批量设置默认网关和DNS

环境：VS2022

配置：使用Release版本输出的exe，否则在使用时会提示少dll

代码：

#ifndef CMDEXC_H
#define CMDEXC_H

#include <cstring>
#include<cstdio>
#include<iostream>
#include <regex>
#include <iostream>
using namespace std;


class CmdExc
{
public:
    CmdExc(std::string cmd, std::string mode = "rt");
    virtual ~CmdExc();

    std::string getOutput() const;

private:
    std::string m_strOutput__;
    FILE* m_fp__;
};



CmdExc::CmdExc(std::string cmd, std::string mode)
{
    m_fp__ = _popen(cmd.c_str(), mode.c_str());
    char buf[256] = { 0 };
    if (NULL != m_fp__) {
        int read_len;
        while ((read_len = fread(buf, sizeof(buf) - 1, 1, m_fp__)) > 0) {
            m_strOutput__ += buf;
            memset(buf, 0, sizeof(buf));
        }
    }

}

CmdExc::~CmdExc()
{
    if (NULL != m_fp__) {
        _pclose(m_fp__);
    }
}

std::string CmdExc::getOutput() const
{
    return m_strOutput__;
}

#endif // CMDEXC_H

std::string extractIP(const std::string& text) {
    std::regex ipRegex("(\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3})");
    std::smatch match;

    if (std::regex_search(text, match, ipRegex)) {
        return match.str();
    }
    else {
        return "No IP found";
    }
}

int main() {

    printf("正在设置默认网关和DNS....\n");
    CmdExc cmd("ipconfig");
    string text = cmd.getOutput().c_str();
    string ip = extractIP(text);
    string command = "netsh interface ip set address \"以太网 3\" source=static address=" + ip+" 255.255.224.0 gateway=192.168.0.2";
    system(command.c_str());
    command = "netsh interface ip set dnsservers \"以太网 3\" static 223.5.5.5 primary no";
    system(command.c_str());
    printf("设置成功\n");
    system("pause");
    
}