str::string和wchar_t*相互转化

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虽然已经默默的在不断告诉自己，非万不得已不要使用c++，但还是会有一些时候需要，尤其是这种接口函数。

#include <windows.h>#include <locale.h>// wchar_t to stringvoid Wchar_tToString(std::string& szDst, wchar_t *wchar){wchar_t * wText = wchar;DWORD dwNum = WideCharToMultiByte(CP_OEMCP,NULL,wText,-1,NULL,0,NULL,FALSE);// WideCharToMultiByteµƒ‘À”√char *psText; // psTextŒ™char*µƒ¡Ÿ ± ˝◊È£¨◊˜Œ™∏≥÷µ∏¯std::stringµƒ÷–º‰±‰¡øpsText = new char[dwNum];WideCharToMultiByte (CP_OEMCP,NULL,wText,-1,psText,dwNum,NULL,FALSE);// WideCharToMultiByteµƒ‘Ÿ¥Œ‘À”√szDst = psText;// std::string∏≥÷µdelete []psText;// psTextµƒ«Â≥˝}//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;  } std::string ws2s(std::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];   std::wstring wcharString(pwszDst);  delete pwszDst;  return wcharString;  }  std::wstring s2ws(const std::string& s){ return Ansi2WChar(s.c_str(),s.size());}

用法：

//const wchar_t * to std::stringconst wchar_t* _file;std::string fileName;Wchar_tToString(fileName, const_cast<wchar_t*>(_file));//std::string to std::wstringstd::wstring str = s2ws(fileName);

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