SizePic 说明：可以用于WEB网站图片缩略图的批量处理

昨天网友问我怎样获得图片的缩略图，我说简单，但是他说要保持原来的比例，且缩略图的大小是固定的尺寸，我说要思考一会儿。

我数学憋到极点，哎！但是这个我还是算得来

如图

下面是源代码：

'************************************

'* ---------SizePic------------

'说明：可以用于WEB网站图片缩略图的批量处理

'*支持jpg,bmp,pnp,gif,tif

'* author:wgscd

'* Dte:2005/09/30

'*由于用了异常捕捉try，可能效率得到了限制

'*部分代码许完善

'*QQ:153964481

'**********************************

Public Class Form1

Inherits System.Windows.Forms.Form

#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

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 PictureBox1 As System.Windows.Forms.PictureBox

Friend WithEvents Button1 As System.Windows.Forms.Button

Friend WithEvents TextBox1 As System.Windows.Forms.TextBox

Friend WithEvents Button2 As System.Windows.Forms.Button

Friend WithEvents TextBox2 As System.Windows.Forms.TextBox

Friend WithEvents Button3 As System.Windows.Forms.Button

Friend WithEvents Label1 As System.Windows.Forms.Label

Friend WithEvents Label2 As System.Windows.Forms.Label

Friend WithEvents NumericUpDown1 As System.Windows.Forms.NumericUpDown

Friend WithEvents NumericUpDown2 As System.Windows.Forms.NumericUpDown

Friend WithEvents Label3 As System.Windows.Forms.Label

Friend WithEvents Label4 As System.Windows.Forms.Label

Friend WithEvents GroupBox1 As System.Windows.Forms.GroupBox

Friend WithEvents ProgressBar1 As System.Windows.Forms.ProgressBar

<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()

Dim resources As System.Resources.ResourceManager = New System.Resources.ResourceManager(GetType(Form1))

Me.PictureBox1 = New System.Windows.Forms.PictureBox

Me.Button1 = New System.Windows.Forms.Button

Me.TextBox1 = New System.Windows.Forms.TextBox

Me.Button2 = New System.Windows.Forms.Button

Me.TextBox2 = New System.Windows.Forms.TextBox

Me.Button3 = New System.Windows.Forms.Button

Me.Label1 = New System.Windows.Forms.Label

Me.Label2 = New System.Windows.Forms.Label

Me.NumericUpDown1 = New System.Windows.Forms.NumericUpDown

Me.NumericUpDown2 = New System.Windows.Forms.NumericUpDown

Me.Label3 = New System.Windows.Forms.Label

Me.Label4 = New System.Windows.Forms.Label

Me.GroupBox1 = New System.Windows.Forms.GroupBox

Me.ProgressBar1 = New System.Windows.Forms.ProgressBar

CType(Me.NumericUpDown1, System.ComponentModel.ISupportInitialize).BeginInit()

CType(Me.NumericUpDown2, System.ComponentModel.ISupportInitialize).BeginInit()

Me.GroupBox1.SuspendLayout()

Me.SuspendLayout()

'PictureBox1

Me.PictureBox1.Image = CType(resources.GetObject("PictureBox1.Image"), System.Drawing.Image)

Me.PictureBox1.Location = New System.Drawing.Point(424, 16)

Me.PictureBox1.Name = "PictureBox1"

Me.PictureBox1.Size = New System.Drawing.Size(112, 104)

Me.PictureBox1.TabIndex = 0

Me.PictureBox1.TabStop = False

'Button1

Me.Button1.Font = New System.Drawing.Font("Monotype Corsiva", 15.0!, System.Drawing.FontStyle.Italic, System.Drawing.GraphicsUnit.Point, CType(0, Byte))

Me.Button1.Location = New System.Drawing.Point(320, 112)

Me.Button1.Name = "Button1"

Me.Button1.Size = New System.Drawing.Size(88, 40)

Me.Button1.TabIndex = 1

Me.Button1.Text = "转换"

'TextBox1

Me.TextBox1.Location = New System.Drawing.Point(128, 16)

Me.TextBox1.Name = "TextBox1"

Me.TextBox1.Size = New System.Drawing.Size(184, 21)

Me.TextBox1.TabIndex = 2

Me.TextBox1.Text = "TextBox1"

'Button2

Me.Button2.Location = New System.Drawing.Point(328, 16)

Me.Button2.Name = "Button2"

Me.Button2.TabIndex = 3

Me.Button2.Text = "文件夹"

'TextBox2

Me.TextBox2.Location = New System.Drawing.Point(128, 56)

Me.TextBox2.Name = "TextBox2"

Me.TextBox2.Size = New System.Drawing.Size(184, 21)

Me.TextBox2.TabIndex = 4

Me.TextBox2.Text = "TextBox2"

'Button3

Me.Button3.Location = New System.Drawing.Point(328, 56)

Me.Button3.Name = "Button3"

Me.Button3.Size = New System.Drawing.Size(75, 24)

Me.Button3.TabIndex = 5

Me.Button3.Text = "保存路径"

'Label1

Me.Label1.Location = New System.Drawing.Point(16, 16)

Me.Label1.Name = "Label1"

Me.Label1.Size = New System.Drawing.Size(104, 23)

Me.Label1.TabIndex = 6

Me.Label1.Text = "图片文件夹路径"

'Label2

Me.Label2.Location = New System.Drawing.Point(16, 56)

Me.Label2.Name = "Label2"

Me.Label2.Size = New System.Drawing.Size(80, 23)

Me.Label2.TabIndex = 7

Me.Label2.Text = "输出图片路径"

'NumericUpDown1

Me.NumericUpDown1.Location = New System.Drawing.Point(64, 32)

Me.NumericUpDown1.Maximum = New Decimal(New Integer() {22222, 0, 0, 0})

Me.NumericUpDown1.Name = "NumericUpDown1"

Me.NumericUpDown1.Size = New System.Drawing.Size(64, 21)

Me.NumericUpDown1.TabIndex = 8

Me.NumericUpDown1.Value = New Decimal(New Integer() {70, 0, 0, 0})

'NumericUpDown2

Me.NumericUpDown2.Location = New System.Drawing.Point(200, 32)

Me.NumericUpDown2.Maximum = New Decimal(New Integer() {2222, 0, 0, 0})

Me.NumericUpDown2.Name = "NumericUpDown2"

Me.NumericUpDown2.Size = New System.Drawing.Size(64, 21)

Me.NumericUpDown2.TabIndex = 9

Me.NumericUpDown2.Value = New Decimal(New Integer() {70, 0, 0, 0})

'Label3

Me.Label3.Location = New System.Drawing.Point(24, 32)

Me.Label3.Name = "Label3"

Me.Label3.Size = New System.Drawing.Size(24, 23)

Me.Label3.TabIndex = 10

Me.Label3.Text = "宽"

'Label4

Me.Label4.Location = New System.Drawing.Point(152, 32)

Me.Label4.Name = "Label4"

Me.Label4.Size = New System.Drawing.Size(40, 23)

Me.Label4.TabIndex = 11

Me.Label4.Text = "高"

'GroupBox1

Me.GroupBox1.Controls.Add(Me.NumericUpDown2)

Me.GroupBox1.Controls.Add(Me.Label4)

Me.GroupBox1.Controls.Add(Me.Label3)

Me.GroupBox1.Controls.Add(Me.NumericUpDown1)

Me.GroupBox1.Location = New System.Drawing.Point(16, 88)

Me.GroupBox1.Name = "GroupBox1"

Me.GroupBox1.Size = New System.Drawing.Size(296, 64)

Me.GroupBox1.TabIndex = 12

Me.GroupBox1.TabStop = False

Me.GroupBox1.Text = "设置需要的尺寸（单位像数）"

'ProgressBar1

Me.ProgressBar1.Location = New System.Drawing.Point(416, 128)

Me.ProgressBar1.Name = "ProgressBar1"

Me.ProgressBar1.Size = New System.Drawing.Size(120, 16)

Me.ProgressBar1.TabIndex = 13

'Form1

Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)

Me.ClientSize = New System.Drawing.Size(552, 166)

Me.Controls.Add(Me.ProgressBar1)

Me.Controls.Add(Me.GroupBox1)

Me.Controls.Add(Me.Label2)

Me.Controls.Add(Me.Label1)

Me.Controls.Add(Me.Button3)

Me.Controls.Add(Me.TextBox2)

Me.Controls.Add(Me.Button2)

Me.Controls.Add(Me.TextBox1)

Me.Controls.Add(Me.Button1)

Me.Controls.Add(Me.PictureBox1)

Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle

Me.MinimizeBox = False

Me.Name = "Form1"

Me.Text = "SizePic wgscd @ 2005"

CType(Me.NumericUpDown1, System.ComponentModel.ISupportInitialize).EndInit()

CType(Me.NumericUpDown2, System.ComponentModel.ISupportInitialize).EndInit()

Me.GroupBox1.ResumeLayout(False)

Me.ResumeLayout(False)

End Sub

#End Region

Dim SizeW As Integer = 70

Dim SizeH As Integer = 70

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

SizeW = NumericUpDown1.Value

SizeH = NumericUpDown2.Value

doJob()

End Sub

Sub doJob()

Dim dir As New IO.DirectoryInfo(Me.TextBox1.Text)

Dim img As Bitmap

Dim f As IO.FileInfo

Dim i As Integer

' Me.ProgressBar1.Maximum = dir.GetFiles.Length

' MsgBox("一共有" & dir.GetFiles.Length & "个文件，请稍等处理。。。")

For Each f In dir.GetFiles

If f.Extension.ToLower = ".jpg" Or f.Extension.ToLower = ".bmp" Or f.Extension.ToLower = ".png" Or f.Extension.ToLower = ".gif" Then

img = Image.FromFile(f.FullName)

Dim w, h As Integer

w = img.Width

h = img.Height

If w > SizeW AndAlso h > SizeH Then

If w / h > 1 Then '判断宽和高比例,如果搞高比宽小

Dim imgok As New Bitmap(img, (w / h) * SizeW, SizeH) '以高为基本

Dim okW, okH, a, g, b As Integer

Dim okColor As Color

okW = imgok.Width - 1

okH = imgok.Height - 1

Dim newBitmp As New Bitmap(SizeW, SizeH)

Try

For iW As Integer = 0 To SizeW - 1

For iH As Integer = 0 To SizeH - 1 '以高为基本

'MsgBox(SizeW - 1) '''''''''''

okColor = imgok.GetPixel(iW, iH)

newBitmp.SetPixel(iW, iH, okColor)

Catch ex As Exception

MsgBox(ex.ToString)

End Try

Me.PictureBox1.Image = imgok

Me.PictureBox1.Refresh()

' imgok.Save(Me.TextBox2.Text & "\PIC_" & i & ".jpg")

Try

newBitmp.Save(Me.TextBox2.Text & "\PIC_" & i & ".jpg")

Catch ex As Exception

MsgBox(ex.ToString)

End Try

Else

Dim imgok As New Bitmap(img, SizeW, (h / w) * SizeW) '以宽为基本

Dim okW, okH, a, g, b As Integer

Dim okColor As Color

okW = imgok.Width - 1

okH = imgok.Height - 1

Dim newBitmp As New Bitmap(SizeW, SizeH)

Try

For iW As Integer = 0 To SizeW - 1

For iH As Integer = 0 To SizeH - 1 '以宽为基本

'MsgBox(SizeW - 1) '''''''''''

okColor = imgok.GetPixel(iW, iH)

newBitmp.SetPixel(iW, iH, okColor)

Catch ex As Exception

MsgBox(ex.ToString)

End Try

Me.PictureBox1.Image = imgok

Me.PictureBox1.Refresh()

' imgok.Save(Me.TextBox2.Text & "\PIC_" & i & ".jpg")

Try

newBitmp.Save(Me.TextBox2.Text & "\PIC_" & i & ".jpg")

Catch ex As Exception

MsgBox(ex.ToString)

End Try

End If

i += 1

ProgressBar1.Value += 20

If ProgressBar1.Value >= 100 Then

ProgressBar1.Value = 0

End If

MsgBox("完成")

System.Diagnostics.Process.Start(TextBox2.Text)

ProgressBar1.Value = 0

End Sub

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

Me.TextBox1.Text = System.Environment.GetFolderPath(Environment.SpecialFolder.MyPictures)

Me.TextBox2.Text = System.Environment.GetFolderPath(Environment.SpecialFolder.MyPictures)

End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

Dim fbd As New FolderBrowserDialog

If fbd.ShowDialog = DialogResult.OK Then

Me.TextBox1.Text = fbd.SelectedPath

End If

End Sub

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click

Dim fbd As New FolderBrowserDialog

If fbd.ShowDialog = DialogResult.OK Then

Me.TextBox2.Text = fbd.SelectedPath

End If

End Sub

Private Sub GroupBox1_Enter(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles GroupBox1.Enter

End Sub

Private Sub PictureBox1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles PictureBox1.Click

End Sub

Private Sub PictureBox1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles PictureBox1.MouseDown

If e.Button = MouseButtons.Left Then

End If

End Sub

End Class