How can I receive data via TCP/IP in GUI interface?

Hi, I'm working with MATLAB to communicate with other PC which also using MATLAB.

TCP/IP communication is successful. GUI Creation and All the callback function is going well.

But I have a problem.

The GUI is 'event' oriented but the data is continuously sent.

If I don't use GUI, It is ok because I can use while loop.

But, I cannot handle the TCP/IP with GUI callback function.

How can I do both(using GUI and receiving data via TCP/IP) at the same time?

Answer 1

[Walter Roberson]

Set a BytesAvailableFcn callback.

[JangHo Cho]

Do you mean that I should create tcpip object and the callback function BytesAvailableFcn like this?

handles.tcpi = tcpip('192.168.0.22', 30000, 'NetworkRole, 'client');
handles.tcpi.BytesAvailableFcn = @RXDATA;

and

function b = RXDATA(hObject, eventdata, handles)
   a = fread(tcpi,6,'Float64'); 
   b = mean(a);

Then where should I insert the initialization code for tcpip?

[Walter Roberson]

handles.tcpi = tcpip('192.168.0.22', 30000, 'NetworkRole, 'client');
handles.tcpi.BytesAvailableFcn = @RXDATA;
fopen(handles.tcpi);
guidata(hObject, handles);

Add this to the callback you have for your button that means "Yes, Go ahead and connect". If it is intended to connect immediately add it to the *_OpeningFcn for your GUI.

function RXDATA(hObject, eventdata)   %does not receive handles
 a = fread(tcpi,6,'Float64'); 
 b = mean(a);

and now you probably want to do something with b, such as fprintf() it or display it in a graph or log it to disk. A BytesAvailableFcn does not return any value.

[Yogesh]

Hi walter,

Thanks for the information. I am using developing a GUI Based application. where multiple GUIs are used. Both Server and client are GUI based and i need to send receive data between them.

I need to validate the incoming data and again send back to the data to server. what all steps need to be followed?

For receiving information i will use callback function, but for sending the data can i write fwrite in callback function.

Please help!!

[Walter Roberson]

Yes, you can fwrite() or fprintf() to a tcp connection.

Note: there is also the OutputEmptyFcn callback, to allow you determine when to send to the other side without risking overflowing buffers.

[Harsh Sonani]

why we use handles.tcpi?

direct we can't use tcpi only?