本帖最后由 51hei不 于 2016-6-19 16:57 編輯
第一種方法：調(diào)用WideCharToMultiByte()和MultiByteToWideChar()，代碼如下（關于詳細的解釋，可以參考《windows核心編程》）：
- #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());}
第二種方法：采用ATL封裝_bstr_t的過渡：（注，_bstr_是Microsoft Specific的，所以下面代碼可以在VS2005通過，無移植性）；
- #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;
- }
第三種方法：使用CRT庫的mbstowcs()函數(shù)和wcstombs()函數(shù)，平臺無關，需設定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;
- }
- std::wstring s2ws(const std::string& s)
- {
- std::string curLocale = setlocale(LC_ALL, NULL); // curLocale = "C";
- 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, curLocale.c_str());
- return result;
- }
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