深入理解c++中char*與wchar_t*與string以及wstring之間的相互轉換

複製代碼 代碼如下: #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;

複製代碼 代碼如下: #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()函數來進行轉換，道理一樣.