下载网站的所有图片 [英] download all Images of a Website

问题描述

所以我昨晚才开始学习 C#.我开始的第一个项目是一个简单的 Image-Downloader，它使用 HtmlElementCollection 下载网站的所有图像.

So I just started learning C# last night. The first project I started was a simple Image-Downloader, which downloads all images of a website using HtmlElementCollection.

这是我目前得到的:

    private void dl_Click(object sender, EventArgs e)
    {
        System.Net.WebClient wClient = new System.Net.WebClient();

        HtmlElementCollection hecImages = Browser.Document.GetElementsByTagName("img");

        for (int i = 0; i < hecImages.Count - 1; i++)
        {

            char[] ftype = new char[4];
            string gtype;

            try
            {
                //filetype
                hecImages[i].GetAttribute("src").CopyTo(hecImages[i].GetAttribute("src").Length -4,ftype,0,4) ;
                gtype = new string(ftype);

                //copy image to local path
                wClient.DownloadFile(hecImages[i].GetAttribute("src"), absPath + i.ToString() + gtype);                                                                               
            }
            catch (System.Net.WebException) 
            {
                expand_Exception_Log();
                System.Threading.Thread.Sleep(50);
            }

基本上它是提前渲染页面并寻找图像.这工作得很好，但由于某种原因，它只下载缩略图，而不是完整的(高分辨率)图像.

Basically it's rendering the page in advance and looking for the images. This works pretty well, but for some reason it only downloads the Thumbnails, but not the full (high-res) image.

其他来源:

WebClient.DownloadFile 上的文档:http:///msdn.microsoft.com/en-us/library/ez801hhe(v=vs.110).aspx

Documentation on WebClient.DownloadFile: http://msdn.microsoft.com/en-us/library/ez801hhe(v=vs.110).aspx

DownloadFile 方法从 address 参数中指定的 URI 下载数据到本地文件.

The DownloadFile method downloads to a local file data from the URI specified by in the address parameter.

推荐答案

看看 如何使用 HTML Agility Pack 从网站上检索所有图像?

这使用名为 HTML Agility Pack 的库来下载网站上的所有 <img src="" \> 行.如何才能我使用 HTML Agility Pack 从网站检索所有图像?

This uses a library called HTML Agility Pack to download all <img src="" \> lines on a website. How can I use HTML Agility Pack to retrieve all the images from a website?

如果该主题不知何故消失了，我会将其提供给需要它但无法触及该主题的人.

If that topic somehow disappears, I'm putting this up for those who need it but can't reach that topic.

// Creating a list array
public List<string> ImageList; 
public void GetAllImages()
{
    // Declaring 'x' as a new WebClient() method
    WebClient x = new WebClient();

    // Setting the URL, then downloading the data from the URL.
    string source = x.DownloadString(@"http://www.google.com");

    // Declaring 'document' as new HtmlAgilityPack() method
    HtmlAgilityPack.HtmlDocument document = new HtmlAgilityPack.HtmlDocument();

    // Loading document's source via HtmlAgilityPack
    document.LoadHtml(source);

    // For every tag in the HTML containing the node img.
    foreach(var link in document.DocumentNode.Descendants("img")
                                .Select(i => i.Attributes["src"])) 
    {
        // Storing all links found in an array.
        // You can declare this however you want.
        ImageList.Add(link.Attribute["src"].Value.ToString());
    }
}

<小时>

由于您是新手，因此您可以使用 NuGet 轻松添加 HTML Agility Pack.要添加它，您在项目上右键单击，单击Manage NuGet Packages，在左侧的 Online 选项卡中搜索 HTML Agility Pack 并单击安装.您需要使用 using HtmlAgilityPack;

---

Since you are rather new as you stated, you can add HTML Agility Pack easily with NuGet. To add it, you right-click on your project, click Manage NuGet Packages, search the Online tab on the left hand side for HTML Agility Pack and click install. You need to call it by using using HtmlAgilityPack;

毕竟，您应该可以创建并使用已创建的方法来下载上面创建的 image_list 数组中包含的所有项目.

After all that you should be fine creating and using a method already created to download all items contained in the image_list array created above.

祝你好运！

添加了解释每个部分的作用的注释.

Added comments explaining what each section does.

更新了代码段以反映用户评论.

Updated snippet to reflect user comment.

这篇关于下载网站的所有图片的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！