如何在图片框中预览URL缩略图

本文关键字：URL 略图 | 更新日期: 2023-09-27 17:49:44

我想在图片框中显示url的缩略图。这是我正在尝试的代码

var request = WebRequest.Create("http://www.facebook.com");
using (var response = request.GetResponse())
using (var stream = response.GetResponseStream())
{
    pictureBox1.Image = Bitmap.FromStream(stream);
}

代码不工作，或者说没有响应

如何在图片框中预览URL缩略图

这里我使用了这个技巧

  using System;
  using System.Configuration;
  using System.Text.RegularExpressions;
    using System.Windows.Forms;
  using Facebook;
  using System.Net;
   using System.Drawing;
  using System.Drawing.Drawing2D;
   using System.Drawing.Imaging;
   using System.IO;

   public Bitmap GenerateScreenshot(string url)
    {
        // This method gets a screenshot of the webpage
        // rendered at its full size (height and width)
        return GenerateScreenshot(url, -1, -1);
    }
    public Bitmap GenerateScreenshot(string url, int width, int height)
    {
        // Load the webpage into a WebBrowser control
        WebBrowser wb = new WebBrowser();
        wb.ScrollBarsEnabled = false;
        wb.ScriptErrorsSuppressed = true;
        wb.Navigate(url);
        while (wb.ReadyState != WebBrowserReadyState.Complete) { Application.DoEvents(); }

        // Set the size of the WebBrowser control
        wb.Width = width;
        wb.Height = height;
        if (width == -1)
        {
            // Take Screenshot of the web pages full width
            wb.Width = wb.Document.Body.ScrollRectangle.Width;
        }
        if (height == -1)
        {
            // Take Screenshot of the web pages full height
            wb.Height = wb.Document.Body.ScrollRectangle.Height;
        }
        // Get a Bitmap representation of the webpage as it's rendered in the WebBrowser control
        Bitmap bitmap = new Bitmap(wb.Width, wb.Height);
        wb.DrawToBitmap(bitmap, new Rectangle(0, 0, wb.Width, wb.Height));
        wb.Dispose();
        return bitmap;
    }
    private void button1_Click(object sender, EventArgs e)
    {
        string pc = textBox1.Text;
        Bitmap thumbnail = GenerateScreenshot(textBox1.Text, 1024, 598);
        thumbnail = GenerateScreenshot(pc);
        // Display Thumbnail in PictureBox control
        pictureBox1.Image = thumbnail;

    }
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