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c# Active Document Server / C# ActiveX Control / Communicating with Container

Posted on 2006-07-17
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Last Modified: 2008-01-09
Hello Experts,

I have created an ActiveX control in C# (almost an activex but it's a DLL and i had messed around with the registry) and it is contained inside IE.

What are the interfaces I need to implement in my c# UserControl for it to talk back and forth with the ActiveX container which is IE?

I didn't know if these are the right ones though:
IPersistFile, IOleObject, and IDataObject... based on this msdn page:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccore/html/_core_internet_first_steps.3a_.activex_documents.asp

Thanks in advance!
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Question by:AlphaGuys
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7 Comments
 

Author Comment

by:AlphaGuys
ID: 17125959
I tried implementing IOleObject in my usercontrol using these interfaces:

    [ComImport]
    [Guid("00000112-0000-0000-C000-000000000046")]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IOleObject
    {
        void SetClientSite(IOleClientSite pClientSite);
        void GetClientSite(ref IOleClientSite ppClientSite);
        void SetHostNames(object szContainerApp, object szContainerObj);
        void Close(uint dwSaveOption);
        void SetMoniker(uint dwWhichMoniker, object pmk);
        void GetMoniker(uint dwAssign, uint dwWhichMoniker, object ppmk);
        void InitFromData(System.Runtime.InteropServices.ComTypes.IDataObject pDataObject, bool fCreation, uint dwReserved);
        void GetClipboardData(uint dwReserved, ref System.Runtime.InteropServices.ComTypes.IDataObject ppDataObject);
        void DoVerb(uint iVerb, uint lpmsg, object pActiveSite, uint lindex, uint hwndParent, uint lprcPosRect);
        void EnumVerbs(ref object ppEnumOleVerb);
        void Update();
        void IsUpToDate();
        void GetUserClassID(uint pClsid);
        void GetUserType(uint dwFormOfType, uint pszUserType);
        void SetExtent(uint dwDrawAspect, uint psizel);
        void GetExtent(uint dwDrawAspect, uint psizel);
        void Advise(object pAdvSink, uint pdwConnection);
        void Unadvise(uint dwConnection);
        void EnumAdvise(ref object ppenumAdvise);
        void GetMiscStatus(uint dwAspect, uint pdwStatus);
        void SetColorScheme(object pLogpal);
    };

    [ComImport]
    [Guid("00000118-0000-0000-C000-000000000046")]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IOleClientSite
    {
        void SaveObject();
        void GetMoniker(uint dwAssign, uint dwWhichMoniker, ref object ppmk);
        void GetContainer(ref object ppContainer);
        void ShowObject();
        void OnShowWindow(bool fShow);
        void RequestNewObjectLayout();
    }

the thing is I can't get the SetClientSite(IOleClientSite pClientSite) to execute when my usercontrol is being loaded by IE. Am I missing a step here? I basically want to talk back to IE with my UserControl embedded on it.
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LVL 20

Expert Comment

by:Daniel Van Der Werken
ID: 17127477
Unless you're implementing events you want your user control to fire back at IE or JavaScript, you don't need to do anything.  It's automatic.  It took me a long time to figure this out myself.

Any public accessors or methods you have are available to IE via scripting.
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Author Comment

by:AlphaGuys
ID: 17132255
The thing is, the object is not embedded in IE using the <object> tag. It is embedded in IE through MIME (I associated my viewer(my .net dll) with a certain file type). When a user navigates to that file type, my control automatically shows up inside IE (like surfing on a pdf file and adobe reader spawns inside IE automatically). Now I want to capture the filename that made my usercontrol show, I guess this is by getting the LocationURL property of the Explorer but first, I need to get a reference of the container where my usercontrol is sitting, which is IE. I tried Container but it is null. I implemented the IOleObject but the SetClientSite is not firing. I think I'm missing something...
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LVL 20

Accepted Solution

by:
Daniel Van Der Werken earned 500 total points
ID: 17135171
Here's what I did to provide an interface for events from my user control.  Note this class is after the primary class:

    #region Additonal Classes and Interfaces
    /* New Class Definitions within the Namespace
       * They must be put down here otherwise we'll get
       * the "unable to find resource file" error.
       * Documented in:
       * http://support.microsoft.com/default.aspx?scid=kb;en-us;Q318603
       * */

    /// <summary>
    /// EC31E0EE-2339-4933-9621-FCD5E41B74C6
    /// Exposes the DocumentLoadCompleted event to JavaScript
    /// </summary>
    [Guid("EC31E0EE-2339-4933-9621-FCD5E41B74C6")]
    [InterfaceType(ComInterfaceType.InterfaceIsIDispatch)]
    public interface ICachingControlCOMEvents
    {
        /// <summary>
        /// OnReady Event Declaration
        /// </summary>
        [DispId(0x60020000)]
        void OnReady();

        /// <summary>
        /// OnFileReady Event Declaration
        /// </summary>
        [DispId(0x60020001)]
        void OnFileReady();

        /// <summary>
        /// NextDoc Event Declaration
        /// </summary>
        [DispId(0x60020002)]
        void NextDoc();

        /// <summary>
        /// PrevDoc Event Declaration
        /// </summary>
        [DispId(0x60020003)]
        void PrevDoc();

        /// <summary>
        /// NextPage Event Declaration
        /// </summary>
        [DispId(0x60020004)]
        void NextPage();

        /// <summary>
        /// PrevPage Event Declaration
        /// </summary>
        [DispId(0x60020005)]
        void PrevPage();
    }
    #endregion

Follow this template and see what happens.
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