form1.vb

Visual.Basic.NET实用编程百例-47.6M.zip

Public Class Form1
    Inherits System.Windows.Forms.Form
    Dim FileIndex, BmpFilePath, BmpFileName As String
#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
    Friend WithEvents PictureBox1 As System.Windows.Forms.PictureBox
    Friend WithEvents Button2 As System.Windows.Forms.Button
    Friend WithEvents ListBox1 As System.Windows.Forms.ListBox
    Friend WithEvents OpenFileDialog1 As System.Windows.Forms.OpenFileDialog
    Friend WithEvents FileListBox1 As Microsoft.VisualBasic.Compatibility.VB6.FileListBox
    '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 Button1 As System.Windows.Forms.Button
    Friend WithEvents Button3 As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Button2 = New System.Windows.Forms.Button
        Me.Button1 = New System.Windows.Forms.Button
        Me.FileListBox1 = New Microsoft.VisualBasic.Compatibility.VB6.FileListBox
        Me.ListBox1 = New System.Windows.Forms.ListBox
        Me.OpenFileDialog1 = New System.Windows.Forms.OpenFileDialog
        Me.PictureBox1 = New System.Windows.Forms.PictureBox
        Me.Button3 = New System.Windows.Forms.Button
        Me.SuspendLayout()
        '
        'Button2
        '
        Me.Button2.Location = New System.Drawing.Point(160, 232)
        Me.Button2.Name = "Button2"
        Me.Button2.Size = New System.Drawing.Size(56, 23)
        Me.Button2.TabIndex = 1
        Me.Button2.Text = "上一张"
        '
        'Button1
        '
        Me.Button1.Location = New System.Drawing.Point(80, 232)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(56, 23)
        Me.Button1.TabIndex = 1
        Me.Button1.Text = "打开"
        '
        'FileListBox1
        '
        Me.FileListBox1.Location = New System.Drawing.Point(40, 40)
        Me.FileListBox1.Name = "FileListBox1"
        Me.FileListBox1.Pattern = "*.*"
        Me.FileListBox1.Size = New System.Drawing.Size(120, 88)
        Me.FileListBox1.TabIndex = 3
        Me.FileListBox1.Visible = False
        '
        'ListBox1
        '
        Me.ListBox1.ItemHeight = 12
        Me.ListBox1.Location = New System.Drawing.Point(184, 40)
        Me.ListBox1.Name = "ListBox1"
        Me.ListBox1.Size = New System.Drawing.Size(120, 88)
        Me.ListBox1.TabIndex = 2
        Me.ListBox1.Visible = False
        '
        'PictureBox1
        '
        Me.PictureBox1.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
        Me.PictureBox1.Location = New System.Drawing.Point(20, 20)
        Me.PictureBox1.Name = "PictureBox1"
        Me.PictureBox1.Size = New System.Drawing.Size(330, 200)
        Me.PictureBox1.SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage
        Me.PictureBox1.TabIndex = 0
        Me.PictureBox1.TabStop = False
        '
        'Button3
        '
        Me.Button3.Location = New System.Drawing.Point(240, 232)
        Me.Button3.Name = "Button3"
        Me.Button3.Size = New System.Drawing.Size(56, 23)
        Me.Button3.TabIndex = 1
        Me.Button3.Text = "下一张"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.ClientSize = New System.Drawing.Size(372, 273)
        Me.Controls.Add(Me.FileListBox1)
        Me.Controls.Add(Me.ListBox1)
        Me.Controls.Add(Me.Button1)
        Me.Controls.Add(Me.Button2)
        Me.Controls.Add(Me.Button3)
        Me.Controls.Add(Me.PictureBox1)
        Me.Name = "Form1"
        Me.Text = "浏览多张图片"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim i As Integer, ilen As Integer
        OpenFileDialog1.DefaultExt = "BMP文件(*.BMP)|*.BMP"
        OpenFileDialog1.Filter = "BMP文件(*.BMP)|*.BMP|JPG文件(*.jpg)|*.jpg|ICO文件(*.ico)|*.ico|GIF文件(*.gif)|*.gif"
        OpenFileDialog1.ShowDialog() '打开文件
        ilen = Len(OpenFileDialog1.FileName)
        For i = 1 To ilen
            If Mid(OpenFileDialog1.FileName, ilen - i + 1, 1) = "\" Then
                BmpFilePath = Mid(OpenFileDialog1.FileName, 1, ilen - i + 1)
                BmpFileName = Mid(OpenFileDialog1.FileName, ilen - i + 2, ilen - i)
                Exit For
            End If
            System.Windows.Forms.Application.DoEvents()
        Next i
        FindFiles() '列出该目录下的所有图像文件
        ShowBmp() '显示图片
        If FileIndex = 0 Then
            Button1.Enabled = False
        Else
            Button1.Enabled = True
        End If
        If FileIndex = ListBox1.Items.Count - 1 Then
            Button2.Enabled = False
        Else
            Button2.Enabled = True
        End If

    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        If FileIndex = 0 Then '上一张
            Button1.Enabled = False
        Else
            FileIndex = FileIndex - 1
            Button2.Enabled = True
            ShowBmp()
        End If
    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        If FileIndex = ListBox1.Items.Count - 1 Then '下一张
            Button2.Enabled = False
        Else
            FileIndex = FileIndex + 1
            Button1.Enabled = True
            ShowBmp()
        End If
    End Sub

    Sub FindFiles()
        Dim m As Integer
        Dim t As Integer
        FileListBox1.Path = BmpFilePath
        ListBox1.Items.Clear()
        m = 0
        For t = 0 To FileListBox1.Items.Count - 1
            If Microsoft.VisualBasic.Right$(FileListBox1.Items(t), 4) = ".bmp" Or Microsoft.VisualBasic.Right$(FileListBox1.Items(t), 4) = ".BMP" _
                 Or Microsoft.VisualBasic.Right$(FileListBox1.Items(t), 4) = ".jpg" Or Microsoft.VisualBasic.Right$(FileListBox1.Items(t), 4) = ".gif" _
                 Or Microsoft.VisualBasic.Right$(FileListBox1.Items(t), 4) = ".ico" Then
                ListBox1.Items.Add(FileListBox1.Items(t))
                If FileListBox1.Items(t) = BmpFileName Then
                    FileIndex = m '纪录打开的文件
                End If
                m = m + 1
            End If
        Next
    End Sub

    Sub ShowBmp()
        PictureBox1.Image = Image.FromFile(ListBox1.Items(FileIndex))  '显示图片

    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        FileListBox1.Visible = False
        ListBox1.Visible = False
    End Sub
End Class