MSDN找到的：在各种字符串类型之间进行转换

CRoot

在各种字符串类型之间进行转换
1、从 char * 转换

1. // convert_from_char.cpp
   
2. // compile with: /clr /link comsuppw.lib
   
3. 
   
4. #include <iostream>
   
5. #include <stdlib.h>
   
6. #include <string>
   
7. 
   
8. #include "atlbase.h"
   
9. #include "atlstr.h"
   
10. #include "comutil.h"
    
11. 
    
12. using namespace std;
    
13. using namespace System;
    
14. 
    
15. int main()
    
16. {
    
17.     char *orig = "Hello, World!";
    
18.     cout << orig << " (char *)" << endl;
    
19. 
    
20.     // Convert to a wchar_t*
    
21.     size_t origsize = strlen(orig) + 1;
    
22.     const size_t newsize = 100;
    
23.     size_t convertedChars = 0;
    
24.     wchar_t wcstring[newsize];
    
25.     mbstowcs_s(&convertedChars, wcstring, origsize, orig, _TRUNCATE);
    
26.     wcscat_s(wcstring, L" (wchar_t *)");
    
27.     wcout << wcstring << endl;
    
28. 
    
29.     // Convert to a _bstr_t
    
30.     _bstr_t bstrt(orig);
    
31.     bstrt += " (_bstr_t)";
    
32.     cout << bstrt << endl;
    
33. 
    
34.     // Convert to a CComBSTR
    
35.     CComBSTR ccombstr(orig);
    
36.     if (ccombstr.Append(L" (CComBSTR)") == S_OK)
    
37.     {
    
38.         CW2A printstr(ccombstr);
    
39.         cout << printstr << endl;
    
40.     }
    
41. 
    
42.     // Convert to a CString
    
43.     CString cstring(orig);
    
44.     cstring += " (CString)";
    
45.     cout << cstring << endl;
    
46. 
    
47.     // Convert to a basic_string
    
48.     string basicstring(orig);
    
49.     basicstring += " (basic_string)";
    
50.     cout << basicstring << endl;
    
51. 
    
52.     // Convert to a System::String
    
53.     String ^systemstring = gcnew String(orig);
    
54.     systemstring += " (System::String)";
    
55.     Console::WriteLine("{0}", systemstring);
    
56.     delete systemstring;
    
57. }
    

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输出 Hello, World! (char *)Hello, World! (wchar_t *)Hello, World! (_bstr_t)Hello, World! (CComBSTR)Hello, World! (CString)Hello, World! (basic_string)Hello, World! (System::String)2、从 wchar_t * 转换

1. // convert_from_wchar_t.cpp
   
2. // compile with: /clr /link comsuppw.lib
   
3. 
   
4. #include <iostream>
   
5. #include <stdlib.h>
   
6. #include <string>
   
7. 
   
8. #include "atlbase.h"
   
9. #include "atlstr.h"
   
10. #include "comutil.h"
    
11. 
    
12. using namespace std;
    
13. using namespace System;
    
14. 
    
15. int main()
    
16. {
    
17.     wchar_t *orig = L"Hello, World!";
    
18.     wcout << orig << L" (wchar_t *)" << endl;
    
19. 
    
20.     // Convert to a char*
    
21.     size_t origsize = wcslen(orig) + 1;
    
22.     const size_t newsize = 100;
    
23.     size_t convertedChars = 0;
    
24.     char nstring[newsize];
    
25.     wcstombs_s(&convertedChars, nstring, origsize, orig, _TRUNCATE);
    
26.     strcat_s(nstring, " (char *)");
    
27.     cout << nstring << endl;
    
28. 
    
29.     // Convert to a _bstr_t
    
30.     _bstr_t bstrt(orig);
    
31.     bstrt += " (_bstr_t)";
    
32.     cout << bstrt << endl;
    
33. 
    
34.     // Convert to a CComBSTR
    
35.     CComBSTR ccombstr(orig);
    
36.     if (ccombstr.Append(L" (CComBSTR)") == S_OK)
    
37.     {
    
38.         CW2A printstr(ccombstr);
    
39.         cout << printstr << endl;
    
40.     }
    
41. 
    
42.     // Convert to a CString
    
43.     CString cstring(orig);
    
44.     cstring += " (CString)";
    
45.     cout << cstring << endl;
    
46. 
    
47.     // Convert to a basic_string
    
48.     wstring basicstring(orig);
    
49.     basicstring += L" (basic_string)";
    
50.     wcout << basicstring << endl;
    
51. 
    
52.     // Convert to a System::String
    
53.     String ^systemstring = gcnew String(orig);
    
54.     systemstring += " (System::String)";
    
55.     Console::WriteLine("{0}", systemstring);
    
56.     delete systemstring;
    
57. }

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楼下续接

CRoot

输出 Hello, World! (wchar_t *)Hello, World! (char *)Hello, World! (_bstr_t)Hello, World! (CComBSTR)Hello, World! (CString)Hello, World! (basic_string)Hello, World! (System::String)

---

3、从 _bstr_t 转换

1. // convert_from_bstr_t.cpp
   
2. // compile with: /clr /link comsuppw.lib
   
3. 
   
4. #include <iostream>
   
5. #include <stdlib.h>
   
6. #include <string>
   
7. 
   
8. #include "atlbase.h"
   
9. #include "atlstr.h"
   
10. #include "comutil.h"
    
11. 
    
12. using namespace std;
    
13. using namespace System;
    
14. 
    
15. int main()
    
16. {
    
17.     _bstr_t orig("Hello, World!");
    
18.     wcout << orig << " (_bstr_t)" << endl;
    
19. 
    
20.     // Convert to a char*
    
21.     const size_t newsize = 100;
    
22.     char nstring[newsize];
    
23.     strcpy_s(nstring, (char *)orig);
    
24.     strcat_s(nstring, " (char *)");
    
25.     cout << nstring << endl;
    
26. 
    
27.     // Convert to a wchar_t*
    
28.     wchar_t wcstring[newsize];
    
29.     wcscpy_s(wcstring, (wchar_t *)orig);
    
30.     wcscat_s(wcstring, L" (wchar_t *)");
    
31.     wcout << wcstring << endl;
    
32. 
    
33.     // Convert to a CComBSTR
    
34.     CComBSTR ccombstr((char *)orig);
    
35.     if (ccombstr.Append(L" (CComBSTR)") == S_OK)
    
36.     {
    
37.         CW2A printstr(ccombstr);
    
38.         cout << printstr << endl;
    
39.     }
    
40. 
    
41.     // Convert to a CString
    
42.     CString cstring((char *)orig);
    
43.     cstring += " (CString)";
    
44.     cout << cstring << endl;
    
45. 
    
46.     // Convert to a basic_string
    
47.     string basicstring((char *)orig);
    
48.     basicstring += " (basic_string)";
    
49.     cout << basicstring << endl;
    
50. 
    
51.     // Convert to a System::String
    
52.     String ^systemstring = gcnew String((char *)orig);
    
53.     systemstring += " (System::String)";
    
54.     Console::WriteLine("{0}", systemstring);
    
55.     delete systemstring;
    
56. }
    

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输出 Hello, World! (_bstr_t)Hello, World! (char *)Hello, World! (wchar_t *)Hello, World! (CComBSTR)Hello, World! (CString)Hello, World! (basic_string)Hello, World! (System::String

---

4、从 CComBSTR 转换

1. // convert_from_ccombstr.cpp
   
2. // compile with: /clr /link comsuppw.lib
   
3. 
   
4. #include <iostream>
   
5. #include <stdlib.h>
   
6. #include <string>
   
7. 
   
8. #include "atlbase.h"
   
9. #include "atlstr.h"
   
10. #include "comutil.h"
    
11. #include "vcclr.h"
    
12. 
    
13. using namespace std;
    
14. using namespace System;
    
15. using namespace System::Runtime::InteropServices;
    
16. 
    
17. int main()
    
18. {
    
19.     CComBSTR orig("Hello, World!");
    
20.     CW2A printstr(orig);
    
21.     cout << printstr << " (CComBSTR)" << endl;
    
22. 
    
23.     // Convert to a char*
    
24.     const size_t newsize = 100;
    
25.     char nstring[newsize];
    
26.     CW2A tmpstr1(orig);
    
27.     strcpy_s(nstring, tmpstr1);
    
28.     strcat_s(nstring, " (char *)");
    
29.     cout << nstring << endl;
    
30. 
    
31.     // Convert to a wchar_t*
    
32.     wchar_t wcstring[newsize];
    
33.     wcscpy_s(wcstring, orig);
    
34.     wcscat_s(wcstring, L" (wchar_t *)");
    
35.     wcout << wcstring << endl;
    
36. 
    
37.     // Convert to a _bstr_t
    
38.     _bstr_t bstrt(orig);
    
39.     bstrt += " (_bstr_t)";
    
40.     cout << bstrt << endl;
    
41. 
    
42.     // Convert to a CString
    
43.     CString cstring(orig);
    
44.     cstring += " (CString)";
    
45.     cout << cstring << endl;
    
46. 
    
47.     // Convert to a basic_string
    
48.     wstring basicstring(orig);
    
49.     basicstring += L" (basic_string)";
    
50.     wcout << basicstring << endl;
    
51. 
    
52.     // Convert to a System::String
    
53.     String ^systemstring = gcnew String(orig);
    
54.     systemstring += " (System::String)";
    
55.     Console::WriteLine("{0}", systemstring);
    
56.     delete systemstring;
    
57. }
    

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输出 Hello, World! (CComBSTR)Hello, World! (char *)Hello, World! (wchar_t *)Hello, World! (_bstr_t)Hello, World! (CString)Hello, World! (basic_string)Hello, World! (System::String)





补充内容 (2012-10-4 12:32):
楼下继续、、、、未结束，勿回帖

CRoot

---

5、从 CString 转换

1. // convert_from_cstring.cpp
   
2. // compile with: /clr /link comsuppw.lib
   
3. 
   
4. #include <iostream>
   
5. #include <stdlib.h>
   
6. #include <string>
   
7. 
   
8. #include "atlbase.h"
   
9. #include "atlstr.h"
   
10. #include "comutil.h"
    
11. 
    
12. using namespace std;
    
13. using namespace System;
    
14. 
    
15. int main()
    
16. {
    
17.     CString orig("Hello, World!");
    
18.     wcout << orig << " (CString)" << endl;
    
19. 
    
20.     // Convert to a char*
    
21.     const size_t newsize = 100;
    
22.     char nstring[newsize];
    
23.     strcpy_s(nstring, orig);
    
24.     strcat_s(nstring, " (char *)");
    
25.     cout << nstring << endl;
    
26. 
    
27.     // Convert to a wchar_t*
    
28.     // You must first convert to a char * for this to work.
    
29.     size_t origsize = strlen(orig) + 1;
    
30.     size_t convertedChars = 0;
    
31.     wchar_t wcstring[newsize];
    
32.     mbstowcs_s(&convertedChars, wcstring, origsize, orig, _TRUNCATE);
    
33.     wcscat_s(wcstring, L" (wchar_t *)");
    
34.     wcout << wcstring << endl;
    
35. 
    
36.     // Convert to a _bstr_t
    
37.     _bstr_t bstrt(orig);
    
38.     bstrt += " (_bstr_t)";
    
39.     cout << bstrt << endl;
    
40. 
    
41.     // Convert to a CComBSTR
    
42.     CComBSTR ccombstr(orig);
    
43.     if (ccombstr.Append(L" (CComBSTR)") == S_OK)
    
44.     {
    
45.         CW2A printstr(ccombstr);
    
46.         cout << printstr << endl;
    
47.     }
    
48. 
    
49.     // Convert to a basic_string
    
50.     string basicstring(orig);
    
51.     basicstring += " (basic_string)";
    
52.     cout << basicstring << endl;
    
53. 
    
54.     // Convert to a System::String
    
55.     String ^systemstring = gcnew String(orig);
    
56.     systemstring += " (System::String)";
    
57.     Console::WriteLine("{0}", systemstring);
    
58.     delete systemstring;
    
59. }

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输出 Hello, World! (CString)Hello, World! (char *)Hello, World! (wchar_t *)Hello, World! (_bstr_t)Hello, World! (CComBSTR)Hello, World! (basic_string)Hello, World! (System::String)

---

6、从 basic_string 转换

1. // convert_from_basic_string.cpp
   
2. // compile with: /clr /link comsuppw.lib
   
3. 
   
4. #include <iostream>
   
5. #include <stdlib.h>
   
6. #include <string>
   
7. 
   
8. #include "atlbase.h"
   
9. #include "atlstr.h"
   
10. #include "comutil.h"
    
11. 
    
12. using namespace std;
    
13. using namespace System;
    
14. 
    
15. int main()
    
16. {
    
17.     string orig("Hello, World!");
    
18.     cout << orig << " (basic_string)" << endl;
    
19. 
    
20.     // Convert to a char*
    
21.     const size_t newsize = 100;
    
22.     char nstring[newsize];
    
23.     strcpy_s(nstring, orig.c_str());
    
24.     strcat_s(nstring, " (char *)");
    
25.     cout << nstring << endl;
    
26. 
    
27.     // Convert to a wchar_t*
    
28.     // You must first convert to a char * for this to work.
    
29.     size_t origsize = strlen(orig.c_str()) + 1;
    
30.     size_t convertedChars = 0;
    
31.     wchar_t wcstring[newsize];
    
32.     mbstowcs_s(&convertedChars, wcstring, origsize, orig.c_str(), _TRUNCATE);
    
33.     wcscat_s(wcstring, L" (wchar_t *)");
    
34.     wcout << wcstring << endl;
    
35. 
    
36.     // Convert to a _bstr_t
    
37.     _bstr_t bstrt(orig.c_str());
    
38.     bstrt += " (_bstr_t)";
    
39.     cout << bstrt << endl;
    
40. 
    
41.     // Convert to a CComBSTR
    
42.     CComBSTR ccombstr(orig.c_str());
    
43.     if (ccombstr.Append(L" (CComBSTR)") == S_OK)
    
44.     {
    
45.         CW2A printstr(ccombstr);
    
46.         cout << printstr << endl;
    
47.     }
    
48. 
    
49.     // Convert to a CString
    
50.     CString cstring(orig.c_str());
    
51.     cstring += " (CString)";
    
52.     cout << cstring << endl;
    
53. 
    
54.     // Convert to a System::String
    
55.     String ^systemstring = gcnew String(orig.c_str());
    
56.     systemstring += " (System::String)";
    
57.     Console::WriteLine("{0}", systemstring);
    
58.     delete systemstring;
    
59. }
    

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输出 Hello, World! (basic_string)Hello, World! (char *)Hello, World! (wchar_t *)Hello, World! (_bstr_t)Hello, World! (CComBSTR)Hello, World! (CString)Hello, World! (System::String)

---

7、从 System::String 转换

1. // convert_from_system_string.cpp
   
2. // compile with: /clr /link comsuppw.lib
   
3. 
   
4. #include <iostream>
   
5. #include <stdlib.h>
   
6. #include <string>
   
7. 
   
8. #include "atlbase.h"
   
9. #include "atlstr.h"
   
10. #include "comutil.h"
    
11. #include "vcclr.h"
    
12. 
    
13. using namespace std;
    
14. using namespace System;
    
15. using namespace System::Runtime::InteropServices;
    
16. 
    
17. int main()
    
18. {
    
19.     String ^orig = gcnew String("Hello, World!");
    
20.     Console::WriteLine("{0} (System::String)", orig);
    
21. 
    
22.     pin_ptr<const wchar_t> wch = PtrToStringChars(orig);
    
23. 
    
24.     // Convert to a char*
    
25.     size_t origsize = wcslen(wch) + 1;
    
26.     const size_t newsize = 100;
    
27.     size_t convertedChars = 0;
    
28.     char nstring[newsize];
    
29.     wcstombs_s(&convertedChars, nstring, origsize, wch, _TRUNCATE);
    
30.     strcat_s(nstring, " (char *)");
    
31.     cout << nstring << endl;
    
32. 
    
33.     // Convert to a wchar_t*
    
34.     wchar_t wcstring[newsize];
    
35.     wcscpy_s(wcstring, wch);
    
36.     wcscat_s(wcstring, L" (wchar_t *)");
    
37.     wcout << wcstring << endl;
    
38. 
    
39.     // Convert to a _bstr_t
    
40.     _bstr_t bstrt(wch);
    
41.     bstrt += " (_bstr_t)";
    
42.     cout << bstrt << endl;
    
43. 
    
44.     // Convert to a CComBSTR
    
45.     CComBSTR ccombstr(wch);
    
46.     if (ccombstr.Append(L" (CComBSTR)") == S_OK)
    
47.     {
    
48.         CW2A printstr(ccombstr);
    
49.         cout << printstr << endl;
    
50.     }
    
51. 
    
52.     // Convert to a CString
    
53.     CString cstring(wch);
    
54.     cstring += " (CString)";
    
55.     cout << cstring << endl;
    
56. 
    
57.     // Convert to a basic_string
    
58.     wstring basicstring(wch);
    
59.     basicstring += L" (basic_string)";
    
60.     wcout << basicstring << endl;
    
61. 
    
62.     delete orig;
    
63. }

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输出 Hello, World! (System::String)Hello, World! (char *)Hello, World! (wchar_t *)Hello, World! (_bstr_t)Hello, World! (CComBSTR)Hello, World! (CString)Hello, World! (basic_string)完结！！OK了！

Cocol

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