多字节与UTF-8、Unicode之间的转换

// 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;
}
// 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;
}
// 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;
}
//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;
}
// 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;
}
// 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;
}
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