string转wstring

#include <string>
std::string ws2s(const std::wstring& ws)
{
    std::string curLocale = setlocale(LC_ALL, NULL);        // curLocale = "C";
    setlocale(LC_ALL, "chs");
    const wchar_t* _Source = ws.c_str();
    size_t _Dsize = 2 * ws.size() + 1;
    char *_Dest = new char[_Dsize];
    memset(_Dest,0,_Dsize);
    wcstombs(_Dest,_Source,_Dsize);
    std::string result = _Dest;
    delete []_Dest;
    setlocale(LC_ALL, curLocale.c_str());
    return result;
}

std::wstring s2ws(const std::string& s)
{
    setlocale(LC_ALL, "chs"); 
    const char* _Source = s.c_str();
    size_t _Dsize = s.size() + 1;
    wchar_t *_Dest = new wchar_t[_Dsize];
    wmemset(_Dest, 0, _Dsize);
    mbstowcs(_Dest,_Source,_Dsize);
    std::wstring result = _Dest;
    delete []_Dest;
    setlocale(LC_ALL, "C");
    return result;
}

　　

Unicode下wstring（wchar_t*）和string（char *）转换

#include<string>
using namespace std;

//将string转换成wstring
wstring string2wstring(string str)
{
	wstring result;
	//获取缓冲区大小，并申请空间，缓冲区大小按字符计算
	int len = MultiByteToWideChar(CP_ACP, 0, str.c_str(), str.size(), NULL, 0);
	TCHAR* buffer = new TCHAR[len + 1];
	//多字节编码转换成宽字节编码
	MultiByteToWideChar(CP_ACP, 0, str.c_str(), str.size(), buffer, len);
	buffer[len] = '\0';				//添加字符串结尾
	//删除缓冲区并返回值
	result.append(buffer);
	delete[] buffer;
	return result;
}

//将wstring转换成string
string wstring2string(wstring wstr)
{
	string result;
	//获取缓冲区大小，并申请空间，缓冲区大小事按字节计算的
	int len = WideCharToMultiByte(CP_ACP, 0, wstr.c_str(), wstr.size(), NULL, 0, NULL, NULL);
	char* buffer = new char[len + 1];
	//宽字节编码转换成多字节编码
	WideCharToMultiByte(CP_ACP, 0, wstr.c_str(), wstr.size(), buffer, len, NULL, NULL);
	buffer[len] = '\0';
	//删除缓冲区并返回值
	result.append(buffer);
	delete[] buffer;
	return result;
}