c++多线程编写网络聊天室程序（socket）

先版本信息调用函数

AfxSocketInit

1

BOOL CChatDlg::InitSocket()
{
	m_socket=socket(AF_INET,SOCK_DGRAM,0);
	if(INVALID_SOCKET==m_socket)
	{
		MessageBox("套接字创建失败！");
		return FALSE;
	}
	SOCKADDR_IN addrSock;
	addrSock.sin_family=AF_INET;
	addrSock.sin_port=htons(6000);
	addrSock.sin_addr.S_un.S_addr=htonl(INADDR_ANY);

	int retval;
	retval=bind(m_socket,(SOCKADDR*)&addrSock,sizeof(SOCKADDR));
	if(SOCKET_ERROR==retval)
	{
		closesocket(m_socket);
		MessageBox("绑定失败!");
		return FALSE;
	}
	return TRUE;

}

2，

CreateThread第三个参数接受数据是个指针，写一个结构体，就可以接受好几个参数了

struct RECVPARAM
{
	SOCKET sock;
	HWND hwnd;
};

RECVPARAM *pRecvParam=new RECVPARAM;
	pRecvParam->sock=m_socket;
	pRecvParam->hwnd=m_hWnd;
	HANDLE hThread=CreateThread(NULL,0,RecvProc,(LPVOID)pRecvParam,0,NULL);
	CloseHandle(hThread);

3。面向对象时不使用全局，可以在方法前加static，这样方法不属于对象，只属于类的

static DWORD WINAPI RecvProc(LPVOID lpParameter);

4.接收端数据

DWORD WINAPI CChatDlg::RecvProc(LPVOID lpParameter)
{
	SOCKET sock=((RECVPARAM*)lpParameter)->sock;
	HWND hwnd=((RECVPARAM*)lpParameter)->hwnd;
	delete lpParameter;	//视频讲述时，遗忘了释放内存的操作。sunxin

	SOCKADDR_IN addrFrom;
	int len=sizeof(SOCKADDR);

	char recvBuf[200];
	char tempBuf[300];
	int retval;
	while(TRUE)
	{
		retval=recvfrom(sock,recvBuf,200,0,(SOCKADDR*)&addrFrom,&len);
		if(SOCKET_ERROR==retval)
			break;
		sprintf(tempBuf,"%s说: %s",inet_ntoa(addrFrom.sin_addr),recvBuf);
		::PostMessage(hwnd,WM_RECVDATA,0,(LPARAM)tempBuf);//传给对话框值使用发送消息，自定义消息
	}
	return 0;
}

自定义消息

void CChatDlg::OnRecvData(WPARAM wParam,LPARAM lParam)
{
	CString str=(char*)lParam;
	CString strTemp;
	GetDlgItemText(IDC_EDIT_RECV,strTemp);
	str+="\r\n";
	str+=strTemp;
	SetDlgItemText(IDC_EDIT_RECV,str);
}

5.接收端

void CChatDlg::OnBtnSend() 
{
	// TODO: Add your control notification handler code here
	DWORD dwIP;
	((CIPAddressCtrl*)GetDlgItem(IDC_IPADDRESS1))->GetAddress(dwIP);

	SOCKADDR_IN addrTo;
	addrTo.sin_family=AF_INET;
	addrTo.sin_port=htons(6000);
	addrTo.sin_addr.S_un.S_addr=htonl(dwIP);

	CString strSend;
	GetDlgItemText(IDC_EDIT_SEND,strSend);
	sendto(m_socket,strSend,strSend.GetLength()+1,0,
		(SOCKADDR*)&addrTo,sizeof(SOCKADDR));
	SetDlgItemText(IDC_EDIT_SEND,"");
}