Question

ActiveX control with events sample

Asked by: alexey_gusev

I need to implement simple ActiveX object that can be used from JavaScript on Windows Mobile 5.0+ devices. This object should provide events so JS can hook up and perform something when eg. ActiveX object finished particular part of its task.

WM50 SDK does contain the sample (AXSample) that works fine with Mobile IE, but there is nothing about events there.

I would appreciate any samples or detailed guides on how to implement such object using VS2005 or VS2008. I suppose I'm missing something simple :) All I need is to report  from ActiveX back to JavaScript that some operation is completed with exitCode  = NNN without blocking calls. So step-by-step sample would be of great help .

BR,
Alex

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Asked On
2009-09-07 at 05:27:38ID24712489
Tags

ActiveX

,

Windows Mobile

Topics

Windows MobileProgramming

,

Handheld and PDA Programming

,

Mobile / Handheld

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Answers

 

by: pgnatyukPosted on 2009-09-07 at 05:39:43ID: 25274617

Have you seen SDK 6 samples?
There is wmpsample in PocketPC/ATL folder.
Sorry, if it is not enough. I'll be glad to help you. Last time I was working with COM was 4 years ago and don't want to check this subject now again. How I remember it worked fine, we just had to register this activex each time on start.

 

by: alexey_gusevPosted on 2009-09-07 at 05:52:13ID: 25274690

thanks for the answer, but no, that's not exactly what I want (I may be wrong of course :) )

that sample USES ax control, while I want my own control to fire custom event (or at least some events), so JavaScript from html page can do the following:

- create MyAXObject (which is done via html <OBJECT> tag)
- hook up to some event from above object, eg OnFinishedSomething
- call MyAXObject.startSomething(config)
- DO NOT wait at that point
- receive an event and handle it as required

I suppose I need to implement IProvideClassInfo and connection point container interfaces, this is done to some extent by ATL wizard. I lack the last simple step - add my own event to XXX_Events interface, get it visible for JavaScript and then use it there.

 

by: pgnatyukPosted on 2009-09-07 at 06:08:01ID: 25274799

May I suggest?
2 threads?
The main thread will use SetEvent for the second one and only this "second" will call FireOnFinish?
Or opposite - all works in a second thread - can be easier. But I've never made an activex for JavaScript. Sorry, if I'm totally wrong.

 

by: alexey_gusevPosted on 2009-09-07 at 06:32:29ID: 25274944

AXSample project in SDK is good enough sample :)

I feel I miss something fundamental here. As far as I understand it, what I need to do via ATL is that:

- add custom event to XXX_Events interface
- implement some connection point in my object class
- fire the event when I finished some operation
- subscribe somehow in JS to that event

If this looks sane, the sample doing it all would answer most of the questions. Perhaps I just need to experiment :)

 

by: pgnatyukPosted on 2009-09-07 at 06:36:29ID: 25274972

Yes. :) Good luck!

 

by: alexey_gusevPosted on 2009-09-08 at 12:41:11ID: 25285430

as per my previous post, the solution needed just proper guidance, so here's some recap of my web hunt:

- create ATL project, add ATL Control to it
- follow the wizard and ensure that "Support conection points" (and IObjectWithSite probably too) it supported (ie included in inheritance list of your object)
- add required methods to ATL control (via IXXXCtrl interface)
- add a method to _XXX_Events interface
- add the following to stdafx.h to make it compile:

#define _CE_ALLOW_SINGLE_THREADED_OBJECTS_IN_MTA

- build the project - at this stage CProxyXXX_Events will be created, idl file is compiled etc., CProxyXXX_Events will have Fire_YourEvent() methods
- add connection point to your object class - ie select _XXX_Events in the left-most list
- fire the event when required - I needed to fork a thread, but since the object is Single Threaded, inter-thread will fail, so I had to implement a timer and fire the event from there
- subscribe to this event in JS (for instance as in the following snippet), where startMe() is the method in AX and OnStartMeFinished() is an event fired from AX:

<SCRIPT LANGUAGE="JScript">
function startAXMethod()
{
    Launcher.startMe();
}
function Launcher::OnStartMeFinished(exitCode)
{
   alert("OnStartMeFinished() with " + exitCode);
}
</SCRIPT>

I suppose that if I implement the IDispatch-type property in AX, it will be possible to use 'regular' JS syntax:

MyObj.OnStartMeFinished = function(exitCode) { alert("OnStartMeFinished() with " + exitCode); };

 

by: pgnatyukPosted on 2009-09-08 at 12:48:15ID: 25285491

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