1.libsocketԴ??
2.CSocketä¹UDPç¼ç¨
3.求聊天系统中客户端通信C/C++源代码!!!
4.libevent、libev框架介绍
libsocketԴ??
源代码奉上,流程图。43的源码两个字节。。这个太简单了,你自己看看。。。。。。java gui程序源码。
//TCP
//服务器端程序
#include< stdio.h >
#include< stdlib.h >
#include< windows.h >
#include< winsock.h >
#include< string.h >
#pragma comment( lib, "ws2_.lib" )
#define PORT
#define BACKLOG
#define TRUE 1
void main( void )
{
int iServerSock;
int iClientSock;
char *buf = "hello, world!\n";
struct sockaddr_in ServerAddr;
struct sockaddr_in ClientAddr;
int sin_size;
WSADATA WSAData;
if( WSAStartup( MAKEWORD( 1, 1 ), &WSAData ) )//初始化
{
printf( "initializationing error!\n" );
WSACleanup( );
exit( 0 );
}
if( ( iServerSock = socket( AF_INET, SOCK_STREAM, 0 ) ) == INVALID_SOCKET )
{
printf( "创建套接字失败!\n" );
WSACleanup( );
exit( 0 );
}
ServerAddr.sin_family = AF_INET;
ServerAddr.sin_port = htons( PORT );//监视的端口号
ServerAddr.sin_addr.s_addr = INADDR_ANY;//本地IP
memset( & ( ServerAddr.sin_zero ), 0, sizeof( ServerAddr.sin_zero ) );
if( bind( iServerSock, ( struct sockaddr * )&ServerAddr, sizeof( struct sockaddr ) ) == -1 )
{
printf( "bind调用失败!\n" );
WSACleanup( );
exit( 0 );
}
if( listen( iServerSock, BACKLOG ) == -1 )
{
printf( "listen调用失败!\n" );
WSACleanup( );
exit( 0 );
}
while( TRUE )
{
sin_size = sizeof( struct sockaddr_in );
iClientSock = accept( iServerSock, ( struct sockaddr * )&ClientAddr, &sin_size );
if( iClientSock == -1 )
{
printf( "accept调用失败!\n" );
WSACleanup( );
exit( 0 );
}
printf( "服务器连接到%s\n", inet_ntoa( ClientAddr.sin_addr ) );
if( send( iClientSock, buf, strlen( buf ), 0 ) == -1 )
{
printf( "send调用失败!" );
closesocket( iClientSock );
WSACleanup( );
exit( 0 );
}
}
}
/////客户端程序
#include< stdio.h >
#include< stdlib.h >
#include< windows.h >
#include< winsock.h >
#include< string.h >
#pragma comment( lib, "ws2_.lib" )
#define PORT
#define BACKLOG
#define TRUE 1
#define MAXDATASIZE
void main( void )
{
int iClientSock;
char buf[ MAXDATASIZE ];
struct sockaddr_in ServerAddr;
int numbytes;
// struct hostent *he;
WSADATA WSAData;
// int sin_size;
/* if( ( he = gethostbyname( "liuys" ) ) == NULL )
{
printf( "gethostbyname调用失败!" );
WSACleanup( );
exit( 0 );
}
*/
if( WSAStartup( MAKEWORD( 1, 1 ), &WSAData ) )//初始化
{
printf( "initializationing error!\n" );
WSACleanup( );
exit( 0 );
}
if( ( iClientSock = socket( AF_INET, SOCK_STREAM, 0 ) ) == INVALID_SOCKET )
{
printf( "创建套接字失败!\n" );
WSACleanup( );
exit( 0 );
}
ServerAddr.sin_family = AF_INET;
ServerAddr.sin_port = htons( PORT );
// ServerAddr.sin_addr = *( ( struct in_addr * )he->h_addr );
ServerAddr.sin_addr.s_addr = inet_addr( "..2." );//记得换IP
memset( &( ServerAddr.sin_zero ), 0, sizeof( ServerAddr.sin_zero ) );
if( connect( iClientSock, ( struct sockaddr * ) & ServerAddr, sizeof( struct sockaddr ) ) == -1 )
{
printf( "connect失败!" );
WSACleanup( );
exit( 0 );
}
numbytes = recv( iClientSock, buf, MAXDATASIZE, 0 );
if( numbytes == -1 )
{
printf( "recv失败!" );
WSACleanup( );
exit( 0 );
}
buf[ numbytes ] = '\0';
printf( "Received: %s", buf );
closesocket( iClientSock );
WSACleanup( );
}
/////UDP
//服务器
#include< stdio.h >
#include< string.h >
#include< winsock.h >
#include< windows.h >
#pragma comment( lib, "ws2_.lib" )
#define PORT
#define BACKLOG
#define TRUE 1
#define MAXDATASIZE
void main( void )
{
int iServerSock;
// int iClientSock;
int addr_len;
int numbytes;
char buf[ MAXDATASIZE ];
struct sockaddr_in ServerAddr;
struct sockaddr_in ClientAddr;
WSADATA WSAData;
if( WSAStartup( MAKEWORD( 1, 1 ), &WSAData ) )
{
printf( "initializationing error!\n" );
WSACleanup( );
exit( 0 );
}
iServerSock = socket( AF_INET, SOCK_DGRAM, 0 );
if( iServerSock == INVALID_SOCKET )
{
printf( "创建套接字失败!\n" );
WSACleanup( );
exit( 0 );
}
ServerAddr.sin_family = AF_INET;
ServerAddr.sin_port = htons( PORT );//监视的端口号
ServerAddr.sin_addr.s_addr = INADDR_ANY;//本地IP
memset( & ( ServerAddr.sin_zero ), 0, sizeof( ServerAddr.sin_zero ) );
if( bind( iServerSock, ( struct sockaddr * )&ServerAddr, sizeof( struct sockaddr ) ) == -1 )
{
printf( "bind调用失败!\n" );
WSACleanup( );
exit( 0 );
}
addr_len = sizeof( struct sockaddr );
numbytes = recvfrom( iServerSock, buf, MAXDATASIZE, 0, ( struct sockaddr * ) & ClientAddr, &addr_len );
if( numbytes == -1 )
{
printf( "recvfrom调用失败!\n" );
WSACleanup( );
exit( 0 );
}
printf( "got packet from %s\n", inet_ntoa( ClientAddr.sin_addr ) );
printf( "packet is %d bytes long\n", numbytes );
buf[ numbytes ] = '\0';
printf( "packet contains \"%s\"\n", buf );
closesocket( iServerSock );
WSACleanup( );
}
//客户端
#include< stdio.h >
#include< stdlib.h >
#include< windows.h >
#include< winsock.h >
#include< string.h >
#pragma comment( lib, "ws2_.lib" )
#define PORT
#define MAXDATASIZE
void main( void )
{
int iClientSock;
struct sockaddr_in ServerAddr;
int numbytes;
char buf[ MAXDATASIZE ] = { 0 };
WSADATA WSAData;
if( WSAStartup( MAKEWORD( 1, 1 ), &WSAData ) )
{
printf( "initializationing error!\n" );
WSACleanup( );
exit( 0 );
}
if( ( iClientSock = socket( AF_INET, SOCK_DGRAM, 0 ) ) == -1 )
{
printf( "创建套接字失败!\n" );
WSACleanup( );
exit( 0 );
}
ServerAddr.sin_family = AF_INET;
ServerAddr.sin_port = htons( PORT );
ServerAddr.sin_addr.s_addr = inet_addr( "..2." );//记得换IP
memset( &( ServerAddr.sin_zero ), 0, sizeof( ServerAddr.sin_zero ) );
numbytes = sendto( iClientSock, buf, strlen( buf ), 0, ( struct sockaddr * ) & ServerAddr, sizeof( struct sockaddr ) );
if( numbytes == -1 )
{
printf( "sendto调用失败!\n" );
WSACleanup( );
exit( 0 );
}
printf( "sent %d bytes to %s\n", numbytes, inet_ntoa( ServerAddr.sin_addr ) );
closesocket( iClientSock );
WSACleanup( );
}
CSocketä¹UDPç¼ç¨
#include <stdio.h>
#include <Winsock2.h>
#pragma comment(lib,"ws2_.lib")
void main()
{
WORD wVersionRequested;
WSADATA wsaData;
int err;
wVersionRequested = MAKEWORD( 1, 1);
err = WSAStartup( wVersionRequested, &wsaData );
if ( err != 0 )
{
return;
}
if ( LOBYTE( wsaData.wVersion ) != 1 ||
HIBYTE( wsaData.wVersion ) != 1 )
{
WSACleanup( );
return;
}
SOCKET sersocket=socket(AF_INET,SOCK_DGRAM,0);
SOCKADDR_IN seraddr;
seraddr.sin_addr.S_un.S_addr=htonl(INADDR_ANY);
seraddr.sin_family=AF_INET;
seraddr.sin_port=htons();
bind(sersocket,(SOCKADDR*)&seraddr,sizeof(SOCKADDR));
SOCKADDR clientaddr;
int len=sizeof(SOCKADDR);
char revbuf[];
char sendbuf[];
recvfrom(sersocket,revbuf,,0,(SOCKADDR*)&clientaddr,&len);
printf("%s\n",revbuf);
scanf("%s",&sendbuf);
sendto(sersocket,sendbuf,strlen(sendbuf)+1,0,(SOCKADDR*)&clientaddr,len);
closesocket(sersocket);
WSACleanup();
}
#include <stdio.h>
#include <Winsock2.h>
#pragma comment(lib,"ws2_.lib")
void main()
{
WORD wVersionRequested;
WSADATA wsaData;
int err;
wVersionRequested = MAKEWORD( 1, 1);
err = WSAStartup( wVersionRequested, &wsaData );
if ( err != 0 )
{
return;
}
if ( LOBYTE( wsaData.wVersion ) != 1 ||
HIBYTE( wsaData.wVersion ) != 1 )
{
WSACleanup( );
return;
}
SOCKET sockclient=socket(AF_INET,SOCK_DGRAM,0);
SOCKADDR_IN clientaddr;
clientaddr.sin_addr.S_un.S_addr=inet_addr(".0.0.1");
clientaddr.sin_family=AF_INET;
clientaddr.sin_port=htons();
int len=sizeof(SOCKADDR);
char revbuf[];
char sendbuf[];
printf("请è¾å ¥å 容ï¼\n");
while(1)
{
scanf("%s",&sendbuf);
sendto(sockclient,sendbuf,strlen(sendbuf)+1,0,(SOCKADDR*)&clientaddr,len);
recvfrom(sockclient,revbuf,,0,(SOCKADDR*)&clientaddr,&len);
printf("%s\n",revbuf);
}
closesocket(sockclient);
WSACleanup();
}
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求聊天系统中客户端通信C/C++源代码!!!
#include "stdafx.h"
#include <Winsock2.h>
#include <windows.h>
#include <stdio.h>
#include <iostream>
#include <string.h>
using namespace std;
#pragma comment (lib,"ws2_.lib")
int _tmain(int argc, _TCHAR* argv[])
{
WORD wVersionRequested;//版本号
WSADATA wsaData;
int err;
wVersionRequested = MAKEWORD( 2, 1 );//1.1版本的套接字
err = WSAStartup( wVersionRequested, &wsaData );
if ( err != 0 ) {
return 0;
}//加载套接字库,加裁失败则返回
if ( LOBYTE( wsaData.wVersion ) != 2 || HIBYTE( wsaData.wVersion ) != 1 ) {
WSACleanup( );
return 0;
}//如果不是1.1的则退出
SOCKET sockClient = socket(AF_INET,SOCK_STREAM,0);//创建socket SOCK_STREAM表示TCP
if (sockClient==INVALID_SOCKET)
{
cout<<"INVALID_SOCKET"<<endl;
}
SOCKADDR_IN addrClient; //设置相关地址结构
cout<<"ip"<<endl;
char ip[]=".0.0.1";
cin>>ip;
addrClient.sin_addr.s_addr=inet_addr(ip);
addrClient.sin_family=AF_INET;
addrClient.sin_port=htons();//设置server端端口号,你可以随便设置
//连接
int x=connect(sockClient,(SOCKADDR*)&addrClient,sizeof(SOCKADDR));
if (x==SOCKET_ERROR)
{
cout<<"连接出错"<<endl;
return 0;
}
while(1)
{
char ddb_send[]="\0";
cin>>ddb_send;
if (strcmp(ddb_send,"exit")==0)
break;
char * buf=ddb_send;
int y=send(sockClient,buf,,0);
if (y==SOCKET_ERROR)
cout<<"SOCKET_ERROR"<<endl;
}
closesocket(sockClient);//关闭
WSACleanup();
return 0;
}
libevent、libev框架介绍
本文深入讲解了libevent的API,并剖析了libevent的evbuffer源码。libevent、libev和libuv都是C语言实现的异步事件库,主要负责注册异步事件、检测异步事件,并根据事件的管理系统 源码 手机触发先后顺序调用相应的回调函数处理事件。这些事件包括网络I/O事件、定时事件以及信号事件,共同驱动服务器运行。
libevent和libev主要封装了与操作系统交互的简单事件管理接口,让开发者无需关注平台差异,只需处理事件的具体逻辑。libev改进了libevent的架构决策,如消除全局变量的使用,采用回调函数传递上下文,构建不同的数据结构以降低事件耦合性,使用最小四叉堆作为计时器,从而实现高效管理。然而,libevent和libev在window平台的小牛oa系统源码支持较差,因此libuv应运而生,基于libev,尤其在window平台上更好地封装了iocp,node.js即基于libuv。
在libevent的编译安装过程中,首先从git下载release-2.1.-stable.tar.gz,然后在编译程序时指定库名:-levent。由于头文件和库文件已经复制至系统路径,因此在编译时无需额外指定-I和-L。
libevent的封装层次分为网络封装和解决的问题。网络封装包括IO检测和IO操作,解决的问题涉及连接建立(如最大连接数、黑白名单等)和连接断开,以及数据的matlab 信道仿真源码到达与发送。如果不想手动操作IO事件,libevent会管理读写I/O处理,使开发者只需处理逻辑,无需关心边界问题。
libevent提供了事件检测与操作的封装。事件检测是低层封装,由libevent负责,用户自定义IO操作。该层次封装了事件管理器操作和事件接口。事件管理器event_base用于构建事件集合,检测事件就绪情况。释放管理器使用event_base_free,event_reinit用于重置,event_get_supported_methods查看支持的方法。
事件循环通过event_base_dispatch和event_base_loop实现,等待事件产生,提供类似epoll红黑树循环的功能。事件循环终止使用event_base_loopbreak和event_base_loopexit,前者在事件回调执行后终止,后者立即终止。
事件对象通过event_new创建,event_free销毁。注册与注销事件使用event_add和event_del,事件驱动的核心思想是libevent的核心功能。
libevent事件对象包括只使用事件检测、IO操作自处理的Demo。此外,自带缓冲的事件-bufferevent介绍其作为event的高级版本,拥有两个缓冲区和三个回调函数,分别用于读取、写入和事件处理。
bufferevent提供读写数据到缓冲区的封装,三个回调函数分别处理读取、写入和事件触发。构建、销毁bufferevent对象,以及连接操作、设置回调等。
事件类型注册与注销使用bufferevent_enable/disable,获取读写缓冲区使用bufferevent_get_input和bufferevent_get_output,数据分割使用evbuffer_readln和固定长度读取使用evbuffer_remove。
对于bufferevent,一个文件描述符对应两个缓冲区和三个回调函数,文件描述符用于与客户端通信,非监听文件描述符。两个缓冲区指读缓冲区和写缓冲区,三个回调分别对应读操作、写操作和事件触发。
链接监听器-evconnlistener封装底层socket通信函数,如socket、bind、listen、accept。创建监听器后,等待新客户端连接,调用用户指定的回调函数。构建监听器使用evconnlistener_new_bind,回调函数evconnlistener_cb接收与客户端通信的描述符和连接对端地址。
信号事件在libevent中与网络事件相似,通过epoll监听。定时事件和网络事件的处理机制基于最小堆与epoll_wait,通过源码分析可深入了解流程。
evbuffer作为libevent底层实现的链式缓冲区,用于bufferevent事件中的数据读写。每个evbuffer由链表组成,包含关键成员和实现细节。evbuffer的优点在于高效处理数据移动和内存浪费,缺点是数据在不连续内存中存储,可能导致多次io。libev关注具体网络IO事件、定时事件和信号事件,提供API如ev_io_init、ev_io_start、ev_timer_start和ev_run。通过libev宏定义封装,开发者能使用与libevent类似的接口。
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