C # Backend Call LPT1 port implementation of small ticket machine printing method.

public class Posprinter {const int open_existing = 3;        String prnport = "LPT1";        [DllImport ("kernel32.dll", CharSet = CharSet.Auto)] private static extern IntPtr CreateFile (String lpfilename,        int dwdesiredaccess, int dwsharemode, int lpsecurityattributes, int dwcreationdisposition,        int dwflagsandattributes, int htemplatefile); Public Posprinter () {} public Posprinter (string prnport) {This.prnport = prnport;//Printer Port} public string PrintLine (String str) {IntPtr ihandle = CreateFile (prnpor            T, 0x50000000, 0, 0, open_existing, 0, 0);                if (ihandle.toint32 () = =-1) {Console.WriteLine (ihandle.tostring ());            Return "Not connected to the printer or the printer port is not LPT1";                } else {Console.WriteLine (ihandle.tostring ()); FileStream fs = new FileStream (Ihandle, FIleaccess.readwrite);                StreamWriter SW = new StreamWriter (FS, System.Text.Encoding.Default); Sw.                WriteLine ("Small ticket list"); Sw.                WriteLine (); Sw.                WriteLine (str); Sw.                WriteLine ("Print content"); Sw.                WriteLine ("---------------------------"); Sw.                Close (); Fs.                Close ();            Return "Print succeeded!"; }        }    }

Direct call to PrintLine () method to print the specific required parameters and printing format for everyone to adjust themselves.

C # Backend Call LPT1 port implementation of small ticket machine printing method.