ヘッダーファイル(icmp.hpp)

#pragma once
#include <stdio.h>
#include <WinSock2.h>
#include <WS2tcpip.h>
#include <iphlpapi.h>
#include <IcmpAPI.h>
class ICMP
{
public:
    ICMP();
    ~ICMP();
    int Ping(const char *HostAddress);
protected:
    HANDLE hIcmp;
    char *SendData = "ICMP";
    LPVOID ReplyBuffer;
    DWORD dwRetVal;
    DWORD buflen;
    PICMP_ECHO_REPLY pIcmpEchoReply;
    sockaddr_in addr;
    const char *HostAddress;
};

ソースファイル(icmp.cpp)

#include "icmp.hpp"
ICMP::ICMP()
{
    hIcmp = IcmpCreateFile();
    buflen = sizeof(ICMP_ECHO_REPLY) + strlen(SendData) + 1;
    ReplyBuffer = (VOID*)malloc(buflen);
}
int ICMP::Ping(const char *HostAddress)
{
    if (ReplyBuffer == NULL)
    {
        return 1;
    }
    memset(ReplyBuffer, 0, buflen);
    pIcmpEchoReply = (PICMP_ECHO_REPLY)ReplyBuffer;
    dwRetVal = IcmpSendEcho(hIcmp,
        InetPton(AF_INET, HostAddress, &addr.sin_addr.S_un.S_addr),
        SendData,
        strlen(SendData),
        NULL,
        ReplyBuffer,
        buflen,
        1000);
    if (dwRetVal != 0)          //PING成功
    {
        return 0;
    } else {
        return 1;
    }
}
ICMP::~ICMP()
{
    free(ReplyBuffer);
    IcmpCloseHandle(hIcmp);
}