C# 用C语言钩住IE事件#
我正在尝试从现有IE窗口捕获事件。在下面的代码示例中,我试图在用户单击某个元素时捕获浏览器文档中的C# 用C语言钩住IE事件#,c#,internet-explorer,com,C#,Internet Explorer,Com,我正在尝试从现有IE窗口捕获事件。在下面的代码示例中,我试图在用户单击某个元素时捕获浏览器文档中的mouseClick事件,然后最终返回有关被单击元素的一些属性 public partial class frmBrowserElementBuilder : Form { InternetExplorer ie; public frmBrowserElementBuilder() { InitializeComponent(); } pri
mouseClick
事件,然后最终返回有关被单击元素的一些属性
public partial class frmBrowserElementBuilder : Form
{
InternetExplorer ie;
public frmBrowserElementBuilder()
{
InitializeComponent();
}
private void frmBrowserElementBuilder_Load(object sender, EventArgs e)
{
//create IE
ie = new InternetExplorer();
ie.Visible = true;
//handle document completed
ie.DocumentComplete += new
DWebBrowserEvents2_DocumentCompleteEventHandler(DocumentComplete);
}
public void DocumentComplete(object pDisp, ref object URL)
{
//document was loaded
//MessageBox.Show("DocumentComplete: " + URL);
//create event handler and hook onclick from IE
DHTMLEventHandler onClickHandler = new DHTMLEventHandler(ie.Document);
onClickHandler.assignedEvent += new DHTMLEvent(this.ie_onClick);
ie.Document.onclick = onClickHandler;
}
private void ie_onClick(mshtml.IHTMLEventObj e)
{
//something was clicked
MessageBox.Show(string.Format("Event Hooked {0}, Qualifier {1}", e.type, e.qualifier));
}
public delegate void DHTMLEvent(IHTMLEventObj e);
[ComVisible(true)]
public class DHTMLEventHandler
{
public DHTMLEvent assignedEvent;
private mshtml.HTMLDocument document;
public DHTMLEventHandler(mshtml.HTMLDocument doc)
{
//assign to instance of IE document
this.document = doc;
}
[DispId(0)]
public void Call()
{
//call the event
assignedEvent(this.document.parentWindow.@event); //{System.InvalidCastException: "Specified cast is not valid."}
}
}
}
代码编译并按预期触发void Call(),但是,this.document.parentwindow
的值为null
,并且是抛出的System.InvalidCastException:当进入assignedEvent方法时,指定的强制转换无效。
当我检查this.document
时,parentWindow
的值表示
函数求值需要运行所有线程
强制评估后,它声明:
“((mshtml.HTMLDocumentClass)this.document).parentWindow”引发了
类型为“System.InvalidCastException”的异常
有什么想法吗?这是个问题。Call()调用发生在MTA线程上,您无法从MTA线程访问MSHTML。有很多方法可以改变这一点,但最简单的方法是:
public void DocumentComplete(object pDisp, ref object URL)
{
var events = (HTMLDocumentEvents2_Event)ie.Document;
events.onclick += (evt) =>
{
MessageBox.Show(string.Format("Event Hooked {0}, Qualifier {1}", evt.type, evt.qualifier));
return false;
};
}
谢谢你的澄清!