C++ Socket UDP "Hello World!"

时间：2016-10-03 08:51:25 阅读：213 评论：0 收藏：0 [点我收藏+]

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这是C++ SOCKET网络程序中的C/S结构之UDP "Hello World !"，共两个控制台工程：

[cpp] view plain copy

//////////////////////////////////////////////////////////////////////////
// UDPServer.cpp
#include <stdio.h>
#include <WINSOCK2.H>
#pragma comment(lib,"WS2_32.lib")
#define BUF_SIZE 64
int main(void)
{
WSADATA wsd;
SOCKET s;
int nRet;
// 初始化套接字动态库
if(WSAStartup(MAKEWORD(2,2),&wsd) != 0)
{
printf("WSAStartup failed !/n");
return 1;
}
// 创建套接字
s = socket(AF_INET,SOCK_DGRAM,0);
if(s == INVALID_SOCKET)
{
printf("socket() failed ,Error Code:%d/n",WSAGetLastError());
WSACleanup();
return 1;
}
SOCKET socketSrv = socket(AF_INET,SOCK_DGRAM,0);
SOCKADDR_IN addrSrv;
SOCKADDR_IN addrClient;
char buf[BUF_SIZE];
int len = sizeof(SOCKADDR);
// 设置服务器地址
ZeroMemory(buf,BUF_SIZE);
addrSrv.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
addrSrv.sin_family = AF_INET;
addrSrv.sin_port = htons(5000);
// 绑定套接字
nRet = bind(socketSrv,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR));
if(SOCKET_ERROR == nRet)
{
printf("bind failed !/n");
closesocket(s);
WSACleanup();
return -1;
}
// 从客户端接收数据
nRet = recvfrom(socketSrv,buf,BUF_SIZE,0,(SOCKADDR*)&addrClient,&len);
if(SOCKET_ERROR == nRet)
{
printf("recvfrom failed !/n");
closesocket(s);
WSACleanup();
return -1;
}
// 打印来自客户端发送来的数据
printf("Recv From Client:%s/n",buf);
// 向客户端发送数据
sendto(socketSrv,"UDP Hello World !",sizeof("UDP Hello World !"),0,(SOCKADDR*)&addrClient,len);
closesocket(s);
WSACleanup();
return 0;
}

[cpp] view plain copy

//////////////////////////////////////////////////////////////////////////
// UDPClient.cpp
#include <stdio.h>
#include <WINSOCK2.H>
#pragma comment(lib,"WS2_32.lib")
#define BUF_SIZE 64
int main(void)
{
WSADATA wsd;
SOCKET s;
// 初始化套接字动态库
if(WSAStartup(MAKEWORD(2,2),&wsd) != 0)
{
printf("WSAStartup failed !/n");
return 1;
}
// 创建套接字
s = socket(AF_INET,SOCK_DGRAM,0);
if(s == INVALID_SOCKET)
{
printf("socket() failed, Error Code:%d/n",WSAGetLastError());
WSACleanup();
return 1;
}
char buf[BUF_SIZE]; // 接受数据
SOCKADDR_IN servAddr; // 服务器套接字地址
SOCKET sockClient = socket(AF_INET,SOCK_DGRAM,0);
int nRet;
ZeroMemory(buf,BUF_SIZE);
strcpy(buf,"UDP Hello World !");
// 设置服务器地址
servAddr.sin_family = AF_INET;
servAddr.sin_addr.S_un.S_addr = inet_addr("192.168.1.254");
servAddr.sin_port = htons(5000);
// 向服务器发送数据
int nServAddLen = sizeof(servAddr);
if(sendto(sockClient,buf,BUF_SIZE,0,(sockaddr *)&servAddr,nServAddLen) == SOCKET_ERROR)
{
printf("recvfrom() failed:%d/n",WSAGetLastError());
closesocket(s);
WSACleanup();
return 1;
}
nRet = recvfrom(sockClient,buf,BUF_SIZE,0,(sockaddr *)&servAddr,&nServAddLen);
if(SOCKET_ERROR == nRet)
{
printf("recvfrom failed !/n");
closesocket(s);
WSACleanup();
return -1;
}
// 打印来自服务端发送来的数据
printf("Recv From Server:%s/n",buf);
closesocket(s);
WSACleanup();
return 0;
}

程序运行效果：

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源代码下载地址：

http://blog.csdn.net/wangningyu/article/details/4560835

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原文地址：http://www.cnblogs.com/findumars/p/5928712.html

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