今天给大家带来一个操作WebBrowser的一些高级方法,我专门写了一个html编辑器的实现代码,有需要的朋友可以自己扩充;
功能实现是直接写流到WebBrowser内不通过临时文件,并且支持对WebBrowser的一些高级控制(其实script可以达到的均可达到,想知道怎么搞的可以阅读代码)。
其中关于IPersistStreamInit接口的声明费了翻工夫,因为以前在 delphi 中没这么麻烦,呵呵。在网络上找了大半天没找到,最后还是祭出Reflector,反编译Windows.Forms,需要的朋友可以不用辛苦的自己搞了!
我在这个演示里,制作的html编辑环境是比简单的,您可以看看,比较比较 CodeProject 上的代码;我采用的是ie自身提供的编辑方法,只是这样的方式都被运用于web方式的编辑器内,就好比这个freeTextBox
以下是主要的代码:
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/********************************
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* 初始化浏览器状态
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* 指向about:blank
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* *****************************/
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private void Form1_Load(object sender, System.EventArgs e) {
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object obj = null;
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this.Show();
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this.axWb.Navigate("about:blank",ref obj,ref obj,ref obj,ref obj);
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//等待完成动作
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while(axWb.ReadyState < SHDocVw.tagREADYSTATE.READYSTATE_INTERACTIVE)
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Application.DoEvents();
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//初始化html编辑器
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InitHtmlEditor();
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}
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/*******************************
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* 这里是核心方法
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* 完全调用IE自身的html编辑功能
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* 可以看到,我采用了一种兼容的
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* 方式,用Frame(框架),这样
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* 的话,默认安装的Windows 98都
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* 支持html编辑功能;
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* 关键代码如下:
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* frame.document.designMode = "on";
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* 表示开启设计模式
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******************************/
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private void InitHtmlEditor(){
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string sw = "";
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sw += "<html>\r\n";
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sw += "<script language=javascript>\r\n";
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sw += " function loadSet(){\r\n";
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sw += " var frame=document.getElementById(\"i-frame\").contentWindow;\r\n";
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sw += " frame.document.designMode = \"on\";\r\n";
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sw += " frame.document.open();\r\n";
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sw += " frame.document.write(\"<html><font color=red>hello 大家好啊!<br>我是S.F. <br>";
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sw += " <a href=\\\"http://www.cnblogs.com/chinasf\\\">欢迎访问我的weblog</a></font></html>\");\r\n";
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sw += " frame.document.close();\r\n";
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sw += " }\r\n";
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sw += " function setBlod(obj){\r\n";
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sw += " document.getElementById(\"i-frame\").contentWindow.document.execCommand(\"bold\");\r\n";
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sw += " }\r\n";
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sw += "</script>\r\n";
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//这里加入了一个html的button,也就是说,你可以把web模式的html编辑器的代码完全copy进来
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sw += "<body onload=\"loadSet()\" scroll=\"yes\"><button onclick=\"setBlod(this);\">Blod</button>\r\n";
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sw += "<iframe id=\"i-frame\" frameBorder=\"1\" width=\"640\" height=\"480\"></iframe>\r\n";
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sw += "</body></html>\r\n";
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//写入浏览器
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WriteHtml(sw);
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}
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private void WriteHtml(string s){
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//内存流,用于转换string
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MemoryStream ms = new MemoryStream();
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try{
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byte[] htmlcode = System.Text.Encoding.Default.GetBytes(s);
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ms.Write(htmlcode,0,htmlcode.Length);
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Stream dataStream = ms;
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//恢复指针位置
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dataStream.Seek(0,0);
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if(axWb.Document!=null){
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//转换接口,并转换为IStream
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(axWb.Document as UnsafeNativeMethods.IPersistStreamInit).Load(new UnsafeNativeMethods.ComStreamFromDataStream(dataStream));
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}
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}finally{
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ms.Close();
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}
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}
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private void button1_Click(object sender, System.EventArgs e) {
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//获取document,在IHTMLDocument2中取得桢
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mshtml.IHTMLDocument3 idoc = (mshtml.IHTMLDocument3)axWb.Document;
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mshtml.IHTMLFrameBase2 fb= (mshtml.IHTMLFrameBase2)idoc.getElementById("i-frame");
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object obj=null;
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fb.contentWindow.document.execCommand("bold",true,obj);
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}
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private void button3_Click(object sender, System.EventArgs e) {
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//获取document,在IHTMLDocument2中才有body.style
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mshtml.IHTMLDocument2 idoc = (mshtml.IHTMLDocument2)axWb.Document;
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//指定为IHTMLStyle3,才可以定制滚动条颜色
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mshtml.IHTMLStyle3 istyle = (mshtml.IHTMLStyle3)idoc.body.style;
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istyle.scrollbarArrowColor = "#0099FF";
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istyle.scrollbar3dLightColor = "#FFFFFF";
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istyle.scrollbarDarkShadowColor = "#0099FF";
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istyle.scrollbarFaceColor = "#99CCFF";
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istyle.scrollbarHighlightColor = "#0099FF";
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istyle.scrollbarShadowColor = "#0099FF";
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istyle.scrollbarTrackColor = "#FFFFFF";
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}
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private void button2_Click(object sender, System.EventArgs e) {
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//查看源码,文本方式
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mshtml.IHTMLDocument3 idoc = (mshtml.IHTMLDocument3)axWb.Document;
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mshtml.IHTMLFrameBase2 fb= (mshtml.IHTMLFrameBase2)idoc.getElementById("i-frame");
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MessageBox.Show(fb.contentWindow.document.body.innerText);
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}
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private void button4_Click(object sender, System.EventArgs e) {
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//查看源码,HTML方式
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mshtml.IHTMLDocument3 idoc = (mshtml.IHTMLDocument3)axWb.Document;
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mshtml.IHTMLFrameBase2 fb= (mshtml.IHTMLFrameBase2)idoc.getElementById("i-frame");
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MessageBox.Show(fb.contentWindow.document.body.innerHTML);
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}
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这里下载完整工程代码。
2005年4月26日 欢迎指点批评!演示是很简陋的