Accessing and using an ActiveX from inside a HTML page hosted inside a WebBrowser con

adyrotaru · June 25th, 2009, 03:44 PM

Hi.

I have a page that is hosted by a WebBrowser control that is "hosted"
by a WinForms.
The page displays an ActiveX control.
I need, from C# code to access and manipulate the ActiveX control. I
already managed to get a reference to the HTMLObjectElementClass
object, but I need to somehow get the right reference to the ActiveX
object itself so that I will be able to invoke directly it's methods,
like:

myActiveX.Load();

To be more specific. Let's say we have this HTML page:

Code:

 
 
 
 
 

<html><BODY><table><tr><td><object classid=clsid: 464623dc-4d81-11dc-8314-0800200c9a66 id='myControl' width='660', height='500'><PARAM NAME='Host' VALUE='192.168.3.100'/>
<PARAM NAME='HttpPort' VALUE='80'/>
<PARAM NAME='RTSPPort' VALUE='554'/> 
<PARAM NAME='RTSPoverHTTP' VALUE='0'/>
<PARAM NAME='RTSPoverTCP' VALUE='0'/>
<PARAM NAME='VFormat' VALUE='96'/>
<PARAM NAME='G72640PT' VALUE='98'/>
<PARAM NAME='G72632PT' VALUE='97'/> 
<PARAM NAME='G72624PT' VALUE='99'/>
<PARAM NAME='G72616P' VALUE='100'/>
<PARAM NAME='AMRPT' VALUE='101'/>
<PARAM NAME='UIMode' VALUE='0'/>
<PARAM NAME='MediaUsername' VALUE='z'/>
<PARAM NAME='MediaPassword' VALUE='z'/>
</object>
</td>
</tr>
</table></body>
</html>

I get a reference to the hmtl element like this:

Code:

HTMLDocumentClass doc = webBrowser1.Document.DomDocument as mshtml.HTMLDocumentClass;
HTMLObjectElementClass myControl = doc.all.item("myControl", 0) as HTMLObjectElementClass;

From myControl I need to get a reference to the underlying COM object
with the appropriate type so that I can call methods like this:

Code:

myControlCOM.Load();

Thanks.

adyrotaru · June 25th, 2009, 04:01 PM

Quote:

Originally Posted by adyrotaru

Hi.

I have a page that is hosted by a WebBrowser control that is "hosted"
by a WinForms.
The page displays an ActiveX control.
I need, from C# code to access and manipulate the ActiveX control. I
already managed to get a reference to the HTMLObjectElementClass
object, but I need to somehow get the right reference to the ActiveX
object itself so that I will be able to invoke directly it's methods,
like:

myActiveX.Load();

To be more specific. Let's say we have this HTML page:

Code:

 
 
 
 
 

<html><BODY><table><tr><td><object classid=clsid: 464623dc-4d81-11dc-8314-0800200c9a66 id='myControl' width='660', height='500'><PARAM NAME='Host' VALUE='192.168.3.100'/>
<PARAM NAME='HttpPort' VALUE='80'/>
<PARAM NAME='RTSPPort' VALUE='554'/> 
<PARAM NAME='RTSPoverHTTP' VALUE='0'/>
<PARAM NAME='RTSPoverTCP' VALUE='0'/>
<PARAM NAME='VFormat' VALUE='96'/>
<PARAM NAME='G72640PT' VALUE='98'/>
<PARAM NAME='G72632PT' VALUE='97'/> 
<PARAM NAME='G72624PT' VALUE='99'/>
<PARAM NAME='G72616P' VALUE='100'/>
<PARAM NAME='AMRPT' VALUE='101'/>
<PARAM NAME='UIMode' VALUE='0'/>
<PARAM NAME='MediaUsername' VALUE='z'/>
<PARAM NAME='MediaPassword' VALUE='z'/>
</object>
</td>
</tr>
</table></body>
</html>

I get a reference to the hmtl element like this:

Code:

HTMLDocumentClass doc = webBrowser1.Document.DomDocument as mshtml.HTMLDocumentClass;
HTMLObjectElementClass myControl = doc.all.item("myControl", 0) as HTMLObjectElementClass;

From myControl I need to get a reference to the underlying COM object
with the appropriate type so that I can call methods like this:

Code:

myControlCOM.Load();

Thanks.

Hi all
Just found my answer here:

http://www.sahirshah.com/CSharp/objcall.html

Hope it helps.

samjudson · June 25th, 2009, 04:21 PM

I don't know if this would work, but it might be better (if it does work) to try using HtmlElement.InvokeMember:

Code:

HtmlDocument doc = webBrowser1.Document;
HtmlElement aX = doc.GetElementById("myControl");
aX.InvokeMember("Load");