从ASP.NET网页转换图像 [英] Convert webpage to image from ASP.NET

问题描述

我想创建在C＃中的函数，它接受一个特定网页，并从内部ASP.NET覆羽为JPG图片。 我不希望通过第三方或缩略服务，因为我需要完整的图像要做到这一点。我想我需要以某种方式从内部ASP.NET利用WebBrowser控件可我就是'看不到何处着手。有没有人有例子吗？

I would like to create a function in C# that takes a specific webpage and coverts it to a JPG image from within ASP.NET. I don't want to do this via a third party or thumbnail service as I need the full image. I assume I would need to somehow leverage the webbrowser control from within ASP.NET but I just can't see where to get started. Does anyone have examples?

推荐答案

好吧，这是相当容易的，当我结合几种不同的解决方案：

Ok, this was rather easy when I combined several different solutions:

这些解决方案给了我使用从ASP.NET web浏览器一个线程安全的方式：

These solutions gave me a thread-safe way to use the WebBrowser from ASP.NET:

<一个href=\"http://www.beansoftware.com/ASP.NET-Tutorials/Get-Web-Site-Thumbnail-Image.aspx\">http://www.beansoftware.com/ASP.NET-Tutorials/Get-Web-Site-Thumbnail-Image.aspx

<一个href=\"http://www.eggheadcafe.com/tutorials/aspnet/b7cce396-e2b3-42d7-9571-cdc4eb38f3c1/build-a-selfcaching-asp.aspx\">http://www.eggheadcafe.com/tutorials/aspnet/b7cce396-e2b3-42d7-9571-cdc4eb38f3c1/build-a-selfcaching-asp.aspx

这个解决方案给了我一个办法BMP转换为JPG：

This solution gave me a way to convert BMP to JPG:

<一个href=\"http://stackoverflow.com/questions/41665/bmp-to-jpg-png-in-c\">http://stackoverflow.com/questions/41665/bmp-to-jpg-png-in-c

我简单地适应了code和把下面进入的.cs：

I simply adapted the code and put the following into a .cs:

using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Threading;
using System.Windows.Forms;

public class WebsiteToImage
{
    private Bitmap m_Bitmap;
    private string m_Url;
    private string m_FileName = string.Empty;

    public WebsiteToImage(string url)
    {
        // Without file 
        m_Url = url;
    }

    public WebsiteToImage(string url, string fileName)
    {
        // With file 
        m_Url = url;
        m_FileName = fileName;
    }

    public Bitmap Generate()
    {
        // Thread 
        var m_thread = new Thread(_Generate);
        m_thread.SetApartmentState(ApartmentState.STA);
        m_thread.Start();
        m_thread.Join();
        return m_Bitmap;
    }

    private void _Generate()
    {
        var browser = new WebBrowser { ScrollBarsEnabled = false };
        browser.Navigate(m_Url);
        browser.DocumentCompleted += WebBrowser_DocumentCompleted;

        while (browser.ReadyState != WebBrowserReadyState.Complete)
        {
            Application.DoEvents();
        }

        browser.Dispose();
    }

    private void WebBrowser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
    {
        // Capture 
        var browser = (WebBrowser)sender;
        browser.ClientSize = new Size(browser.Document.Body.ScrollRectangle.Width, browser.Document.Body.ScrollRectangle.Bottom);
        browser.ScrollBarsEnabled = false;
        m_Bitmap = new Bitmap(browser.Document.Body.ScrollRectangle.Width, browser.Document.Body.ScrollRectangle.Bottom);
        browser.BringToFront();
        browser.DrawToBitmap(m_Bitmap, browser.Bounds);

        // Save as file? 
        if (m_FileName.Length > 0)
        {
            // Save 
            m_Bitmap.SaveJPG100(m_FileName);
        }
    }
}

public static class BitmapExtensions
{
    public static void SaveJPG100(this Bitmap bmp, string filename)
    {
        var encoderParameters = new EncoderParameters(1);
        encoderParameters.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 100L);
        bmp.Save(filename, GetEncoder(ImageFormat.Jpeg), encoderParameters);
    }

    public static void SaveJPG100(this Bitmap bmp, Stream stream)
    {
        var encoderParameters = new EncoderParameters(1);
        encoderParameters.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 100L);
        bmp.Save(stream, GetEncoder(ImageFormat.Jpeg), encoderParameters);
    }

    public static ImageCodecInfo GetEncoder(ImageFormat format)
    {
        var codecs = ImageCodecInfo.GetImageDecoders();

        foreach (var codec in codecs)
        {
            if (codec.FormatID == format.Guid)
            {
                return codec;
            }
        }

        // Return 
        return null;
    }
}

，可通过如下调用它：

And can call it as follows:

WebsiteToImage websiteToImage = new WebsiteToImage( "http://www.cnn.com", @"C:\Some Folder\Test.jpg");
websiteToImage.Generate();

它与两个文件和一个流。 确保你System.Windows.Forms的引用添加到您的ASP.NET项目。我希望这有助于。

更新：我已经更新了code，包括捕获完整的页面，并且不需要任何特殊设置只捕获它的一部分能力

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