Question

我有以下VBA代码，它打算从网上下载文件，给我一条消息“从...下载数据”，并在下载后立即给我一条消息“Downloaded to ...”。这是我的代码：

Sub DownloadFileFromWeb()
Dim IE As Object
Dim links As Variant, lnk As Variant
Dim download_path As String
download_path = "\\xxxxx\Save Raw File here.xls"
Set IE = CreateObject("InternetExplorer.Application")
IE.Navigate "http://www.hkma.gov.hk/eng/market-data-and-statistics/monthly-statistical-bulletin/table.shtml#section2" 'load web page
While IE.Busy
  DoEvents  'wait until IE is done loading page.
Wend
Set links = IE.document.getElementsByTagName("a")
For Each lnk In links
     If Len(lnk.href) > 4 And Right(lnk.href, 4) = ".xls" And InStr(1, lnk.href, "http://www.hkma.gov.hk/media/eng/doc/market-data-and-statistics/monthly-statistical-bulletin/T080102.xls") <> 0 Then
            MsgBox "Downloading Data from " & lnk.href
            Download_File lnk.href, download_path
            MsgBox "Downloaded to - " & download_path
            Exit For
     End If
Next
End Sub

Function Download_File(ByVal vWebFile As String, ByVal vLocalFile As String) As Boolean
Dim oXMLHTTP As Object, i As Long, vFF As Long, oResp() As Byte

Set oXMLHTTP = CreateObject("MSXML2.XMLHTTP")
oXMLHTTP.Open "GET", vWebFile, False 'Open socket to get the website
oXMLHTTP.Send 'send request

'Wait for request to finish
Do While oXMLHTTP.readyState <> 4
DoEvents
Loop

oResp = oXMLHTTP.responseBody 'Returns the results as a byte array

'Create local file and save results to it
vFF = FreeFile
If Dir(vLocalFile) <> "" Then Kill vLocalFile
Open vLocalFile For Binary As #vFF
Put #vFF, , oResp
Close #vFF

'Clear memory
Set oXMLHTTP = Nothing
End Function

我遇到的问题是，大多数时候我都不会出现任何消息框，同时也没有下载任何内容。你能不能一直帮助我，以便一直得到消息框？

非常感谢！

Answer 1

在我的头上测试你的代码，我看不到任何错误。我已经下载了一百次，它没有破坏。但是，我做了一些小修改。

将主子程序更改为以下内容：

Sub DownloadFileFromWeb()
Dim IE As Object
Dim links As Variant, lnk As Variant
Dim download_path As String
download_path = "C:\...\SavedFile.xls" 'Modify.
Set IE = CreateObject("InternetExplorer.Application")
IE.Navigate "http://www.hkma.gov.hk/eng/market-data-and-statistics/monthly-statistical-bulletin/table.shtml#section8" 'load web page
While IE.Busy
  DoEvents  'wait until IE is done loading page.
Wend
Set links = IE.document.getElementsByTagName("a")
For Each lnk In links
     If Len(lnk.href) > 4 And Right(lnk.href, 4) = ".xls" And InStr(1, lnk.href, "T080102.xls") <> 0 Then
            If MsgBox("Downloading Data from " & lnk.href, vbOKOnly) = vbOK Then
                Download_File lnk.href, download_path
                MsgBox "Downloaded to - " & download_path
                Exit For
            End If
     End If
Next
End Sub

基本上，我只更改了一件事：消息框会在下载文件之前等待您的输入。请注意我是如何做If MsgBox(...) = vbOKOnly的。这样，它将等待您的输入而不是中断。

对URL进行微小更改。已将section2更改为section8，因为这是您想要的表格（不会影响任何内容，恕我直言）。

如果有帮助，请告诉我们。

消息框并不总是可见

1 个答案: