I have the string with URL. For example "http://google.com".
Is there are any way to download and render this page to picture file? ("test.jpg")
I tried to use WebBrowser control, to download and render picture, but it only works when WebBrowser placed in displayed form. In other ways it's render only black rectangle.
But i want to render picture without any visual effect (creating, activating form etc.)
Internet Explorer supports the IHtmlElementRenderer interface, available to render a page to an arbitrary device context. Here's a sample form that shows you how to use it. Start with Project + Add Reference, select Microsoft.mshtml
using System;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace WindowsFormsApplication1 {
public partial class Form1 : Form {
public Form1() {
InitializeComponent();
webBrowser1.Url = new Uri("http://stackoverflow.com");
webBrowser1.DocumentCompleted += webBrowser1_DocumentCompleted;
}
void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e) {
if (!e.Url.Equals(webBrowser1.Url)) return;
// Get the renderer for the document body
mshtml.IHTMLDocument2 doc = (mshtml.IHTMLDocument2)webBrowser1.Document.DomDocument;
mshtml.IHTMLElement body = (mshtml.IHTMLElement)doc.body;
IHTMLElementRender render = (IHTMLElementRender)body;
// Render to bitmap
using (Bitmap bmp = new Bitmap(webBrowser1.ClientSize.Width, webBrowser1.ClientSize.Height)) {
using (Graphics gr = Graphics.FromImage(bmp)) {
IntPtr hdc = gr.GetHdc();
render.DrawToDC(hdc);
gr.ReleaseHdc();
}
bmp.Save("test.png");
System.Diagnostics.Process.Start("test.png");
}
}
// Replacement for mshtml imported interface, Tlbimp.exe generates wrong signatures
[ComImport, InterfaceType((short)1), Guid("3050F669-98B5-11CF-BB82-00AA00BDCE0B")]
private interface IHTMLElementRender {
void DrawToDC(IntPtr hdc);
void SetDocumentPrinter(string bstrPrinterName, IntPtr hdc);
}
}
}
Unfortunately, MS deprecated use of IHtmlElementRenderer::DrawToDC() in IE 9. http://msdn.microsoft.com/en-us/library/aa752273(v=vs.85).aspx
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