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Using the FileDownload Event of the IE object

I am currently using a combination of delays and error checks to handle the variable delay between the submission of data to a form and the availability of the File Download dialog box in an automated instance of Internet Explorer. If possible, I would like to replace the delays between the ".Click" and AppActivate"FileDownload" statements in the code fragment shown below by using the FileDownload Event. Can the trial-and-error method shown below be replaced by using the FileDownload Event to indicate the availability of the download dialog window prior to executing the AppActivate statement, and if so, how should it be done?


------------code fragment begins------------------------

Ie.Document.All.Item(400).Click            'submit form data for file download

'short timer, less than one second pause to allow filedownload window to load
tdelay = 5   ' equivalent to .5 seconds
tstart = Timer
Do While 10 * (Timer - tstart) < tdelay
    DoEvents    ' Yield to other processes.

On Error Resume Next                    
AppActivate "File Download"            'first file download window access attempt

If Err.Number <> 0 Then                           'additional  download window access attempts at 1 second intervals
dcount = 0
Do Until Err.Number = 0 Or dcount = 5      'timeout after success or 5 failures
Err.Number = 0
t = DateAdd("s", 1, Now)
Do Until Now > t
On Error Resume Next
AppActivate "File Download"
dcount = dcount + 1
End If

------------code fragment ends------------------------
1 Solution
FileDownload() event is raised prior to the window being shown so you still need to wait anyways. The delays will very greatly.. mainly due to the speeds of different computers.

Here's another method. It covers the main scenario.

Option Explicit

Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Private Declare Function FindWindowEx Lib "user32" Alias "FindWindowExA" (ByVal hWnd1 As Long, ByVal hWnd2 As Long, ByVal lpsz1 As String, ByVal lpsz2 As String) As Long
Private Declare Function GetWindow Lib "user32" (ByVal hwnd As Long, ByVal wCmd As Long) As Long
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long
Private Declare Function SetForegroundWindow Lib "user32" (ByVal hwnd As Long) As Long

Private Const BM_CLICK = &HF5
Private Const GW_HWNDFIRST = 0
Private Const GW_HWNDNEXT = 2
Private Const WM_GETTEXT = &HD
Private Sub Form_Load()
    Dim lngHandle As Long, lngTemp As Long
    'just browse to test site and wait for it to load...
    Call WebBrowser1.Navigate("http://www.mirc.com/get.html")
    Do Until WebBrowser1.ReadyState = READYSTATE_COMPLETE
    'click on link to download...
    'wait for "File Download" window to appear...
    Do Until lngHandle <> 0
        lngHandle = FindWindow(vbNullString, "File Download")
    'find the 2nd "File Download" window (the one with "Save")...
    lngHandle = GetWindow(lngHandle, GW_HWNDFIRST)
    Do Until lngHandle = 0
        lngHandle = GetWindow(lngHandle, GW_HWNDNEXT)
        If GetWindowText(lngHandle) = "File Download" Then
            If FindWindowEx(lngHandle, 0, vbNullString, "&Save") <> 0 Then
                lngHandle = FindWindowEx(lngHandle, 0, vbNullString, "&Save")
                Exit Do
            End If
        End If
    If lngHandle <> 0 Then
        'click on "Save"...
        Call SendMessage(lngHandle, BM_CLICK, 0, 0)
        'wait for "Save As" window to show...
            lngHandle = FindWindow(vbNullString, "Save As")
        Loop Until lngHandle <> 0
        If lngHandle <> 0 Then
            'ok.. that's the main part.. I'll just use a quick way to
            'finish up
            Call SetForegroundWindow(lngHandle)
            Call SendKeys("c:\test.exe", 1000)
            Call SendKeys("{ENTER}", 1000)
        End If
    End If
End Sub
Private Function GetWindowText(ByVal lngHandle As Long) As String
    Dim strBuff As String, lngLen As Long
    lngLen = SendMessage(lngHandle, WM_GETTEXTLENGTH, 0, 0) + 1
    strBuff = Space(lngLen)
    Call SendMessage(lngHandle, WM_GETTEXT, ByVal lngLen, ByVal strBuff)
    GetWindowText = Left(strBuff, lngLen - 1)
End Function
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