How to print a spool file.

[Ertan Zanagar]

I have large number of spool files that I need to send to a printer in my
..net 2 C# code.

I am trying to write a load testing app that can take these spool files and
print them over and over.

What's the best way of doing this print?

Thanks

Ertan Zanagar

 

[Ertan Zanagar]

And this is how you do it...




using System;
using System.Collections.Generic;
using System.IO;
using System.Runtime.InteropServices;
using System.Text;

namespace XXX
{
public class RawPrinterHelper
{
private string documentName = "";
// Structure and API declarions:
[DllImport("winspool.Drv", EntryPoint = "OpenPrinterA", SetLastError
= true, CharSet = CharSet.Ansi,
ExactSpelling = true, CallingConvention =
CallingConvention.StdCall)]
public static extern bool
OpenPrinter([MarshalAs(UnmanagedType.LPStr)] string szPrinter, out IntPtr
hPrinter,
IntPtr pd);
[DllImport("winspool.Drv", EntryPoint = "ClosePrinter", SetLastError
= true, ExactSpelling = true,
CallingConvention = CallingConvention.StdCall)]
public static extern bool ClosePrinter(IntPtr hPrinter);

[DllImport("winspool.Drv", EntryPoint = "StartDocPrinterA",
SetLastError = true, CharSet = CharSet.Ansi,
ExactSpelling = true, CallingConvention =
CallingConvention.StdCall)]
public static extern bool StartDocPrinter(IntPtr hPrinter, Int32
level,
[In,
MarshalAs(UnmanagedType.LPStruct)] DOCINFOA di);

[DllImport("winspool.Drv", EntryPoint = "EndDocPrinter",
SetLastError = true, ExactSpelling = true,
CallingConvention = CallingConvention.StdCall)]
public static extern bool EndDocPrinter(IntPtr hPrinter);

[DllImport("winspool.Drv", EntryPoint = "StartPagePrinter",
SetLastError = true, ExactSpelling = true,
CallingConvention = CallingConvention.StdCall)]
public static extern bool StartPagePrinter(IntPtr hPrinter);

[DllImport("winspool.Drv", EntryPoint = "EndPagePrinter",
SetLastError = true, ExactSpelling = true,
CallingConvention = CallingConvention.StdCall)]
public static extern bool EndPagePrinter(IntPtr hPrinter);

[DllImport("winspool.Drv", EntryPoint = "WritePrinter", SetLastError
= true, ExactSpelling = true,
CallingConvention = CallingConvention.StdCall)]
public static extern bool WritePrinter(IntPtr hPrinter, IntPtr
pBytes, Int32 dwCount, out Int32 dwWritten);

// SendBytesToPrinter()
// When the function is given a printer name and an unmanaged array
// of bytes, the function sends those bytes to the print queue.
// Returns true on success, false on failure.
public bool SendBytesToPrinter(string szPrinterName, IntPtr pBytes,
Int32 dwCount)
{
IntPtr hPrinter;
DOCINFOA di = new DOCINFOA();
bool bSuccess = false; // Assume failure unless you specifically
succeed.

//di.pDocName = "My C#.NET RAW Document";
di.pDataType = string.Format("{0} - {1}",
ACR.LoadTestHarness.Properties.Resources.AppFriendlyName, documentName);

// Open the printer.
if (OpenPrinter(szPrinterName.Normalize(), out hPrinter,
IntPtr.Zero))
{
// Start a document.
if (StartDocPrinter(hPrinter, 1, di))
{
// Start a page.
if (StartPagePrinter(hPrinter))
{
// Write your bytes.
Int32 dwWritten = 0;
bSuccess = WritePrinter(hPrinter, pBytes, dwCount,
out dwWritten);
EndPagePrinter(hPrinter);
}
EndDocPrinter(hPrinter);
}
ClosePrinter(hPrinter);
}
// If you did not succeed, GetLastError may give more
information
// about why not.
if (bSuccess == false)
{
Marshal.GetLastWin32Error();
}
return bSuccess;
}

public bool SendFileToPrinter(string szPrinterName, string
szFileName)
{
// Open the file.
FileStream fs = new FileStream(szFileName, FileMode.Open);
// Create a BinaryReader on the file.
BinaryReader br = new BinaryReader(fs);
// Dim an array of bytes big enough to hold the file's contents.
Byte[] bytes;
bool bSuccess;
// Your unmanaged pointer.
IntPtr pUnmanagedBytes;
int nLength;
documentName = Path.GetFileName(szFileName);
nLength = Convert.ToInt32(fs.Length);
// Read the contents of the file into the array.
bytes = br.ReadBytes(nLength);
// Allocate some unmanaged memory for those bytes.
pUnmanagedBytes = Marshal.AllocCoTaskMem(nLength);
// Copy the managed byte array into the unmanaged array.
Marshal.Copy(bytes, 0, pUnmanagedBytes, nLength);
// Send the unmanaged bytes to the printer.
bSuccess = SendBytesToPrinter(szPrinterName, pUnmanagedBytes,
nLength);
// Free the unmanaged memory that you allocated earlier.
Marshal.FreeCoTaskMem(pUnmanagedBytes);
fs.Close();
return bSuccess;
}

public bool SendStringToPrinter(string szPrinterName, string
szString)
{
IntPtr pBytes;
Int32 dwCount;
// How many characters are in the string?
dwCount = szString.Length;
// Assume that the printer is expecting ANSI text, and then
convert
// the string to ANSI text.
pBytes = Marshal.StringToCoTaskMemAnsi(szString);
// Send the converted ANSI string to the printer.
SendBytesToPrinter(szPrinterName, pBytes, dwCount);
Marshal.FreeCoTaskMem(pBytes);
return true;
}

#region Nested type: DOCINFOA

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public class DOCINFOA
{
[MarshalAs(UnmanagedType.LPStr)]
public string pDataType;

[MarshalAs(UnmanagedType.LPStr)]
public string pDocName;
[MarshalAs(UnmanagedType.LPStr)]
public string pOutputFile;
}

#endregion
}
}