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

 1   #ifndef USE_H_  
 2     #define USE_H_  
 3 
 4     #include <iostream>  
 5     #include <windows.h>  
 6     #include <string>  
 7     using namespace std;  
 8     class CUser  
 9     {  
10     public:  
11         CUser();  
12         virtual~ CUser();  
13         char* WcharToChar(const wchar_t* wp);  
14         char* StringToChar(const string& s);  
15         char* WstringToChar(const wstring& ws);  
16         wchar_t* CharToWchar(const char* c);  
17         wchar_t* WstringToWchar(const wstring& ws);  
18         wchar_t* StringToWchar(const string& s);  
19         wstring StringToWstring(const string& s);  
20         string WstringToString(const wstring& ws);  
21         void Release();  
22     private:  
23         char* m_char;  
24         wchar_t* m_wchar;  
25     };  
26     #endif; 

 1     #include "stdafx.h"  
 2     #include "use.h"  
 3     CUser::CUser()  
 4     :m_char(NULL)  
 5     ,m_wchar(NULL)  
 6     {  
 7     }  
 8     CUser::~CUser()  
 9     {  
10         Release();  
11     }  
12     char* CUser::WcharToChar(const wchar_t* wp)  
13     {  
14         Release();  
15         int len= WideCharToMultiByte(CP_ACP,0,wp,wcslen(wp),NULL,0,NULL,NULL);  
16         m_char=new char[len+1];  
17         WideCharToMultiByte(CP_ACP,0,wp,wcslen(wp),m_char,len,NULL,NULL); 
18         m_char[len]=‘\0‘;  
19         return m_char;  
20     }  
21     wchar_t* CUser::CharToWchar(const char* c)  
22     {  
23         Release();  
24         int len = MultiByteToWideChar(CP_ACP,0,c,strlen(c),NULL,0);  
25         m_wchar=new wchar_t[len+1];  
26         MultiByteToWideChar(CP_ACP,0,c,strlen(c),m_wchar,len);  
27         m_wchar[len]=‘\0‘;  
28         return m_wchar;  
29     }  
30     void CUser::Release()  
31     {  
32         if(m_char)  
33         {  
34             delete m_char;  
35             m_char=NULL;  
36         }  
37         if(m_wchar)  
38         {  
39             delete m_wchar;  
40             m_wchar=NULL;  
41         }  
42     }  
43     char* CUser::StringToChar(const string& s)  
44     {  
45         return const_cast<char*>(s.c_str());  
46     }  
47     char* CUser::WstringToChar(const std::wstring &ws)  
48     {  
49         const wchar_t* wp=ws.c_str();  
50         return WcharToChar(wp);  
51     }  
52     wchar_t* CUser::WstringToWchar(const std::wstring &ws)  
53     {  
54         return const_cast<wchar_t*>(ws.c_str());  
55     }  
56     wchar_t* CUser::StringToWchar(const string& s)  
57     {  
58         const char* p=s.c_str();  
59         return CharToWchar(p);  
60     }  
61     string CUser::WstringToString(const std::wstring &ws)  
62     {  
63         string s;  
64         char* p=WstringToChar(ws);  
65         s.append(p);  
66         return s;  
67     }  
68     wstring CUser::StringToWstring(const std::string &s)  
69     {  
70         wstring ws;  
71         wchar_t* wp=StringToWchar(s);  
72         ws.append(wp);  
73         return ws;  
74     }