form1.vb

Visual.Basic.NET实用编程百例-47.6M.zip

'添加命名空间
Imports System.IO
Imports System.Drawing
Imports System.Drawing.Printing
Public Class Form1
    Inherits System.Windows.Forms.Form
    Private PFont As Font
    Private ToPrint As StreamReader
#Region " Windows 窗体设计器生成的代码 "

    Public Sub New()
        MyBase.New()

        '该调用是 Windows 窗体设计器所必需的。
        InitializeComponent()

        '在 InitializeComponent() 调用之后添加任何初始化

    End Sub

    '窗体重写 dispose 以清理组件列表。
    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

    'Windows 窗体设计器所必需的
    Private components As System.ComponentModel.IContainer

    '注意: 以下过程是 Windows 窗体设计器所必需的
    '可以使用 Windows 窗体设计器修改此过程。
    '不要使用代码编辑器修改它。
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents Button2 As System.Windows.Forms.Button
    Friend WithEvents OpenFileDialog1 As System.Windows.Forms.OpenFileDialog
    Friend WithEvents PrintDocument1 As System.Drawing.Printing.PrintDocument
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Label1 = New System.Windows.Forms.Label
        Me.Button1 = New System.Windows.Forms.Button
        Me.Button2 = New System.Windows.Forms.Button
        Me.OpenFileDialog1 = New System.Windows.Forms.OpenFileDialog
        Me.PrintDocument1 = New System.Drawing.Printing.PrintDocument
        Me.SuspendLayout()
        '
        'Label1
        '
        Me.Label1.Location = New System.Drawing.Point(8, 8)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(280, 72)
        Me.Label1.TabIndex = 0
        Me.Label1.Text = "打印的文件："
        '
        'Button1
        '
        Me.Button1.Location = New System.Drawing.Point(56, 96)
        Me.Button1.Name = "Button1"
        Me.Button1.TabIndex = 1
        Me.Button1.Text = "打开文件"
        '
        'Button2
        '
        Me.Button2.Location = New System.Drawing.Point(168, 96)
        Me.Button2.Name = "Button2"
        Me.Button2.TabIndex = 2
        Me.Button2.Text = "打印"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.ClientSize = New System.Drawing.Size(292, 149)
        Me.Controls.Add(Me.Button2)
        Me.Controls.Add(Me.Button1)
        Me.Controls.Add(Me.Label1)
        Me.Name = "Form1"
        Me.Text = "打印文件"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub Print(ByVal sender As Object, ByVal ea As System.Drawing.Printing.PrintPageEventArgs)

        Dim lpp As Single = 0
        Dim yPos As Single = 0
        Dim count As Integer = 0
        Dim leftMargin As Single = ea.MarginBounds.Left
        Dim topMargin As Single = ea.MarginBounds.Top
        Dim line As String

        '算出行数
        lpp = ea.MarginBounds.Height / PFont.GetHeight(ea.Graphics)
        line = ToPrint.ReadLine()
        While (count < lpp And line <> Nothing)
            yPos = topMargin + (count * PFont.GetHeight(ea.Graphics))
            ea.Graphics.DrawString(line, PFont, Brushes.Black, _
            leftMargin, yPos, New StringFormat)
            count = count + 1
            If (count < lpp) Then
                line = ToPrint.ReadLine()
            End If
        End While
        '如果还有内容打印则下一页 ea.HasMorePages = True
        If (line <> Nothing) Then
            ea.HasMorePages = True
        Else
            '如果已经没有内容了不再打印
            ea.HasMorePages = False
        End If
    End Sub


    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        With Me.OpenFileDialog1
            .CheckFileExists = True
            .Multiselect = False
            .Filter = "文件类型(*.txt)|*.txt"
            .Title = "请选择文本文件"
        End With
        If (Me.OpenFileDialog1.ShowDialog() = System.Windows.Forms.DialogResult.OK) _
        And (OpenFileDialog1.FileName.Length > 0) Then
            Label1.Text = "打印的文件 :" + OpenFileDialog1.FileName()
        End If
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Try
            ToPrint = New StreamReader(OpenFileDialog1.FileName)
            Try
                PFont = New Font("宋体", 12)
                AddHandler PrintDocument1.PrintPage, New PrintPageEventHandler(AddressOf Print)
                PrintDocument1.Print()
            Finally
                ToPrint.Close()
            End Try
        Catch ex As Exception
            MessageBox.Show("打印出错 -- " + ex.Message)
        End Try
    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

    End Sub
End Class