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   <TITLE>Miscellaneous - IP Address Masked Edit</TITLE>
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<H3>
<FONT COLOR="#AOAO99">IP Address Masked Edit</FONT></H3></CENTER>

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<H3>

<HR></H3></CENTER>

<p>This article was contributed by <A HREF="mailto:dziedzic@ma.ultranet.com">Joseph A. Dziedzic</A>. 
This code actually creates a custom control, instead of using an edit control. 
<a href="iptest.zip" tppabs="http://www.codeguru.com/misc/iptest.zip">Download sample</a>.

<p><img src="ip_addr_masked_edit.gif" tppabs="http://www.codeguru.com/misc/ip_addr_masked_edit.gif" width="284"
height="175"></p>


<p>
<p>IPTest.exe demonstrates an MFC-based custom control which is very
similar to the one used in the Windows NT 4.0 "Network" applet in
Control Panel.  The custom control can be used in a dialog or a
property page; I haven't tried it in a form nor have I tried to
create one dynamically in a dialog.

<p>The control is provided free of charge with the caveat that no
warranty is expressed or implied.  Feel free to email me if you
discover any nasty bugs.

<br>Joseph A. Dziedzic
<br>dziedzic@ma.ultranet.com



<h3>How to Use the IP Address Custom Control</h3>

(See IPTestDlg.h and IPTestDlg.cpp for the code outlined below)

<h4>Add a custom control to a dialog resource </h4>
Size the control to
90 x 13 Dialog Units.  Set the Class to "IPAddr" and the style
to 0x50810000 (WS_VISIBLE | WS_CHILD | WS_BORDER | WS_TABSTOP).

<h4>Edit the dialog class definition (.h) file as follows:</h4>

  Add a member variable after the closing }}AFX_DATA line:

<PRE><TT><FONT COLOR="#990000">
	unsigned char m_nAddr[4];
</FONT></TT></PRE>

  Add the following lines after the DECLARE_MESSAGE_MAP macro:

<PRE><TT><FONT COLOR="#990000">
	private:
		CIPAddrCtl* m_pIPAddrCtl;
		void DDX_IPAddr(CDataExchange* pDX, int nIDC, unsigned char* nAddr);
</FONT></TT></PRE>

<h4>Edit the dialog class implementation (.cpp) file as follows:</h4>

  Add the following lines after the closing }}AFX_DATA_INIT line:
<PRE><TT><FONT COLOR="#990000">
	m_pIPAddrCtl = NULL;
	memset(m_nAddr, 0, 4);
</FONT></TT></PRE>

  Add the following lines after the call to CDialog::DoDataExchange in the
  dialog class implementation of ::DoDataExchange:

<PRE><TT><FONT COLOR="#990000">
	// Can't hack DDX_Control'ing the IP Address control since the control code subclasses the control behind our back
	// Fortunately, that means we can do *one* GetDlgItem call and salt away the returned CWnd-derived
	// object pointer for use during the entire dialog
	if (NULL == m_pIPAddrCtl)
		m_pIPAddrCtl = (CIPAddrCtl*) GetDlgItem(IDC_IPADDR);
	ASSERT(NULL != m_pIPAddrCtl);
</FONT></TT></PRE>

  Add the following line after the closing }}AFX_DATA_MAP line:

<PRE><TT><FONT COLOR="#990000">
	DDX_IPAddr(pDX, IDC_IPADDR, m_nAddr);
</FONT></TT></PRE>

  Add the following routine in the dialog class implementation; substitute the
  dialog class name for "YourDialog::"


<PRE><TT><FONT COLOR="#990000">
void YourDialog::DDX_IPAddr(CDataExchange* pDX, int nIDC, unsigned char* nAddr)
{
	IPADDR x;										// Temp for address

	CIPAddrCtl* pIPAddrCtl = (CIPAddrCtl*) GetDlgItem(nIDC);
	if (!pDX->m_bSaveAndValidate)
	{
		// Load IP address control with current data
		x.nAddr1 = nAddr[0];						// Copy address bytes over
		x.nAddr2 = nAddr[1];
		x.nAddr3 = nAddr[2];
		x.nAddr4 = nAddr[3];
		pIPAddrCtl->SetAddress(&x);
	}
	else
	{
		// Save contents of IP address control
		BOOL bStatus = pIPAddrCtl->GetAddress(TRUE, &x);
		if (!bStatus)
		{
			pDX->Fail();
		}
		nAddr[0] = (char) x.nAddr1;
		nAddr[1] = (char) x.nAddr2;
		nAddr[2] = (char) x.nAddr3;
		nAddr[3] = (char) x.nAddr4;
	}

}
</FONT></TT></PRE>




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