希望有人可以提供帮助,因为我花了很多时间试图解决这个问题。我正在使用敏捷包从表中提取数据并将其放入数据网格中(数据网格并不重要,我只是使用它来查看提取是否有效)。无论如何,在表格的第一列中包含缩略图。我可以使用下面的代码提取所有文本,但我不知道如何从第一列中提取图像......任何人都可以帮忙吗?
PS我已将网页保存为MHL文件,因为无法直接从中提取任何数据 - 我认为这与网站安全/凭据有关。不知道我是否让自己变得更容易或更难。
Private Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Button1.Click
' '' original cods ***************************************
Dim Web As New HtmlAgilityPack.HtmlWeb
Dim Doc As New HtmlAgilityPack.HtmlDocument
Dim RowCount As Integer = 1
' Doc = Web.Load("https://firefly.cardinalnewman.ac.uk/home/my")
Doc.Load("E:\table.mht")
Dim tables As HtmlAgilityPack.HtmlNodeCollection = Doc.DocumentNode.SelectNodes("//table")
Dim img As HtmlAgilityPack.HtmlNodeCollection = Doc.DocumentNode.SelectNodes("//table")
Dim Links As HtmlAgilityPack.HtmlNodeCollection = Doc.DocumentNode.SelectNodes("//table")
Dim rows As HtmlAgilityPack.HtmlNodeCollection = tables(0).SelectNodes("//*[@id=HomeMyStudents]")
For Each table As HtmlAgilityPack.HtmlNode In Doc.DocumentNode.SelectNodes("//*[@id='HomeMyStudents']/tbody/tr['RowCount']/td[1]")
RowCount = RowCount + 1
DGV.Rows.Add(Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing)
Next
RowCount = 0
For Each table As HtmlAgilityPack.HtmlNode In Doc.DocumentNode.SelectNodes("//*[@id='HomeMyStudents']/tbody/tr['RowCount']/td[2]")
RowCount = RowCount + 1
' DGV.Rows(RowCount).Cells(1).Value = somehow insert image
' this is the section where I need to grab the image in each cell and either save or place in my datagrid
Next
RowCount = 0
For Each table As HtmlAgilityPack.HtmlNode In Doc.DocumentNode.SelectNodes("//*[@id='HomeMyStudents']/tbody/tr['RowCount']/td[3]")
RowCount = RowCount + 1
DGV.Rows(RowCount).Cells(2).Value = table.InnerText
Next
RowCount = 0
For Each table As HtmlAgilityPack.HtmlNode In Doc.DocumentNode.SelectNodes("//*[@id='HomeMyStudents']/tbody/tr['RowCount']/td[4]")
RowCount = RowCount + 1
DGV.Rows(RowCount).Cells(3).Value = table.InnerText
Next
RowCount = 0
For Each table As HtmlAgilityPack.HtmlNode In Doc.DocumentNode.SelectNodes("//*[@id='HomeMyStudents']/tbody/tr['RowCount']/td[5]")
RowCount = RowCount + 1
DGV.Rows(RowCount).Cells(4).Value = table.InnerText
Next
RowCount = 0
For Each table As HtmlAgilityPack.HtmlNode In Doc.DocumentNode.SelectNodes("//*[@id='HomeMyStudents']/tbody/tr['RowCount']/td[6]")
RowCount = RowCount + 1
DGV.Rows(RowCount).Cells(5).Value = table.InnerText
Next
RowCount = 0
For Each table As HtmlAgilityPack.HtmlNode In Doc.DocumentNode.SelectNodes("//*[@id='HomeMyStudents']/tbody/tr['RowCount']/td[7]")
RowCount = RowCount + 1
DGV.Rows(RowCount).Cells(6).Value = table.InnerText
Next
RowCount = 0
For Each table As HtmlAgilityPack.HtmlNode In Doc.DocumentNode.SelectNodes("//*[@id='HomeMyStudents']/tbody/tr['RowCount']/td[8]")
RowCount = RowCount + 1
DGV.Rows(RowCount).Cells(7).Value = table.InnerText
Next
RowCount = 0
For Each table As HtmlAgilityPack.HtmlNode In Doc.DocumentNode.SelectNodes("//*[@id='HomeMyStudents']/tbody/tr['RowCount']/td[9]")
RowCount = RowCount + 1
DGV.Rows(RowCount).Cells(8).Value = table.InnerText
Next
RowCount = 0
For Each table As HtmlAgilityPack.HtmlNode In Doc.DocumentNode.SelectNodes("//*[@id='HomeMyStudents']/tbody/tr['RowCount']/td[10]")
RowCount = RowCount + 1
DGV.Rows(RowCount).Cells(9).Value = table.InnerText
Next
RowCount = 0
For Each table As HtmlAgilityPack.HtmlNode In Doc.DocumentNode.SelectNodes("//*[@id='HomeMyStudents']/tbody/tr['RowCount']/td[11]")
RowCount = RowCount + 1
DGV.Rows(RowCount).Cells(10).Value = table.InnerText
Next
End Sub
答案 0 :(得分:0)
所以,大概这些图像看起来像是:
<img src="whatever.jpg"/>
在标记中,对吗?
HAP将允许您使用类似
的内容来抓取图像节点... .SelectNodes("./img")
对于路径:
... .Attributes("src").Value()
从那时起,我不知道任何特定的HAP功能允许您实际执行这样的任何HTTP请求,因此您将需要WebClient。
Dim wc as new WebClient
wc.DownloadFile(StringContainingThatSrcValue, PathToSaveFileTo)
HTH!