根据IP获取用户的地理位置
1.根据IP获取用户地理位置思路：
通过IP地址去查询数据库，然后从数据库里面提取相应地理位置信息
2.下载MaxMind的数据库下载地址
https://dev.maxmind.com/geoip/geoip2/geolite2/
它有 binary格式 和 CSV格式的，可以先都下载:
GeoLite2-City.mmdb.gz
GeoLite2-Country.mmdb.gz
GeoLite2-City-CSV_20180306.zip
GeoLite2-Country-CSV_20180306.zip3.然后是操作它数据库的libmaxminddb的github地址：
https://github.com/maxmind/libmaxminddb/releases
libmaxminddb安装命令:
$ ./configure
$ make
$ make check
$ sudo make install
$ sudo ldconfiglibmaxminddb说明文档地址:
http://maxmind.github.io/libmaxminddb/
而且还给出一个例子：
#include 编译命令：gcc -v test.c -o mmdb -lmaxminddb
命令如下：
./mmdb <dbpath> <IP>
./mmdb /home/share/GeoLite2-City.mmdb 112.225.35.70效果如下：
{
"city":
{
"geoname_id":
1805753
"names":
{
"de":
"Jinan"
"en":
"Jinan"
"es":
"Jinan"
"fr":
"Jinan"
"ja":
"済南市"
"pt-BR":
"Jinan"
"ru":
"Цзинань"
"zh-CN":
"济南"
}
}
"continent":
{
"code":
"AS"
"geoname_id":
6255147
"names":
{
"de":
"Asien"
"en":
"Asia"
"es":
"Asia"
"fr":
"Asie"
"ja":
"アジア"
"pt-BR":
"Ásia"
"ru":
"Азия"
"zh-CN":
"亚洲"
}
}
"country":
{
"geoname_id":
1814991
"iso_code":
"CN"
"names":
{
"de":
"China"
"en":
"China"
"es":
"China"
"fr":
"Chine"
"ja":
"中国"
"pt-BR":
"China"
"ru":
"Китай"
"zh-CN":
"中国"
}
}
"location":
{
"accuracy_radius":
50
"latitude":
36.668300
"longitude":
116.997200
"time_zone":
"Asia/Shanghai"
}
"registered_country":
{
"geoname_id":
1814991
"iso_code":
"CN"
"names":
{
"de":
"China"
"en":
"China"
"es":
"China"
"fr":
"Chine"
"ja":
"中国"
"pt-BR":
"China"
"ru":
"Китай"
"zh-CN":
"中国"
}
}
"subdivisions":
[
{
"geoname_id":
1796328
"iso_code":
"SD"
"names":
{
"en":
"Shandong"
"fr":
"Province de Shandong"
"zh-CN":
"山东省"
}
}
]
}单独获取其他信息：
比如我只想获取国家，省份和城市我写的例子如下：
/*
* gcc -v test.c -o mmdb -lmaxminddb
*/
#include \n" );
exit(1);
}
int status = MMDB_open(filename, MMDB_MODE_MMAP, &mmdb);
if (MMDB_SUCCESS != status){
printf("can't open %s - %s\n", filename, MMDB_strerror(status));
if ( MMDB_IO_ERROR == status ) {
printf(" IO error: %s\n", strerror(errno));
}
exit(1);
}
int gai_error, mmdb_error;
MMDB_lookup_result_s result = MMDB_lookup_string(&mmdb, ip_address, &gai_error, &mmdb_error);
if (0 != gai_error) {
printf("Error from getaddrinfo for %s - %s\n\n",
ip_address, gai_strerror(gai_error));
exit(2);
}
if (MMDB_SUCCESS != mmdb_error) {
printf("Got an error from libmaxminddb: %s\n\n",
MMDB_strerror(mmdb_error));
exit(3);
}
MMDB_entry_data_s entry_data;
// get country
status = MMDB_get_value(&result.entry, &entry_data,
"country", "iso_code", NULL);
if ( ! entry_data.has_data ) {
printf("entry_data has no data\n");
goto end;
}
if ( entry_data.type != MMDB_DATA_TYPE_UTF8_STRING ) {
printf("entry_data's type isn't UTF-8");
goto end;
}
memcpy(country, entry_data.utf8_string, entry_data.data_size);
printf("country:%s\n", country);
// get province
status = MMDB_get_value(&result.entry, &entry_data,
"subdivisions", "0", "names", "en", NULL);
if ( ! entry_data.has_data ) {
printf("entry_data has no data\n");
goto end;
}
if ( entry_data.type != MMDB_DATA_TYPE_UTF8_STRING ) {
printf("entry_data's type isn't UTF-8");
goto end;
}
memcpy(province, entry_data.utf8_string, entry_data.data_size);
printf("province:%s\n", province);
// get city
status = MMDB_get_value(&result.entry, &entry_data,
"city", "names", "en", NULL);
if ( ! entry_data.has_data ) {
printf("entry_data has no data\n");
goto end;
}
if ( entry_data.type != MMDB_DATA_TYPE_UTF8_STRING ) {
printf("entry_data's type isn't UTF-8");
goto end;
}
memcpy(city, entry_data.utf8_string, entry_data.data_size);
printf("city:%s\n", city);
end:
MMDB_close(&mmdb);
exit(0);
}命令：./mmdb 112.225.35.70
效果如图：
