C++ 字符串编码方式转换

01.// 多字节编码转为UTF8编码   
02.bool MBToUTF8(vector<char>& pu8, const char* pmb, int32 mLen)  
03.{  
04. // convert an MBCS string to widechar    
05. int32 nLen = MultiByteToWideChar(CP_ACP, 0, pmb, mLen, NULL, 0);  
06.   
07. WCHAR* lpszW = NULL;  
08. try  
09. {  
10.    lpszW = new WCHAR[nLen];  
11. }  
12. catch(bad_alloc &memExp)  
13. {  
14.    return false;  
15. }  
16.  
17. int32 nRtn = MultiByteToWideChar(CP_ACP, 0, pmb, mLen, lpszW, nLen);  
18.   
19. if(nRtn != nLen)  
20. {  
21.    delete[] lpszW;  
22.    return false;  
23. }  
24. // convert an widechar string to utf8   
25. int32 utf8Len = WideCharToMultiByte(CP_UTF8, 0, lpszW, nLen, NULL, 0, NULL, NULL);  
26. if (utf8Len <= 0)  
27. {  
28.     return false;  
29. }  
30. pu8.resize(utf8Len);  

31. nRtn = WideCharToMultiByte(CP_UTF8, 0, lpszW, nLen, &*pu8.begin(), utf8Len, NULL, NULL);  
32. delete[] lpszW;  
33.  
34. if (nRtn != utf8Len)  
35. {  
36.     pu8.clear();  
37.     return false;  
38. }  
39. return true;  
40.}  
41.  
42.// UTF8编码转为多字节编码   
43.bool UTF8ToMB(vector<char>& pmb, const char* pu8, int32 utf8Len)  
44.{  
45.    // convert an UTF8 string to widechar    
46.    int32 nLen = MultiByteToWideChar(CP_UTF8, 0, pu8, utf8Len, NULL, 0);  
47.  
48.    WCHAR* lpszW = NULL;  
49.    try  
50.    {  
51.        lpszW = new WCHAR[nLen];  
52.    }  
53.    catch(bad_alloc &memExp)  
54.    {  
55.        return false;  
56.    }  
57.  
58.    int32 nRtn = MultiByteToWideChar(CP_UTF8, 0, pu8, utf8Len, lpszW, nLen);  
59.  
60.    if(nRtn != nLen)