在VS上開發，還需要做鏈接好“WS2_32.lib”
就在項目屬性–> 鏈接器 –> 輸入 –> 編輯 –> 輸入”WS2_32.lib”
就搞定了~

#include<winsock.h> #include <iostream> using namespace std; //#pragma comment(lib, 'WS2_32.lib')int main() {WSADATA data;WORD w = MAKEWORD(2, 0);char sztext[] = "Welcome";::WSAStartup(w, &data); // 初始化套接字庫SOCKET s, s1;s = ::socket(AF_INET, SOCK_DGRAM, 0); // 創建套接字s1 = ::socket(AF_INET, SOCK_DGRAM, 0); // 創建套接字sockaddr_in addr, addr2;int n = sizeof(addr2);addr.sin_family = AF_INET; // 初始化地址結構addr.sin_port = htons(75);addr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");::bind(s, (sockaddr *)&addr, sizeof(addr));cout << "Serve Running\n";int count = 100;addr2.sin_family = AF_INET;addr2.sin_port = htons(75);addr2.sin_addr.S_un.S_addr = inet_addr("172.16.6.2");::bind(s1, (sockaddr *)& addr2, sizeof(addr));for (int i = 0; i < count; ++i)::sendto(s, "Hello Client\n", 15, 0, (SOCKADDR*)&addr2, sizeof(SOCKADDR));cout << "Finish!" << endl;::closesocket(s);::closesocket(s1);::WSACleanup();system("pause"); }

客戶端（用于接受UDP包，并顯示這100個包）

#include <iostream> #include <string> using namespace std; #include <WinSock2.h> #pragma comment(lib, "WS2_32.lib") int main() {WSADATA data;WORD w = MAKEWORD(2, 0);::WSAStartup(w, &data);// 初始化套接字庫SOCKET s; // 定義套接字s = ::socket(AF_INET, SOCK_DGRAM, 0);sockaddr_in addr, addr2;string ip;char buffer[10] = { 0 };cin >> ip;addr.sin_family = AF_INET;addr.sin_port = htons(75);addr.sin_addr.S_un.S_addr = inet_addr(ip.c_str());bind(s, (sockaddr*)&addr, sizeof(addr));cout << "UDP Server is running\n";int n = sizeof(addr2);for (int i = 0;i < 100;++i) {if (recvfrom(s, buffer, 10, 0, (sockaddr*)&addr2, &n) != 0 && buffer) {cout << buffer << endl;}}closesocket(s);WSACleanup();system("pause"); }

總結

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