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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()
InitializeComponent()
'在 InitializeComponent() 调用之后添加任何初始化
End Sub
'窗体重写处置以清理组件列表。
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 Button1 As System.Windows.Forms.Button
Friend WithEvents Button2 As System.Windows.Forms.Button
Friend WithEvents PictureBox1 As System.Windows.Forms.PictureBox
Friend WithEvents Button3 As System.Windows.Forms.Button
Friend WithEvents Label1 As System.Windows.Forms.Label
Friend WithEvents Label2 As System.Windows.Forms.Label
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.Button1 = New System.Windows.Forms.Button()
Me.Button2 = New System.Windows.Forms.Button()
Me.PictureBox1 = New System.Windows.Forms.PictureBox()
Me.Button3 = New System.Windows.Forms.Button()
Me.Label1 = New System.Windows.Forms.Label()
Me.Label2 = New System.Windows.Forms.Label()
Me.SuspendLayout()
'
'Button1
'
Me.Button1.Location = New System.Drawing.Point(365, 63)
Me.Button1.Name = "Button1"
Me.Button1.Size = New System.Drawing.Size(115, 23)
Me.Button1.TabIndex = 0
Me.Button1.Text = "将图象保存成XML"
'
'Button2
'
Me.Button2.Location = New System.Drawing.Point(365, 98)
Me.Button2.Name = "Button2"
Me.Button2.Size = New System.Drawing.Size(115, 23)
Me.Button2.TabIndex = 1
Me.Button2.Text = "从XML中得到图象"
'
'PictureBox1
'
Me.PictureBox1.Location = New System.Drawing.Point(18, 6)
Me.PictureBox1.Name = "PictureBox1"
Me.PictureBox1.Size = New System.Drawing.Size(320, 460)
Me.PictureBox1.TabIndex = 2
Me.PictureBox1.TabStop = False
'
'Button3
'
Me.Button3.Location = New System.Drawing.Point(365, 28)
Me.Button3.Name = "Button3"
Me.Button3.Size = New System.Drawing.Size(115, 23)
Me.Button3.TabIndex = 3
Me.Button3.Text = "浏览图片…"
'
'Label1
'
Me.Label1.Location = New System.Drawing.Point(369, 135)
Me.Label1.Name = "Label1"
Me.Label1.Size = New System.Drawing.Size(105, 95)
Me.Label1.TabIndex = 4
'
'Label2
'
Me.Label2.Location = New System.Drawing.Point(367, 437)
Me.Label2.Name = "Label2"
Me.Label2.Size = New System.Drawing.Size(130, 16)
Me.Label2.TabIndex = 5
Me.Label2.Text = "【孟宪会之精彩世界】"
'
'Form1
'
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(500, 480)
Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.Label2, Me.Label1, Me.Button3, Me.PictureBox1, Me.Button2, Me.Button1})
Me.Name = "Form1"
Me.Text = "图象文件和XML格式文件互换例子"
Me.ResumeLayout(False)
End Sub
#End Region
Private MyFile As String = ""
Private MyFileExt As String = ""
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) _
Handles Button2.Click
Dim pic As String
Dim MyXml As System.Xml.XmlDocument = New System.Xml.XmlDocument()
MyXml.Load("c:\MyPhoto.xml")
Dim picNode As System.Xml.XmlNode
picNode = MyXml.SelectSingleNode("/pic/photo")
pic = picNode.InnerText
Dim memoryStream As System.IO.MemoryStream
memoryStream = New System.IO.MemoryStream(Convert.FromBase64String(pic))
Me.PictureBox1.Image = New System.Drawing.Bitmap(memoryStream)
memoryStream.Close()
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) _
Handles Button1.Click
If MyFile = "" Then
MessageBox.Show("请选择一个图片！", "错误", MessageBoxButtons.OK, MessageBoxIcon.Warning)
Exit Sub
End If
Dim MyImg As System.Drawing.Image = MyImg.FromFile(MyFile)
Dim memoryStream As System.IO.MemoryStream = New System.IO.MemoryStream()
MyImg.Save(memoryStream, GetImageType(MyFileExt))
Dim b() As Byte
b = memoryStream.GetBuffer()
Dim pic As String = Convert.ToBase64String(b)
memoryStream.Close()
Dim MyXml As System.Xml.XmlDocument = New System.Xml.XmlDocument()
MyXml.LoadXml("<p><div align="center">本内容共<span style="color:red">2</span>页 首 页 上一页 <a href="101957837_2.html">下一页</a> <a href="101957837_2.html">尾 页</a> 当前在第<span style="color:red">1</span>页</div></p></div>
</div>
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<form method="get" action="http://www.google.cn/custom" target="google_window">
<table border="0" bgcolor="#ffffff">
<tr><td nowrap="nowrap" valign="top" align="left" height="32">
<a href="http://www.google.com/">
<img src="http://www.google.com/logos/Logo_25wht.gif" border="0" alt="Google" align="middle"></img></a>
</td>
<td nowrap="nowrap">
<input type="hidden" name="domains" value="www.cqxw.net"></input>
<input type="text" name="q" size="64" maxlength="255" value=""></input>
<input type="submit" name="sa" value="搜索"></input>
</td></tr>
<tr>
<td> </td>
<td nowrap="nowrap">
<table>
<tr>
<td>
<input type="radio" name="sitesearch" value=""></input>
<font size="-1" color="#000000">Web</font>
</td>
<td>
<input type="radio" name="sitesearch" value="www.cqxw.net" checked="checked"></input>
<font size="-1" color="#000000">www.cqxw.net</font>
</td>
</tr>
</table>
<input type="hidden" name="client" value="pub-7049110951060221"></input>
<input type="hidden" name="forid" value="1"></input>
<input type="hidden" name="ie" value="GB2312"></input>
<input type="hidden" name="oe" value="GB2312"></input>
<input type="hidden" name="cof" value="GALT:#008000;GL:1;DIV:#336699;VLC:663399;AH:center;BGC:FFFFFF;LBGC:FFFFFF;ALC:0000FF;LC:0000FF;T:000000;GFNT:0000FF;GIMP:0000FF;FORID:1"></input>
<input type="hidden" name="hl" value="zh-CN"></input>
</td></tr></table>
</form>
<!-- SiteSearch Google -->
</div>
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把图象文件转换成XML格式文件
利用.NET 框架下的FromBase64String和ToBase64String方法可以很容易地实现图象文件和XML文件的互换。这样可以轻易解决以XML格式保存图片的问题。代码如下：