Hi ,
You would need to use the CreatFile API and then use the handled returned
by this call in a FileStream constructor that takesn an handle. Here is the
code for it, basically create a windows app and add a button to it and past
the following code
Imports System.IO
Imports System.Runtime.InteropServices
Public Class Form1
Inherits System.Windows.Forms.Form
#Region " Windows Form Designer generated code "
Public Sub New()
MyBase.New()
'This call is required by the Windows Form Designer.
InitializeComponent()
'Add any initialization after the InitializeComponent() call
End Sub
'Form overrides dispose to clean up the component list.
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing Then
If Not (components Is Nothing) Then
components.Dispose()
End If
End If
MyBase.Dispose(disposing)
End Sub
'Required by the Windows Form Designer
Private components As System.ComponentModel.IContainer
'NOTE: The following procedure is required by the Windows Form Designer
'It can be modified using the Windows Form Designer.
'Do not modify it using the code editor.
Friend WithEvents Button1 As System.Windows.Forms.Button
<System.Diagnostics.DebuggerStepThrough()> Private Sub
InitializeComponent()
Me.Button1 = New System.Windows.Forms.Button()
Me.SuspendLayout()
'
'Button1
'
Me.Button1.Location = New System.Drawing.Point(52, 84)
Me.Button1.Name = "Button1"
Me.Button1.Size = New System.Drawing.Size(120, 36)
Me.Button1.TabIndex = 1
Me.Button1.Text = "Print Test"
'
'Form1
'
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(260, 166)
Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.Button1})
Me.Name = "Form1"
Me.Text = "Form1"
Me.ResumeLayout(False)
End Sub
#End Region
Public Const GENERIC_WRITE = &H40000000
Public Const OPEN_EXISTING = 3
Public Const FILE_SHARE_WRITE = &H2
Dim LPTPORT As String
Dim hPort As Integer, hPortP As IntPtr
Dim retval As Integer
Public Declare Function CreateFile Lib "kernel32" Alias "CreateFileA" ( _
ByVal lpFileName As String, ByVal dwDesiredAccess As Integer, _
ByVal dwShareMode As Integer, _
<MarshalAs(UnmanagedType.Struct)> ByRef lpSecurityAttributes As
SECURITY_ATTRIBUTES, _
ByVal dwCreationDisposition As Integer, ByVal dwFlagsAndAttributes As
Integer, _
ByVal hTemplateFile As Integer) As Integer
Public Declare Function CloseHandle Lib "kernel32" Alias "CloseHandle"
(ByVal hObject As Integer) _
As Integer
<StructLayout(LayoutKind.Sequential)> Public Structure
SECURITY_ATTRIBUTES
Private nLength As Integer
Private lpSecurityDescriptor As Integer
Private bInheritHandle As Integer
End Structure
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) _
Handles Button1.Click
Dim Texxxt As String
Dim SA As SECURITY_ATTRIBUTES
Dim outFile As FileStream
LPTPORT = "LPT1"
hPort = CreateFile(LPTPORT, GENERIC_WRITE, FILE_SHARE_WRITE, SA,
OPEN_EXISTING, 0, 0)
hPortP = New IntPtr(hPort) 'convert Integer to IntPtr
outFile = New FileStream(hPortP, FileAccess.Write, False) 'Create
FileStream using Handle
Dim fileWriter As New StreamWriter(outFile)
fileWriter.WriteLine("First test line.")
fileWriter.WriteLine("Second test line.")
fileWriter.WriteLine("Third and final test line.")
fileWriter.Write(Chr(12)) 'FormFeed Character
fileWriter.Flush()
fileWriter.Close()
outFile.Close()
retval = CloseHandle(hPort)
End Sub
End Class
Anand Balasubramanian
Microsoft, Visual Basic .NET
This posting is provided "AS IS" with no warranties, and confers no rights.
Please reply to newsgroups only. Thanks
