-
网络编程中的socket技术
资源介绍
一个简单的socket网络编程例子：
服务器代码：
#include
#include
#include
#include
#pragma comment(lib,"ws2_32.lib") //这句话的意思是加载ws2_32.lib这个静态库
#define NETWORK_EVENT WM_USER+100
//如果你用mfc做开发，你可以点击菜单project-〉setting-〉link-〉object/library中添加这个静态库。
//如果你用c语言，你需要通过#pragma comment（命令来连接静态库
int main(int argc, char* argv[]){
HANDLE hThread = NULL;
//判断是否输入了端口号
if(argc!=3){
printf("Usage: %sPortNumber\n",argv[1]);
exit(-1);
}
//把端口号转化成整数
short port;
if((port = atoi(argv[2]))==0){
printf("端口号有误！");
exit(-1);
}
WSADATA wsa;
//初始化套接字DLL
if(WSAStartup(MAKEWORD(2,2),&wsa)!=0){ //高字节指定了次版本号，低字节指定了主版本号，两个字节加到一起，就是你想要的Winsock库的版本号了
printf("套接字初始化失败!");
exit(-1);
}
//创建套接字
SOCKET serverSocket;
if((serverSocket=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP))==INVALID_SOCKET){
printf("创建套接字失败！");
exit(-1);
}
struct sockaddr_in serverAddress;
memset(&serverAddress,0,sizeof(sockaddr_in));
serverAddress.sin_family=AF_INET;
serverAddress.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
serverAddress.sin_port = htons(port);
//绑定
if(bind(serverSocket,(sockaddr*)&serverAddress,sizeof(serverAddress))==SOCKET_ERROR){
printf("套接字绑定到端口失败！端口: %d\n",port);
exit(-1);
}
//进入侦听状态
if(listen(serverSocket,SOMAXCONN)==SOCKET_ERROR){
printf("侦听失败！");
exit(-1);
}
printf("Server %d is listening......\n",port);
SOCKET clientSocket[5],maxSocket;//用来和客户端通信的套接字
struct sockaddr_in clientAddress;//用来和客户端通信的套接字地址
memset(&clientAddress,0,sizeof(clientAddress));
int addrlen = sizeof(clientAddress);
fd_set fd_read;
int i=0;
int j;
char buf[4096];
char buff[4096]="exit";
while(1)
{
FD_ZERO(&fd_read);
maxSocket=serverSocket;
FD_SET(serverSocket,&fd_read);
//FD_SET(clientSocket[i-1],&fd_read);
for(j=0;j");
//gets(buff);
if(select(maxSocket+1,&fd_read,NULL,NULL,NULL)>0)
{
if(FD_ISSET(serverSocket,&fd_read))
{
if(buff=="")
{
if((clientSocket[i++]=accept(serverSocket,(sockaddr*)&clientAddress,&addrlen))==INVALID_SOCKET)
{
printf("接受客户端连接失败！");
exit(-1);
}
else
{
for(j=0;j5)
{
printf("超过最大客户端数");
exit(-1);
}
}
else
{
int bytes;
for(int k=0;k0)
{
buf[bytes]='\0';
printf("Message from %s: %s\n",inet_ntoa(clientAddress.sin_addr),buf);
if(send(clientSocket[k],buf,bytes,0)==SOCKET_ERROR)
{
printf("发送数据失败！");
exit(-1);
}
}
}
}
}
}
}
//清理套接字占用的资源
WSACleanup();
return 0;
}
客户端代码：
#include
#include
#include
#pragma comment(lib,"ws2_32.lib")
int main(int argc, char* argv[]){
//判断是否输入了IP地址和端口号
if(argc!=4){
printf("Usage: %s IPAddress PortNumber\n",argv[1]);
exit(-1);
}
//把字符串的IP地址转化为u_long
unsigned long ip;
if((ip=inet_addr(argv[2]))==INADDR_NONE){
printf("不合法的IP地址：%s",argv[1]);
exit(-1);
}
//把端口号转化成整数
short port;
if((port = atoi(argv[3]))==0){
printf("端口号有误！");
exit(-1);
}
printf("Connecting to %s:%d......\n",inet_ntoa(*(in_addr*)&ip),port);
WSADATA wsa;
//初始化套接字DLL
if(WSAStartup(MAKEWORD(2,2),&wsa)!=0){
printf("套接字初始化失败!");
exit(-1);
}
//创建套接字
SOCKET sock,serverSocket;
if((sock=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP))==INVALID_SOCKET){
printf("创建套接字失败！");
exit(-1);
}
struct sockaddr_in serverAddress;
memset(&serverAddress,0,sizeof(sockaddr_in));
serverAddress.sin_family=AF_INET;
serverAddress.sin_addr.S_un.S_addr = ip;
serverAddress.sin_port = htons(port);
//建立和服务器的连接
if(connect(sock,(sockaddr*)&serverAddress,sizeof(serverAddress))==SOCKET_ERROR)
{
printf("建立连接失败！");
exit(-1);
}
char buf[4096];
while(1){
printf(">");
//从控制台读取一行数据
gets(buf);
if(send(sock,buf,strlen(buf),0)==SOCKET_ERROR){
printf("发送c数据失败！");
exit(-1);
}
int bytes;
if((bytes=recv(sock,buf,sizeof(buf),0))==SOCKET_ERROR)
{
printf("接收c数据失败!\n");
exit(-1);
}
else
{
buf[bytes]='\0';
printf("Message from %s: %s\n",inet_ntoa(serverAddress.sin_addr),buf);
}
}
//清理套接字占用的资源
WSACleanup();
return 0;
}
- 上一篇: socket实现的网络传输图片
- 下一篇: Socket 编程实例