我需要从互联网上下载大量文件，所以我通过引用网络写了一个excel宏。但是现在我想从网站下载一些密码保护的文件，所以我应该如何改变我的代码以便它检查身份验证并在需要时提示用户名和密码？ 提前致谢 这是我的vba代码 Sub DownloadFiles（）
'Declaring the necessary variables.
Dim sh As Worksheet
Dim DownloadFolder As String
Dim LastRow As Long
Dim SpecialChar() As String
Dim SpecialCharFound As Double
Dim FilePath As String
Dim i As Long
Dim j As Integer
Dim Result As Long
Dim CountErrors As Long
Dim Username As String
Dim Password As String
Dim TextFile As Integer
Dim CFilePath As String
Dim Credentials As Variant
'Disable screen flickering.
Application.ScreenUpdating = False
'Set the worksheet object to the desired sheet.
Set sh = Sheets("Main")
'An array with special characters that cannot be used for naming a file.
SpecialChar() = Split("\ / : * ? " & Chr$(34) & " < > |", " ")
'Find the last row.
With sh
.Activate
LastRow = .Cells(.Rows.Count, "C").End(xlUp).Row
End With
'Check if the download folder exists.
DownloadFolder = sh.Range("B4")
On Error Resume Next
If Dir(DownloadFolder, vbDirectory) = vbNullString Then
MsgBox "The folder's path is incorrect!", vbCritical, "Folder's Path Error"
sh.Range("B4").Select
Exit Sub
End If
On Error GoTo 0
'Check if there is at least one URL.
If LastRow < 8 Then
MsgBox "You did't enter a single URL!", vbCritical, "No URL Error"
sh.Range("C8").Select
Exit Sub
End If
'Clear the results column.
sh.Range("E8:E" & LastRow).ClearContents
'Add the backslash if doesn't exist.
If Right(DownloadFolder, 1) <> "\" Then
DownloadFolder = DownloadFolder & "\"
End If
'Counting the number of files that will not be downloaded.
CountErrors = 0
'Save the internet files at the specified folder of your hard disk.
On Error Resume Next
For i = 8 To LastRow
'Use the given file name.
If Not sh.Cells(i, 4) = vbNullString Then
'Get the given file name.
FilePath = sh.Cells(i, 4)
'Check if the file path contains a special/illegal character.
For j = LBound(SpecialChar) To UBound(SpecialChar)
SpecialCharFound = InStr(1, FilePath, SpecialChar(j), vbTextCompare)
'If an illegal character is found substitute it with a "-" character.
If SpecialCharFound > 0 Then
FilePath = WorksheetFunction.Substitute(FilePath, SpecialChar(j), "-")
End If
Next j
'Create the final file path.
FilePath = DownloadFolder & FilePath
'Check if the file path exceeds the maximum allowable characters.
If Len(FilePath) > 255 Then
sh.Cells(i, 5) = "ERROR"
CountErrors = CountErrors + 1
End If
Else
'Empty file name.
sh.Cells(i, 5) = "ERROR"
CountErrors = CountErrors + 1
End If
'If the file path is valid, save the file into the selected folder.
If UCase(sh.Cells(i, 5)) <> "ERROR" Then
'Try to download and save the file.
Result = URLDownloadToFile(0, sh.Cells(i, 3), FilePath, 0, 0)
'Check if the file downloaded successfully and exists.
If Result = 0 And Not Dir(FilePath, vbDirectory) = vbNullString Then
'Success!
sh.Cells(i, 5) = "OK"
Else
'Error!
sh.Cells(i, 5) = "ERROR"
CountErrors = CountErrors + 1
End If
End If
Next i
On Error GoTo 0
'Enable the screen.
Application.ScreenUpdating = True
'Inform the user that macro finished successfully or with errors.
If CountErrors = 0 Then
'Success!
If LastRow - 7 = 1 Then
MsgBox "The file was successfully downloaded!", vbInformation, "Done"
Else
MsgBox LastRow - 7 & " files were successfully downloaded!", vbInformation, "Done"
End If
Else
'Error!
If CountErrors = 1 Then
MsgBox "There was an error with one of the files!", vbCritical, "Error"
Else
MsgBox "There was an error with " & CountErrors & " files!", vbCritical, "Error"
End If
End If
End Sub