C++中char*\wchar_t*\string\wstring之間的相互轉換

C++中char*\wchar_t*\string\wstring之間的相互轉換：

1. #ifndef USE_H_
2. #define USE_H_
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. }

如果涉及到CString，可以利用CString::GetBuffer()函數來進行轉換，道理一樣.