C/C++UDP套接字之一般流程

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一、UDP套接字服务端架构步骤

1． //初始化套接字环境WSAStartup
2． //初始化地址和端口
3． //创建UDP套接字socket
4． //绑定端口bind
5． //用recvfrom接收数据
6． //用sendto发送数据
7． //退出或者返回第5步继续

二、UDP客户端架构步骤

1． //初始化套接字环境WSAStartup
2． //初始化地址和端口
3． //创建UDP套接字socket
4． //用sendto发送数据
5． //用recvfrom接收数据

三、示例

服务器：

#include <winsock.h>#include <stdio.h>#include <iostream>#pragma comment(lib, "ws2_32.lib")using namespace std;int main(){/*===================UDP套接字服务端架构步骤=================*/printf("server:\n");//1、初始化套接字环境WSAStartupWSADATA wsadata;int nError = WSAStartup(MAKEWORD(2, 2), &wsadata);if (nError != 0){printf("初始化 ERROR\n");return -1;}//2、初始化地址和端口unsigned short CPORT = 6556;SOCKADDR_IN serverAddr, clientAddr;serverAddr.sin_family = AF_INET;serverAddr.sin_port = htons(CPORT);//端口serverAddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY);//IP//3、创建UDP套接字socketSOCKET server = socket(AF_INET, SOCK_DGRAM, 0);//make a socketif (server == INVALID_SOCKET){printf("create socket failed!\n");closesocket(server);WSACleanup();return -1;}//4、绑定端口bindint retVal = bind(server, (sockaddr*)(&serverAddr), sizeof(serverAddr));//bind socket to addressif (retVal == SOCKET_ERROR){printf("bind failed!\n");closesocket(server);WSACleanup();return -1;}//5、用recvfrom接收数据int len = sizeof(clientAddr);while (1){char buf[256] = {};int r = recvfrom(server, buf, 256, 0, (sockaddr*)&clientAddr, &len);if (r == SOCKET_ERROR){printf("server 接收数据出错\n");}UINT uip = clientAddr.sin_addr.S_un.S_addr;printf("%s 来自于IP:%d.%d.%d,%d \n", buf, LOBYTE(uip), HIBYTE(uip), LOBYTE(HIWORD(uip)), HIBYTE(HIWORD(uip)));//6、用sendto发送数据char sbuf[256] = {};cin.getline(sbuf, 256);sendto(server, sbuf, 256, 0, (sockaddr*)&clientAddr, len);//7、退出或者返回第5步继续}getchar();getchar();return 0;}

客户端：

#include <winsock.h>#include <stdio.h>#include <iostream>#pragma comment(lib, "ws2_32.lib")using namespace std;int main(){/*===================UDP套接字客户端架构步骤=================*/printf("client:\n");//1、初始化套接字环境WSAStartupWSADATA wsadata;int nError = WSAStartup(MAKEWORD(2, 2), &wsadata);if (nError != 0){printf("初始化 ERROR\n");return -1;}//2、初始化地址和端口unsigned short CPORT = 6556;SOCKADDR_IN serverAddr, clientAddr;serverAddr.sin_family = AF_INET;serverAddr.sin_port = htons(CPORT);//端口serverAddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");//IP//3、创建UDP套接字socketSOCKET client = socket(AF_INET, SOCK_DGRAM, 0);//make a socketif (client == INVALID_SOCKET){printf("create socket failed!\n");closesocket(client);WSACleanup();return -1;}//6、用sendto发送数据while (1){char sbuf[256] = {};cin.getline(sbuf, 256);sendto(client, sbuf, 256, 0, (sockaddr*)&serverAddr, sizeof(serverAddr));//5、用recvfrom接收数据int len = sizeof(clientAddr);char buf[256] = {};int r = recvfrom(client, buf, 256, 0, (sockaddr*)&clientAddr, &len);if (r == SOCKET_ERROR){printf("client 接收数据出错\n");}UINT uip = clientAddr.sin_addr.S_un.S_addr;printf("%s 来自于IP:%d.%d.%d,%d \n", buf, LOBYTE(uip), HIBYTE(uip), LOBYTE(HIWORD(uip)), HIBYTE(HIWORD(uip)));//7、退出或者返回第5步继续}getchar();getchar();return 0;}

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