??本文提供利用SIO_GET_INTERFACE_LIST實現本地網關查詢的簡單工具代碼。

#include <iostream> #define WIN32_LEAN_AND_MEAN#include <windows.h> #include <winsock2.h> #include <ws2tcpip.h> #include <stdio.h>// Need to link with Ws2_32.lib #pragma comment(lib, "ws2_32.lib")using namespace std;int doit() {//創建套接字SOCKET sd = WSASocket(AF_INET, SOCK_DGRAM, 0, 0, 0, 0);if (sd == SOCKET_ERROR) {cerr << "Failed to get a socket. Error " << WSAGetLastError() <<endl; return 1;}//獲取網關信息，保存在InterfancList中INTERFACE_INFO InterfaceList[20];unsigned long nBytesReturned;if (WSAIoctl(sd, SIO_GET_INTERFACE_LIST, 0, 0, &InterfaceList,sizeof(InterfaceList), &nBytesReturned, 0, 0) == SOCKET_ERROR) {cerr << "Failed calling WSAIoctl: error " << WSAGetLastError() <<endl;return 1;}//輪詢讀取信息并打印int nNumInterfaces = nBytesReturned / sizeof(INTERFACE_INFO);cout << "There are " << nNumInterfaces << " interfaces:" << endl;for (int i = 0; i < nNumInterfaces; ++i) {cout << endl;char sendBuf[20] = { '\0' };sockaddr_in *pAddress;pAddress = (sockaddr_in *)&(InterfaceList[i].iiAddress);cout << " " << inet_ntop(AF_INET, &pAddress->sin_addr, sendBuf, 16) << endl;pAddress = (sockaddr_in *)&(InterfaceList[i].iiBroadcastAddress);cout << " has bcast " << inet_ntop(AF_INET, &pAddress->sin_addr, sendBuf, 16) << endl;pAddress = (sockaddr_in *)&(InterfaceList[i].iiNetmask);cout << " and netmask " << inet_ntop(AF_INET, &pAddress->sin_addr, sendBuf, 16) << endl;cout << " Iface is ";u_long nFlags = InterfaceList[i].iiFlags;if (nFlags & IFF_UP) cout << "up";else cout << "down";if (nFlags & IFF_POINTTOPOINT) cout << ", is point-to-point";if (nFlags & IFF_LOOPBACK) cout << ", is a loopback iface";cout << ", and can do: ";if (nFlags & IFF_BROADCAST) cout << "bcast ";if (nFlags & IFF_MULTICAST) cout << "multicast ";cout << endl;}return 0; }int main() {WSADATA WinsockData;if (WSAStartup(MAKEWORD(2, 2), &WinsockData) != 0) {cerr << "Failed to find Winsock 2.2!" << endl;return 2;}int nRetVal = doit();WSACleanup();return nRetVal; }

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