1、vs2019下添加ws2_32.lib
右鍵項目—>屬性—>鏈接器—>輸入—>附加依賴項，點擊編輯，添加ws2_32.lib庫文件

或者是在cpp源文件中用 #pragma comment(lib,“ws2_32.lib”)來代替。
服務器端源程序

#include<iostream> #include<stdio.h> #include<WinSock2.h> #include<string.h>using namespace std;#pragma comment(lib,"ws2_32.lib") #pragma warning(disable:4996)int main() { //初始化WSAWORD sockVersion = MAKEWORD(2, 2);WSAData wsaData;if (WSAStartup(sockVersion, &wsaData) != 0) {return 0;}//創建套接字SOCKET slisten = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);if (slisten == INVALID_SOCKET) {printf("socket error!");return 0;}//綁定IP和端口號sockaddr_in sin;sin.sin_family = AF_INET;sin.sin_port = htons(8888);sin.sin_addr.S_un.S_addr = INADDR_ANY;if (bind(slisten, (LPSOCKADDR)&sin, sizeof(sin)) == SOCKET_ERROR) {printf("bind error!");}//開始監聽if (listen(slisten, 5) == SOCKET_ERROR) {printf("listen error!");return 0;}//循環接受數據SOCKET sClient;sockaddr_in remoteAddr;int nAddrlen = sizeof(remoteAddr);char revData[255];while (true) {printf("等待連接。。。。。\n");sClient = accept(slisten, (SOCKADDR*)&remoteAddr, &nAddrlen);if (sClient == INVALID_SOCKET) {printf(" 接受錯誤!");continue;}printf("接收到一個連接：%s\r\n", inet_ntoa(remoteAddr.sin_addr));//接收數據int ret = recv(sClient, revData, 255, 0);if (ret> 0) {revData[ret] = 0x00;printf(revData);}//發送數據const char* sendData = "你好，TCP客戶端！\n";send(sClient, sendData, strlen(sendData), 0);closesocket(sClient);}closesocket(slisten);WSACleanup();return 0; }

客戶端源程序

#include<iostream > #include<stdio.h>#include<WinSock2.h>#include<cstring> using namespace std;#pragma comment(lib,"ws2_32.lib")int main() {WORD sockVersion = MAKEWORD(2, 2);WSADATA data;if (WSAStartup(sockVersion, &data) != 0) {return 0;}while (true) {SOCKET sclient = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);if (sclient == INVALID_SOCKET) {printf("invalid socket!");return 0;}sockaddr_in serAddr;serAddr.sin_family = AF_INET;serAddr.sin_port = htons(8848);//inet_pton(AF_INET, "127.0.0.1", &serAddr.sin_addr.s_addr);serAddr.sin_addr.S_un.S_addr = inet_addr("");if (connect(sclient, (sockaddr*)&serAddr, sizeof(serAddr)) == SOCKET_ERROR){//連接失敗printf("connect error!");closesocket(sclient);return 0;}string data;cin >> data;const char* sendData;sendData = data.c_str(); //string轉換為const char*//char* sendData = ("你好，TCP服務器端，我是客戶端\n");send(sclient, sendData, strlen(sendData), 0);char recData[255];int ret = recv(sclient, recData, 255, 0);if (ret > 0) {recData[ret] = 0x00;printf(recData);}closesocket(sclient);}WSACleanup();return 0;}

總結

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