使用Excel VBA从网站上刮取文字？

Question

我很擅长使用Excel作为网页抓取工具,但我发现这篇非常有趣的文章解释了如何使用Excel VBA从网站上抓取某些标签.我有下面的代码工作正常,但它只从<p>它找到的第一个标签获取内容:

Sub get_title_header()
Dim wb As Object
Dim doc As Object
Dim sURL As String
Dim lastrow As Long
lastrow = Sheet1.Cells(Rows.Count, "A").End(xlUp).Row

For i = 2 To lastrow
    Set wb = CreateObject("internetExplorer.Application")
    sURL = Cells(i, 1)

    wb.navigate sURL
    wb.Visible = True

    While wb.Busy
        DoEvents
    Wend

    'HTML document
    Set doc = wb.document

    Cells(i, 2) = doc.title

    On Error GoTo err_clear
    Cells(i, 3) = doc.GetElementsByTagName("p")(0).innerText
    err_clear:
    If Err <> 0 Then
        Err.Clear
        Resume Next
    End If
    wb.Quit
    Range(Cells(i, 1), Cells(i, 3)).Columns.AutoFit
Next i

End Sub

现在我想做的是调整代码并让刮刀获取<p>网页上的所有内容.所以我猜想foreach缺少某种功能.

希望有人愿意帮助我扩展代码,以便<p>收集来自多个标签的内容.

更新 工作代码下方!

Sub get_title_header()
Dim wb As Object
Dim doc As Object
Dim sURL As String
Dim lastrow As Long
Dim i As Integer
lastrow = Sheet1.Cells(Rows.Count, "A").End(xlUp).Row

For i = 2 To lastrow
    Set wb = CreateObject("internetExplorer.Application")
    sURL = Cells(i, 1)

    wb.navigate sURL
    wb.Visible = True

    While wb.Busy
        DoEvents
    Wend

    'HTML document
    Set doc = wb.document

    Cells(i, 2) = doc.Title

    On Error GoTo err_clear

    Dim el As Object
    For Each el In doc.GetElementsByTagName("p")

        counter = counter + 1
        Cells(i, counter + 2).Value = Cells(counter + 1).Value & el.innerText

    Next el
    counter = 0

    err_clear:
    If Err <> 0 Then
        Err.Clear
        Resume Next
    End If
    wb.Quit
    Range(Cells(i, 1), Cells(i, 10)).Columns.AutoFit
Next i

End Sub

Answer 1

你快到了! doc.GetElementsByTagName("p")返回使用HTMLParagraphElement您访问第一个条目的对象集合doc.GetElementsByTagName("p")(0).正如您所提到的,For Each循环可以让您依次访问每个循环:

Sub get_title_header()
Dim wb As Object
Dim doc As Object
Dim sURL As String
Dim lastrow As Long
Dim i As Integer
lastrow = Sheet1.Cells(Rows.Count, "A").End(xlUp).Row

For i = 2 To lastrow
Set wb = CreateObject("internetExplorer.Application")
sURL = Cells(i, 1)

wb.navigate sURL
wb.Visible = True

While wb.Busy
    DoEvents
Wend

'HTML document
Set doc = wb.document

Cells(i, 2) = doc.Title

On Error GoTo err_clear

Dim el As Object
For Each el In doc.GetElementsByTagName("p")
    Cells(i, 3).Value = Cells(i, 3).Value & ", " & el.innerText
Next el

err_clear:
If Err <> 0 Then
Err.Clear
Resume Next
End If
wb.Quit
Range(Cells(i, 1), Cells(i, 3)).Columns.AutoFit
Next i

End Sub