从c＃调用Octave命令的问题

Question

I am trying to use surf function of Octave to plot 3d data from my c# application.

I use Process.Start() to start Octave and Process.WriteLine() to send commands The same method works fine to plot using gnuplot but it's not working with Octave

Process octavePro;
        StreamWriter octaveStWr;
        string octavepath = @"C:\Octave\Octave-5.1.0.0\mingw64\bin\octave-cli-5.1.0.exe";

    private void button1_Click(object sender, EventArgs e)
    {
        octavePro = new Process();
        octavePro.StartInfo.FileName = octavepath;
        octavePro.StartInfo.UseShellExecute = false;
        octavePro.StartInfo.RedirectStandardInput = true;
        octavePro.StartInfo.RedirectStandardOutput = true;
        octavePro.StartInfo.RedirectStandardError = true;
        octavePro.StartInfo.CreateNoWindow = false;
        octavePro.OutputDataReceived += new DataReceivedEventHandler(InterProcOutputHandler);
        octavePro.ErrorDataReceived += new DataReceivedEventHandler(InterProcOutputHandler);

            octavePro.Start();
            octaveStWr = octavePro.StandardInput;
            Thread.Sleep(100);
            octaveStWr.WriteLine("info");
            octaveStWr.WriteLine("surf([1 2 3; 2 3 4; 3 4 5])");
            octaveStWr.Flush();
        }

When I execute the two command "info" and "surf([1 2 3; 2 3 4; 3 4 5])" in Octave-CLI, I get application information and 3d plot for the data respectively. But when I try to execute it from C# application, only a terminal window is started and nothing is displayed in the window.

Answer 1

You may need to increase the sleep time for the initialization of Octave. Depending on the duration of each command you may need add more sleeps. Also use waitfor to suspend the execution of Octave until the figure is closed.

octavePro.Start();
octaveStWr = octavePro.StandardInput;
octavePro.BeginOutputReadLine();
octavePro.BeginErrorReadLine(); 
Thread.Sleep(5000);
octaveStWr.WriteLine("info");
Thread.Sleep(1000);
octaveStWr.WriteLine("waitfor(surf([1 2 3; 2 3 4; 3 4 5]))");