A C# developer often requires developing an application or a feature in a product that will print the documents. Sometimes we require printing a single line using the printer, this situation may arise when we want to print some status on a pre-printed form. Here is a code which will print the file or print a string using the default printer installed on the machine.
Comments are added to each line of code so as to make it easy to understand !
========================CODE============================
#region Reference
using System;
using System.Drawing.Printing;
using System.Runtime.InteropServices;
using System.Diagnostics;
// Add a reference to the System.Management dll.
using System.Management;
#endregion Reference
namespace PrinterHelper
{
/// <summary>
/// Contains common functions for accessing printer
/// </summary>
public class PrinterHelper
{
#region Member Variables & Method Signatures
// String data to be printed.
static string prnData = string.Empty;
//Add the printer connection for specified pName.
[DllImport("winspool.drv")]
public static extern bool AddPrinterConnection(string pName);
//Set the added printer as default printer.
[DllImport("winspool.drv", CharSet = CharSet.Auto, SetLastError = true)]
public static extern bool SetDefaultPrinter(string Name);
#endregion Member Variables & Method Signatures
#region Public Methods
#region Print File
/// <summary>
/// Sends the file to the printer choosed.
/// </summary>
/// <param name="fileName">Name & path of the file to be printed.</param>
/// <param name="printerPath">The path of printer.</param>
/// <param name="numCopies">The number of copies send to printer.</param>
public bool PrintFile(string fileName, string printerPath, int numCopies)
{
// Check if the incomming strings are null or empty.
if (string.IsNullOrEmpty(fileName) string.IsNullOrEmpty(printerPath))
{
return false;
}
//Instantiate the object of ProcessStartInfo.
Process objProcess = new Process();
try
{
// Set the printer.
AddPrinterConnection(printerPath);
SetDefaultPrinter(printerPath);
//Print the file with number of copies sent.
for (int intCount = 0; intCount < numCopies; intCount++)
{
objProcess.StartInfo.FileName = fileName;
objProcess.StartInfo.Verb = "Print";
objProcess.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
objProcess.StartInfo.UseShellExecute = true;
objProcess.Start();
}
// Return true for success.
return true;
}
catch (Exception ex)
{
// Log the exception and return false as failure.
return false;
}
finally
{
// Close the process.
objProcess.Close();
}
}
#endregion Print File
#region SendStringToPrinter
/// <summary>
/// Sends a string to the printer.
/// </summary>
/// <param name="szString">String to be printed.</param>
/// <returns>Returns true on success, false on failure.</returns>
public bool SendStringToPrinter(string szString)
{
try
{
PrintDocument prnDocument;
string printername;
//Get the default printer name.
prnDocument = new PrintDocument();
printername = Convert.ToString(prnDocument.PrinterSettings.PrinterName);
if (string.IsNullOrEmpty(printername))
throw new Exception("No default printer is set.Printing failed!");
prnData = szString;
prnDocument.PrintPage += new PrintPageEventHandler(prnDoc_PrintPage);
prnDocument.Print();
return true;
}
catch (COMException comException)
{
//Log the exception
return false;
}
catch (Exception sysException)
{
//Log the exception
return false;
}
}
/// <summary>
/// Printes the page.
/// </summary>
/// <param name="sender">object : Sender event</param>
/// <param name="e">PrintPageEventArgs</param>
static void prnDoc_PrintPage(object sender, PrintPageEventArgs e)
{
System.Drawing.Font fnt = new System.Drawing.Font(System.Drawing.FontFamily.GenericSerif, 10);
e.Graphics.DrawString(prnData, fnt, System.Drawing.Brushes.Black, 0, 0);
}
#endregion SendStringToPrinter
#endregion Public Methods
}
}
Your comments are always welcome !
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