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change page size for default printer

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stophereareyou:
there, this works exactly as I wanted,

this is class I found somewhere while searching internet,
it adds/changes custom paper size for default printer,
Spoiler
--- ---using System;
using System.Text;
using System.Runtime.InteropServices;
using System.Security;
using System.ComponentModel;
using System.Drawing.Printing;

namespace MJMCustomPrintForm
{
/// <summary>
/// Summary description for MJMCustomPrintForm.
/// </summary>
public class MJMCustomPrintForm
{
// Make a static class
private MJMCustomPrintForm()
{
}

[StructLayout(LayoutKind.Sequential, CharSet=CharSet.Auto)]
internal struct structPrinterDefaults
{
[MarshalAs(UnmanagedType.LPTStr)] public String pDatatype;
public IntPtr pDevMode;
[MarshalAs(UnmanagedType.I4)] public int DesiredAccess;
};

[DllImport("winspool.Drv", EntryPoint="OpenPrinter", SetLastError=true,
CharSet=CharSet.Unicode, ExactSpelling=false,CallingConvention=CallingConvention.StdCall),
SuppressUnmanagedCodeSecurityAttribute()]
internal static extern bool OpenPrinter([MarshalAs(UnmanagedType.LPTStr)]
string printerName,
out IntPtr phPrinter,
ref structPrinterDefaults pd);

[DllImport("winspool.Drv", EntryPoint="ClosePrinter", SetLastError=true,
CharSet=CharSet.Unicode, ExactSpelling=false,
CallingConvention=CallingConvention.StdCall),SuppressUnmanagedCodeSecurityAttribute()]
internal static extern bool ClosePrinter(IntPtr phPrinter);

[StructLayout(LayoutKind.Sequential, CharSet=CharSet.Auto)]
internal struct structSize
{
public Int32 width;
public Int32 height;
}

[StructLayout(LayoutKind.Sequential, CharSet=CharSet.Auto)]
internal struct structRect
{
public Int32 left;
public Int32 top;
public Int32 right;
public Int32 bottom;
}

[StructLayout(LayoutKind.Explicit, CharSet=CharSet.Unicode)]
internal struct FormInfo1
{
[FieldOffset(0), MarshalAs(UnmanagedType.I4)] public uint Flags;
[FieldOffset(4), MarshalAs(UnmanagedType.LPWStr)] public String pName;
[FieldOffset(8)] public structSize Size;
[FieldOffset(16)] public structRect ImageableArea;
};

[StructLayout(LayoutKind.Sequential, CharSet=CharSet.Ansi/* changed from CharSet=CharSet.Auto */)]
internal struct structDevMode
{
[MarshalAs(UnmanagedType.ByValTStr, SizeConst=32)] public String
dmDeviceName;
[MarshalAs(UnmanagedType.U2)] public short dmSpecVersion;
[MarshalAs(UnmanagedType.U2)] public short dmDriverVersion;
[MarshalAs(UnmanagedType.U2)] public short dmSize;
[MarshalAs(UnmanagedType.U2)] public short dmDriverExtra;
[MarshalAs(UnmanagedType.U4)] public int dmFields;
[MarshalAs(UnmanagedType.I2)] public short dmOrientation;
[MarshalAs(UnmanagedType.I2)] public short dmPaperSize;
[MarshalAs(UnmanagedType.I2)] public short dmPaperLength;
[MarshalAs(UnmanagedType.I2)] public short dmPaperWidth;
[MarshalAs(UnmanagedType.I2)] public short dmScale;
[MarshalAs(UnmanagedType.I2)] public short dmCopies;
[MarshalAs(UnmanagedType.I2)] public short dmDefaultSource;
[MarshalAs(UnmanagedType.I2)] public short dmPrintQuality;
[MarshalAs(UnmanagedType.I2)] public short dmColor;
[MarshalAs(UnmanagedType.I2)] public short dmDuplex;
[MarshalAs(UnmanagedType.I2)] public short dmYResolution;
[MarshalAs(UnmanagedType.I2)] public short dmTTOption;
[MarshalAs(UnmanagedType.I2)] public short dmCollate;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst=32)] public String dmFormName;
[MarshalAs(UnmanagedType.U2)] public short dmLogPixels;
[MarshalAs(UnmanagedType.U4)] public int dmBitsPerPel;
[MarshalAs(UnmanagedType.U4)] public int dmPelsWidth;
[MarshalAs(UnmanagedType.U4)] public int dmPelsHeight;
[MarshalAs(UnmanagedType.U4)] public int dmNup;
[MarshalAs(UnmanagedType.U4)] public int dmDisplayFrequency;
[MarshalAs(UnmanagedType.U4)] public int dmICMMethod;
[MarshalAs(UnmanagedType.U4)] public int dmICMIntent;
[MarshalAs(UnmanagedType.U4)] public int dmMediaType;
[MarshalAs(UnmanagedType.U4)] public int dmDitherType;
[MarshalAs(UnmanagedType.U4)] public int dmReserved1;
[MarshalAs(UnmanagedType.U4)] public int dmReserved2;
}

      [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Auto)]
         internal struct PRINTER_INFO_9
      {
         public IntPtr pDevMode;
      }

[DllImport("winspool.Drv", EntryPoint="AddFormW", SetLastError=true,
CharSet=CharSet.Unicode, ExactSpelling=true,
CallingConvention=CallingConvention.StdCall), SuppressUnmanagedCodeSecurityAttribute()]
internal static extern bool AddForm(
         IntPtr phPrinter,
[MarshalAs(UnmanagedType.I4)] int level,
         ref FormInfo1 form);

/*    This method is not used
[DllImport("winspool.Drv", EntryPoint="SetForm", SetLastError=true,
CharSet=CharSet.Unicode, ExactSpelling=false,
CallingConvention=CallingConvention.StdCall), SuppressUnmanagedCodeSecurityAttribute()]
internal static extern bool SetForm(IntPtr phPrinter, string paperName,
[MarshalAs(UnmanagedType.I4)] int level, ref FormInfo1 form);
*/
[DllImport("winspool.Drv", EntryPoint="DeleteForm", SetLastError=true,
CharSet=CharSet.Unicode, ExactSpelling=false,CallingConvention=CallingConvention.StdCall),
SuppressUnmanagedCodeSecurityAttribute()]
internal static extern bool DeleteForm(
         IntPtr phPrinter,
[MarshalAs(UnmanagedType.LPTStr)] string pName);

[DllImport("kernel32.dll", EntryPoint="GetLastError", SetLastError=false,
ExactSpelling=true, CallingConvention=CallingConvention.StdCall),
SuppressUnmanagedCodeSecurityAttribute()]
internal static extern Int32 GetLastError();

[DllImport("GDI32.dll", EntryPoint="CreateDC", SetLastError=true,
CharSet=CharSet.Unicode, ExactSpelling=false,
CallingConvention=CallingConvention.StdCall),
SuppressUnmanagedCodeSecurityAttribute()]
internal static extern IntPtr CreateDC([MarshalAs(UnmanagedType.LPTStr)]
string pDrive,
[MarshalAs(UnmanagedType.LPTStr)] string pName,
[MarshalAs(UnmanagedType.LPTStr)] string pOutput,
ref structDevMode pDevMode);

[DllImport("GDI32.dll", EntryPoint="ResetDC", SetLastError=true,
CharSet=CharSet.Unicode, ExactSpelling=false,
CallingConvention=CallingConvention.StdCall),
SuppressUnmanagedCodeSecurityAttribute()]
internal static extern IntPtr ResetDC(
         IntPtr hDC,
         ref structDevMode
pDevMode);

[DllImport("GDI32.dll", EntryPoint="DeleteDC", SetLastError=true,
CharSet=CharSet.Unicode, ExactSpelling=false,
CallingConvention=CallingConvention.StdCall),
SuppressUnmanagedCodeSecurityAttribute()]
internal static extern bool DeleteDC(IntPtr hDC);

      [DllImport("winspool.Drv", EntryPoint="SetPrinterA", SetLastError=true,
          CharSet=CharSet.Auto, ExactSpelling=true,
          CallingConvention=CallingConvention.StdCall), SuppressUnmanagedCodeSecurityAttribute()]
      internal static extern bool SetPrinter(
         IntPtr hPrinter,
         [MarshalAs(UnmanagedType.I4)] int level,
         IntPtr pPrinter,
         [MarshalAs(UnmanagedType.I4)] int command);

      /*
       LONG DocumentProperties(
         HWND hWnd,               // handle to parent window
         HANDLE hPrinter,         // handle to printer object
         LPTSTR pDeviceName,      // device name
         PDEVMODE pDevModeOutput, // modified device mode
         PDEVMODE pDevModeInput,  // original device mode
         DWORD fMode              // mode options
         );
       */
      [DllImport("winspool.Drv", EntryPoint="DocumentPropertiesA", SetLastError=true,
      ExactSpelling=true, CallingConvention=CallingConvention.StdCall)]
      public static extern int DocumentProperties(
         IntPtr hwnd,
         IntPtr hPrinter,
         [MarshalAs(UnmanagedType.LPStr)] string pDeviceName /* changed from String to string */,
         IntPtr pDevModeOutput,
         IntPtr pDevModeInput,
         int fMode
         );

      [DllImport("winspool.Drv", EntryPoint="GetPrinterA", SetLastError=true,
      ExactSpelling=true, CallingConvention=CallingConvention.StdCall)]
      public static extern bool GetPrinter(
         IntPtr hPrinter,
         int dwLevel /* changed type from Int32 */,
         IntPtr pPrinter,
         int dwBuf /* chagned from Int32*/,
         out int dwNeeded /* changed from Int32*/
         );

      // SendMessageTimeout tools
      [Flags] public enum SendMessageTimeoutFlags : uint
      {
         SMTO_NORMAL         = 0x0000,
         SMTO_BLOCK          = 0x0001,
         SMTO_ABORTIFHUNG    = 0x0002,
         SMTO_NOTIMEOUTIFNOTHUNG = 0x0008
      }
      const int WM_SETTINGCHANGE = 0x001A;
      const int HWND_BROADCAST = 0xffff;

      [DllImport("user32.dll", SetLastError=true, CharSet=CharSet.Auto)]
      public static extern IntPtr SendMessageTimeout(
         IntPtr windowHandle,
         uint Msg,
         IntPtr wParam,
         IntPtr lParam,
         SendMessageTimeoutFlags flags,
         uint timeout,
         out IntPtr result
         );
     
      public static void AddMjm80MmPaperSizeToDefaultPrinter()
      {
         AddCustomPaperSizeToDefaultPrinter("MJM 80mm * Receipt Length", 80.1f, 4003.9f);
      }

      public static void AddMjm104MmPaperSizeToDefaultPrinter()
      {
         AddCustomPaperSizeToDefaultPrinter("MJM 104mm * Receipt Length", 104.1f, 4003.9f);
      }

      /// <summary>
      /// Adds the printer form to the default printer
      /// </summary>
      /// <param name="paperName">Name of the printer form</param>
      /// <param name="widthMm">Width given in millimeters</param>
      /// <param name="heightMm">Height given in millimeters</param>
      public static void AddCustomPaperSizeToDefaultPrinter(string paperName, float widthMm, float heightMm)
      {
         PrintDocument pd = new PrintDocument();
         string sPrinterName = pd.PrinterSettings.PrinterName;
         AddCustomPaperSize(sPrinterName, paperName, widthMm, heightMm);
      }

      /// <summary>
      /// Add the printer form to a printer
      /// </summary>
      /// <param name="printerName">The printer name</param>
      /// <param name="paperName">Name of the printer form</param>
      /// <param name="widthMm">Width given in millimeters</param>
      /// <param name="heightMm">Height given in millimeters</param>
public static void AddCustomPaperSize(string printerName, string paperName, float
widthMm, float heightMm)
{
if (PlatformID.Win32NT == Environment.OSVersion.Platform)
{
// The code to add a custom paper size is different for Windows NT then it is
// for previous versions of windows

const int PRINTER_ACCESS_USE = 0x00000008;
const int PRINTER_ACCESS_ADMINISTER = 0x00000004;
const int FORM_PRINTER =   0x00000002;

structPrinterDefaults defaults = new structPrinterDefaults();
defaults.pDatatype = null;
defaults.pDevMode = IntPtr.Zero;
defaults.DesiredAccess = PRINTER_ACCESS_ADMINISTER | PRINTER_ACCESS_USE;

IntPtr hPrinter = IntPtr.Zero;

// Open the printer.
if (OpenPrinter(printerName, out hPrinter, ref defaults))
{
try
{
                  // delete the form incase it already exists
DeleteForm(hPrinter, paperName);
                  // create and initialize the FORM_INFO_1 structure
FormInfo1 formInfo = new FormInfo1();
formInfo.Flags = 0;
formInfo.pName = paperName;
                  // all sizes in 1000ths of millimeters
formInfo.Size.width = (int)(widthMm * 1000.0);
formInfo.Size.height = (int)(heightMm * 1000.0);
formInfo.ImageableArea.left = 0;
formInfo.ImageableArea.right = formInfo.Size.width;
formInfo.ImageableArea.top = 0;
formInfo.ImageableArea.bottom = formInfo.Size.height;
if (!AddForm(hPrinter, 1, ref formInfo))
{
StringBuilder strBuilder = new StringBuilder();
strBuilder.AppendFormat("Failed to add the custom paper size {0} to the printer {1}, System error number: {2}",
paperName, printerName, GetLastError());
throw new ApplicationException(strBuilder.ToString());
}

                  // INIT
                  const int DM_OUT_BUFFER = 2;
                  const int DM_IN_BUFFER = 8;
                  structDevMode devMode = new structDevMode();
                  IntPtr hPrinterInfo, hDummy;
                  PRINTER_INFO_9 printerInfo;
                  printerInfo.pDevMode = IntPtr.Zero;
                  int iPrinterInfoSize, iDummyInt;


                  // GET THE SIZE OF THE DEV_MODE BUFFER
                  int iDevModeSize = DocumentProperties(IntPtr.Zero, hPrinter, printerName, IntPtr.Zero, IntPtr.Zero, 0);

                  if(iDevModeSize < 0)
                     throw new ApplicationException("Cannot get the size of the DEVMODE structure.");

                  // ALLOCATE THE BUFFER
                  IntPtr hDevMode = Marshal.AllocCoTaskMem(iDevModeSize + 100);

                  // GET A POINTER TO THE DEV_MODE BUFFER
                  int iRet = DocumentProperties(IntPtr.Zero, hPrinter, printerName, hDevMode, IntPtr.Zero, DM_OUT_BUFFER);

                  if(iRet < 0)
                     throw new ApplicationException("Cannot get the DEVMODE structure.");

                  // FILL THE DEV_MODE STRUCTURE
                  devMode = (structDevMode)Marshal.PtrToStructure(hDevMode, devMode.GetType());

                  // SET THE FORM NAME FIELDS TO INDICATE THAT THIS FIELD WILL BE MODIFIED
                  devMode.dmFields = 0x10000; // DM_FORMNAME
                  // SET THE FORM NAME
                  devMode.dmFormName = paperName;

                  // PUT THE DEV_MODE STRUCTURE BACK INTO THE POINTER
                  Marshal.StructureToPtr(devMode, hDevMode, true);

                  // MERGE THE NEW CHAGES WITH THE OLD
                  iRet = DocumentProperties(IntPtr.Zero, hPrinter, printerName,
                           printerInfo.pDevMode, printerInfo.pDevMode, DM_IN_BUFFER | DM_OUT_BUFFER);

                  if(iRet < 0)
                     throw new ApplicationException("Unable to set the orientation setting for this printer.");

                  // GET THE PRINTER INFO SIZE
                  GetPrinter(hPrinter, 9, IntPtr.Zero, 0, out iPrinterInfoSize);
                  if(iPrinterInfoSize == 0)
                     throw new ApplicationException("GetPrinter failed. Couldn't get the # bytes needed for shared PRINTER_INFO_9 structure");

                  // ALLOCATE THE BUFFER
                  hPrinterInfo = Marshal.AllocCoTaskMem(iPrinterInfoSize + 100);

                  // GET A POINTER TO THE PRINTER INFO BUFFER
                  bool bSuccess = GetPrinter(hPrinter, 9, hPrinterInfo, iPrinterInfoSize, out iDummyInt);

                  if(!bSuccess)
                     throw new ApplicationException("GetPrinter failed. Couldn't get the shared PRINTER_INFO_9 structure");

                  // FILL THE PRINTER INFO STRUCTURE
                  printerInfo = (PRINTER_INFO_9)Marshal.PtrToStructure(hPrinterInfo, printerInfo.GetType());
                  printerInfo.pDevMode = hDevMode;

                  // GET A POINTER TO THE PRINTER INFO STRUCTURE
                  Marshal.StructureToPtr(printerInfo, hPrinterInfo, true);

                  // SET THE PRINTER SETTINGS
                  bSuccess = SetPrinter(hPrinter, 9, hPrinterInfo, 0);

                  if(!bSuccess)
                     throw new Win32Exception(Marshal.GetLastWin32Error(), "SetPrinter() failed.  Couldn't set the printer settings");

                  // Tell all open programs that this change occurred.
                  SendMessageTimeout(
                     new IntPtr(HWND_BROADCAST),
                     WM_SETTINGCHANGE,
                     IntPtr.Zero,
                     IntPtr.Zero,
                     MJMCustomPrintForm.SendMessageTimeoutFlags.SMTO_NORMAL,
                     1000,
                     out hDummy);
}
finally
{
ClosePrinter(hPrinter);
}
}
else
{
StringBuilder strBuilder = new StringBuilder();
strBuilder.AppendFormat("Failed to open the {0} printer, System error number: {1}",
printerName, GetLastError());
throw new ApplicationException(strBuilder.ToString());
}
}
else
{
structDevMode pDevMode = new structDevMode();
IntPtr hDC = CreateDC(null, printerName, null, ref pDevMode);
if (hDC != IntPtr.Zero)
{
const long DM_PAPERSIZE = 0x00000002L;
const long DM_PAPERLENGTH = 0x00000004L;
const long DM_PAPERWIDTH = 0x00000008L;
pDevMode.dmFields = (int)(DM_PAPERSIZE | DM_PAPERWIDTH | DM_PAPERLENGTH);
pDevMode.dmPaperSize = 256;
pDevMode.dmPaperWidth = (short)(widthMm * 1000.0);
pDevMode.dmPaperLength = (short)(heightMm * 1000.0);
ResetDC(hDC, ref pDevMode);
DeleteDC(hDC);
}
}
}
}
}

I'm adding this to know everyone that I have found the solution, and may be as information...
I don't understand all the code but calling function with paper name and height, width works as I wanted
through this method

--- ---public static void AddCustomPaperSize(string printerName, string paperName, float widthMm, float heightMm) rough example:

--- ---printerName = getPrinterName()// code to get Default Printer Name;
float width = 12.0F; //fixed in my case
float height = 4.5; //size of report without item rows

height += getNumberOfRows() //get here Number of Rows of Content and add it to height
AddCustomPaperSize(printerName, "customPaper", width, height); //call function

//code for print may be here
,


thanks for help everyone,
really getting replies/answers for question makes feel that someone is helping me along side me on this project...

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