一、前言
经过上几篇的学习,现在我们已经掌握了ActiveX的整个开发过程,但要发挥ActiveX的真正威力,必须依靠JS。下面一起来学习吧!
二、JS调用ActiveX方法
只需在UserControl子类中(即自定义的ActiveX控件中),编写公共方法即可。
C#
[Guid("0203DABD-51B8-4E8E-A1EB-156950EE1668")] public partial class Uploader : UserControl, IObjectSafety { public Uploader(){ InitializeComponent(); } // 被JS调用的ActiveX方法 public void SayHi(msg){ MessageBox.show(msg); } }
html
// 注意:object必须要写成<object></object>才能通过document.getElementById来获取 <object classid="clsid:xxxxxxxxxx" id="ax"></object> <script type="text/javascript"> document.getElementById('ax').SayHi('Test');// 调用ActiveX方法 </script>
三、ActiveX调用JS方法
1. 引入`Microsoft.mshtml`程序集,该程序集位于`C:\Program Files\Microsoft.NET\Primary Interop Assemblies\Microsoft.mshtml.dll`
2. 实现COM类`IOleClientSite`
C#
[ComImport, Guid("00000118-0000-0000-C000-000000000046"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] public interface IOleClientSite { void SaveObject(); void GetMoniker(uint dwAssign, uint dwWhichMoniker, object ppmk); void GetContainer(out IOleContainer ppContainer); void ShowObject(); void OnShowWindow(bool fShow); void RequestNewObjectLayout(); }
3. 实现COM类`IOleContainer`
C#
[ComImport, Guid("0000011B-0000-0000-C000-000000000046"), InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)] public interface IOleContainer { void EnumObjects([In, MarshalAs(UnmanagedType.U4)] int grfFlags, [Out, MarshalAs(UnmanagedType.LPArray)] object[] ppenum); void ParseDisplayName([In, MarshalAs(UnmanagedType.Interface)] object pbc, [In, MarshalAs(UnmanagedType.BStr)] string pszDisplayName, [Out, MarshalAs(UnmanagedType.LPArray)] int[] pchEaten, [Out, MarshalAs(UnmanagedType.LPArray)] object[] ppmkOut); void LockContainer([In, MarshalAs(UnmanagedType.I4)] int fLock); }
4. 在用户控件中调用JS方法
在MyUserControl.cs中
C#
#region 调用js函数 private Type typeIOleObject = null; private IOleClientSite oleClientSite = null; private IOleContainer pObj = null; /// <summary> /// 调用JS函数 /// </summary> /// <param name="fnName">js函数名</param> /// <param name="args">入参</param> protected void CallJS(string fnName, params object[] args) { if (typeIOleObject == null) { typeIOleObject = this.GetType().GetInterface("IOleObject", true); object tmpOldClientSite = typeIOleObject.InvokeMember("GetClientSite", BindingFlags.Instance | BindingFlags.InvokeMethod | BindingFlags.Public, null, this, null); oleClientSite = tmpOldClientSite as IOleClientSite; oleClientSite.GetContainer(out pObj); } //获取页面的Script集合 IHTMLDocument pDoc2 = (IHTMLDocument)pObj; object script = pDoc2.Script; try { //调用JavaScript方法OnScaned并传递参数,因为此方法可能并没有在页面中实现,所以要进行异常处理 script.GetType().InvokeMember(fnName, BindingFlags.Instance | BindingFlags.InvokeMethod | BindingFlags.Public, null, script, args); } catch { } } #endregion
五、踩过的坑
1. 若在IE9下无法加载ActiveX控件
检查是否为64位的IE9。32位的ActiveX控件不能在64位的IE上使用。(通过“任务管理器”查看进程名称,若为浏览器进程名称后跟32就是32位的)
六、总结
《.Net魔法堂:史上最全的ActiveX开发教程》系列总算整理完了,起个博眼球的标题,希望系列的内容不会让大家失望啦。谢谢收看,哈哈!
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