ip:可独一标识网络上的一个主机；
协议+端口：可独一标识主机中一个进程；
所以通过IP+协议+端口三元组来标识主机中的进程。
三、编程实现
#pragma once #define WIN32 #include<iostream> #include<stdio.h> #include "stdafx.h" #include<sys/types.h> #include<WS2tcpip.h> #pragma comment(lib, "ws2_32.lib") using namespace std; //typedef int(*DLLFunc)(int,int);//int是该要领形参的类型，，有几个参数就界说几个。 //typedef int(*DLLFunc2)(); DWORD WINAPI ThreadFunc(HANDLE Thread) { //HINSTANCE hInstLibrary = LoadLibrary(_T("E:\\V3.0\\新建文件夹\\MyDll.dll"));//要写清楚路径,注意双斜杠 //if (GetLastError() != 0) //{ // std::cout << GetLastError();//打印掉败信息 //} //if (hInstLibrary == NULL) //{ // FreeLibrary(hInstLibrary); // return 0; //} //DLLFunc2 dllFunc3; //dllFunc3 = (DLLFunc2)GetProcAddress(hInstLibrary, "SocketSevert"); //int i3 = dllFunc3(); //cout << i3 << endl; //FreeLibrary(hInstLibrary); //处事器端 0告成；22套接字；3绑定；4监听 WORD sockVersion = MAKEWORD(2, 2); WSADATA wsaData; if (WSAStartup(sockVersion, &wsaData) != 0) { printf("-3"); //return -3; } // 创建通信端点：套接字 int sockfd = socket(AF_INET, SOCK_STREAM, 0); if (sockfd < 0) { printf("处事器创建套接字掉败！\n"); } else { printf("处事器创建套接字告成！\n"); } struct sockaddr_in my_addr; my_addr.sin_family = AF_INET; my_addr.sin_port = htons(8888); my_addr.sin_addr.s_addr = htonl(INADDR_ANY); //绑定 int err_log = bind(sockfd, (struct sockaddr*)&my_addr, sizeof(my_addr)); if (err_log != 0) { printf("处事器绑定掉败！\n"); } else { printf("处事器绑定告成！\n"); } //监听 err_log = listen(sockfd, 10); if (err_log != 0) { printf("处事器监听掉败！\n"); } else { printf("处事器监听告成！\n"); } Sleep(10); int i = 0; while (1) { i++; struct sockaddr_in client_addr; char cli_ip[INET_ADDRSTRLEN] = ""; socklen_t cliaddr_len = sizeof(client_addr); //告成返回一个新的socket文件描述符，用于和客户端通信，掉败返回-1 //暗示三方握手完成，下一步处事器挪用accept()接受连接 int connfd = accept(sockfd, (struct sockaddr*)&client_addr, &cliaddr_len); if (connfd < 0) { printf("accept第%d次掉败\n",i); continue; } else { printf("accept第%d次告成\n", i); } //接收数据 char recv_buf[512] = { 0 }; while (recv(connfd, recv_buf, sizeof(recv_buf), 0) > 0) { i = sizeof(recv_buf); while (i--) printf("接收数据：\n%c\n",recv_buf[i]); } } return 0; } int main() { //DLLFunc2 dllFunc2; //// hdll=LoadLibraryEx("*.dll", NULL, LOAD_WITH_ALTERED_SEARCH_PATH)，若dll库中有其他dll的挪用，就使用此语句 //HINSTANCE hInstLibrary = LoadLibrary(_T("E:\\V3.0\\新建文件夹\\MyDll.dll"));//要写清楚路径,注意双斜杠 //if (GetLastError() != 0) //{ // std::cout << GetLastError();//打印掉败信息 //} //if (hInstLibrary == NULL) //{ // FreeLibrary(hInstLibrary); // return 0; //} //线程---处事器 HANDLE Thread; DWORD dwThreadId; Thread = ::CreateThread(NULL, 0, ThreadFunc, NULL, 0, &dwThreadId); //cout << "The new thread ID is :" << dwThreadId << endl; //客户端 WORD sockVersion = MAKEWORD(2, 2); WSADATA wsaData; if (WSAStartup(sockVersion, &wsaData) != 0) { return -1; } SOCKET sockClient = NULL; SOCKADDR_IN addrSrv; //addrSrv.sin_addr.S_un.S_addr = inet_addr("127.0.0.1"); inet_pton(AF_INET, "128.0.0.1", (void*)&addrSrv.sin_addr.S_un.S_addr); addrSrv.sin_family = AF_INET; addrSrv.sin_port = htons(8888); //创建套接字 sockClient = socket(AF_INET, SOCK_STREAM, 0); if (sockClient < 0) { printf("创建套接字掉败！\n"); } else { printf("创建套接字告成！\n"); } //网络连接 if (connect(sockClient, (SOCKADDR*)&addrSrv, sizeof(SOCKADDR)) == SOCKET_ERROR) { printf("connect掉败！\n"); } else { printf("网络连接告成！\n"); char send_buf[12] = { 'c','d' }; int nRecv = ::send(sockClient, send_buf, sizeof(send_buf), 0); if (nRecv < 0) { printf("发送掉败！\n"); } else { printf("发送告成！\n"); } } //SocketConnect是DLL库里界说的要领 //dllFunc2 = (DLLFunc2)GetProcAddress(hInstLibrary, "SocketConnect"); //if (dllFunc2 == NULL) //{ // FreeLibrary(hInstLibrary); // return 0; //} //int i2 = dllFunc2(); //cout << i2 << endl; //FreeLibrary(hInstLibrary); ::WaitForSingleObject(Thread, INFINITE); ::CloseHandle(Thread); return 0; }socket网络编程--基于windows