HtmlAgilityPack + Vb +尝试获取图片

Question

我有当前代码以获取标题和图片。标题位于一个文本框中，图片位于一个图片框中。

在我的Windows窗体中，我有：

Imports System
Imports System.Xml
Imports HtmlAgilityPack
Imports System.Net
Imports System.IO
Imports System.Collections.Generic

在测试的加载页面中，我有：

Public Class scrapper
    Private Sub scrapper_Load(sender As Object, e As EventArgs) Handles MyBase.Load

        'Enable SSL Suppport'
        ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12
        'WebPage to Scrapping'
        Dim link As String = "https://www.nextinpact.com/"
        'download page from the link into an HtmlDocument'
        Dim doc As HtmlDocument = New HtmlWeb().Load(link)
        'select the title'
        Dim div As HtmlNode = doc.DocumentNode.SelectSingleNode("/html/body/div[1]/div[2]/section/aside/section/div[2]/div/article[1]/div/div/h3/a")
        'select the image'
        Dim img As HtmlNode = doc.DocumentNode.SelectSingleNode("/html/body/div[1]/div[2]/div/div[1]/div[5]/div/div[2]/p[1]/a/img")

        If Not div Is Nothing Then
            TextBox1.Text = div.InnerText.Trim()
        End If

        If Not img Is Nothing Then
            'PictureBox1.Load(img.OuterHtml.Trim())
        End If
        'Test Picturebox2
        PictureBox2.Load("https://cdn2.nextinpact.com/compress/100-76//images/bd/square-linked-media/23647.jpg")

    End Sub

End Class

但是在PictureBox1中我无法获取图片。

在Picture2中，仅用于测试。

如何正确获取Picturebox1的图片？

Answer 1

然后，只需从元素获取URL。

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
    Dim doc As HtmlDocument = New HtmlWeb().Load("https://www.nextinpact.com/")
    PictureBox1.LoadAsync(doc.DocumentNode.SelectSingleNode("//div[@id='list_news']//img").Attributes("data-frz-src").Value)
End Sub

类似。

Answer 2

如果您尝试提取与PictureBox2中显示的图像相同的图像，则第二个SelectSingleNode上的XPath不正确。我会改用这些：

'select the title'
Dim div As HtmlNode = doc.DocumentNode.SelectSingleNode("//aside[@id='sideBarIndex']//article//div/div/h3/a")
'select the image'
Dim img As HtmlNode = doc.DocumentNode.SelectSingleNode("//aside[@id='sideBarIndex']//article//img")