c++中char*\wchar_t*\string\wstring之间的相互转换 .

#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,0,wp,wcslen(wp),NULL,0,NULL,NULL); m_char=new char[len+1]; WideCharToMultiByte(CP_ACP,0,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,0,c,strlen(c),NULL,0); m_wchar=new wchar_t[len+1]; MultiByteToWideChar(CP_ACP,0,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;}