Lm th? no ? g?i d? li?u th cho m?t my in b?ng cch s? d?ng Visual Basic.NET

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Bi vi?t t?ng b?c ny cho b?n th?y lm th? no ? s? d?ng Win32 b? ?m in ch?c nng t? m?t chng tr?nh m b?n t?o ra b?ng cch s? d?ng Visual Basic.NET.

Thng tin b sung

? g?i d? li?u th cho m?t my in t? Microsoft.NET Framework, chng tr?nh c?a b?n ph?i lm vi?c v?i ch?c nng ?m Win32. Thng qua cc.NET Khun kh?, b?n c th? in b?ng cch s? d?ng PrintDocument, PrintController, v lin quan ?n cc l?p h?c. Tuy nhin, v?i cc.NET Framework, b?n khng th? g?i d? li?u my in-s?n sng preformatted cho my in.

B?n c th? c th? g?i d? li?u th cho m?t my in ? lm nh sau:
  • G?i thot.
  • T?i v?, v sau s? d?ng phng ch? m?m.
  • Spool preprinted t?p tin.
? g?i cc lo?i v cc lo?i d? li?u th cho m?t my in, m? c?a b?n ph?i lm vi?c v?i giao di?n l?p tr?nh ?ng d?ng Win32 b? ?m in (API). Cc m? sau y cho th?y lm th? no ? ?c n?i dung c?a m?t preformatted t?p tin vo b? nh?, v sau g?i cc byte cho my in b?ng cch s? d?ng WritePrinter.

LU ?: B?n khng th? s? d?ng cch ti?p c?n ny trong vi?c in tng t? nh m?t b?n ?a PrintDocument vi?c in. B?n ph?i s? d?ng m?t trong hai t?nh.NET Framework ? in ho?c G?i byte vi?c in c?a ring b?n.


T?o m?t d? n c in d? li?u preformatted

? t?o ra cc d? n, h?y lm theo cc b?c sau:
  1. B?t ?u Visual Studio.NET. Trn cc Tp tr?nh n, nh?p vo M?i, sau b?m D an. D?i Cc lo?i d? n, b?m vo cc Visual Basic d? n th m?c. Trn cc Khun mu danh sch, b?m vo ?ng d?ng Windows, sau b?m Ok. Theo m?c ?nh, Form1 ?c t?o ra.
  2. Trn cc Xem tr?nh n, nh?p vo H?p cng c? hi?n th? h?p cng c?, v sau thm m?t nt ? Form1. Nt ny ?c ?t tn Button1.
  3. Thm khc nt ? Form1. Nt ny ?c ?t tn Button2.
  4. B?m p Button1. C?a s? m? cho cc h?nh th?c xu?t hi?n.
  5. Thay th? cc Button1_Click chng tr?nh con v?i o?n m? sau:
        ' Click event handler for a button - designed to show how to use the
        ' SendFileToPrinter and SendBytesToPrinter functions.
        Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
            ' Allow the user to select a file.
            Dim ofd As New OpenFileDialog()
            If ofd.ShowDialog(Me) Then
                ' Allow the user to select a printer.
                Dim pd As New PrintDialog()
                pd.PrinterSettings = New PrinterSettings()
                If (pd.ShowDialog() = DialogResult.OK) Then
                    ' Print the file to the printer.
                    RawPrinterHelper.SendFileToPrinter(pd.PrinterSettings.PrinterName, ofd.FileName)
                End If
            End If
        End Sub ' Button1_Click()
    					
  6. Thay th? cc Button2_Click chng tr?nh con v?i o?n m? sau:
        ' Click event handler for a button - designed to show how to use the
        ' SendBytesToPrinter function to send a string to the printer.
        Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
            Dim s As String
            Dim pd As New PrintDialog()
    
            ' You need a string to send.
            s = "Hello, this is a test"
            ' Open the printer dialog box, and then allow the user to select a printer.
            pd.PrinterSettings = New PrinterSettings()
            If (pd.ShowDialog() = DialogResult.OK) Then
                RawPrinterHelper.SendStringToPrinter(pd.PrinterSettings.PrinterName, s)
            End If
        End Sub ' Button2_Click()
    					
  7. Chn o?n m? sau ? ?u t?p tin:
    Imports System.IO
    Imports System.Drawing.Printing
    Imports System.Runtime.InteropServices
    					
  8. Thm m? sau bn trong ?ng d?ng chnh khng gian tn nhng bn ngoi no ?nh ngh?a l?p:
    Public Class RawPrinterHelper
        ' Structure and API declarions:
        <StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)> _
        Structure DOCINFOW
            <MarshalAs(UnmanagedType.LPWStr)> Public pDocName As String
            <MarshalAs(UnmanagedType.LPWStr)> Public pOutputFile As String
            <MarshalAs(UnmanagedType.LPWStr)> Public pDataType As String
        End Structure
    
        <DllImport("winspool.Drv", EntryPoint:="OpenPrinterW", _
           SetLastError:=True, CharSet:=CharSet.Unicode, _
           ExactSpelling:=True, CallingConvention:=CallingConvention.StdCall)> _
        Public Shared Function OpenPrinter(ByVal src As String, ByRef hPrinter As IntPtr, ByVal pd As Long) As Boolean
        End Function
        <DllImport("winspool.Drv", EntryPoint:="ClosePrinter", _
           SetLastError:=True, CharSet:=CharSet.Unicode, _
           ExactSpelling:=True, CallingConvention:=CallingConvention.StdCall)> _
        Public Shared Function ClosePrinter(ByVal hPrinter As IntPtr) As Boolean
        End Function
        <DllImport("winspool.Drv", EntryPoint:="StartDocPrinterW", _
           SetLastError:=True, CharSet:=CharSet.Unicode, _
           ExactSpelling:=True, CallingConvention:=CallingConvention.StdCall)> _
        Public Shared Function StartDocPrinter(ByVal hPrinter As IntPtr, ByVal level As Int32, ByRef pDI As DOCINFOW) As Boolean
        End Function
        <DllImport("winspool.Drv", EntryPoint:="EndDocPrinter", _
           SetLastError:=True, CharSet:=CharSet.Unicode, _
           ExactSpelling:=True, CallingConvention:=CallingConvention.StdCall)> _
        Public Shared Function EndDocPrinter(ByVal hPrinter As IntPtr) As Boolean
        End Function
        <DllImport("winspool.Drv", EntryPoint:="StartPagePrinter", _
           SetLastError:=True, CharSet:=CharSet.Unicode, _
           ExactSpelling:=True, CallingConvention:=CallingConvention.StdCall)> _
        Public Shared Function StartPagePrinter(ByVal hPrinter As IntPtr) As Boolean
        End Function
        <DllImport("winspool.Drv", EntryPoint:="EndPagePrinter", _
           SetLastError:=True, CharSet:=CharSet.Unicode, _
           ExactSpelling:=True, CallingConvention:=CallingConvention.StdCall)> _
        Public Shared Function EndPagePrinter(ByVal hPrinter As IntPtr) As Boolean
        End Function
        <DllImport("winspool.Drv", EntryPoint:="WritePrinter", _
           SetLastError:=True, CharSet:=CharSet.Unicode, _
           ExactSpelling:=True, CallingConvention:=CallingConvention.StdCall)> _
        Public Shared Function WritePrinter(ByVal hPrinter As IntPtr, ByVal pBytes As IntPtr, ByVal dwCount As Int32, ByRef dwWritten As Int32) As Boolean
        End Function
    
        ' 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 or False on failure.
        Public Shared Function SendBytesToPrinter(ByVal szPrinterName As String, ByVal pBytes As IntPtr, ByVal dwCount As Int32) As Boolean
            Dim hPrinter As IntPtr      ' The printer handle.
            Dim dwError As Int32        ' Last error - in case there was trouble.
            Dim di As DOCINFOW          ' Describes your document (name, port, data type).
            Dim dwWritten As Int32      ' The number of bytes written by WritePrinter().
            Dim bSuccess As Boolean     ' Your success code.
    
            ' Set up the DOCINFO structure.
            With di
                .pDocName = "My Visual Basic .NET RAW Document"
                .pDataType = "RAW"
            End With
            ' Assume failure unless you specifically succeed.
            bSuccess = False
            If OpenPrinter(szPrinterName, hPrinter, 0) Then
                If StartDocPrinter(hPrinter, 1, di) Then
                    If StartPagePrinter(hPrinter) Then
                        ' Write your printer-specific bytes to the printer.
                        bSuccess = WritePrinter(hPrinter, pBytes, dwCount, dwWritten)
                        EndPagePrinter(hPrinter)
                    End If
                    EndDocPrinter(hPrinter)
                End If
                ClosePrinter(hPrinter)
            End If
            ' If you did not succeed, GetLastError may give more information
            ' about why not.
            If bSuccess = False Then
                dwError = Marshal.GetLastWin32Error()
            End If
            Return bSuccess
        End Function ' SendBytesToPrinter()
    
        ' SendFileToPrinter()
        ' When the function is given a file name and a printer name, 
        ' the function reads the contents of the file and sends the
        ' contents to the printer.
        ' Presumes that the file contains printer-ready data.
        ' Shows how to use the SendBytesToPrinter function.
        ' Returns True on success or False on failure.
        Public Shared Function SendFileToPrinter(ByVal szPrinterName As String, ByVal szFileName As String) As Boolean
            ' Open the file.
            Dim fs As New FileStream(szFileName, FileMode.Open)
            ' Create a BinaryReader on the file.
            Dim br As New BinaryReader(fs)
            ' Dim an array of bytes large enough to hold the file's contents.
            Dim bytes(fs.Length) As Byte
            Dim bSuccess As Boolean
            ' Your unmanaged pointer.
            Dim pUnmanagedBytes As IntPtr
    
            ' Read the contents of the file into the array.
            bytes = br.ReadBytes(fs.Length)
            ' Allocate some unmanaged memory for those bytes.
            pUnmanagedBytes = Marshal.AllocCoTaskMem(fs.Length)
            ' Copy the managed byte array into the unmanaged array.
            Marshal.Copy(bytes, 0, pUnmanagedBytes, fs.Length)
            ' Send the unmanaged bytes to the printer.
            bSuccess = SendBytesToPrinter(szPrinterName, pUnmanagedBytes, fs.Length)
            ' Free the unmanaged memory that you allocated earlier.
            Marshal.FreeCoTaskMem(pUnmanagedBytes)
            Return bSuccess
        End Function ' SendFileToPrinter()
    
        ' When the function is given a string and a printer name,
        ' the function sends the string to the printer as raw bytes.
        Public Shared Function SendStringToPrinter(ByVal szPrinterName As String, ByVal szString As String)
            Dim pBytes As IntPtr
            Dim dwCount As Int32
            ' 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)
        End Function
    End Class
    					
  9. Nh?n F5 ? xy d?ng, v sau ch?y chng tr?nh.
  10. Nh?p vo Button1 ? t?i v in n?i dung c?a t?p tin.
  11. Nh?p vo Button2 ? in m?t chu?i. (B?n c th? c ? ?y trang theo cch th? cng b?i v? cc chu?i ?c g?i m khng c cc formfeed l?nh.)

THAM KH?O

? bi?t thm thng tin, h?y b?m vao s? bi vi?t sau ? xem bi vi?t trong C s? Ki?n th?c Microsoft:
138594Lm th? no ? g?i d? li?u th cho m?t my in b?ng cch s? d?ng Win32 API

Thu?c tnh

ID c?a bi: 322090 - L?n xem xt sau cng: 27 Thang Tam 2011 - Xem xt l?i: 2.0
p d?ng
  • Microsoft Visual Basic .NET 2002 Standard Edition
  • Microsoft Visual Basic .NET 2003 Standard Edition
  • Microsoft Windows XP Professional
T? kha:
kbdswgdi2003swept kbhowtomaster kbmt KB322090 KbMtvi
My d?ch
QUAN TRONG: Bi vi?t ny ?c d?ch b?ng ph?n m?m d?ch my c?a Microsoft ch? khng ph?i do con ng?i d?ch. Microsoft cung c?p cc bi vi?t do con ng?i d?ch v c? cc bi vi?t do my d?ch ? b?n c th? truy c?p vo t?t c? cc bi vi?t trong C s? Ki?n th?c c?a chng ti b?ng ngn ng? c?a b?n. Tuy nhin, bi vi?t do my d?ch khng ph?i lc no c?ng hon h?o. Lo?i bi vi?t ny c th? ch?a cc sai st v? t? v?ng, c php ho?c ng? php, gi?ng nh m?t ng?i n?c ngoi c th? m?c sai st khi ni ngn ng? c?a b?n. Microsoft khng ch?u trch nhi?m v? b?t k? s? thi?u chnh xc, sai st ho?c thi?t h?i no do vi?c d?ch sai n?i dung ho?c do ho?t ?ng s? d?ng c?a khch hng gy ra. Microsoft c?ng th?ng xuyn c?p nh?t ph?n m?m d?ch my ny.
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