How to integrate license file into GUI?

Hello, I am developing the GUI for a script. For this I want to have a license time check. For this simple purpose I have created license.m with following function:

function output = license(varargin)

      if now > datenum('2017-01-01') % this code stops working Jan 1, 2017
          h = msgbox('Please update your License','License Expired') ;
          return
      end  
  end

Now I need help in calling this file in my Matlab GUI script. I want to have this check at beginning of the execution.

Answer 1

[Walter Roberson]

If you are using GUIDE then look in the generated code, and put your call to your license check just before the line

% Begin initialization code - DO NOT EDIT

[adi kul]

I am having issues in calling the function. Can you suggest a code?

[Walter Roberson]

function check_license
  if now > datenum('2017-01-01') % this code stops working Jan 1, 2017
    h = msgbox('Please update your License','License Expired') ;
    quit
  end

And to invoke:

check_license;

[Pedro Piñon]

thanks, great job

[zaiani mohamed]

what chek_license contains ?

[Image Analyst]

chek_license contains these lines of code:

  if now > datenum('2017-01-01') % this code stops working Jan 1, 2017
    h = msgbox('Please update your License','License Expired') ;
    quit
  end  

A better way would be this:

% Check that user has the specified Toolbox installed and licensed.
hasLicenseForToolbox = license('test', 'matlab');	% Check for base MATLAB.
% hasLicenseForToolbox = license('test', 'Image_Acquisition_Toolbox');	% Check for Image Acquisition Toolbox.
% hasLicenseForToolbox = license('test', 'Statistics_Toolbox');	% Check for Statistics and Machine Learning Toolbox.
% hasLicenseForToolbox = license('test', 'Signal_Toolbox');	% Check for Signal Processing Toolbox.
% hasLicenseForToolbox = license('test', 'Video_and_Image_Blockset');	% Check for Computer Vision System Toolbox.
% hasLicenseForToolbox = license('test', 'Neural_Network_Toolbox');	% Check for Deep Learning Toolbox.