c++中TCP客户端与服务端示例

客户端:

新版本中&＃xff0c;加入了#include #pragma comment(lib, "Ws2_32.lib")进行预编译


#include
#include
#include
#include
#pragma comment(lib, "Ws2_32.lib")class tcpClient{public:tcpClient() {}void buildClient(){std::cout <<"### TCP/IP Client Demo ###" <" < " <#include int socket(int domain, int type, int protocol);1.domain表示协议簇&＃xff0c;常用协议簇有:AF_UNIX&＃xff08;本机通信&＃xff09;AF_INET&＃xff08;TCP/IP – IPv4&＃xff09;AF_INET6&＃xff08;TCP/IP – IPv6&＃xff09;2.type表示套接字类型,常用套接字有:SOCK_STREAM&＃xff08;TCP流&＃xff09;SOCK_DGRAM&＃xff08;UDP数据报&＃xff09;SOCK_RAW&＃xff08;原始套接字&＃xff09;3.最后一个 “protocol”一般设置为“0”&＃xff0c;也就是当确定套接字使用的协议簇和类型时&＃xff0c;这个参数的值就为0&＃xff0c;但是有时候创建原始套接字时&＃xff0c;并不知道要使用的协议簇和类型&＃xff0c;也就是domain参数未知情况下&＃xff0c;这时protocol这个参数就起作用了&＃xff0c;它可以确定协议的种类。4.socket是一个函数&＃xff0c;那么它也有返回值&＃xff0c;当套接字创建成功时&＃xff0c;返回套接字&＃xff0c;失败返回“-1”&＃xff0c;错误代码则写入“errno”中。*/SOCKET sockClient &＃61; socket(AF_INET, SOCK_STREAM, 0);if (INVALID_SOCKET &＃61;&＃61; sockClient) {std::cout <<"[E] Create socket failed! Error code is: " <中定义&＃xff0c;sockaddr的缺陷是&＃xff1a;sa_data把目标地址和端口信息混在一起了&＃xff0c;如下&＃xff1a;struct sockaddr {sa_family_t sin_family;//地址族char sa_data[14]; //14字节&＃xff0c;包含套接字中的目标地址和端口信息};2.sockaddr_in:sockaddr_in在头文件#include或#include 中定义&＃xff0c;该结构体解决了sockaddr的缺陷&＃xff0c;把port和addr 分开储存在两个变量中sin_family:地址族sin_port:端口sin_addr:32位IP地址sin_zero:不需要*/SOCKADDR_IN addrServer;inet_pton(AF_INET, "127.0.0.1", &addrServer.sin_addr.s_addr);//addrServer.sin_addr.s_addr &＃61; inet_addr("127.0.0.1") /*inet_addr(m_server_addr)*/;addrServer.sin_family &＃61; AF_INET;addrServer.sin_port &＃61; htons(8000)/*htons(m_server_port)*/;//std::cout <<"[I] Current addr is: " <> strBuf;send(sockClient, strBuf.data(), strBuf.length(), 0);char recvBuf[100] &＃61; { 0 };recv(sockClient, recvBuf, 100, 0);std::cout <<"[I] Receive data from server: " <

服务端:


#include
#include
#include#pragma comment(lib, "Ws2_32.lib")class tcpServer{public:tcpServer() {}void buildServer(){std::cout <<"### TCP/IP Server Demo ###" <" <