There are two ways using C# that I found on the net:

1. Using CreateFile and WriteFile from win32 api:

   [DllImport("kernel32.dll ")]
   private static extern int CreateFile(
       string lpFileName,
       uint dwDesiredAccess,
       int dwShareMode,
       int lpSecurityAttributes,
       int dwCreationDisposition,
       int dwFlagsAndAttributes,
       int hTemplateFile);
   
   [DllImport("kernel32.dll ")]
   privatestaticextern bool WriteFile(
       int hFile,
       byte[] lpBuffer,
       int nNumberOfBytesToWrite,
       ref int lpNumberOfBytesWritten,
       ref   OVERLAPPED lpOverlapped
     );
   iHandle =CreateFile("lpt1 ",0x40000000,0,0,3,0,0);
   
   byte[] mybyte =System.Text.Encoding.Default.GetBytes(Mystring);
   bool b =WriteFile(iHandle, mybyte, mybyte.Length,ref   i,ref   x);

    

   It can transport barcode command and print barcode well, but it can not read the status from the parallel port.

2. Using Inpout32.dll: There are two main functions:

   • short Inp32(short PortAddress)
   • void Out32(short PortAddress, short data)

But the parameter's type is short; how can I transfer print command String at a time?