在使用电脑时我们可以根据在更改以太网Internet协议版本4(TCP/IP)的属性来设置动态IP和静态IP

但是这样做很麻烦，我们可以通过程序来更改静态IP和动态IP，只需要一条简单的代码就可以实现。

静态IP:

system("cmd /c netsh interface ip set address \"以太网\" static 192.168.1.10 255.255.255.0 192.168.1.1");

动态IP：

system("cmd /c netsh interface ip set address name = \"以太网\" source = dhcp");
system("netsh interface ip set dns name = \"以太网\" source = dhcp");

显示所有网络适配器(网卡、拨号连接等)的完整TCP/IP配置信息：

system("ipconfig /all");

注意：“以太网”是根据网络连接文件夹中的名称来命名的，有的是本地连接！！！

根据这两条指令可以制作一个简单的设置IP状态的小程序

测试结果：

1.设置静态IP

运行程序，输入1，再次输入IP地址，子网掩码，默认网关，提示静态IP设置成功。
找到以太网Internet协议版本4(TCP/IP)的属性看到设置成功。

2.输入2设置动态IP

运行程序，输入2，提示动态IP设置成功。
找到以太网Internet协议版本4(TCP/IP)的属性看到设置成功。

C代码：

#include<stdio.h>
#include<string.h>
#include<stdlib.h>int main()
{system("ipconfig /all");printf("\n");printf("------------------------------------------------------------------------\n");printf("设置静态IP输入:1\n");printf("设置动态IP输入:2\n");printf("------------------------------------------------------------------------\n");printf("请输入：");int model = 0;scanf_s("%d", &model);while (model != 1 && model != 2){printf("输入无效，请重新输入\n");printf("------------------------------------------------------------------------\n");printf("请输入：");scanf_s("%d", &model);if (model == 1 || model == 2)break;}if (model == 1)				//设置静态IP{char *ret = (char*)malloc(128);memset(ret, 0, sizeof(ret));char static_ip_1[] = "cmd /c netsh interface ip set address \"以太网\" static";char space[] = " ";printf("输入IP地址(192.168.1.110)：");char static_ip_2[20];scanf_s("%s", static_ip_2, 20);		printf("输入子网掩码(255.255.255.0)：");char static_mask[20];scanf_s("%s", static_mask, 20);		printf("输入默认网关(192.168.1.1)：");char static_gateway[20] = "";scanf_s("%s", static_gateway, 20);int len1 = strlen(static_ip_1) + 1;strcat_s(ret, len1, static_ip_1);//"cmd /c netsh interface ip set address \"以太网\" static"int len2 = strlen(ret) + strlen(space) + 1;strcat_s(ret, len2, space);//"cmd /c netsh interface ip set address \"以太网\" static "int len3 = strlen(ret) + strlen(static_ip_2) + 1;strcat_s(ret, len3, static_ip_2);//"cmd /c netsh interface ip set address \"以太网\" static 192.168.1.110"int len4 = strlen(ret) + strlen(space) + 1;strcat_s(ret, len4, space);//"cmd /c netsh interface ip set address \"以太网\" static 192.168.1.110 "int len5 = strlen(ret) + strlen(static_mask) + 1;strcat_s(ret, len5, static_mask);//"cmd /c netsh interface ip set address \"以太网\" static 192.168.1.110 255.255.255.0"int len6 = strlen(ret) + strlen(space) + 1;strcat_s(ret, len6, space);//"cmd /c netsh interface ip set address \"以太网\" static 192.168.1.110 255.255.255.0 192.168.1.1"int len7 = strlen(ret) + strlen(static_gateway) + 1;strcat_s(ret, len7, static_gateway);system(ret);free(ret);printf("静态IP设置成功\n");printf("------------------------------------------------------------------------\n");}else if (model == 2)		//设置动态IP{system("cmd /c netsh interface ip set address name = \"以太网\" source = dhcp");printf("动态IP设置成功\n");printf("------------------------------------------------------------------------\n");}else{printf("输入错误\n");}
}

C++代码：

#include <iostream>//分割线
void PrintLine()
{std::cout << "------------------------------------------------------------------------\n";
}int main()
{system("ipconfig /all");std::cout << std::endl;PrintLine();std::cout << "设置静态IP输入:1\n";std::cout << "设置动态IP输入:2\n";PrintLine();int model = 0;while (1){std::cout << "请输入：";std::cin >> model;if (model == 1 || model == 2)break;std::cout << "输入无效，请重新输入\n";PrintLine();}if (model == 1)				//设置静态IP{std::string static_prefix = "cmd /c netsh interface ip set address \"以太网\" static";std::string static_ip, static_mask, static_gateway;std::cout << "输入IP地址(192.168.1.110)：";std::cin >> static_ip;std::cout << "输入子网掩码(255.255.255.0)：";std::cin >> static_mask;std::cout << "输入默认网关(192.168.1.1)：";std::cin >> static_gateway;std::string static_ret = static_prefix + " " + static_ip + " " + static_mask + " " + static_gateway;const char* ret = static_ret.c_str();system(ret);std::cout << "静态IP设置成功\n";PrintLine();}else if (model == 2)		//设置动态IP{system("cmd /c netsh interface ip set address name = \"以太网\" source = dhcp");std::cout << "动态IP设置成功\n";PrintLine();}else{std::cout << "输入错误\n";}return 0;
}