C# LPT inpout32.dll

问题:

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.

回答1:

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.

回答2:

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);             }         }     } } 

回答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.

回答4:

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).

文章来源: C# LPT inpout32.dll