VC++深入详解·chapter14·笔记
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1、基于TCP的网络应用程序的编写
服务器端程序:
// tcpserver.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#include <Winsock2.h>
#include <stdio.h>
#pragma comment(lib, "ws2_32.lib ")
void main()
{
WORD wVersionRequested;
WSADATA wsaData;
int err;
wVersionRequested = MAKEWORD(2, 2);
err = WSAStartup(wVersionRequested, &wsaData);
if (err != 0) {
printf("WSAStartup failed with error: %d/n", err);
return 1;
}
if (LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2) {
printf("Could not find a usable version of Winsock.dll/n");
WSACleanup();
return 1;
}
else
printf("The Winsock 2.2 dll was found okay/n");
SOCKET sockSrv=socket(AF_INET,SOCK_STREAM,0);
SOCKADDR_IN addrSrv;
addrSrv.sin_addr.S_un.S_addr=htonl(INADDR_ANY);
addrSrv.sin_family=AF_INET;
addrSrv.sin_port=htons(6000);
bind(sockSrv,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR));
listen(sockSrv,5);
SOCKADDR_IN addrClient;
int len=sizeof(SOCKADDR);
while(1)
{
SOCKET sockConn=accept(sockSrv,(SOCKADDR*)&addrClient,&len);
char sendBuf[100];
sprintf(sendBuf,"Welcome %s to http://www.sunxin.org",
inet_ntoa(addrClient.sin_addr));
send(sockConn,sendBuf,strlen(sendBuf)+1,0);
char recvBuf[100];
recv(sockConn,recvBuf,100,0);
printf("%s/n",recvBuf);
closesocket(sockConn);
}
}
客户端程序:
// tcpclient.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#include <Winsock2.h>
#include <stdio.h>
#pragma comment(lib, "ws2_32.lib ")
void main()
{
WORD wVersionRequested;
WSADATA wsaData;
int err;
wVersionRequested = MAKEWORD(2, 2);
err = WSAStartup(wVersionRequested, &wsaData);
if (err != 0) {
printf("WSAStartup failed with error: %d/n", err);
return 1;
}
if (LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2) {
printf("Could not find a usable version of Winsock.dll/n");
WSACleanup();
return 1;
}
else
printf("The Winsock 2.2 dll was found okay/n");
SOCKET sockClient=socket(AF_INET,SOCK_STREAM,0);
SOCKADDR_IN addrSrv;
addrSrv.sin_addr.S_un.S_addr=inet_addr("127.0.0.1");
addrSrv.sin_family=AF_INET;
addrSrv.sin_port=htons(6000);
connect(sockClient,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR));
char recvBuf[100];
recv(sockClient,recvBuf,100,0);
printf("%s/n",recvBuf);
send(sockClient,"This is lisi",strlen("This is lisi")+1,0);
closesocket(sockClient);
WSACleanup();
}
注:把服务器端的int len=sizeof(SOCKADDR);写成了int len=sizeof(SOCKET);而造成了无法理解的运行结果
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