External Interfaces

Simple M-File Example

The following M-file example provides a simple demonstration of programming with Web services. The script takes an array of zip codes and uses the temperature Web service to return the local temperatures. It then runs the max, min, and median functions on the temperatures:

• % Create array with zip codes for Arkansas
  zips = [71854 71901 72201 71601 72143 72904 72701 71971];
  % Create empty array to contain temperature output
  temps = [];
  
  wsdlUrl = 
  'http://www.xmethods.net/sd/2001/TemperatureService.wsdl';
  if ~(exist(wsdlFile,'file') == 2)
      urlwrite(wsdlUrl,wsdlFile);
  end
  
  % Catch errors during class creation 
  try
      % Create class from WSDL
      createClassFromWsdl(wsdlFile);
  catch
      % Throw error
      error('Unable to create WSDL class');
  end
  ts = TemperatureService;
  % Iterate through zips array
  for z = zips
      try
          % Call the getTemp method
          t = getTemp(ts, z);
      catch
          % Throw error
           t = NaN;
          warning(lasterr);
      end
      % Concatenate temperature to temps array
      temps = horzcat(temps, t);
  end
  
  % Display temps array
  disp('Real-Time Temperatures for Arkansas');
  disp(temps);
  % Display highest temperature
  disp('Highest Temperature in Arkansas');
  disp(max(temps));
  % Display lowest temperature
  disp('Lowest Temperature in Arkansas');
  disp(min(temps));
  % Display temps median
  disp('Median Temperature in Arkansas');
  disp(median(temps));
  % Display current date/time
  disp('Date and Time Created:');
  disp(datestr(now));
  

Programming with Web Services

Serial Port I/O

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