Sending data to USB printer in C #?

Using system;using system.drawing;using system.drawing.printing;using system.io;using System.runtime.interopservices;using System.windows.forms;public class rawprinterhelper{//Structure and API Declarions: [StructLayout (LayoutKind.Sequential, Charset=charset.ansi)] public class Docinfoa {[MarshalAs (unmanaged    TYPE.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 (Unma  nagedtype.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 was given a printer name and an unmanaged array//of bytes, the function se  NDS 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, DWW    Ritten = 0;    IntPtr hprinter = new IntPtr (0);    Docinfoa di = new Docinfoa (); BOOL bsuccess = false;    Assume failure unless you specifically succeed.    Di.pdocname = "My c#.net RAW Document";    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 do not succeed, GetLastError could give more information//for 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 so you allocated earlier.    Marshal.freecotaskmem (punmanagedbytes);  return bsuccess;    public static bool Sendstringtoprinter (string szprintername, String szstring) {IntPtr pbytes;    Int32 dwcount;    How many characters is in the string?    Fix from Nicholas Piasecki://dwcount = Szstring.length;    Dwcount = (szstring.length + 1) * marshal.systemmaxdbcscharsize;    Assume 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; }}

 Public partial class usb:form{public USB () {InitializeComponent (); }//Structure and API declarions: [StructLayout (layoutkind.sequential, CharSet = charset.ansi)] public class DOC        INFOA {[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, O    UT IntPtr hprinter, IntPtr PD); [DllImport ("WinSpool. Drv ", EntryPoint =" ClosePrinter ", SetLastError = True, ExactSpelling = true, CallingConvention = callingconvention.stdcal    L)] public static extern bool ClosePrinter (IntPtr hprinter); [DllImport ("WinSpool. Drv ", EntryPoint =" StarTdocprintera ", SetLastError = true, CharSet = CharSet.Ansi, ExactSpelling = true, CallingConvention = Callingconvention.st  Dcall)] 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.STDCA    LL)] public static extern bool Enddocprinter (IntPtr hprinter); [DllImport ("WinSpool. Drv ", EntryPoint =" Startpageprinter ", SetLastError = True, ExactSpelling = true, CallingConvention = Callingconvention.st    Dcall)] public static extern bool Startpageprinter (IntPtr hprinter); [DllImport ("WinSpool. Drv ", EntryPoint =" Endpageprinter ", SetLastError = True, ExactSpelling = true, CallingConvention = Callingconvention.stdc    All)] 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 pBy    TES, Int32 dwcount, out Int32 dwwritten); SendBytesToPrinter ()//When the function was given a printer name and an unmanaged array//of bytes, the Functio    n 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, D        Wwritten = 0;        IntPtr hprinter = new IntPtr (0);        Docinfoa di = new Docinfoa (); BOOL bsuccess = false;        Assume failure unless you specifically succeed.        Di.pdocname = "My c#.net RAW Document";        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 do not succeed, GetLastError could give more information//for 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 so you allocated earlier.        Marshal.freecotaskmem (punmanagedbytes);    return bsuccess;        public static bool Sendstringtoprinter (string szprintername, String szstring) {IntPtr pbytes;        Int32 dwcount;        How many characters is in the string?        Fix from Nicholas Piasecki://dwcount = Szstring.length; Dwcount = (sZstring.length + 1) * marshal.systemmaxdbcscharsize;        Assume 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;  private void Buttonsend_click (object sender, EventArgs e) {System.Windows.Forms.OpenFileDialog open =        New System.Windows.Forms.OpenFileDialog ();        string dados = ""; if (open. ShowDialog (). Equals (DialogResult.OK)) {StreamReader sr = new StreamReader (open.            FileName); Dados = Sr.            ReadToEnd (); Sr.        Close ();        } String printer = "Printer NAME";            for (int i = 0; i < i++) {sendstringtoprinter (printer, dados); }    }}

Sending data to USB printer in C #?