获取本机IP及在本机IP的基础上自增1(只针对有一个IP的机器)

1、获取本机IP

 1 char* getLocalIP()
 2 {
 3     WSADATA wsaData;
 4     int err = WSAStartup(MAKEWORD(2, 0), &wsaData);
 5     if (err != 0)
 6     {
 7         OUTINFO_1_PARAM("ASTSWSAStartup执行错误%d
",err);
 8         return NULL;
 9     }
10     //获取主机名
11     char szHostName[256] = {0};
12     int nRetCode;
13     nRetCode = gethostname(szHostName,sizeof(szHostName) );
14     if (nRetCode != 0)
15     {
16         OUTINFO_0_PARAM("ASTS获取主机名称失败
");
17         WSAGetLastError(); 
18         WSACleanup();
19         return NULL; 
20     }
21 
22     //获取本机IP
23     char* lpLocalIP;
24     PHOSTENT hostinfo;
25     hostinfo = gethostbyname(szHostName);
26     if (hostinfo != NULL)
27     {
28         lpLocalIP = inet_ntoa(*(struct in_addr*)*hostinfo->h_addr_list);
29         OUTINFO_1_PARAM("ASTS主机名: %s
", szHostName);
30         OUTINFO_1_PARAM("ASTS本地IP: %s
", lpLocalIP);
31 
32         WSACleanup();
33         return lpLocalIP;
34     }
35     else
36     {
37         WSACleanup();
38         return NULL;
39     }
40 }

2、获取本机IP并在本机IP的基础上增加1

 1 char* getAddOneIP()
 2 {
 3     WSADATA wsaData;
 4     int err = WSAStartup(MAKEWORD(2, 0), &wsaData);
 5     if (err != 0)
 6     {
 7         OUTINFO_1_PARAM("ASTSWSAStartup执行错误%d
",err);
 8         return NULL;
 9     }
10     //获取主机名
11     char szHostName[256] = {0};
12     int nRetCode;
13     nRetCode = gethostname(szHostName,sizeof(szHostName) );
14     if (nRetCode != 0)
15     {
16         OUTINFO_0_PARAM("ASTS获取主机名称失败
");
17         WSAGetLastError(); 
18         WSACleanup();
19         return NULL; 
20     }
21 
22     //获取本机IP
23     char* lpLocalIP;
24     PHOSTENT hostinfo;
25     hostinfo = gethostbyname(szHostName);
26     if (hostinfo != NULL)
27     {
28         lpLocalIP = inet_ntoa(*(struct in_addr*)*hostinfo->h_addr_list);
29         OUTINFO_1_PARAM("ASTS主机名: %s
", szHostName);
30         OUTINFO_1_PARAM("ASTS本地IP: %s
", lpLocalIP);
31 
32         struct in_addr nextIP = {0};
33         memcpy(&nextIP, *hostinfo->h_addr_list, sizeof(nextIP));
34         nextIP.s_impno ++;        //下一个IP
35         char * lpNextIP = inet_ntoa(nextIP);
36         OUTINFO_1_PARAM("ASTS返回出去的IP地址: %s
", lpNextIP);
37         WSACleanup();
38         return lpNextIP;
39     }
40     else
41     {
42         WSACleanup();
43         return NULL;
44     }
45 }

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原文地址：https://www.cnblogs.com/LYF-LIUDAO/p/8464023.html