C++中char*\wchar_t*\string\wstring之间的相互转换：

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