RawPrintHelper Does not Printing even it is returning true

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C#

Hi,
I read a lot of posts about the direct printing with win API, i dont know if my code its wrong or im missing something I hope you can help me. I made 3 options: Print a File, print a string and print a stream, but when I use anyone of them the app sent the object to print but the printer doesnt print anything!

This is my code:

private void PrintFile_Click(object sender, EventArgs e)
         {
             // Allow the user to select a file.
             OpenFileDialog ofd = new OpenFileDialog();
             if (DialogResult.OK == ofd.ShowDialog(this))
             {
                 // Allow the user to select a printer.
                 PrintDialog pd = new PrintDialog();
                 pd.PrinterSettings = new PrinterSettings();
                 if (DialogResult.OK == pd.ShowDialog(this))
                 {
                     // Print the file to the printer.
                     PrintingPermission perm = new PrintingPermission(System.Security.
Permissions.PermissionState.Unrestricted);
                     perm.Level = PrintingPermissionLevel.AllPrinting;
                     
                     RawPrinterHelper.SendFileToPrinter(pd.PrinterSettings.PrinterName, ofd.
FileName);
                 }
             }
         }
 
         private void PrintString_Click(object sender, EventArgs e)
         {
             string s = "Hello"; // device-dependent string, need a FormFeed?
 
             // Allow the user to select a printer.
             PrintDialog pd = new PrintDialog();
             pd.PrinterSettings = new PrinterSettings();
             if (DialogResult.OK == pd.ShowDialog(this))
             {
                 // Send a printer-specific to the printer.
                 RawPrinterHelper.SendStringToPrinter(pd.PrinterSettings.PrinterName, s)
;
             }
 
         }
 
         private void PrintStream_Click(object sender, EventArgs e)
         {
             MemoryStream memStrm = new MemoryStream();
             StreamWriter sw = new StreamWriter(memStrm);
             sw.WriteLine("\x02L");
             sw.WriteLine("H07");
             sw.WriteLine("D11");
             sw.WriteLine("19110080200002510K Ny linje");
             sw.WriteLine("19110080100002510K OHM 1/4 WATT");
             sw.Flush();
             sw.WriteLine("1a6210000000050590PCS");
             sw.WriteLine("E");
             sw.WriteLine("");
             sw.Flush();
 
             memStrm.Position = 0;
             PrintDialog pd = new PrintDialog();
             pd.PrinterSettings = new PrinterSettings();
             if (DialogResult.OK == pd.ShowDialog(this))
             {
                 // Send a printer-specific to the printer.
                 RawPrinterHelper.SendStreamToPrinter(pd.PrinterSettings.PrinterName,
memStrm);
             }
             sw.Close();
         }
 
     }
 
     public class RawPrinterHelper
     {
         // Structure and API declarions:
         [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
         public class DOCINFOA
         {
             [MarshalAs(UnmanagedType.LPStr)]
             public string pDocName;
             [MarshalAs(UnmanagedType.LPStr)]
             public string pOutputFile;
             [MarshalAs(UnmanagedType.LPStr)]
             public string pDataType;
         }
         [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 static bool SendBytesToPrinter(string szPrinterName, IntPtr pBytes,
Int32 dwCount)
         {
             Int32 dwError = 0, dwWritten = 0;
             IntPtr hPrinter = new IntPtr(0);
             DOCINFOA di = new DOCINFOA();
             bool bSuccess = false; // Assume failure unless you specifically succeed.
 
             di.pDocName = "Test Label Print LINKS";
             di.pDataType = "RAW";
 
             // 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.
                         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)
             {
                 dwError = Marshal.GetLastWin32Error();
             }
             return bSuccess;
         }
 
         public static 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 = new Byte[fs.Length];
             bool bSuccess = false;
             // Your unmanaged pointer.
             IntPtr pUnmanagedBytes = new IntPtr(0);
             int nLength;
 
             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);
             return bSuccess;
         }
 
         public static bool SendStreamToPrinter(string szPrinterName, MemoryStream
szStream)
         {
             // Open the file.
             //FileStream fs = new FileStream(szFileName, FileMode.Open);
             // Create a BinaryReader on the file.
             BinaryReader br = new BinaryReader(szStream);
             // Dim an array of bytes big enough to hold the file's contents.
             Byte[] bytes = new Byte[szStream.Length];
             bool bSuccess = false;
             // Your unmanaged pointer.
             IntPtr pUnmanagedBytes = new IntPtr(0);
             int nLength;
 
             nLength = Convert.ToInt32(szStream.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.
             System.Threading.Thread.Sleep(5000);
             Marshal.FreeCoTaskMem(pUnmanagedBytes);
             return bSuccess;
         }
 
         public static 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;
         }
     }