深入理解c++中char*与wchar_t*与string以及wstring之间的相互转换 [转]

本篇文章是对c++中的char*与wchar_t*与string以及wstring之间的相互转换进行了详细的分析介绍，需要的朋友参考下。

   #ifndef USE_H_
     #define USE_H_  

     #include <iostream>
     #include <windows.h>
     #include <string>
     using namespace std;
     class CUser
     {
     public:
         CUser();
         virtual~ CUser();
         char* WcharToChar(const wchar_t* wp);
         char* StringToChar(const string& s);
         char* WstringToChar(const wstring& ws);
         wchar_t* CharToWchar(const char* c);
         wchar_t* WstringToWchar(const wstring& ws);
         wchar_t* StringToWchar(const string& s);
         wstring StringToWstring(const string& s);
         string WstringToString(const wstring& ws);
         void Release();
     private:
         char* m_char;
         wchar_t* m_wchar;
     };
     #endif; 

     #include "stdafx.h"
     #include "use.h"
     CUser::CUser()
     :m_char(NULL)
     ,m_wchar(NULL)
     {
     }
     CUser::~CUser()
     {
         Release();
     }
     char* CUser::WcharToChar(const wchar_t* wp)
     {
         Release();
         int len= WideCharToMultiByte(CP_ACP,,wp,wcslen(wp),NULL,,NULL,NULL);
         m_char=new char[len+];
         WideCharToMultiByte(CP_ACP,,wp,wcslen(wp),m_char,len,NULL,NULL);
         m_char[len]='\0';
         return m_char;
     }
     wchar_t* CUser::CharToWchar(const char* c)
     {
         Release();
         int len = MultiByteToWideChar(CP_ACP,,c,strlen(c),NULL,);
         m_wchar=new wchar_t[len+];
         MultiByteToWideChar(CP_ACP,,c,strlen(c),m_wchar,len);
         m_wchar[len]='\0';
         return m_wchar;
     }
     void CUser::Release()
     {
         if(m_char)
         {
             delete m_char;
             m_char=NULL;
         }
         if(m_wchar)
         {
             delete m_wchar;
             m_wchar=NULL;
         }
     }
     char* CUser::StringToChar(const string& s)
     {
         return const_cast<char*>(s.c_str());
     }
     char* CUser::WstringToChar(const std::wstring &ws)
     {
         const wchar_t* wp=ws.c_str();
         return WcharToChar(wp);
     }
     wchar_t* CUser::WstringToWchar(const std::wstring &ws)
     {
         return const_cast<wchar_t*>(ws.c_str());
     }
     wchar_t* CUser::StringToWchar(const string& s)
     {
         const char* p=s.c_str();
         return CharToWchar(p);
     }
     string CUser::WstringToString(const std::wstring &ws)
     {
         string s;
         char* p=WstringToChar(ws);
         s.append(p);
         return s;
     }
     wstring CUser::StringToWstring(const std::string &s)
     {
         wstring ws;
         wchar_t* wp=StringToWchar(s);
         ws.append(wp);
         return ws;
     }  

如果涉及到CString，可以利用CString::GetBuffer()函数来进行转换，道理一样.

转自：http://www.jb51.net/article/37627.htm