把圖象文件轉換成XML格式文件
利用.NET 框架下的FromBase64String和ToBase64String方法可以很容易地實現圖象文件和XML文件的互換。這樣可以輕易解決以XML格式保存圖片的問題。代碼如下：
Public Class Form1 Inherits System.Windows.Forms.Form
#Region " Windows 窗體設計器生成的代碼 " Public Sub New() MyBase.New() InitializeComponent() 在 InitializeComponent() 調用之后添加任何初始化 End Sub
窗體重寫處置以清理組件列表。 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 窗體設計器所必需的 Private components As System.ComponentModel.IContainer 注意：以下過程是 Windows 窗體設計器所必需的 可以使用 Windows 窗體設計器修改此過程。 不要使用代碼編輯器修改它。 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 = "將圖象保存成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 = "從XML中得到圖象"
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 = "瀏覽圖片…"
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 = "【孟憲會之精彩世界】"
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 = "圖象文件和XML格式文件互換例子" 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("請選擇一個圖片！", "錯誤", 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("pic>name>孟憲會/name>photo>" + pic + "/photo>/pic>") MyXml.Save("c:\MyPhoto.xml") Label1.Text = "文件被保存到了：" + Microsoft.VisualBasic.ChrW(13) + "c:\MyPhoto.xml" End Sub
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) _ Handles Button3.Click Dim openFileDialog1 As New OpenFileDialog() openFileDialog1.InitialDirectory = "c:\" openFileDialog1.Filter = "PNG(*.png)|*.png|Gif(*.gif)|*.gif|Jpg(*.jpg)|*.jpg|所有圖象文件(*.*)|*.*" openFileDialog1.FilterIndex = 2 openFileDialog1.RestoreDirectory = True If openFileDialog1.ShowDialog() = DialogResult.OK Then MyFile = openFileDialog1.FileName() MyFileExt = MyFile.Substring(MyFile.LastIndexOf(".") + 1) End If End Sub
Public Function GetImageType(ByVal str As String) As System.Drawing.Imaging.ImageFormat Select Case str.ToLower() Case "jpg" Return System.Drawing.Imaging.ImageFormat.Jpeg Case "gif" Return System.Drawing.Imaging.ImageFormat.Gif Case "tiff" Return System.Drawing.Imaging.ImageFormat.Tiff() Case "icon" Return System.Drawing.Imaging.ImageFormat.Icon Case "image/png" Return System.Drawing.Imaging.ImageFormat.Png Case Else Return System.Drawing.Imaging.ImageFormat.MemoryBmp End Select End Function
Private Sub Form1_Closing(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) _ Handles MyBase.Closing System.Diagnostics.Process.Start("IExplore.exe", "http://xml.sz.luohuedu.net/") End Sub End Class
