MFC TCP 통신 특정 클라이언트에게만 보내기 질문있습니다.

struct UserData {
	int num;
	int iter_info;
	char Ip_Address[16];
	char port[10];
};
std::vector<SOCKET> client_list;
#if 1
#define MAX_CLIENT_NUM 10
#define BUFSIZE 128
#define BUFFER_SIZE 1024
UserData m_user_list[MAX_CLIENT_NUM+1];
 
static UINT ServerFunc(LPVOID pVoid) //TCP
{
 
	while (1)
	{
#if 1
		dlg->client_addr = { 0 };
		dlg->client_addr.sin_family = AF_INET;
		dlg->client_addr.sin_port = htons(ServerPort_Num);
		dlg->client_addr.sin_addr.s_addr = htonl(INADDR_ANY);
 
		int size = sizeof(SOCKADDR_IN);
#endif
		dlg->client_sock = accept(dlg->server_sock, (SOCKADDR*)&dlg->client_addr, &size);
		if (dlg->client_sock == SOCKET_ERROR) 
		{
			AfxMessageBox("accept() Error");
			continue;
		}
 
		client_list.push_back(dlg->client_sock);
		strcpy(m_user_list<ol>
</ol>
.Ip_Address, inet_ntoa(dlg->client_addr.sin_addr));
 
		ConnectInfo_str.Format("IP : %s\n", inet_ntoa(dlg->client_addr.sin_addr));
		ConnectInfo_str2.Format("IP : %s 가 접속했습니다 \n", inet_ntoa(dlg->client_addr.sin_addr));
		dlg->m_ListClient.InsertString(-1, ConnectInfo_str);
		dlg->m_ListChat.InsertString(-1, ConnectInfo_str2);
 
		dlg->m_ListClient.SetItemData(index, dlg->client_sock);
		//dlg->m_ListClient.SetItemData(dlg->m_ListClient.FindString(-1, m_user_list->Ip_Address), dlg->client_sock);
 
		dlg->pThreadTcpServer_Data = AfxBeginThread(ServerRecvSendFunc, (void *)dlg->client_sock);
		index++;
 
	}
	closesocket(dlg->server_sock);
	WSACleanup;
 
	return 0;
 
}

static UINT ServerRecvSendFunc(void *p)
{
	CServerDlg *dlg = (CServerDlg *)AfxGetApp()->m_pMainWnd;
	SOCKET socket = (SOCKET)p;
 
 
	char readbuffer[BUFSIZE + 1];
	int recvsize;
 
 
	while (1)
	{
		recvsize = recv(socket, readbuffer, BUFSIZE, 0);
 
		if (recvsize <= 0)
		{
			break;
		}
		readbuffer[recvsize] = '\0';
 
		CString strMsg2;
		CString strMsg;
 
		strMsg = CString(readbuffer, recvsize);
		dlg->m_ListChat.AddString(strMsg);
		strMsg = "";
#if 1
		//로그위치
#endif
		//로그위치
#if 1
 
			for (int i = 0; i < client_list.size(); i++)
			{
				int sendsize = send(client_list[i], readbuffer, strlen(readbuffer), 0);
			}
 
 
#endif
	}
#if 1
	CString DisConnectInfo_str;
	CString DisConnectInfo_str2;
	//클라이언트가 접속 종료시
	//-------------------------------------------
	for (int i = 0; i < client_list.size(); i++)
	{
		if (client_list[i] == socket)
		{
			//user_ip = m_user_list[i].Ip_Address;
			//AfxMessageBox(user_ip);
 
			DisConnectInfo_str.Format("IP : %s 가 종료했습니다. \n", m_user_list[i].Ip_Address);
			DisConnectInfo_str2.Format("IP : %s\n", m_user_list[i].Ip_Address);
			//DisConnectInfo_str.Format("접속 종료 IP : %s, Port : %d\n", inet_ntoa(dlg->client_addr.sin_addr), dlg->client_addr.sin_port);
 
			dlg->m_ListChat.AddString(DisConnectInfo_str);
 
			dlg->m_ListClient.DeleteString(dlg->m_ListClient.FindString(-1, DisConnectInfo_str2));
 
		}
	}
	//------------------------------------------
 
 
	std::vector<SOCKET>::iterator iter = client_list.begin();
	for (int i = 0; i < client_list.size(); i++)
	{
		if (client_list[i] == socket) //clnt_list[i]의 값이 sock과 같을 때
		{
			client_list.erase(iter); //clnt_list의 첫번째 원소 반복자를 제거
			break;
		}
		iter++;
	}
#endif	
	if (socket == NULL)
	{
	}
	closesocket(socket);
}
#endif

void CServerDlg::OnBnClickedButton2()
{
	// TODO: 여기에 컨트롤 알림 처리기 코드를 추가합니다.
	CServerDlg *dlg = (CServerDlg *)AfxGetApp()->m_pMainWnd;
	CString str2;
 
	//TCP
	for (int i = 0; i < client_list.size(); i++)
	{
		if (m_ListClient.GetItemData((m_ListClient.GetCurSel())) == client_list[i])
		{
			CString str;
			m_edit_chat.GetWindowText(str);
			int sendsize = send(client_list[i], str, strlen(str), 0);
			m_ListChat.AddString(str);
		}
	}
	if(m_ListClient.GetCurSel() ==  CB_ERR)
	{
		m_edit_chat.GetWindowText(str2);
		for (int i = 0; i < client_list.size(); i++)
		{		
			int sendsize = send(client_list[i], str2, strlen(str2), 0);
		}
		m_ListChat.AddString(str2);
	}
 
}