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Parallel Port access with C#

Posted on 2004-05-01
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Last Modified: 2012-06-27
I'm looking for some help on writing to the parallel port within WinXP Pro using C#.  I'm not sure how this is done and I can't find any substantial resources online.  All I want to do is be able to write a byte, that's it, nothing else.

Thanks
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Question by:ChaveTech
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6 Comments
 
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Expert Comment

by:jjacksn
ID: 10969965
This should do it:

http://www.codeproject.com/csharp/csppleds.asp?df=100&forumid=21021&exp=0&select=799135

In addition, you could always write it in a C++ com and interop to it.
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Author Comment

by:ChaveTech
ID: 10970057
I've been to that site and have tried it, but it's not working.  I don't know if the DLL the author provides is valid.  I don't have a problem writing it in C++, but I'm not familiar with writing in COM.  Do you have any suggestions?
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LVL 5

Expert Comment

by:jjacksn
ID: 10970873
ChaveTech,

With com, all you need to do is create an ATL com object.  Use the template.  Add a method called to the COM interface you create called WriteParallelByte which takes in a byte (as an int).  You can then simply include this in a C# project by adding a reference to the COM object (dll).  .NET Studio will then automatically create an interop dll that will allow you to instantiate this com object and make the call.
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philippe_leybaert earned 500 total points
ID: 11003906
If you just want to write some bytes or text to the parallel port, you can create an output file stream that maps to the parallel port:

The drawback is that you need to call unmanaged code from kernel32.dll

class myClass
{            
   [DllImport("kernel32.dll", CharSet=CharSet.Unicode)]
   private static extern IntPtr CreateFile(
                    string lpFileName,
                    [MarshalAs(UnmanagedType.U4)] uint dwDesiredAccess,
                    [MarshalAs(UnmanagedType.U4)] int dwShareMode,
                    [MarshalAs(UnmanagedType.U4)] uint lpSecurityAttributes,
                    [MarshalAs(UnmanagedType.U4)] int dwCreationAttributes,
                    [MarshalAs(UnmanagedType.U4)] int dwFlagsAndAttributes,
                    IntPtr hTemplateFile
                   );

   public FileStream createLPT1_FS()
   {
      IntPtr h = CreateFile("LPT1",0xC0000000,0,0,3,0,(IntPtr)0);

      return new FileStream(h,FileAccess.ReadWrite);
   }
}
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Expert Comment

by:jjacksn
ID: 11006866
Windows knows how to Map files like this?  I had no idea....
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