VB及VBA下载网上文件代码且有进度条显示

2017-09-20 21:35:00
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'添加 internet transfer control 6.0 和 windows commom controls 6.0
'form代码:

Private Sub cmdGET_Click()
StartDownLoad txtURL
End Sub

Private Sub Form_Load()
savefile.Text = App.Path
End Sub

Private Sub StartDownLoad(ByVal Geturl As String)
Dim spo%, filename$
Dim fso, f
Set fso = CreateObject("Scripting.FileSystemObject")
If Not fso.FolderExists(App.Path & "\download") Then Set f = fso.CreateFolder(App.Path & "\download")
spo = InStrRev(Geturl, "/")
filename = Right(Geturl, Len(Geturl) - spo) '获取文件名
savefile.Text = App.Path & "\download" & filename
Inet1.Execute Geturl, "get"   '开始下载
End Sub

Private Sub Inet1_StateChanged(ByVal State As Integer)
'State = 12 时,用 GetChunk 方法检索服务器的响应。
Dim vtData() As Byte
Select Case State
'...没有列举其它情况。
Case icError '11
'出现错误时,返回 ResponseCode 和 ResponseInfo。
vtData = Inet1.ResponseCode & ":" & Inet1.ResponseInfo
Case icResponseCompleted ' 12
Dim bDone As Boolean: bDone = False
'取得第一个块。
vtData() = Inet1.GetChunk(1024, 1)
DoEvents
Open savefile.Text For Binary Access Write As #1     '设置保存路径文件后开始保存
'获取下载文件长度
If Len(Inet1.GetHeader("Content-Length")) > 0 Then ProgressBar1.Max = CLng(Inet1.GetHeader("Content-Length"))

'循环分块下载
Do While Not bDone
Put #1, Loc(1) + 1, vtData()
vtData() = Inet1.GetChunk(1024, 1)
DoEvents
ProgressBar1.Value = Loc(1)   '设置进度条长度
If Loc(1) >= ProgressBar1.Max Then bDone = True
Loop

Close #1
MsgBox "下载完成", vbInformation, "通知"
End Select

End Sub
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