C++檢測是否ip能夠ping通

最近做項目，相機和plc的連接配接有時候會突然中斷，搜尋了下，找到一個可用的檢查 某ip是否可以連通的函數。需要調用icmp.dll

ping.h

icmp.dll下載下傳點這裡

#pragma once
#include <Winsock2.h>
#include "iphlpapi.h" 
#include<tchar.h>

#pragma comment(lib,"Iphlpapi.lib")
#pragma comment(lib,"Ws2_32.lib")
typedef HANDLE(WINAPI* ICMPCREATEFILE)(VOID);
typedef INT(WINAPI* ICMPCLOSEHANDLE)(HANDLE);
typedef DWORD(WINAPI* ICMPSENDECHO)(HANDLE, DWORD, LPVOID, WORD, PIP_OPTION_INFORMATION, LPVOID, DWORD, DWORD);

//定義三個指針函數   
ICMPCREATEFILE pIcmpCreateFile;
ICMPCLOSEHANDLE pIcmpCloseHandle;
ICMPSENDECHO pIcmpSendEcho;
// 函數功能：初始化ICMP函數：
BOOL InitIcmp()
{
	HINSTANCE hIcmp = LoadLibrary(_T("ICMP.DLL"));
	if (hIcmp == NULL)
	{
		return false;
	}
	pIcmpCreateFile = (ICMPCREATEFILE)GetProcAddress(hIcmp, "IcmpCreateFile");
	pIcmpCloseHandle = (ICMPCLOSEHANDLE)GetProcAddress(hIcmp, "IcmpCloseHandle");
	pIcmpSendEcho = (ICMPSENDECHO)GetProcAddress(hIcmp, "IcmpSendEcho");
	if ((pIcmpCreateFile == NULL) || (pIcmpCloseHandle == NULL) || (pIcmpSendEcho == NULL))
		return false;
	return true;
}

// 函數功能：判斷是否能ping通IP
// 函數參數：IP位址或域名
INT ICMPPing(char* host)
{
	DWORD timeOut = 1000;                                              //設定逾時   
	ULONG hAddr = inet_addr(host);                                     //如果是IP位址就直接轉換   
	if (hAddr == INADDR_NONE)
	{
		hostent* hp = gethostbyname(host);                             //如果是域名就用DNS解析出IP位址   
		if (hp)
			memcpy(&hAddr, hp->h_addr_list, hp->h_length);             //IP位址   
		else
		{
			return 0;
		}
	}
	HANDLE hIp = pIcmpCreateFile();
	IP_OPTION_INFORMATION ipoi;
	memset(&ipoi, 0, sizeof(IP_OPTION_INFORMATION));
	ipoi.Ttl = 128;                  //Time-To-Live   

	unsigned char pSend[36];                                                                   //發送包   
	memset(pSend, 'E', 32);

	int repSize = sizeof(ICMP_ECHO_REPLY) + 32;
	unsigned char pReply[100];                                                                 //接收包   
	ICMP_ECHO_REPLY* pEchoReply = (ICMP_ECHO_REPLY*)pReply;

	DWORD nPackets = pIcmpSendEcho(hIp, hAddr, pSend, 32, &ipoi, pReply, repSize, timeOut);             //發送ICMP資料封包   

	if (pEchoReply->Status != 0)                                                                  //逾時，可能是主機禁用了ICMP 或者目标主機不存在  
	{
		pIcmpCloseHandle(hIp);
		return 0;
	}

	pIcmpCloseHandle(hIp);
	return 1;
}
           

調用

#include"ping.h"
//…

//ready for ping test
InitIcmp();

int ping2C = ICMPPing("192.168.1.3");	// 0 fail, 1 yes