fn main(){
    let searcher = ip2region::Searcher::new("./data/ip2region.xdb").unwrap();
    let ip_v4 = "120.24.78.129";
    let info  = searcher.search(ip_v4).unwrap();
    println!("{}", info)
    // => `中国|0|广东省|深圳市|阿里云`
    let info  = searcher.std_search(ip_v4).unwrap();
    println("{:?}", info)
    // => `Location { contry: Some("中国"), region: None, province: Some("广东省"), city: Some("深圳市"), isp: Some("阿里云") }`
}