几种C++ std::string和std::wstring相互转换的转换方法

几种C++ std::string和std::wstring相互转换的转换方法

几种C++ std::string和std::wstring相互转换的转换方法
第一种方法：调用WideCharToMultiByte()和MultiByteToWideChar()，代码如下（关于详细的解释，可以参考《windows核心编程》）：
#include <string>

#include <windows.h>

using namespace std;

//Converting a WChar string to a Ansi string

std::string WChar2Ansi(LPCWSTR pwszSrc)

{

int nLen = WideCharToMultiByte(CP_ACP, 0, pwszSrc, -1, NULL, 0, NULL, NULL);
if (nLen<= 0) return std::string("");
char* pszDst = new char[nLen];

if (NULL == pszDst) return std::string("");
WideCharToMultiByte(CP_ACP, 0, pwszSrc, -1, pszDst, nLen, NULL, NULL);

pszDst[nLen -1] = 0;
std::string strTemp(pszDst);

delete [] pszDst;
return strTemp;

}
string ws2s(wstring& inputws){ return WChar2Ansi(inputws.c_str()); }
//Converting a Ansi string to WChar string
std::wstring Ansi2WChar(LPCSTR pszSrc, int nLen)
{

int nSize = MultiByteToWideChar(CP_ACP, 0, (LPCSTR)pszSrc, nLen, 0, 0);

if(nSize <= 0) return NULL;
WCHAR *pwszDst = new WCHAR[nSize+1];

if( NULL == pwszDst) return NULL;
MultiByteToWideChar(CP_ACP, 0,(LPCSTR)pszSrc, nLen, pwszDst, nSize);

pwszDst[nSize] = 0;
if( pwszDst[0] == 0xFEFF) // skip Oxfeff

for(int i = 0; i < nSize; i ++)

pwszDst[i] = pwszDst[i+1];
wstring wcharString(pwszDst);

delete pwszDst;
return wcharString;

}
std::wstring s2ws(const string& s){ return Ansi2WChar(s.c_str(),s.size());}
第二种方法：采用ATL封装_bstr_t的过渡：（注，_bstr_是Microsoft Specific的，所以下面代码可以在VS2005通过，无移植性）；

#include <string>

#include <comutil.h>

using namespace std;

#pragma comment(lib, "comsuppw.lib")
string ws2s(const wstring& ws);

wstring s2ws(const string& s);
string ws2s(const wstring& ws)

{

_bstr_t t = ws.c_str();

char* pchar = (char*)t;

string result = pchar;

return result;

}
wstring s2ws(const string& s)

{

_bstr_t t = s.c_str();

wchar_t* pwchar = (wchar_t*)t;

wstring result = pwchar;

return result;

}
第三种方法：使用CRT库的mbstowcs()函数和wcstombs()函数，平台无关，需设定locale。

#include <string>

#include <locale.h>

using namespace std;

string ws2s(const wstring& ws)

{

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);

string result = _Dest;

delete []_Dest;
setlocale(LC_ALL, curLocale.c_str());
return result;

}
wstring s2ws(const 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);

wstring result = _Dest;

delete []_Dest;
setlocale(LC_ALL, "C");
return result;

}