从 FTP url 下载 VBA 文件

Question

我正在尝试创建 VBA 代码以从直接 FTP 链接（异步首选）将文件下载到特定路径。 我只找到了使它与 http url 一起工作的代码，但是对于 FTP 我得到了这个错误：

“运行时错误'-2146697210 (800c0006)': 系统找不到指定的对象”

对于这些第一次测试还没有为 ftp-server 设置用户名或密码。

仅适用于 http 的代码如下：

Sub DownloadFile()

Dim myURL As String
myURL = "ftp://xxx.xxx.xxx.xxx/test.txt"

Dim WinHttpReq As Object
Set WinHttpReq = CreateObject("Microsoft.XMLHTTP")
WinHttpReq.Open "GET", myURL, False, "username", "password"
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 "C:\FTP\file.txt", 2 ' 1 = no overwrite, 2 = overwrite
    oStream.Close
End If

End Sub

Answer 1

您需要在项目中添加一个模块才能获得 FTP 功能。子 FTP 下载有示例代码。取自http://experts-exchange.com/Networking/Protocols/Q_23627204.html

Private Const FTP_TRANSFER_TYPE_UNKNOWN     As Long = 0
Private Const INTERNET_FLAG_RELOAD          As Long = &H80000000

Private Declare Function InternetOpenA Lib "wininet.dll" ( _
    ByVal sAgent As String, _
    ByVal lAccessType As Long, _
    ByVal sProxyName As String, _
    ByVal sProxyBypass As String, _
    ByVal lFlags As Long) As Long

Private Declare Function InternetConnectA Lib "wininet.dll" ( _
    ByVal hInternetSession As Long, _
    ByVal sServerName As String, _
    ByVal nServerPort As Long, _
    ByVal sUsername As String, _
    ByVal sPassword As String, _
    ByVal lService As Long, _
    ByVal lFlags As Long, _
    ByVal lcontext As Long) As Long

Private Declare Function FtpGetFileA Lib "wininet.dll" ( _
    ByVal hConnect As Long, _
    ByVal lpszRemoteFile As String, _
    ByVal lpszNewFile As String, _
    ByVal fFailIfExists As Long, _
    ByVal dwFlagsAndAttributes As Long, _
    ByVal dwFlags As Long, _
    ByVal dwContext As Long) As Long

Private Declare Function InternetCloseHandle Lib "wininet" ( _
    ByVal hInet As Long) As Long


Sub FtpDownload(ByVal strRemoteFile As String, ByVal strLocalFile As String, ByVal strHost As String, ByVal lngPort As Long, ByVal strUser As String, ByVal strPass As String)
    'usage
    'FtpDownload "/TEST/test.html", "c:\test.html", "ftp.server.com", 21, "user", "password"
    Dim hOpen   As Long
    Dim hConn   As Long

    hOpen = InternetOpenA("FTPGET", 1, vbNullString, vbNullString, 1)
    hConn = InternetConnectA(hOpen, strHost, lngPort, strUser, strPass, 1, 0, 2)

    If FtpGetFileA(hConn, strRemoteFile, strLocalFile, 1, 0, FTP_TRANSFER_TYPE_UNKNOWN Or INTERNET_FLAG_RELOAD, 0) Then
        Debug.Print "done"
    Else
        Debug.Print "fail"
    End If

    InternetCloseHandle hConn
    InternetCloseHandle hOpen

End Sub