Get IP address over a Edit box

Hi all,

I need to get a IP address kind of values from the edit box.i.e, I have to get like 10 values from one edit box. I've planned to give an edit box like image shown below,

How to do this in edit box . I remember seeing this in some undocumented matlab using combo boxes but i can't recall it.

Answer 1

[Yair Altman]

Matlab comes with a built-in IP component, com.jidesoft.field.IPTextField, which is part of the JIDE library of components. You can use it as follows:

jIPField = com.jidesoft.field.IPTextField('255.255.255.0');  % set default IP
[jIPField, hContainer] = javacomponent(jIPField, [10,10,120,20], hParent);  % hParent: panel/figure handle

You can modify the position/size of the text-field in the javacomponent call above, or by modifying the Position / Units properties of hContainer.

You can retrieve the IP text/numeric values using:

vals = jIPField.getValue';         % 1x4 uint32 array => [255,255,255,0]
vals = cell(jIPField.getRawText)'; % 1x4 string cells => {'255','255','255','0'} 
ip   = char(jIPField.getText);     % entire IP string => '255.255.255.0'

The component auto-validates the IP values, ensuring that the displayed IP is always valid. The component has many other features, including the ability to enable/disable, color or format the IP components etc.

You can set a callback function to process user changes, by setting the component's StateChangedCallback property, for example:

jIPField.StateChangedCallback = @(jComponent,jEventData) disp(jComponent.getValue');

The JIDE libraries that come with Matlab contain numerous other similarly-useful components, including date/time selectors, credit-card fields, etc. etc.

For more information about using the javacomponent function and handling Java components in Matlab GUI, see my website or book (" Undocumented Secrets of Matlab-Java Programming ", CRC Press 2014)

Yair Altman

http://UndocumentedMatlab.com

[Jan]

+1. Yair, do you read all questions in the forum and post such perfect answers if they belong to the Java treasure? Or do you let a robot scan the forum for the term "undocumented"? I thought about this in the times of CSSM already. Sometimes I simply added "This is a question for Yair" in my answers to catch your attraction, and you posted an answer an hour later. Very attentive. Thanks.

[Yair Altman]

Hi Jan - I do indeed have keyword scans in place, and that's how I got here. In the good ol' days of CSSM (RIP), traffic was lower, I had more spare time, and I also got a daily digest of all new threads, so I could quickly review everything. But nowadays I no longer have time to review all the new posts, and I no longer get a digest, so I just use keyword filters (which obviously ignores many potentially interesting posts).

Bottom line: if you want to get my attention, then writing the words "Yair" or "undocumented" will have a good chance of doing this...

Answer 2

[Jan]

You can use a standard edit box and perform the checks in the callback, e.g.:

function EditCallback(hObject, EventData, handles)
Str      = get(hObject, 'String');
[Num, N] = sscanf(Str, '%d.%d.%d.%d');
if N == 4 && && all(Num > 0) && all(Num < 256)
  Str = sprintf('%03d.%03d.%03d.%03d', Num);   % Or: '%d.%d.%d.%d' if you like it
  set(hObject, 'String', Str, 'Color', [0,0,0]);
  handles.IP = Str;
  guidata(hObject, handles);
else  % Warn the user, that this is no valid IP:
  set(hObject, 'Color', [1,0,0]);    
end
end

Answer 3

[Image Analyst]

A related answer, if you want to get the IP address of your own computer, you can do this (if you're using a Windows system):

[status, commandOutput] = system('ipconfig')
str = 'IPv4 Address. . . . . . . . . . . : ';
% Extract ip addresses.  There will be one for each network adapter, e.g. wired, wireless, etc.
index = strfind(commandOutput, str);
startingIndex = index + length(str)
for k = 1 : length(startingIndex)
	s = commandOutput(startingIndex(k):startingIndex(k)+15);
	% Get rid of any trailing non-numeric characters
	while isnan(str2double(s(end))) && length(s) > 1
		s = s(1 : end-1);
	end
	ipAddress{k} = s;
	fprintf('IP Address #%d = %s\n', k, s);
end