COM Discussion Boards

ActiveX storing data to be picked up by another ActiveX later?

SysLo23-Mar-04 0:57

23-Mar-04 0:57

I'm developing an ActiveX component, which is used on web pages. When user enters a page page, the ActiveX is loaded and when the user moves to another page, the activeX component terminates.
However when user goes to another page, I must be able to transfer some data from the current instance of the ActiveX component to the next instance of it.

I'm currently using cookies for this, but that is not a good solution for various reasons. What other ways are there to transfer the data? Confused | :confused:

Is there some windows interface (servic) which I can use to temporarly store data, so that the data can then later be picked up by another ActiveX instance.

Re: ActiveX storing data to be picked up by another ActiveX later?

igor196024-Mar-04 15:01

igor1960

24-Mar-04 15:01

Why can't you use local file? Temporary folder maybe good place...
You can also overload OnFinalRelease or add extra LoadLibrary, so instance of your control or module will continue to stay in memory, even after IE Document Releases it...
Also, as I recall CoFreeUnusedLibraries implemented by MSFT has a delay unload time of about 10 minutes -- so you can just use that -- your module stays in memory for 10 minutes, even after last instance of your control is realeased. So, you can use that by storing shared data as a static data or member of CWinApp class...
Also, you can implement your own DllCanUnloadNow(void) -- just return S_FALSE -- that will guarantee that your module will stay in memory forever...

"...Ability to type is not enough to become a Programmer. Unless you type in VB. But then again you have to type really fast..."
Me

Re: ActiveX storing data to be picked up by another ActiveX later?

SysLo25-Mar-04 1:49

SysLo

25-Mar-04 1:49

The static member idea seems like a good choice (tested, and seems to work). I'll still have to test the other ideas.

But, thank you...

I am unable to retrieve Combuilder in Matlab

vil_0922-Mar-04 20:08

vil_09

22-Mar-04 20:08

i tried by typing comtool in matlab command window, but the matlab com builder window did not appear. the version of matlab which i m using is 5.3. can someone help me about this problem.

bhavsar vishal
pgdem, be
iiem-india

What are issues when renaming a COM component?

User 21559722-Mar-04 17:42

User 215597

22-Mar-04 17:42

Hi there,

I have created a COM component using C++ which is already installed on my system and is being used by few applications.
I want to know what issues i'll have to consider if I wish to have this same DLL with a different name on my system.
I mean if I rename this DLL and install it , apart from changing the CLSID , ProgId what all things I'll need to change in this DLL if I wish to have both my DLL's to be registered on my system.

Any thoughts?

Thank You.

Have a nice day!

modified 21-Apr-21 21:01pm.

Re: What are issues when renaming a COM component?

Steve S22-Mar-04 22:07

Steve S

22-Mar-04 22:07

If you want side-by-side, then you need to regenerate all the UUIDs in the IDL file, change the progids and interface names (don't forget the information in the RGS file).

Why would you want both?

If you want to change behaviour, just add a new interface that derives from the old one (for backward compatibility, and the fact that interfaces are considered immutable once 'published').

Steve S

Re: What are issues when renaming a COM component?

User 21559723-Mar-04 0:00

User 215597

23-Mar-04 0:00

Thanx.
Actually I am a new to COM technology... by this question I wanted to get some of my doubts clear.

I totally agree with what you said regarding "change behaviour".

Now I think i got to know what i wanted.
Actually had thought about what u said but wanted to confirm from someone more experienced and am now satisfied after your answer.

Thank you once again.

Have a nice day!

modified 21-Apr-21 21:01pm.

use VB COM in C++

Cuu22-Mar-04 5:18

Cuu

22-Mar-04 5:18

hi,
I have a COM in VB. How do I use it in C++
thanks

Re: use VB COM in C++

Nick Parker22-Mar-04 18:07

Nick Parker

22-Mar-04 18:07

You can use the Class Wizzard and import from a Type Library. This should generate the appropriate classes for you in C++ that will inherit from COleDispatchDriver. You will need to make sure you call CreateDispatch when you create an instance of the object in C++. Check MSDN for more details.

- Nick Parker
My Blog | My Articles

How to register a proxy/stub DLL on the client?

pelos21-Mar-04 10:54

pelos

21-Mar-04 10:54

hi!

I have developed a DCOM component server with ATL but now, how can i registeter it on a client?

Thanks in advance.

Re: How to register a proxy/stub DLL on the client?

pelos21-Mar-04 21:07

pelos

21-Mar-04 21:07

hi!

I know yet how to register the DLL. If there is somebody with this problem this is a very little tuto:

On the server machine

1.- register the server program:
c:\> remoteServer -regserver
where remoteServer is the name of the EXE server.

2.- register the proxy/stub DLL:
c:\> REGSVR32 remoteServerps.dll

On the cliente machine

1.- Copy RemoteServerps.dll on the client machine

2.- Register the proxy/stub DLL:
c:\> REGSVR32 remoteServerps.dll

ok, with these steps my DCOM application runs ok but i'm not sure if is this the best way to do the registration. Are there any other possibilities ?

thank you in advance!!

Re: How to register a proxy/stub DLL on the client?

Nissim Salomon23-Mar-04 0:49

Nissim Salomon

23-Mar-04 0:49

Hi
1.Register your component under the component services (MTS)
2.Use the export operation in order to create proxy\stub setup file
3.Install the file in the client machine

ActivesX design questions

Cedric Moonen19-Mar-04 1:03

Cedric Moonen

19-Mar-04 1:03

Hello !!

I want to convert an object I designed as a custom control in Visual C++ in a ActiveX version. This object is a chart that can display high speed data.

I succesfully converted the control but the problem is for adding new points: I don't want to redraw the complete control (this takes toooooo much time) so I want to get the dc of the control, use a transparent background and plot the line (or point). But this doesn't work if I call the COleControl::GetDC member function (default parameters).

How can I get a dc whenver I want ?? (so, not when OnDraw is called).

And if someaone could send me some example of ActiveX controls this would be great: this is the first time I design ActiveX and this project is REALLY urgent Dead | X|

Thanks a lot for any help (any clue, hints, ... are really welcome Smile | :)

)

Re: ActivesX design questions

Cedric Moonen19-Mar-04 2:10

Cedric Moonen

19-Mar-04 2:10

Ok !
I've found the solution Smile | :)

!

In fact, I added a Method to add these points and I tested the control in the ActiveX control test container. I was invoking the method inside the application. But this seems to work differently... Don't know why Confused | :confused:

For example if I call this inside my control on a mouse down message,everything works fine...

Why ????

Anybody know the future of MMC ?

Richard John18-Mar-04 18:15

Richard John

18-Mar-04 18:15

I'm considering building an MMC (Microsoft Management Console) snap-in. The only information I've found for doing so is the Feb 2003 Platform SDK, where the C++ examples are still from VS6. The VB6 designer for MMC is long gone, and the ATL wizard for MMC was removed from VS.NET (I've heard rumors it was buggy). Which leaves me with the old guts and glory style of raw C++ COM programming. Given the examples in the SDK, that kind of adventure is OK provided there's a real future for MMC.

Does anybody know if Longhorn will still use MMC? Will ATL get a new MMC wizard in Whidbey? Any rumors from Microsoft? Are there any good newsgroups for MMC?

Any hints will help me here - Thanks,

Richard

Re: Anybody know the future of MMC ?

Heath Stewart25-Mar-04 6:08

Heath Stewart

25-Mar-04 6:08

It's still in the PDC build of "Longhorn". I doubt Microsoft would abandon it yet, though. It still serves a good purpose and uses the ubiquitous tree that everyone loves.

I know they recently acquired a new project for remote server maintenance, but this doesn't seem to overlap with problems solved with MMC.

Microsoft MVP, Visual C#
My Articles

Drag Stream -> Drop File

Tristan Rhodes18-Mar-04 12:32

Tristan Rhodes

18-Mar-04 12:32

How would I go about converting a dragged stream object, into a dropped file object? The stream would be a stream of bytes dropped into the windows shell (explorer / desktop etc).

I get the impression I would need to implement my own DataObject that implements IDataObject, and load it with the appropriate STGMEDIUM and FORMATETC structs representing a stream.

Then, when dropped, a new file object needs to be created exposing some storage interface (IPersistStorage, or IStorage?), and then this needs to be given the IStream interface of the stream that is being dropped into it. Following that, i'm assuming windows shell can handle it.

How close am I?

(Note: The drop source is a wrapped managed C# interface, i can create a new stream object implementing the IStream interface, and read in my serialized bytes to it. The problem above is where i go from there.)

Cheers

Cata

Re: Drag Stream -> Drop File

Heath Stewart25-Mar-04 3:50

Heath Stewart

25-Mar-04 3:50

Again, you're making this much too hard. The implementation of the IDataObject is nothing more than a way to encapsulate all the information about an object being dragged (or copied to the clipboard).

The STGMEDIUM and FORMATETC structs describe how the data is contained, and what the data is, respectively. You provide either an IStorage (not IPropertyStorage, which is very different) or an IStream implementation in the STGMEDIUM, as well as setting the tymed field to the associated enum type. Set the clipboard format in the FORMATETC struct. Pack your data and these structs into your IDataObject implementation and call DoDragDrop with that, your IDataSource implementation (which you can easily create from a .NET

Control</cod> since I know that's what you're after), also specifying your allowed effects.<br />
<br />
When a possible drop target gets the drag over event, it looks at the <codE>FORMATETC

and allowed effects to see whether or not it can except it. It may also look at the STGMEDIUM to see if it can accept data passed along in those formats (the shell should handle all of them just fine). It then alerts the drag that it can accept them. If a user drops the data, the drop target gets the storage object from STGMEDIUM and handles it appropriately. If it's a filename, it would copy, move, or link them (depending on the effects). If it was an IStream implementation, it would get information about the stream and Read till done. If it was locked in global memory it copies it out and frees the global memory. So on, so forth.

Microsoft MVP, Visual C#
My Articles

Encapsulating an ActiveX inside an ActiveX

Cedric Moonen18-Mar-04 3:24

Cedric Moonen

18-Mar-04 3:24

Hello ! I use the MFC ActiveX ControlWizzard

I'm really new to ActiveX development. I want to know if it is possible to have another ActiveX in the current ActiveX I'm developping (like a class member of the Ctrl class) ? If yes, how (and when) do I have to create the control ???
I'm a little bit lost Dead | X|

And by the way, if you have some links to good tutorials, they are welcome Smile | :)

!

Thanks!

Re: Encapsulating an ActiveX inside an ActiveX

Prakash Nadar18-Mar-04 5:13

Prakash Nadar

18-Mar-04 5:13

Yes use the composite controls.

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prakashnadar@msn.com

Re: Encapsulating an ActiveX inside an ActiveX

Cedric Moonen18-Mar-04 20:11

Cedric Moonen

18-Mar-04 20:11

Thanks for the response...
Hum, sorry but can you be more specific ?? I'm really new to this and I really don't know what is composite controls...

Thanks

Re: Encapsulating an ActiveX inside an ActiveX

Prakash Nadar19-Mar-04 14:34

Prakash Nadar

19-Mar-04 14:34

A search on MSDN will give you the sol and that would be muct detailed explanation. Smile | :)

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prakashnadar@msn.com

Rebuild my dialog-app to ActiveX?

anderslundsgard17-Mar-04 21:33

anderslundsgard

17-Mar-04 21:33

I have written a quite complex dialog-project using MFC C++. Now I would like to distribute it on the net. My only thought is to “convert” it to an ActiveX but are there any other good ways?? Pleased for suggestions.

If an ActiveX is the “best” solution, how to make it quick?

.....and justice for all

APe

a little problem with an RGS file

zilch16-Mar-04 14:33

zilch

16-Mar-04 14:33

ok, i got the com object to register using the

<br />
DECLARE_REGISTRY_RESOURCEID<br />

macro

however there was something wrong with the RGS file that made it unable to unregister it. please look at this RGS file:

HKCR
{
	NoRemove AppID
	{
		'%APPID%' = s 'TestAgent'
		'TestAgent.DLL'
		{
			val AppID = s '%APPID%'
		}
	}
	NoRemove Folder
	{ 
		NoRemove ShellEx
		{
			NoRemove ContextMenuHandlers
			{
				ForceRemove TestAgent = s '{7BA0D1BF-0B50-4B3A-B8E5-229B9D97C282}'
			}
		}
	}
	NoRemove *
	{
		NoRemove ShellEx
		{
			NoRemove ContextMenuHandlers
			{
				ForceRemove TestAgent = s '{7BA0D1BF-0B50-4B3A-B8E5-229B9D97C282}'
			}
		}
	}
}

it's the first section (NoRemove AppID) that is causing the problem making ATL unable to UNregister the server. It has no problem registering it. That part is generated automatically by Visual Studio. Removing it fixes it. Why doesn't it work? Is it needed?

on a side-note, how did i find out? by manually overriding DllRegisterServer and DllUnregisterServer, i found out that this call failed:

if( this->UpdateRegistryFromResourceS(IDR_TESTAGENTPROJECT, FALSE ) != S_OK )
{
    MessageBox( NULL, "ureg bad 2", "!", 0 );
    return false;
}

the counter-part, registering, went flawlessly... really wierd for me..

thanks, appreciate the help.

IBidiSpl COM interface

Ankwa16-Mar-04 9:38

Ankwa

16-Mar-04 9:38

How can i use the IBidiSpl COM interface in either VB.NET or C#.NET.
My major problem is knowing which type library that defines the interface because i have gone through the documentaion in the msdn with the hope that i will get a clue but no way.
I would welcome any suggetion that will enable me know the type library that implement it.

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