C# ActiveX 控制項中調用 JavaScript 法

 

1.引用Microsoft.mshtml 

Microsoft.mshtml的路徑是C:/Program Files/Microsoft.NET/Primary Interop Assemblies/Microsoft.mshtml.dll，添加引用後在ActiveX對應類中編寫：

using mshtml;

2.用c#實現兩個COM類，IOleClientSite和IOleContainer

using System.Runtime.InteropServices;[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();}[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,        [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);}

3.調用JavaScript方法 

在Activex控制項的對應類中就可以編寫如下的CallJavaScript方法： 

private void CallJavaScript(string Filenames){    Type typeIOleObject = this.GetType().GetInterface("IOleObject", true);    object oleClientSite = typeIOleObject.InvokeMember("GetClientSite",     BindingFlags.Instance | BindingFlags.InvokeMethod | BindingFlags.Public,    null,    this,    null);    IOleClientSite oleClientSite2 = oleClientSite as IOleClientSite;    IOleContainer pObj;    oleClientSite2.GetContainer(out pObj);    //參數數組    object[] args = new object[1];    args[0] = Filenames;    //擷取頁面的Script集合    IHTMLDocument pDoc2 = (IHTMLDocument) pObj;    object script = pDoc2.Script;    try    {        //調用JavaScript方法OnScaned並傳遞參數，因為此方法可能並沒有在頁面中實現，所以要進行異常處理        script.GetType().InvokeMember("OnScaned",        BindingFlags.Instance | BindingFlags.InvokeMethod | BindingFlags.Public,       null,        script,        args);    }    catch { }}

4.在頁面中實現相應的JavaScript方法 

在包含這個ActiveX控制項的頁面中添加如下的JavaScript方法：

<mce:script type="text/javascript"><!--function OnScaned(files){    if (files)    {        //do something    }}// --></mce:script>

這樣，在ActiveX控制項中調用CallJavaScript方法時，最終就會調用到頁面中的OnScaned方法，藉此實現了ActiveX的“事件”機制。