Control USB to Parallel Port using C#

Question

How to Control USB to Parallel Port using C#?

USB to Parallel Port: IEEE-1284 (36Pins)

IEEE-1284 Pin Configuration Image:

https://i.stack.imgur.com/b75Z5.png

OS(Operating System): Windows 7 x64

Programming Language: C#

My Code:

private void button1_Click(object sender, EventArgs e)
{
     try
     {
          int address = System.Convert.ToInt16(textBox1.Text);
          int value = System.Convert.ToInt16(textBox2.Text);

          AccessPort.output(address, value);
      }
      catch(Exception ex)
      {
          MessageBox.Show("Error: " + ex.ToString());
      }
}

AccessPort Class:

static class AccessPort
{
    [DllImport("inpout32.dll", EntryPoint = "Out32")]
    public static extern void output(int address, int value);

    [DllImport("inpout32.dll", EntryPoint = "Inp32")]
    public static extern int input(int adress);
}

I have LED(Light Emitting Diode) Connected to D0. When I Set Address to 1 and Value to 1 and Click Button it dont gives Error but LED wont Light UP because inpout32.dll is library for real Parallel Port but I have USB to Parallel Port or My Address and Value is Incorrect for USB to Parallel Port.

How to Light Up LED with USB to Parallel Port(LPT) using C# Programming Language ?

Answer 1

What is wrong there is that the port adress isn't 1. To check the port adress go to device manager, expand ports(COM & LPT), double click the lpt port(parallel port) that you want and go to the tab resources and get this value(see the link below)

https://i.stack.imgur.com/wiTV3.png

then, you must change how you convert the address to a int, because the port address will be in hexadecimal: int address = System.Convert.ToInt16(textBox1.Text, 16);

then in the address textbox just put that value(in my case it's 0378).