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

 

在近期工作中调用厂家提供的sdk，其库、demo是用vs2008完成的，对接口的调用在参数上有些出入，需要转换

把在论坛中找到结果记录如下：

 

[cpp]

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;  

#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;

[cpp]

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. }  

#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.

转自

灰常感谢