socket编程中connect()函数链接问题
发布网友
发布时间：2022-04-20 08:11
共2个回答
热心网友
时间：2023-08-08 05:10
直接用就好了嘛~~
1.简单服务器
//#include <winsock2.h>
//#pragma comment(lib,"WS2_32.lib")
WSADATA wsd;
static UINT port=%%1;
UINT Listen(LPVOID pParam)
{
SOCKET sServer,sClient;
char buf[1024];
int retVal;
if(WSAStartup(MAKEWORD(2,2),&wsd)!=0)
{
return -1;//失败
}
sServer=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
if(INVALID_SOCKET==sServer)
{
WSACleanup();
return -1;//创建套接字失败
}
SOCKADDR_IN addrServ;
addrServ.sin_family=AF_INET;
addrServ.sin_port=htons((short)pParam);
addrServ.sin_addr.s_addr=INADDR_ANY;
retVal=bind(sServer,(LPSOCKADDR)&addrServ,sizeof(SOCKADDR_IN));
if(SOCKET_ERROR==retVal)
{
closesocket(sServer);
WSACleanup();
return -1;//绑定套接字失败
}
retVal=listen(sServer,1);
if(SOCKET_ERROR==retVal)
{
closesocket(sServer);
WSACleanup();
return -1;//开始监听失败
}
sockaddr_in addrClient;
int addrClientlen=sizeof(addrClient);
sClient=accept(sServer,(sockaddr FAR*)&addrClient,&addrClientlen);
if(INVALID_SOCKET==sClient)
{
closesocket(sServer);
WSACleanup();
return -1;//开始接受客户端连接失败
}
ZeroMemory(buf,sizeof(buf));
retVal=recv(sClient,buf,sizeof(buf),0);
if(SOCKET_ERROR==retVal)
{
closesocket(sServer);
closesocket(sClient);
WSACleanup();
return -1;//接收数据失败
}
CString %%2(buf);
closesocket(sServer);
closesocket(sClient);
WSACleanup();
return 0;
}
CWinThread *pThread=AfxBeginThread(Listen,&port);
2.简单客户端
//#include <winsock2.h>
//#pragma comment(lib,"WS2_32.lib")
WSADATA wsd;
SOCKET sHost;
SOCKADDR_IN servAddr;
char buf[1024];
int retVal;
if(WSAStartup(MAKEWORD(2,2),&wsd)!=0)
{
return -1;//失败
}
sHost=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
if(INVALID_SOCKET==sHost)
{
WSACleanup();
return -1;//创建套接字失败
}
servAddr.sin_family=AF_INET;
servAddr.sin_addr.s_addr=inet_addr(%%3);
servAddr.sin_port=htons((short)%%2);
int nServAddlen=sizeof(servAddr);
retVal=connect(sHost,(LPSOCKADDR)&servAddr,sizeof(servAddr));
if(SOCKET_ERROR==retVal) {
closesocket(sHost);
WSACleanup();
return -1;//连接服务器失败
}
ZeroMemory(buf,sizeof(buf));
strcpy(buf,%%3);
retVal=send(sHost,buf,sizeof(buf),0);
if(SOCKET_ERROR==retVal)
{
closesocket(sHost);
WSACleanup();
return -1;//向服务器发送数据失败
}
closesocket(sHost);
WSACleanup();
3.获得本机IP
//#include <winsock2.h>
//#pragma comment(lib,"WS2_32.lib")
WSADATA wsd;
if(WSAStartup(MAKEWORD(2,2),&wsd)!=0)
{
return -1;//失败
}
char szHostname[100],szHostaddress[200];
if(gethostname(szHostname,sizeof(szHostname))!=SOCKET_ERROR)
{
HOSTENT *pHostEnt=gethostbyname(szHostname);
if(pHostEnt!=NULL){
sprintf(szHostaddress,"%d.%d.%d.%d",
( pHostEnt->h_addr_list[0][0]&0x00ff ),
( pHostEnt->h_addr_list[0][1]&0x00ff ),
( pHostEnt->h_addr_list[0][2]&0x00ff ),
( pHostEnt->h_addr_list[0][3]&0x00ff ));
}
}
else
return;
CString %%1(szHostaddress);
5.点对点通信
//#include <winsock2.h>
//#pragma comment(lib,"WS2_32.lib")
WSADATA wsd;
SOCKADDR_IN addrServ,addrServ2;
SOCKET sServer,sClient,sHost;
int retVal;
sockaddr_in addrClient;
char buf[1024];
static UINT port=%%2;
BOOL listenerRun=TRUE;
UINT Listen(LPVOID pParam)
{
addrServ.sin_family=AF_INET;
addrServ.sin_port=htons((UINT)pParam);
addrServ.sin_addr.s_addr=INADDR_ANY;
retVal=bind(sServer,(LPSOCKADDR)&addrServ,sizeof(SOCKADDR_IN));
if(SOCKET_ERROR==retVal)
{
closesocket(sServer);
WSACleanup();
return -1;//绑定套接字失败
}
retVal=listen(sServer,1);
if(SOCKET_ERROR==retVal)
{
closesocket(sServer);
WSACleanup();
return -1;//开始监听失败
}
int addrClientlen=sizeof(addrClient);
sClient=accept(sServer,(sockaddr FAR*)&addrClient,&addClientlen);
if(INVALID_SOCKET==sClient)
{
closesocket(sServer);
WSACleanup();
return -1;//接收客户端请求失败
}
while(listenerRun)
{
ZeroMemory(buf,sizeof(buf));
retVal=recv(sClient,buf,sizeof(buf));
if(SOCKET_ERROR==retVal)
{
closesocket(sServer);
closesocket(sClient);
WSACleanup();
return -1;//接收客户端数据失败
}
CString %%4(buf);
}
}
if(WSAStartup(MAKEWORD(2,2),&wsd)!=0)
{
return -1;//失败
}
sServer=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
if(INVALID_SOCKET==sServer)
{
WSACleanup();
return -1;//创建套接字失败
}
CWinThread *pThread=AfxBeginThread(Listen,&port);
sHost=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
if(INVALID_SOCKET==sHost)
{
WSACleanup();
return -1;//创建套接字失败
}
servAddr2.sin_family=AF_INET;
servAddr2.sin_addr.s_addr=inet_addr(%%1);
servAddr.sin_port=htons((short)%%3);
int nServerAddrlen=sizeof(servAddr2);
retVal=connect(sHost,(LPSOCKADDR)&servAddr2,sizeof(servAddr2));
if(SOCKET_ERROR==retVal)
{
closesocket(sHost);
WSACleanup();
return -1;//连接失败
}
zeroMemory(buf,sizeof(buf));
strcpy(buf,%%5);
retVal=send(sHost,buf,sizeof(buf),0);
if(SOCKET_ERROR==retVal)
{
closesocket(sHost);
WSACleanup();
return -1;//向发送数据失败
}
listenerRun=FALSE;
DWORD dwExitCode;
::GetExitCodeThread(pThread->m_hThread,&dwExitCode);
pThread=null;
closesocket(sServer);
closesocket(sClient);
closesocket(sHost);
WSACleanup();
热心网友
时间：2023-08-08 05:10
首先你要弄清为啥要用非阻塞的connect:
1、可以在连接建立的同时处理其他的事情。
2、采用这种技术可以同时建立多个连接。
3、建立连接的超时时间可以由我们自己控制。
如果连接成功，套接口可写，如果失败则既可读有可写。通常采用的方法是在处理完其他的事情或超时到达时去判断该套接口的读写状态。
