MFC自动获取网络地址函数实现----广播地址，网关，子网掩码

灰太狼 2022-08-03 23:54 225阅读 0赞

void CSetSignalBoxDlg::OnBnClickedButtonGetbroadcastaddr()  
\{ //注释部分为另一种获取IP方式，可略过  
//char Name\[255\];//定义用于存放获得的主机名的变量  
//char \*IP;//定义IP地址变量  
//CString strIP="";  
//PHOSTENT hostinfo;  
//if(gethostname (Name, sizeof(Name)) == 0)  
//\{  
// //如果成功地将本地主机名存放入由name参数指定的缓冲区中  
// if((hostinfo = gethostbyname(Name)) != NULL)  
// \{  
// //这是获取主机名，如果获得主机名成功的话，将返回一个指针，指向hostinfo，hostinfo  
// //为PHOSTENT型的变量，下面即将用到这个结构体  
// IP = inet\_ntoa (\*(struct in\_addr \*)\*hostinfo->h\_addr\_list);  
// strIP.Format(IP);  
// \}  
//\}  
  
  
 CString strIP;  
CString strMask;  
CString strBroadcast;  
CString strGateway;  
in\_addr broadcast;  
  
PIP\_ADAPTER\_INFO pAdapterInfo; //IP\_ADAPTER\_INFO结构体存储网卡信息，包括网卡名、网卡描述、网卡MAC地址、网卡IP等  
PIP\_ADAPTER\_INFO pAdapter = NULL;  
DWORD dwRetVal = 0;  
pAdapterInfo = ( IP\_ADAPTER\_INFO \*) malloc( sizeof( IP\_ADAPTER\_INFO ) );  
ULONG ulOutBufLen;  
//得到结构体大小,用于GetAdaptersInfo参数  
ulOutBufLen = sizeof(IP\_ADAPTER\_INFO);  
// 第一次调用GetAdapterInfo获取ulOutBufLen大小  
//调用GetAdaptersInfo函数,填充pIpAdapterInfo指针变量;其中ulOutBufLen参数既是一个输入量也是一个输出量  
if (GetAdaptersInfo( pAdapterInfo, &ulOutBufLen) == ERROR\_BUFFER\_OVERFLOW)  
\{  
free(pAdapterInfo);  
pAdapterInfo = (IP\_ADAPTER\_INFO \*) malloc (ulOutBufLen);  
\}  
if ((dwRetVal = GetAdaptersInfo( pAdapterInfo, &ulOutBufLen)) == NO\_ERROR)  
\{  
pAdapter = pAdapterInfo;  
while (pAdapter) //有多个网卡  
\{  
strIP.Format(\_T("%s"), pAdapter->IpAddressList.IpAddress.String);  
strMask.Format(\_T("%s"),pAdapter->IpAddressList.IpMask.String);  
strGateway.Format(\_T("%s"),pAdapter->GatewayList.IpAddress.String);  
pAdapter = pAdapter->Next;  
  
\}  
  
broadcast.S\_un.S\_addr =(inet\_addr(strIP) & inet\_addr(strMask))| (~inet\_addr(strMask));  
strBroadcast = inet\_ntoa(broadcast);   
\}  
SetDlgItemText(IDC\_EDIT\_ServerIP,strBroadcast);  
SetDlgItemText(IDC\_EDIT\_SubnetMask,strMask);  
SetDlgItemText(IDC\_EDIT\_Gateway,strGateway);  
if (pAdapterInfo)  
\{  
free(pAdapterInfo);  
\}  
  
\}