Excel vba下载随机文件扩展名的文件
我试图写一个代码来自动从Excel网站下载文件的文件。 我知道有很多关于这个话题的post，但到目前为止没有运气。 前几行代码如下所示：
Sub testing() Dim ie as object Url _base = "http://www..../download.aspx?id=" Num = cells(1,1).value Set ie = createobject ("internetexplorer.application") Ie.visible = true For i = 1 to num Url = url _base & i .... 然后我变得无能为力 问题是winhttp似乎只能下载csv文件，而urldownloadtofile则需要一个以文件扩展名结尾的可靠的urlpath。 然而，我的情况是链接redirect到实际的文件位置（没有扩展名显示），也可以是任何扩展名，如PDF，JPG和DOC。
感谢所有提前！
好的，编辑答案折叠反馈，三种不同的方式来发出HTTP请求，似乎你正在寻找陷阱的状态代码300-303,307-308的redirect。 尝试这一点，并提供有关您是否被redirect的反馈。
Option Explicit Private Sub TestGetFileFromWeb() Call SaveTextToFile(GetFileFromWeb2("http://www.wikipedia.com"), "c:\temp\wikipedia2.txt") Call SaveTextToFile(GetFileFromWeb3("http://www.wikipedia.com"), "c:\temp\wikipedia3.txt") '* placed last because it gives "Access Denied" Run-time error '-2147024891 &h80070005 'Call SaveTextToFile(GetFileFromWeb1("http://www.wikipedia.com"), "c:\temp\wikipedia1.txt") Call SaveTextToFile(GetFileFromWeb1("http://www.bbc.com"), "c:\temp\bbc.txt") End Sub Private Function SaveTextToFile(ByRef sText As String, ByVal sFileName As String) As Boolean '* Requires Tools ->References -> Microsoft Scripting Runtime Dim fso As Scripting.FileSystemObject Set fso = New Scripting.FileSystemObject Dim txtOut As Scripting.TextStream Set txtOut = fso.CreateTextFile(sFileName, , True) txtOut.Write sText txtOut.Close Set txtOut = Nothing Set fso = Nothing SaveTextToFile = True End Function Private Function GetFileFromWeb1(ByVal sURL As String) As String '* Requires Tools->References->Microsoft Xml, v.6.0 Dim xHTTPRequest As MSXML2.XMLHTTP60 Set xHTTPRequest = New MSXML2.XMLHTTP60 xHTTPRequest.Open "GET", sURL, False xHTTPRequest.Send Debug.Assert WasRedirected(xHTTPRequest.Status) GetFileFromWeb1 = xHTTPRequest.ResponseText End Function Private Function GetFileFromWeb2(ByVal sURL As String) As String '* Requires Tools->References->Microsoft WinHTTP Services, version 5.1 Dim oWinHttp As WinHttp.WinHttpRequest Set oWinHttp = New WinHttp.WinHttpRequest oWinHttp.Open "GET", sURL, False oWinHttp.Send Debug.Assert WasRedirected(oWinHttp.Status) GetFileFromWeb2 = oWinHttp.ResponseText End Function Private Function WasRedirected(ByVal lStatus As Long) As Boolean 'http://qnimate.com/redirection-and-duplicate-content-in-websites/ 'There are many types of HTTP redirection. ' '300 Redirect or Multiple Choices '301 Redirect or permanent redirect '302 Redirect or Found or Temporary Redirect '303 Redirect or See Other '307 Redirect or Temporary Redirect '308 Redirect or Permanent Redirect 'HTTP refresh header WasRedirected = (lStatus = 300 Or lStatus = 301 Or lStatus = 302 Or lStatus = 303 Or lStatus = 307 Or lStatus = 308) End Function Private Function GetFileFromWeb3(ByVal sURL As String) As String '* Requires Tools->References->Microsoft Xml, v.6.0 Dim xHTTPRequest As MSXML2.ServerXMLHTTP60 Set xHTTPRequest = New MSXML2.ServerXMLHTTP60 xHTTPRequest.Open "GET", sURL, False xHTTPRequest.Send Debug.Assert WasRedirected(xHTTPRequest.Status) GetFileFromWeb3 = xHTTPRequest.ResponseText End Function