UDP Socket编程 C/C++

//services

#pragma comment (lib,"ws2_32.lib")

#include <Winsock2.h>

#include <stdio.h>

void main()

{

//版本协商

WORD wVersionRequested;

WSADATA wsaData;

int err;

wVersionRequested = MAKEWORD( 1, 1 );

err = WSAStartup( wVersionRequested, &wsaData );

if ( err != 0 ) {

/* Tell the user that we could not find a usable */

/* WinSock DLL. */

return;

}

/* Confirm that the WinSock DLL supports 2.2.*/

/* Note that if the DLL supports versions greater */

/* than 2.2 in addition to 2.2, it will still return */

/* 2.2 in wVersion since that is the version we */

/* requested. */

if ( LOBYTE( wsaData.wVersion ) != 1 ||

HIBYTE( wsaData.wVersion ) != 1) {

/* Tell the user that we could not find a usable */

/* WinSock DLL. */

WSACleanup( );

return;

}

/* The WinSock DLL is acceptable. Proceed. */

//创建数据报套接字

SOCKET svr = socket(AF_INET,SOCK_DGRAM,0);

//创建本地地址信息

SOCKADDR_IN addr;

addr.sin_family = AF_INET;

addr.sin_port = htons(6000);

addr.sin_addr.S_un.S_addr = htonl(INADDR_ANY);

int len = sizeof(sockaddr);

bind(svr,(sockaddr*)&addr,len);

//创建客户端地址对象

SOCKADDR_IN addrClient;

char recvBuf[128];

char sendBuf[128];

char tempBuf[256];

while(true)

{

//接收数据

recvfrom(svr,recvBuf,128,0,(sockaddr*)&addrClient,&len);

char* ipClient = inet_ntoa(addrClient.sin_addr);

sprintf(tempBuf,"%s said: %s\n",ipClient,recvBuf);

printf("%s",tempBuf);

gets(sendBuf);

//发送数据

sendto(svr,sendBuf,strlen(sendBuf)+1,0,(sockaddr*)&addrClient,len);

}

closesocket(svr);

WSACleanup();

}

//client

#pragma comment (lib,"ws2_32.lib")

#include <Winsock2.h>

#include <stdio.h>

void main()

{

//版本协商

WORD wVersionRequested;

WSADATA wsaData;

int err;

wVersionRequested = MAKEWORD( 1, 1 );

err = WSAStartup( wVersionRequested, &wsaData );

if ( err != 0 ) {

/* Tell the user that we could not find a usable */

/* WinSock DLL. */

return;

}

/* Confirm that the WinSock DLL supports 2.2.*/

/* Note that if the DLL supports versions greater */

/* than 2.2 in addition to 2.2, it will still return */

/* 2.2 in wVersion since that is the version we */

/* requested. */

if ( LOBYTE( wsaData.wVersion ) != 1 ||

HIBYTE( wsaData.wVersion ) != 1 ) {

/* Tell the user that we could not find a usable */

/* WinSock DLL. */

WSACleanup( );

return;

}

/* The WinSock DLL is acceptable. Proceed. */

//创建服务器套接字

SOCKET Svr = socket(AF_INET,SOCK_DGRAM,0);

//创建地址

SOCKADDR_IN addrSvr;

addrSvr.sin_family = AF_INET;

addrSvr.sin_port = htons(6000);

addrSvr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");

char recvBuf[128];

char sendBuf[128];

int len = sizeof(sockaddr);

while(true)

{

gets(sendBuf);

//发送数据

sendto(Svr,sendBuf,strlen(sendBuf)+1,0,(sockaddr*)&addrSvr,len);

//接收数据

recvfrom(Svr,recvBuf,128,0,(sockaddr*)&addrSvr,&len);

char* ipSvr = inet_ntoa(addrSvr.sin_addr);

printf("%s said: %s\n",ipSvr,recvBuf);

}

closesocket(Svr);

WSACleanup();

}