forOur Iron Lung

narrowing wstrings

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