(原创) 基于Chromium构建Chrome WebBrowser for .net 控件(还有

首先向360说句sorry,在2011年360极速浏览器出现的时候我去他们论坛里骂过。为什么要到歉呢,因为2012年我把我们公司使用IE WebBrowser改为Chrome控件了,中间遇到的辛酸使我明白360公司能做成产品确实不容易。言归正转,公司的壳程序是C#编写的WinForm程序,刚开始我只找到delphi的Chromium项目,然后在delphi2010中安装好控件后就生成DLL让WinForm程序调用,这种策略是我做这个控件的最大失败。因为我对delphi比较熟,很快控件就能在WinForm程序里跑起来了,很开心,立马根据壳中已经使用的事件和方法在自定义控件中实现,自测一下没有问题后就交给测试人员来试用,半天的功夫,测试员小张就来对我说:罗兄,网页中不能使用键盘上Tab键切换,回车事件响应不了……不会吧,是不是焦点没有定位到自定义控件中,我第一时间就是这样想,,然后就是反复的折腾,还是不行。最后Google了一下,好不容易找到一个让自己信服的答案,就是win32的消息循环机制与.net消息机制不一样,嵌入到WinForm中的VCL控件不能得到消息。我靠,这还得了,leader还不把我劈了,leader已经吩咐美工全按chrome浏览器的样式来写了。兵来将挡,水来土淹,我火速Google一个能在.net上跑的版本“CefSharp” ,下载来看,傻眼了,是C++版的,咋办?熬夜啃吧!

我分为了两个项目,一是libfuncs,为了使DLL名称一致,我重命名了CefSharp项目,它负责提供操作浏览器的方法和触发事件;二是cwber,它是自定义的WinForm控件,用于在Form上的布局,必须引用libfuncs.dll。

源码地址:https://sourceforge.net/projects/chromewebbrowse

cwber比较简单,以下是它的代码:

using System;using System.Collections.Generic;using System.ComponentModel;using System.Drawing;using System.Data;using System.Text;using System.Windows.Forms;using libfuncs;namespace cwber{public partial class ChromeWebBrowser : UserControl{private ChromeApp chrome = null;ToolTip myToolTip = new ToolTip();public ChromeWebBrowser(){InitializeComponent();ChromeWebBrowser.CheckForIllegalCrossThreadCalls = false;}private void ChromeWebBrowser_Load(object sender, EventArgs e){if (chrome == null){chrome = new ChromeApp();}Start();}#region 外部调用方法libfuncs.DocumentCompletedEvent elementEvent1;libfuncs.FrameLoadStartEvent elementEvent2;libfuncs.FrameLoadEndEvent elementEvent3;libfuncs.FileDownloadingEvent fileDownloading;libfuncs.FileDownloadCompletedEvent fileDownloaded;libfuncs.ComponentInitialized componentInitialized;libfuncs.ToolTipEventListener toolTipEvent;public void Start(){if (chrome != null){chrome.Dock = DockStyle.Fill;if (componentInitialized == null){componentInitialized = new libfuncs.ComponentInitialized(componentInitializedEvent);chrome.RegisterEvent(componentInitialized);}Controls.Add(chrome);if (elementEvent1 == null){elementEvent1 = new libfuncs.DocumentCompletedEvent(documentComplete);chrome.RegisterEvent(elementEvent1);}if (elementEvent2 == null){elementEvent2 = new libfuncs.FrameLoadStartEvent(frameStartStart);chrome.RegisterEvent(elementEvent2);}if (elementEvent3 == null){elementEvent3 = new libfuncs.FrameLoadEndEvent(frameLoadEnd);chrome.RegisterEvent(elementEvent3);}if (fileDownloading == null){fileDownloading = new libfuncs.FileDownloadingEvent(this.downloading);chrome.RegisterEvent(fileDownloading);}if (fileDownloaded == null){fileDownloaded = new libfuncs.FileDownloadCompletedEvent(this.downloaded);chrome.RegisterEvent(fileDownloaded);}if (toolTipEvent == null){toolTipEvent = new libfuncs.ToolTipEventListener(this.ShowToolTipText);chrome.RegisterEvent(toolTipEvent);}chrome.Visible = true;chrome.BringToFront();}}/** 描述:释放浏览器*/public void Free(){elementEvent1 = null;elementEvent2 = null;elementEvent3 = null;fileDownloading = null;fileDownloaded = null;componentInitialized = null;toolTipEvent = null;chrome.Dispose();chrome = null;}/** 参数:Url 打开网页地址* 描述:打开网址。*/public void OpenUrl(string Url){if (chrome != null)chrome.Load(Url);}/** 参数:id 网页中的控件元素ID* 描述:根据元素ID获取元素的值,适用于Input,A标签元素*/public string GetElementValueById(string id){return chrome == null ? "" : chrome.GetElementValueById(id);}/** 参数:id 网页中的控件元素ID, value 元素新值* 描述:为页面中元素赋予新值。*/public void SetElementValueById(string id, string value){if (chrome != null){chrome.SetElementValueById(id, value);}}public delegate void TCallBackElementEventListener();private List<libfuncs.ElementEventListener> elementEventList = new List<libfuncs.ElementEventListener>();/** 描述:附加元素的侦听事件。当该元素触发附加事件时,则执行TCallBackElementEventListener委托方法*/public void AppendElementEventListener(string id, string eventName, TCallBackElementEventListener callFunc){libfuncs.ElementEventListener elementEvent = new libfuncs.ElementEventListener(callFunc);elementEventList.Add(elementEvent);chrome.AddElementEventListener(id, eventName, elementEvent);}/** 描述:向页面中注入并执行脚本。*/public void ExecuteScript(string script){if (chrome != null)chrome.ExecuteScript(script);}public object EvaluateScript(string script){if (chrome != null)return chrome.EvaluateScript(script);elsereturn null;}/** 描述:计算文件单位。用于文件下载。*/private string CompareFileSize(Int64 size){//计算K,M单位string strTotalSize = string.Empty;if (size < 1024){strTotalSize = size.ToString() + " B";}else if (size >= 1024 && size < 1024 * 1024){strTotalSize = (size / 1024).ToString() + " KB";}else{strTotalSize = (size / 1024 / 1024).ToString() + " MB";}return strTotalSize;}#endregion#region 属性public string Url{get{return chrome == null?"":chrome.Core.Address;}}#endregion#region 事件/*控件初始化事件*/public event EventHandler ComponentInitializedEventHandler;private void componentInitializedEvent(){EventArgs e = new EventArgs();if (ComponentInitializedEventHandler != null)ComponentInitializedEventHandler(this, e);}/*页面加载完成事件*/public event EventHandler DocumentCompletedEventHandler;private void documentComplete(){EventArgs e = new EventArgs();if (DocumentCompletedEventHandler != null)DocumentCompletedEventHandler(this, e);}/*Frame加载完成事件,这里的Frame可以是页面本身,也是iFrame元素*/public event EventHandler PageLoadFinishEventHandler;private void frameLoadEnd(){EventArgs e = new EventArgs();if (PageLoadFinishEventHandler != null)PageLoadFinishEventHandler(this, e);}/*Frame加载开始事件,这里的Frame可以是页面本身,也是iFrame元素*/public event EventHandler PageLoadStartEventHandler;private void frameStartStart(){EventArgs e = new EventArgs();if (PageLoadStartEventHandler != null)PageLoadStartEventHandler(this, e);}/*下载中事件,不开放该事件*/Form downloadForm = null;private void downloading(Int64 totalSize, Int64 loadedSize){string strTotalSize = CompareFileSize(totalSize);string strLoadedSize = CompareFileSize(loadedSize);if (downloadForm == null){downloadForm = new Form();downloadForm.Text = "下载中";downloadForm.Width = 280;downloadForm.Height = 150;downloadForm.MaximizeBox = false;downloadForm.MinimizeBox = false;downloadForm.ControlBox = false;downloadForm.StartPosition = FormStartPosition.CenterScreen;Label label = new Label();label.Left = 20;label.Top = 50;label.Width = 250;label.Text = "已下载:" + strLoadedSize + "/" + strTotalSize;downloadForm.Controls.Add(label);}downloadForm.Show();downloadForm.BringToFront();foreach (Control c in downloadForm.Controls){if (c is Label){Label label = (Label)c;label.Text = "已下载:" + strLoadedSize + "/" + strTotalSize;label.Update();}}downloadForm.Update();}/*下载完成事件,不开放该事件*/private void downloaded(){if (downloadForm != null)downloadForm.Close();downloadForm = null;}/*消息提示事件,不开放*/private void ShowToolTipText(string text){if (chrome == null) return;if (string.IsNullOrEmpty(text)){myToolTip.RemoveAll();return;}//保证每行40个字int len = text.Length;int offset = 40;int count = len / offset;for (int i = 1; i <= count; i++){text = text.Insert(offset * i, "\n");}myToolTip.ShowAlways = false;myToolTip.UseAnimation = true;myToolTip.UseFading = true;//t.SetToolTip(button1, text);Point p = Control.MousePosition;Point p1 = this.PointToClient(p);myToolTip.Show(text, chrome, p1.X+20, p1.Y+10);}#endregion}}重点是libfuncs中的libfuncs.h、ChromeApp.h、ChromeApp.cpp、ClientAdapter.h、ClientAdapter.cpp五个文件,实现方法都在里面,其他的文件基本都是接口文件。我自己只根据项目实际需求来做的功能,接口没有全部实现。这个部分大家看源代码吧,我用到的地方都注释了。文采不行,写不动,大家原谅。睡了。

最后说句,我们公司网页美工解脱了!

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(原创) 基于Chromium构建Chrome WebBrowser for .net 控件(还有

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