多字节与UTF-8、Unicode之间的转换（二）

1、多字节编码转为UTF8编码  
2、UTF8编码转为多字节编码  
3、多字节编码转为Unicode编码  
4、Unicode编码转为多字节编码 
5、UTF8编码转为Unicode  
6、Unicode编码转为UTF8

---

1、多字节编码转为UTF8编码

bool MBToUTF8(vector<char>& pu8, const char* pmb, int32 mLen)  
{  
     // convert an MBCS string to widechar   
     int32 nLen = MultiByteToWideChar(CP_ACP, 0, pmb, mLen, NULL, 0);  

     WCHAR* lpszW = NULL;  
     try  
     {  
        lpszW = new WCHAR[nLen];  
     }  
     catch(bad_alloc &memExp)  
     {  
        return false;  
     }  

     int32 nRtn = MultiByteToWideChar(CP_ACP, 0, pmb, mLen, lpszW, nLen);  

     if(nRtn != nLen)  
     {  
        delete[] lpszW;  
        return false;  
     }  
     // convert an widechar string to utf8  
     int32 utf8Len = WideCharToMultiByte(CP_UTF8, 0, lpszW, nLen, NULL, 0, NULL, NULL);  
     if (utf8Len <= 0)  
     {  
         return false;  
     }  
     pu8.resize(utf8Len);  
     nRtn = WideCharToMultiByte(CP_UTF8, 0, lpszW, nLen, &*pu8.begin(), utf8Len, NULL, NULL);  
     delete[] lpszW;  

     if (nRtn != utf8Len)  
     {  
         pu8.clear();  
         return false;  
     }  
     return true;  
 }

2 、UTF8编码转为多字节编码

bool UTF8ToMB(vector<char>& pmb, const char* pu8, int32 utf8Len)  
{  
    // convert an UTF8 string to widechar   
    int32 nLen = MultiByteToWideChar(CP_UTF8, 0, pu8, utf8Len, NULL, 0);  

    WCHAR* lpszW = NULL;  
    try  
    {  
        lpszW = new WCHAR[nLen];  
    }  
    catch(bad_alloc &memExp)  
    {  
        return false;  
    }  

    int32 nRtn = MultiByteToWideChar(CP_UTF8, 0, pu8, utf8Len, lpszW, nLen);  

    if(nRtn != nLen)  
    {  
        delete[] lpszW;  
        return false;  
    }  

    // convert an widechar string to Multibyte   
    int32 MBLen = WideCharToMultiByte(CP_ACP, 0, lpszW, nLen, NULL, 0, NULL, NULL);  
    if (MBLen <=0)  
    {  
        return false;  
    }  
    pmb.resize(MBLen);  
    nRtn = WideCharToMultiByte(CP_ACP, 0, lpszW, nLen, &*pmb.begin(), MBLen, NULL, NULL);  
    delete[] lpszW;  

    if(nRtn != MBLen)  
    {  
        pmb.clear();  
        return false;  
    }  
    return true;  
}  

3、多字节编码转为Unicode编码

bool MBToUnicode(vector<wchar_t>& pun, const char* pmb, int32 mLen)  
{  
    // convert an MBCS string to widechar   
    int32 uLen = MultiByteToWideChar(CP_ACP, 0, pmb, mLen, NULL, 0);  

    if (uLen<=0)  
    {  
        return false;  
    }  
    pun.resize(uLen);  

    int32 nRtn = MultiByteToWideChar(CP_ACP, 0, pmb, mLen, &*pun.begin(), uLen);  

    if (nRtn != uLen)  
    {  
        pun.clear();  
        return false;  
    }  
    return true;  
}  

4、Unicode编码转为多字节编码

bool UnicodeToMB(vector<char>& pmb, const wchar_t* pun, int32 uLen)  
{  
    // convert an widechar string to Multibyte   
    int32 MBLen = WideCharToMultiByte(CP_ACP, 0, pun, uLen, NULL, 0, NULL, NULL);  
    if (MBLen <=0)  
    {  
        return false;  
    }  
    pmb.resize(MBLen);  
    int nRtn = WideCharToMultiByte(CP_ACP, 0, pun, uLen, &*pmb.begin(), MBLen, NULL, NULL);  

    if(nRtn != MBLen)  
    {  
        pmb.clear();  
        return false;  
    }  
    return true;  
}  

5、 UTF8编码转为Unicode

bool UTF8ToUnicode(vector<wchar_t>& pun, const char* pu8, int32 utf8Len)  
{  
    // convert an UTF8 string to widechar   
    int32 nLen = MultiByteToWideChar(CP_UTF8, 0, pu8, utf8Len, NULL, 0);  
    if (nLen <=0)  
    {  
        return false;  
    }  
    pun.resize(nLen);  
    int32 nRtn = MultiByteToWideChar(CP_UTF8, 0, pu8, utf8Len, &*pun.begin(), nLen);  

    if(nRtn != nLen)  
    {  
        pun.clear();  
        return false;  
    }  

    return true;  
}  

6、 Unicode编码转为UTF8

bool UnicodeToUTF8(vector<char>& pu8, const wchar_t* pun, int32 uLen)  
{  
    // convert an widechar string to utf8  
    int32 utf8Len = WideCharToMultiByte(CP_UTF8, 0, pun, uLen, NULL, 0, NULL, NULL);  
    if (utf8Len<=0)  
    {  
        return false;  
    }  
    pu8.resize(utf8Len);  
    int32 nRtn = WideCharToMultiByte(CP_UTF8, 0, pun, uLen, &*pu8.begin(), utf8Len, NULL, NULL);  

    if (nRtn != utf8Len)  
    {  
        pu8.clear();  
        return false;  
    }  
    return true;  
}