LV_COLUMN		lColumn;

	lColumn.mask = LVCF_FMT | LVCF_SUBITEM | LVCF_TEXT | LVCF_WIDTH;
	lColumn.fmt = lfmt;
	lColumn.cx = lmaxwidth;
	lColumn.pszText = ltext;
	lColumn.cchTextMax = sizeof (ltext);
	lColumn.iSubItem = lsubitem;

	int colno = m_TraceList.InsertColumn (lcolumn, &lColumn);

	return colno;

}

//////////////////////////////////////////
//										//
//		Update Trace List Display		//
//										//
//////////////////////////////////////////
void CEWDPingDlg::UpdateTrace()
{

	CString				IPAddressMessage;
	CString				TripTimeMessage;
	CString				SeqMessage;
	CString				HostMessage;

	if (PingSocket.rcvSockAddr.sin_addr.s_addr == NULL)
	{
		IPAddressMessage = "***********";
		HostMessage.Format("**** No response (TTL = %ld)", 
							PingSocket.icmpCurSeq);
		TripTimeMessage = "*";
	}
	else
	{

		TripTimeMessage.Format("%ld", 
							   PingSocket.icmpRoundTripTime);
		IPAddressMessage.Format("%s", 
							    inet_ntoa(PingSocket.rcvSockAddr.sin_addr));
		HostMessage.Format("%s", 
						   inet_ntoa(PingSocket.rcvSockAddr.sin_addr));
	}

	SeqMessage.Format ("%ld", 
					   PingSocket.icmpCurSeq);
	DisplayTrace (TripTimeMessage,
				  IPAddressMessage, 
				  HostMessage);
}

//////////////////////////////////////////
//										//
//			Display Trace				//
//										//
//////////////////////////////////////////
void CEWDPingDlg::DisplayTrace(LPCSTR TripTimeMessage, LPCSTR IPAddressMessage, LPCSTR HostMessage)
{
	int				ItemNumber;

	ItemNumber = m_TraceList.GetItemCount();
	if (ItemNumber > 0)
		ItemNumber--;

	SetDisplayImage (ItemNumber, Icon_Blank);
	m_TraceList.SetItemText(ItemNumber, 1, TripTimeMessage);
	m_TraceList.SetItemText(ItemNumber, 2, IPAddressMessage);
	m_TraceList.SetItemText(ItemNumber, 3, HostMessage);

}

//////////////////////////////////////////
//										//
//			Set Display Image			//
//										//
//		Set the selected icon in the	//
//		trace list box and set the		//
//		focus to it.					//
//										//
//////////////////////////////////////////
void CEWDPingDlg::SetDisplayImage(int FocusItem, ImageType FocusImage)
{

	LV_ITEM			TraceItem;

	TraceItem.iItem = FocusItem;
	TraceItem.iSubItem = 0;
	TraceItem.mask = LVIF_IMAGE;
	TraceItem.iImage = FocusImage;
	m_TraceList.SetItem (&TraceItem);

}

//////////////////////////////////////////
//										//
//			Set Trace Focus				//
//										//
//		Set the focus to the TraceList	//
//		item and exit.					//
//										//
//////////////////////////////////////////
void CEWDPingDlg::SetTraceFocus(int FocusItem, int FocusSubItem)
{

	LV_ITEM			TraceItem;

	TraceItem.iItem = FocusItem;
	TraceItem.iSubItem = FocusSubItem;
	TraceItem.mask = LVIF_STATE;
	TraceItem.stateMask = LVIS_FOCUSED | LVIS_SELECTED;
	m_TraceList.SetItem (&TraceItem);

	m_TraceList.EnsureVisible (FocusItem, FALSE);

}

//////////////////////////////////////////
//										//
//			Set Trace Sequence			//
//										//
//	 Output the current sequence number	//
//	set focus, and exit.				//
//										//
//////////////////////////////////////////
void CEWDPingDlg::SetTraceSequence(int Seq, int FocusItem, ImageType FocusImage)
{

	CString				SeqMessage;

	SeqMessage.Format ("%ld", Seq);
	m_TraceList.InsertItem (FocusItem, SeqMessage, FocusImage);
	SetTraceFocus (FocusItem, 0);

}

//////////////////////////////////////////
//										//
//			Display Blank Line			//
//										//
//		Display a blank line and exit.	//
//										//
//////////////////////////////////////////
void CEWDPingDlg::DisplayBlankLine(void)
{
	int			FocusItem;

	FocusItem = m_TraceList.GetItemCount();
	if (FocusItem != 0)
	{
		m_TraceList.InsertItem (FocusItem, " ", Icon_Blank);
		SetTraceFocus (FocusItem, 0);
	}
		
}

//////////////////////////////////////////
//										//
//				Trace Comment			//
//										//
//	Output the comment at the current	//
//	display line, set focus and exit.	//
//										//
//////////////////////////////////////////

//插入TRACE信息
void CEWDPingDlg::TraceComment(CString Comment)
{

	m_TraceList.InsertItem (m_TraceList.GetItemCount(), 
							"", 
							Icon_BlueArrow);
	SetTraceFocus (m_TraceList.GetItemCount()-1,
				   0);
	DisplayTrace ("", "", Comment);

}
//////////////////////////////////////////////////////////////////////////
//																		//
//						REGISTRY LOAD AND SAVE SECTION					//
//																		//
//////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////
//														//
//		Get a raw socket and set message processor		//
//			Return TRUE if Icmp object allocated		//
//														//
//////////////////////////////////////////////////////////

//初始化SOCKET
BOOL CEWDPingDlg::InitSockets()
{

	if (!PingSocket.OpenNewSocket(GetSafeHwnd(),
					              WSA_PING_ASYNC, 
					              FD_READ | FD_WRITE,
					              AF_INET,
					              SOCK_RAW,
					              IPPROTO_ICMP))
	{
		PingSocket.DisplayError ("WSA_PING_ASYNC",
								 "CEWDPingDlg::InitSockets");
		return FALSE;
	}
	return TRUE;
}

//////////////////////////////////////////////////////////
//														//
//		Get Windows Winsock settings from Registry		//
//														//
//////////////////////////////////////////////////////////

BOOL CEWDPingDlg::FetchWinsockSettings()
{
	SysTCPIP	STcpIp;

	if (!STcpIp.WinsockVersion(&wsaData))
	{
		MessageBox ("No valid winsock.dll detected",
					"CEWDPingDlg::OnInitDialog",
					MB_OK|MB_SYSTEMMODAL);
		return FALSE;
	}

	if (!STcpIp.GetLocalHostName (&m_LocalHost))
	{
		gethostname(CurrentHostName, MAXHOSTNAME);
	}
	else
	{
		memcpy (CurrentHostName, m_LocalHost, m_LocalHost.GetLength());
		CurrentHostName[m_LocalHost.GetLength()] = 0;
	}
	m_LocalHost = CurrentHostName;

	if (!STcpIp.GetDomainName(&LocalDomainName))
		LocalDomainName = "";

	m_LocalHost += "." + LocalDomainName;
	memcpy (CurrentHostName, m_LocalHost, m_LocalHost.GetLength());
	CurrentHostName[m_LocalHost.GetLength()] = 0;

	if (!STcpIp.GetNSName (&LocalNameServer))
		LocalNameServer = "";

	m_NameServer = "Name Server: " + LocalNameServer;

	SetDlgItemText (IDC_LocalHost, m_LocalHost);
	SetDlgItemText (IDC_NameServer, m_NameServer);

	LoadRegValues();

	SetDlgItemText (IDC_DEST, HostName);

	return TRUE;

}

//////////////////////////////////////////
//										//
//		Load operating options			//
//										//
//////////////////////////////////////////
BOOL CEWDPingDlg::LoadRegValues(void)
{

	RegKey		hKey;
	DWORD		dwType;

	icmpDataLen = 64;
	memcpy (HostName, CurrentHostName, MAXHOSTNAME);
	PingSocket.icmpPingTimer = 3000;
	PingSocket.icmpMaxHops = 30;

	if (!hKey.GetRegistryValue(HKEY_CURRENT_USER,
							   "SOFTWARE\\EarthWalk Designs\\EWDPing",
							   "BufferSize",
							   &icmpDataLen,
							   &dwType))
	{
		if (!hKey.SetRegistryValue(HKEY_CURRENT_USER,
							   "SOFTWARE\\EarthWalk Designs\\EWDPing",
							   "BufferSize",
							   icmpDataLen,
							   REG_DWORD))
		{
			MessageBox ("Unable to access registry entry for ""BufferSize""", 
						"Registry Access Error", 
						MB_OK|MB_SYSTEMMODAL);
			return FALSE;
		}
	}

	if (!hKey.GetRegistryValue(HKEY_CURRENT_USER,
							   "SOFTWARE\\EarthWalk Designs\\EWDPing",
							   "PingTimeout",
							   &PingSocket.icmpPingTimer,
							   &dwType))
	{
		if (!hKey.SetRegistryValue(HKEY_CURRENT_USER,
							   "SOFTWARE\\EarthWalk Designs\\EWDPing",
							   "PingTimeout",
							   PingSocket.icmpPingTimer,
							   REG_DWORD))
		{
			MessageBox ("Unable to access registry entry for ""PingTimeout""", 
						"Registry Access Error", 
						MB_OK|MB_SYSTEMMODAL);
			return FALSE;
		}
	}

	if (!hKey.GetRegistryValue(HKEY_CURRENT_USER,
							   "SOFTWARE\\EarthWalk Designs\\EWDPing",
							   "MaxHops",
							   &PingSocket.icmpMaxHops,
							   &dwType))
	{
		if (!hKey.SetRegistryValue(HKEY_CURRENT_USER,
							   "SOFTWARE\\EarthWalk Designs\\EWDPing",
							   "MaxHops",
							   PingSocket.icmpMaxHops,
							   REG_DWORD))
		{
			MessageBox ("Unable to access registry entry for ""MaxHops""", 
						"Registry Access Error", 
						MB_OK|MB_SYSTEMMODAL);
			return FALSE;
		}
	}

	if (!hKey.GetRegistryValue(HKEY_CURRENT_USER,
							   "SOFTWARE\\EarthWalk Designs\\EWDPing",
							   "DefaultHost",
							   &DefHost,
							   &dwType))
	{
		DefHost = HostName;
		if (!hKey.SetRegistryValue(HKEY_CURRENT_USER,
							   "SOFTWARE\\EarthWalk Designs\\EWDPing",
							   "DefaultHost",
							   HostName,
							   REG_SZ))
		{
			MessageBox ("Unable to access registry entry for ""DefaultHost""", 
					    "Registry Access Error", 
						MB_OK|MB_SYSTEMMODAL);
			return FALSE;
		}
	}
	memcpy (HostName, DefHost, DefHost.GetLength());
	HostName[DefHost.GetLength()] = 0;

	return TRUE;

} // End LoadRegValues

//////////////////////////////////////////////
//											//
//		Save updated operating options		//
//											//
//////////////////////////////////////////////
void CEWDPingDlg::SaveRegValues()
{

	RegKey		hKey;

	if (!hKey.SetRegistryValue(HKEY_CURRENT_USER,
							   "SOFTWARE\\EarthWalk Designs\\EWDPing",
							   "BufferSize",
							   icmpDataLen,
							   REG_DWORD))
	{
		MessageBox ("Unable to access registry entry for ""BufferSize""", 
					"Registry Access Error", 
					MB_OK|MB_SYSTEMMODAL);
	}

	if (!hKey.SetRegistryValue(HKEY_CURRENT_USER,
							   "SOFTWARE\\EarthWalk Designs\\EWDPing",
							   "PingTimeout",
							   PingSocket.icmpPingTimer,
							   REG_DWORD))
	{
		MessageBox ("Unable to access registry entry for ""PingTimeout""", 
					"Registry Access Error", 
					MB_OK|MB_SYSTEMMODAL);
	}

	if (!hKey.SetRegistryValue(HKEY_CURRENT_USER,
							   "SOFTWARE\\EarthWalk Designs\\EWDPing",
							   "MaxHops",
							   PingSocket.icmpMaxHops,
							   REG_DWORD))
	{
		MessageBox ("Unable to access registry entry for ""MaxHops""", 
					"Registry Access Error", 
					MB_OK|MB_SYSTEMMODAL);
	}

	if (!hKey.SetRegistryValue(HKEY_CURRENT_USER,
							   "SOFTWARE\\EarthWalk Designs\\EWDPing",
							   "DefaultHost",
							   DefHost,
							   REG_SZ))
	{
		MessageBox ("Unable to access registry entry for ""DefaultHost""", 
				    "Registry Access Error", 
					MB_OK|MB_SYSTEMMODAL);
	}

} // End SaveRegValues