C++ get host domain name in URL

std::string SplitHostDomain(const std::string& str) 
{
    if (!!str.compare(0,5,"http:"))
 
    { 
        size_t found = str.find_first_of("/\\");
        std::string str1 = str.substr(found + 2);
        found = str1.find_first_of("/\\");
        found = str1.find_first_of(":");
        return (str1.substr(0, found));
    }
    else{
        size_t found = str.find_first_of("/\\");
               found = str.find_first_of(":");
        return (str.substr(0, found));
    }
}

	
printf("%s\n", splitFileName("http://www.baidu.com/test/1").c_str());
printf("%s\n", splitFileName("www.baidu.com/test/1").c_str());