Excel VBA HTTPSresource的URLDownloadToFile错误 [英] Excel VBA URLDownloadToFile Error for HTTPSresource

问题描述

我尝试使用VBA从Excel中的服务器下载文件.使用HTTP时，此方法工作正常，但使用HTTPS时，则无效.

I try to download a file from a Server in Excel using VBA. This works fine when using HTTP, but doesn't work using HTTPS.

我可以在Internet Explorer中同时访问两种地址(HTTP/HTTPS).如果我将URLDownloadToFile与HTTP地址一起使用，则会下载文件.

I can reach both adresses (HTTP/HTTPS) in Internet Explorer. If I use URLDownloadToFile with the HTTP address the file is downloaded.

使用HTTPSadress时，我得到返回码-2146697211.也许这是证书问题?

When using the HTTPSadress I get return code -2146697211. Maybe this a certificate Problem?

Private Declare Function URLDownloadToFile Lib "urlmon" _
Alias "URLDownloadToFileA" (ByVal pCaller As Long, _
ByVal szURL As String, ByVal szFileName As String, _
ByVal dwReserved As Long, ByVal lpfnCB As Long) As Long

Dim Ret As Long

Sub DownloadCode()

Dim strURL As String
Dim strPath As String
strURL = "https:/url.de/module.bas"
strPath = Environ("TEMP") & "\Module.bas"
Ret = URLDownloadToFile(0, strURL, strPath, 0, 0)

If Ret = 0 Then
'   MsgBox "File successfully downloaded"
Else
    MsgBox "Returncode:" & Ret & " Unable to download Code`enter code here`."
End If

End Sub

推荐答案

如果其他人遇到此问题:对我而言，问题是服务器期望客户端证书.通常，https调用在VB中是没有问题的.对于自签名证书，必须从文件系统或Windows证书存储发送证书.

If anybody else has this Problem: The Problem for me was, that the Server expected a Client Certificate. Normally https calls are no Problem from VB. For self signed certs, one has to send a certificate from file System or Windows cert store.

Dim oStream As Object
Dim myURL As String

myURL = "URL"

Dim WinHttpReq As Object
Set WinHttpReq = CreateObject("WinHttp.WinHttpRequest.5.1")
WinHttpReq.Option(4) = 13056 ' Ignore SSL Errors

WinHttpReq.Open "GET", myURL, False

'Grab Cert from Windows Cert Store
'WinHttpReq.SetClientCertificate "CURRENT_USER\Root\CERTI"

WinHttpReq.setRequestHeader "Accept", "*/*"
WinHttpReq.setRequestHeader "User-Agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)"
WinHttpReq.setRequestHeader "Proxy-Connection", "Keep-Alive"
WinHttpReq.Send

myURL = WinHttpReq.ResponseBody

If WinHttpReq.Status = 200 Then
    Set oStream = CreateObject("ADODB.Stream")
    oStream.Open
    oStream.Type = 1
    oStream.Write WinHttpReq.ResponseBody
    oStream.SaveToFile Environ("TEMP") & "\File", 2
    oStream.Close
Else
    MsgBox "Returncode:" & WinHttpReq.Status & " Unable to download  Code."
End If

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