Writing Java's pw.println(), etc. in MATLAB

Question

I\'m trying to use the Java commands pw.println() and br.readLine() in MATLAB, because I have set up a socket (input_socket2) between MATLAB and a command-line program I wan

Answer 1

Thanks for all the help! Thinking about things more and reading your comments helped me get to the right answer! Amro, your code is great but I can't implement the Java code because the program I'm trying to communicate with isn't something I've written - it's a program called c-gate and it's a program that can control the Clipsal Square D lighting system. The type of commands it takes are of the form "on 254/56/26" - this turns on the light specified by this path.

So for all those who're curious about how my final code looks like:

function message = client(host, port, number_of_retries)

import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.PrintWriter; import java.net.Socket; import java.net.ServerSocket; import java.net.UnknownHostException; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import java.io.; import java.util.;

if (nargin < 3)
    number_of_retries = -1; % set to -1 for infinite
end

retry        = 0;
input_socket = [];
message      = [];

while true

    retry = retry + 1;
    if ((number_of_retries > 0) && (retry > number_of_retries))
        fprintf(1, 'Too many retries\n');
        break;
    end

    try
        fprintf(1, 'Retry %d connecting to %s:%d\n', ...
                retry, host, port);

        % throws if unable to connect
        input_socket = Socket(host, port);

        % get a buffered data input stream from the socket
        input_stream   = input_socket.getInputStream;
        d_input_stream = DataInputStream(input_stream);

        fprintf(1, 'Connected to server\n');

        % read data from the socket - wait a short time first
        pause(0.5);
        bytes_available = input_stream.available;
        fprintf(1, 'Reading %d bytes\n', bytes_available);

        message = zeros(1, bytes_available, 'uint8');
        for i = 1:bytes_available
            message(i) = d_input_stream.readByte;
        end

        message = char(message);

        % cleanup
        input_socket.close;
        break;

    catch
        if ~isempty(input_socket)
            input_socket.close;
        end

        % pause before retrying
        pause(1);
    end
end

% set up a socket between client and c-gate
host2        = 'localhost';
port2        = 20023;

try
    input_socket2 = Socket(host2,port2);
    input_stream2   = input_socket2.getInputStream;
    d_input_stream2 = DataInputStream(input_stream2);
    br = BufferedReader(InputStreamReader(input_stream2));
    pw = PrintWriter(input_socket2.getOutputStream,true);
    read = readLine(br)
    disp('I read the line')
    pw.println('get 254/56/26 level')
    disp('I entered the command')
    read2 = readLine(br)
end

end

Thanks again!