[转]C++验证IP是否可以PING通

https://www.cnblogs.com/guoyz1314/p/3527340.html

#include <Winsock2.h>
#include "iphlpapi.h" 
   
#pragma comment(lib,"Iphlpapi.lib")
#pragma comment(lib,"Ws2_32.lib")
typedef HANDLE (WINAPI* ICMPCREATEFILE)(VOID);   
typedef BOOL (WINAPI* ICMPCLOSEHANDLE)(HANDLE);   
typedef DWORD (WINAPI* ICMPSENDECHO)(HANDLE, DWORD, LPVOID, WORD,PIP_OPTION_INFORMATION, LPVOID, DWORD, DWORD);    
                       
//定义三个指针函数   
ICMPCREATEFILE pIcmpCreateFile;   
ICMPCLOSEHANDLE pIcmpCloseHandle;   
ICMPSENDECHO pIcmpSendEcho; 
// 函数功能：初始化ICMP函数：
BOOL InitIcmp()   
{   
    HINSTANCE hIcmp = LoadLibrary("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;   
}

// 函数功能：判断是否能ping通IP
// 函数参数：IP地址或域名
BOOL ICMPPing(char* host) 
{   
    DWORD timeOut=1000;                                              //设置超时   
    ULONG hAddr=inet_addr(host);                                     //如果是IP地址就直接转换   
    if(hAddr==INADDR_NONE)   
    {   
        hostent* hp=gethostbyname(host);                             //如果是域名就用DNS解析出IP地址   
        if(hp)   
            memcpy(&hAddr,hp->h_addr_list,hp->h_length);             //IP地址   
        else
        {   
            return false;   
        }   
    }   
    HANDLE hIp=pIcmpCreateFile();   
    IP_OPTION_INFORMATION ipoi;   
    memset(&ipoi,0,sizeof(IP_OPTION_INFORMATION));   
    ipoi.Ttl =128;                  //Time-To-Live   
                    
    unsigned char pSend[36];                                                                   //发送包   
    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);             //发送ICMP数据报文   
                    
    if(pEchoReply->Status!=0)                                                                  //超时，可能是主机禁用了ICMP 或者目标主机不存在  
    {   
        pIcmpCloseHandle(hIp);   
        return false;   
    }   
                    
    pIcmpCloseHandle(hIp);   
    return true;   
}
int main()
{
 InitIcmp();
 ICMPPing("192.168.0.1");
 return 0;
}