程序的主角是一个ActiveX控件:WebBrowser。当然,缺省状态下VB的工具箱中并没有它,我们得手工加入,方法是:右击工具箱,在出现的快捷菜单中选择“部件...”,确保在弹出的对话框中选中“控件”标签,找到Microsoft
Internet
Controls,在它前面的小框中打钩,然后确定。此时你会发现工具箱中多了两个小图标,其中,地球图标代表的控件正是我们需要的WebBrowser。
3.ProgressChange
WebBrowser控件跟踪下载操作的过程,并定期触发此事件。其语法为:Sub WebBrowser_ProgressChange (ByVal
Progress As Long, ByVal ProgressMax As
Long)。Progress变元是当前已下载的数据总量,ProgressMax变元是将要下载的数据总量。
4.TitleChange
当前文档标题改变时触发
除了WebBrowser控件外,程序还需要一个Label控件:Label1;一个ComboBox控件:combo1,用来显示URL地址;一个StatusBar控件:StatusBar1;一个ProgressBar控件:ProgressBar1,用来显示下载进度(StatusBar控件和ProgressBar控件是ActiveX控件Microsoft
Windows Common
Controls5.0的成员,加入工具箱的方法同WebBrowser控件),这些控件的属性值都用缺省值。
Private Sub Form_Resize() On Error GoTo a Combo1.Width
= Form1.Width - 100 WebBrowser1.Width =
Combo1.Width WebBrowser1.Height = Form1.Height - Combo1.Height -
1000 ProgressBar1.Top = Me.Height - StatusBar1.Height -
330 ProgressBar1.Left = 0.25 *
StatusBar1.Width ProgressBar1.Width = 0.75 * Me.Width -
250 a: End Sub
Private Sub Combo1_Click() `转到指定网址 WebBrowser1.Navigate
Combo1.Text End Sub
Private Sub Combo1_KeyDown(KeyCode As
Integer, Shift As Integer) Dim I As Long Dim existed As
Boolean If KeyCode = 13 Then If Left(Combo1.Text, 7) <>
“http://”Then Combo1.Text = “http://”+ Combo1.Text End
If WebBrowser1.Navigate Combo1.Text For I = 0 To
Combo1.ListCount - 1 If Combo1.List(I) = Combo1.Text
Then existed = True Exit For Else existed =
False End If Next If Not existed Then Combo1.AddItem
(Combo1.Text) End If End If End
Sub
Private Sub WebBrowser1_DownloadBegin() `下载开始时状态栏显示“Now
Linking...” StatusBar1.SimpleText = “Now Linking...” End
Sub
Private Sub WebBrowser1_DownloadComplete() `下载完成时状态栏显示“Link
Finished” StatusBar1.SimpleText = “Link
Finished” ProgressBar1.Value = 0 End
Sub
Private Sub WebBrowser1_ProgressChange(ByVal Progress As
Long, ByVal ProgressMax As Long) `下载进行时进度条变化 If ProgressMax =
0 Then Exit Sub ProgressBar1.Max = ProgressMax If Progress
<> -1 And Progress <= ProgressMax Then ProgressBar1.Value =
Progress End If End Sub
Private Sub WebBrowser1_TitleChange(ByVal Text As
String) Combo1.Text = WebBrowser1.LocationURL End Sub
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