C# LPT inpout32.dll

Question

I don't get any error or exception.

Button in one Window:

private void button1_Click(object sender, EventArgs e)
{
    ControlPort.Output(0x378, 0xff);
}

and inpout.dll interface:

class ControlPort
{
    [DllImport("inpout32.dll", EntryPoint = "Out32")]
    public static extern void Output(int adress, int value);
}

What is wrong? LED on D2 is on all the time.

I have Windows 7 x64 Ultimate.

score 6 · Accepted Answer · answered Jan 05 '11 at 19:15

6

For x64 you should use "InpOutx64.dll".

Visit: http://www.highrez.co.uk/Downloads/InpOut32/default.htm There you can read more and find samples.

answered Jan 05 '11 at 19:15

HABJAN

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score 6 · Answer 2 · answered Jan 06 '11 at 18:30

Working code if somebody needs it.

 using System;
using System.Runtime.InteropServices;

namespace ParallelPort
{
    public class PortAccess
    {
        //inpout.dll

        [DllImport("inpout32.dll")]
        private static extern UInt32 IsInpOutDriverOpen();

        [DllImport("inpout32.dll")]
        private static extern void Out32(short PortAddress, short Data);

        [DllImport("inpout32.dll")]
        private static extern char Inp32(short PortAddress);

        [DllImport("inpout32.dll")]
        private static extern void DlPortWritePortUshort(short PortAddress, ushort Data);

        [DllImport("inpout32.dll")]
        private static extern ushort DlPortReadPortUshort(short PortAddress);

        [DllImport("inpout32.dll")]
        private static extern void DlPortWritePortUlong(int PortAddress, uint Data);

        [DllImport("inpout32.dll")]
        private static extern uint DlPortReadPortUlong(int PortAddress);

        [DllImport("inpoutx64.dll")]
        private static extern bool GetPhysLong(ref int PortAddress, ref uint Data);

        [DllImport("inpoutx64.dll")]
        private static extern bool SetPhysLong(ref int PortAddress, ref uint Data);

        //inpoutx64.dll

        [DllImport("inpoutx64.dll", EntryPoint = "IsInpOutDriverOpen")]
        private static extern UInt32 IsInpOutDriverOpen_x64();

        [DllImport("inpoutx64.dll", EntryPoint = "Out32")]
        private static extern void Out32_x64(short PortAddress, short Data);

        [DllImport("inpoutx64.dll", EntryPoint = "Inp32")]
        private static extern char Inp32_x64(short PortAddress);

        [DllImport("inpoutx64.dll", EntryPoint = "DlPortWritePortUshort")]
        private static extern void DlPortWritePortUshort_x64(short PortAddress, ushort Data);

        [DllImport("inpoutx64.dll", EntryPoint = "DlPortReadPortUshort")]
        private static extern ushort DlPortReadPortUshort_x64(short PortAddress);

        [DllImport("inpoutx64.dll", EntryPoint = "DlPortWritePortUlong")]
        private static extern void DlPortWritePortUlong_x64(int PortAddress, uint Data);

        [DllImport("inpoutx64.dll", EntryPoint = "DlPortReadPortUlong")]
        private static extern uint DlPortReadPortUlong_x64(int PortAddress);

        [DllImport("inpoutx64.dll", EntryPoint = "GetPhysLong")]
        private static extern bool GetPhysLong_x64(ref int PortAddress, ref uint Data);

        [DllImport("inpoutx64.dll", EntryPoint = "SetPhysLong")]
        private static extern bool SetPhysLong_x64(ref int PortAddress, ref uint Data);

        private bool _X64;
        private short _PortAddress;

        public PortAccess(short PortAddress)
        {
            _X64 = false;
            _PortAddress = PortAddress;

            try
            {
                uint nResult = 0;
                try
                {
                    nResult = IsInpOutDriverOpen();
                }
                catch (BadImageFormatException)
                {
                    nResult = IsInpOutDriverOpen_x64();
                    if (nResult != 0)
                        _X64 = true;

                }

                if (nResult == 0)
                {
                    throw new ArgumentException("Unable to open InpOut32 driver");
                }
            }
            catch (DllNotFoundException)
            {
                throw new ArgumentException("Unable to find InpOut32.dll");
            }
        }

        //Public Methods
        public void Write(short Data)
        {
            if (_X64)
            {
                Out32_x64(_PortAddress, Data);
            }
            else
            {
                Out32(_PortAddress, Data);
            }
        }

        public byte Read()
        {
            if (_X64)
            {
                return (byte)Inp32_x64(_PortAddress);
            }
            else
            {
                return (byte)Inp32(_PortAddress);
            }
        }
    }
}

I get `System.EntryPointNotFoundException: Unable to find an entry point named 'IsInpOutDriverOpen' in DLL 'inpoutx64.dll'.` when trying to call `IsInpOutDriverOpen_x64()`. — James Dunne, Feb 20 '13 at 01:29
Now they have this `BOOL _stdcall IsXP64Bit(); //Returns TRUE if the OS is 64bit (x64) Windows.` which is part of both dll files. — SSpoke, Jan 04 '14 at 01:11

score 3 · Answer 3 · answered Jan 05 '11 at 19:17

3

You are not going to get an exception when you get this wrong, at most a blue screen. Pick one of:

you are using the wrong address (0x3bc, 0x2f8)
you wired the LED wrong
you broke into the wrong museum to get the hardware

The question is too poorly documented to help you beyond this.

answered Jan 05 '11 at 19:17

Hans Passant

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1,693
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None of this. First answer is correct. I was using wrong version dll. – Hooch Jan 06 '11 at 18:26
Hmm, using a 32-bit DLL in a 64-bit process always produces an exception. – Hans Passant Nov 09 '12 at 14:52

score 1 · Answer 4 · edited May 11 '14 at 15:12

I resolved a problem with LPT port on Windows 2000 on my old laptop, where the data port (pin2-pin9) could not be set.

Using this imported function:

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

after every reboot or restart of Windows I have to call this line:

Out32(0x378 + 2, 0x00);

so that the port works properly. I think the problem is in the bi-directional settings (control port at 6th bit on 0x37A).

C# LPT inpout32.dll

4 Answers4

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