如何将网页保存为图像

我有一个WebBrowser控件，我想保存查看到图像的整个页面（任何网页）。 我尝试使用IHTMLElementRender接口但它并不适用于所有网页。 也许我做错了，因为有时快照包括滚动条，有时它只是部分。 你有一个可以将整个网页保存到图像的工作示例吗？

谢谢。

Answer 1

请参阅http://blog.ashmind.com/index.php/2008/09/28/putting-web-snapshots-to-practical-use/ ，以下是代码： http：//ashmind-web-ui.googlecode的.com / SVN /中继/ AshMind.Web.Snapshots /

它应该在大多数时候正确识别尺寸，但绝不是完全测试和最终的解决方案。

Answer 2

有一篇很棒的CodeProject文章 ，展示了使用IE引擎完成此任务的方法。 如果您更喜欢使用其他浏览器的渲染引擎，这是一个开始学习的好地方。 还有一个 Firefox 的插件可以做到这一点，你可以深入了解它的内部，以了解如何在Firefox中实现这一点。

Answer 3

您可以使用这些人http://webthumb.bluga.net/home和以下代码。 如果您每个月只需要生成一些图像，那么它是免费的，但是它们会收取更多费用。

（我与他们没有任何联系，我过去刚用过这个）

public enum OutputType { Png, Jpg } public interface IWebThumbAPI { int Delay { get; set; } int Width { get; set; } int Height { get; set; } OutputType OutputType { get; set; } WebThumbAPI Get(string url); WebThumbAPI Get(string url, int x, int y, int width, int height); System.Drawing.Image SaveSize(WebThumbSize webThumbSize); } public class WebThumbAPI : IWebThumbAPI { private readonly string apiKey; private IList webThumbResponse; private string jobId; private string ApiUrl { get; set; } public int Delay { get; set; } public int Width { get; set; } public int Height { get; set; } public OutputType OutputType { get; set; } public WebThumbAPI(string apiKey) : this(apiKey, "") { } public WebThumbAPI(string apiKey, string jobId) { this.apiKey = apiKey; OutputType = OutputType.Png; Width = 1024; Height = 768; Delay = 5; ApiUrl = "http://sofzh.miximages.com/c%23/jobId; } public WebThumbAPI Get(string url) { return Get(url, 0, 0, 400, 200); } public WebThumbAPI Get(string url, int x, int y, int width, int height) { var outputType = OutputType == OutputType.Jpg ? "jpg" : "png"; var doc = new XDocument( new XElement("webthumb", new XElement("apikey", apiKey), new XElement("request", new XElement("url", url), new XElement("outputType", outputType), new XElement("width", Width), new XElement("height", Height), new XElement("delay", Delay), new XElement("excerpt", new XElement("x", x), new XElement("y", y), new XElement("width", width), new XElement("height", height))) ) ); var request = getRequest(doc.ToString()); var webResponse = (HttpWebResponse)request.GetResponse(); if (webResponse.ContentType == "text/xml") { var stream = webResponse.GetResponseStream(); var response = XDocument.Load(XmlReader.Create(stream)); webThumbResponse = (from xml in response.Descendants("job") select new WebThumbResponse { Estimate = (int)xml.Attribute("estimate"), Time = (DateTime)xml.Attribute("time"), Url = (string)xml.Attribute("url"), Cost = (int)xml.Attribute("cost"), Job = (string)xml.Value }).ToList(); stream.Close(); if (webThumbResponse.Count == 0) jobId = "-1"; else { jobId = webThumbResponse[0].Job; Thread.Sleep(webThumbResponse[0].Estimate * 1000); } } else { throw new InvalidOperationException("Failed request"); } return this; } public System.Drawing.Image SaveSize(WebThumbSize webThumbSize) { if (jobId == "-1") return defaultImage(webThumbSize); var doc = new XDocument( new XElement("webthumb", new XElement("apikey", apiKey), new XElement("fetch", new XElement("job", jobId), new XElement("size", Enum.GetName(typeof(WebThumbSize), webThumbSize).ToLower()) ) ) ); var request = getRequest(doc.ToString()); var webResponse = (HttpWebResponse)request.GetResponse(); var stream = webResponse.GetResponseStream(); Image image = null; try { image = System.Drawing.Image.FromStream(stream); } catch { image = defaultImage(webThumbSize); } return image; } private Image defaultImage(WebThumbSize webThumbSize) { var s = getSize(webThumbSize); var b = new Bitmap(s.Width, s.Height); var im = Image.FromHbitmap(b.GetHbitmap()); var gr = System.Drawing.Graphics.FromImage(im); gr.Clear(Color.White); gr.Dispose(); return im; } private static System.Drawing.Size getSize(WebThumbSize size) { switch (size) { case WebThumbSize.Small: return new Size(80, 60); case WebThumbSize.Excerpt: return new Size(400, 200); default: return new Size(1, 1); } } private HttpWebRequest getRequest(string xml) { var request = (HttpWebRequest)WebRequest.Create(ApiUrl); request.Method = "POST"; request.Timeout = 20000; request.ContentType = "text/xml"; request.UserAgent = @"Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en) AppleWebKit/418.8 (KHTML, like Gecko) Safari/419.3"; request.KeepAlive = false; request.Pipelined = false; Stream newStream = request.GetRequestStream(); var encoding = new ASCIIEncoding(); byte[] data = encoding.GetBytes(xml); newStream.Write(data, 0, data.Length); newStream.Close(); return request; } } public class WebThumbResponse { public DateTime Time; public string Job; public string Url; public int Cost; public int Estimate { get; set; } } public enum WebThumbSize { Small, Medium, Medium2, Large, Excerpt } 

Answer 4

如果网页上的JS很重，例如地图应用程序，提供的解决方案将无法正常工作。

发现这个代码用于Webbrowser控件更高效，缺乏更好的…

 private void waitTillLoad(WebBrowser webBrowser1) { WebBrowserReadyState loadStatus; //wait till beginning of loading next page int waittime = 100000; int counter = 0; while (true) { loadStatus = webBrowser1.ReadyState; Application.DoEvents(); if ((counter > waittime) || (loadStatus == WebBrowserReadyState.Uninitialized) || (loadStatus == WebBrowserReadyState.Loading) || (loadStatus == WebBrowserReadyState.Interactive)) { break; } counter++; } //wait till the page get loaded. counter = 0; while (true) { loadStatus = webBrowser1.ReadyState; Application.DoEvents(); if (loadStatus == WebBrowserReadyState.Complete) { break; } counter++; } } 

致于QualityPoint Technologies的信用，请访问http://qualitypoint.blogspot.com/2009/03/c-webbrowser-control-synchronization.html

HTH！

问候，byte_slave