Question

Is there a way to send ZPL (Zebra Programming Language) to a printer in .NET?

I have the code to do this in Delphi, but it is not pretty and I would rather not try to recreate it in .NET as it is.

Answer 1

Take a look at this thread: Print ZPL codes to ZEBRA printer using PrintDocument class.

Specifically the OP pick this function from the answers to the thread:

[DllImport("kernel32.dll", SetLastError = true)]
static extern SafeFileHandle CreateFile(string lpFileName, FileAccess dwDesiredAccess,
uint dwShareMode, IntPtr lpSecurityAttributes, FileMode dwCreationDisposition,
uint dwFlagsAndAttributes, IntPtr hTemplateFile);

private void Print()
{
    // Command to be sent to the printer
    string command = "^XA^FO10,10,^AO,30,20^FDFDTesting^FS^FO10,30^BY3^BCN,100,Y,N,N^FDTesting^FS^XZ";

    // Create a buffer with the command
    Byte[] buffer = new byte[command.Length];
    buffer = System.Text.Encoding.ASCII.GetBytes(command);
    // Use the CreateFile external func to connect to the LPT1 port
    SafeFileHandle printer = CreateFile("LPT1:", FileAccess.ReadWrite, 0, IntPtr.Zero, FileMode.Open, 0, IntPtr.Zero);
    // Aqui verifico se a impressora é válida
    if (printer.IsInvalid == true)
    {
        return;
    }

    // Open the filestream to the lpt1 port and send the command
    FileStream lpt1 = new FileStream(printer, FileAccess.ReadWrite);
    lpt1.Write(buffer, 0, buffer.Length);
    // Close the FileStream connection
    lpt1.Close();

}