ASCII码转化成UTF8

int AsciToUtf8(char* pSrc, unsigned int nSrcLen, char* pBuffer, unsigned int nBufferLen)
{
    assert(pSrc != NULL);
 
    int nRet(0);
    int nUtf16Len = MultiByteToWideChar(CP_ACP, 0, pSrc, nSrcLen, NULL, 0);
    if(nUtf16Len > 0)
    {
        wchar_t* pW = new wchar_t[nUtf16Len];
        if(pW != NULL)
        {
            nUtf16Len = MultiByteToWideChar(CP_ACP, 0, pSrc, nSrcLen, pW, nUtf16Len);
             
            if(pBuffer == NULL || nBufferLen <= 0)
            {
                nRet = WideCharToMultiByte(CP_UTF8, 0, pW, nUtf16Len, NULL, 0, NULL, NULL);
            }
            else
            {
                nRet = WideCharToMultiByte(CP_UTF8, 0, pW, nUtf16Len, pBuffer, nBufferLen, NULL, NULL);
            }
 
            delete []pW;
            pW = NULL;
        }
    }
 
    return nRet;
}
 
int main()
{
     
    char* p = "abc,你好";
    int nLen = lstrlen(p) + 1; //include end flag '\0'
 
    int nBufferLen = AsciToUtf8(p, nLen, NULL, 0); //get need buffer length
 
    char* pBuffer = new char[nBufferLen];
    AsciToUtf8(p, nLen, pBuffer, nBufferLen);
    delete []pBuffer;
 
    system("pause");
 
    return 0;
}