How will you talk with Activex or COM(could be created in MFC) From C#? - COM Discussion Boards

GauranG Shah13-Sep-07 23:21

13-Sep-07 23:21

I am learning COM. And has come to know about one of the Advantages of the COM over .dll file. That

It extends the functionality of (client)application without rebuilding.

I.e. If you make the changes in function of .Dll File which client application is using you need to recompile the application. But if you are using the COM you dont need to do recompilation of client application Smile | :)

But How ?? Confused | :confused:

afterall the COM ( inprocess COM) is also a .dll

Re: Beginner In COM facing problem

DevMentor.org16-Sep-07 22:34

DevMentor.org

16-Sep-07 22:34

Well you don't necessarily have to rebuild the entire app that is using a dll when it changes. Think about how Microsoft provides patches or updates to DLLs. Do you need to rebuild your OS to use the new DLLS Big Grin | :-D

As long at the function interface does not change you don't need to worry about rebuilding the app that uses the DLL.

COM provides interfaces that other app use. As long as the interface is not changed everything will be fine if the COM object has some code changes.

Let's say a code of a COM interface was modify like a bug fix, then the app using the old COM object will be able to use the new COM object because all it needs to do is CoCreate the COM object and Query for it's interface. This part remains the same in the app, so the app doesn't need to be changed.

Yours Truly, The One and Only!
---
Rajinder Yadav
devmentor.org

From where to Start......... ???

GauranG Shah13-Sep-07 2:36

GauranG Shah

13-Sep-07 2:36

I m thinking to learn COM but not getting from where to start ?. If u know about any good book please tell. If you can provide the link to the Ebook it will be gr8 HELP!.

Thnx in Advance.

Re: From where to Start......... ???

Michael Dunn13-Sep-07 10:08

Michael Dunn

13-Sep-07 10:08

Introduction to COM - What It Is and How to Use It[^]

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | PimpFish | CP SearchBar v3.0 | C++ Forum FAQ

"That's what's great about doing user interface work. No matter what you do, people will say that what you did was idiotic." -- Raymond Chen

Re: From where to Start......... ???

GauranG Shah13-Sep-07 20:23

GauranG Shah

13-Sep-07 20:23

Thnx but I have already read this article b4 and other aricles from the codeproject.com. So if u know about any good Book which have explained COM in Depth please tell me.

Re: From where to Start......... ???

Michael Dunn13-Sep-07 22:15

Michael Dunn

13-Sep-07 22:15

Essential COM by Don Box.

--Mike--
Visual C++ MVP Cool | :cool:

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I work for Keyser Söze

Re: From where to Start......... ???

User 21559713-Sep-07 23:37

User 215597

13-Sep-07 23:37

Essential COM - by Don Box
you may also want to look at
Inside COM - by Dale Rogerson

Sohail

modified 21-Apr-21 21:01pm.

How will you talk with Activex or COM(could be created in MFC) From C#?

spalanivel12-Sep-07 21:36

spalanivel

12-Sep-07 21:36

Hi,
How will you talk with Activex or COM(could be created in MFC) From C#?
Plzz send me ur valuable suggestions to me as soon as possible...Thanks to u..What is CCW and RCW?How to use it?

spalanivel

Re: How will you talk with Activex or COM(could be created in MFC) From C#?

User 21559713-Sep-07 1:08

User 215597

13-Sep-07 1:08

To start with, refer http://www.codeproject.com/dotnet/COM_DOTNET_INTEROP.asp[^]

Sohail

modified 21-Apr-21 21:01pm.

Re: How will you talk with Activex or COM(could be created in MFC) From C#?

spalanivel13-Sep-07 20:10

spalanivel

13-Sep-07 20:10

Thanks for ur information.. and if any coding related to these it will be more useful...

Re: How will you talk with Activex or COM(could be created in MFC) From C#?

User 21559713-Sep-07 23:43

User 215597

13-Sep-07 23:43

http://msdn2.microsoft.com/en-us/library/sd10k43k(VS.80).aspx[^]

Google/Live should help with right search keywords Smile | :)

Sohail

modified 21-Apr-21 21:01pm.

Re: How will you talk with Activex or COM(could be created in MFC) From C#?

spalanivel2-Oct-07 5:30

spalanivel

2-Oct-07 5:30

Thanks Sohail....

How to use a COM but with no .h files

kcynic12-Sep-07 19:50

kcynic

12-Sep-07 19:50

I have a COM component with no .h files.
I want to use,but how should I begin?

Thanks.

GOOD LUCK!

Re: How to use a COM but with no .h files

User 21559713-Sep-07 0:56

User 215597

13-Sep-07 0:56

IDispatch can help
or
use #import[^] on the Type library which could be a seperate file or embeded in the COM server DLL

Sohail

modified 21-Apr-21 21:01pm.

Re: How to use a COM but with no .h files

kcynic14-Sep-07 19:37

kcynic

14-Sep-07 19:37

Thanks very much.But I am a beginer of COM,would you like to give me a demo of such task?

GOOD LUCK.

host an activeX control from an activeX control? [modified]

steve_c_davis12-Sep-07 5:03

steve_c_davis

12-Sep-07 5:03

Some interfaces in Windows Media Player are only available by using a "remote" host. I'd like to remote the player control from my OCX which is embedded in IE. I am searching for way to get a reference to a container that would support IObjectWithSite (ideally IE itself) to set up my remote host object in order to create the remoted WMP instance... any assistance, ideas or comments would be greatly appreciated.

Addition: BTW all this works fine when done from an MFC app... but I can't get a container reference in the OCX.

-- modified at 12:10 Wednesday 12th September, 2007

Re: host an activeX control from an activeX control?

steve_c_davis13-Sep-07 5:33

steve_c_davis

13-Sep-07 5:33

Here's exactly what's going wrong -

// from the header file
CAxWindow *m_pView; // Host container to hold remoted WMP

// in the class
CComPtr<IAxWinHostWindow> spHost;
RECT rectWMP={1,1,1,1};

AtlAxWinInit();

m_pView = new CAxWindow();
hr = m_pView ? S_OK : E_OUTOFMEMORY; // succeeds

	
if(SUCCEEDED(hr))
{
    MessageBox(_T("Got AxWindow"), _T("WMP Container"), MB_OK);
    m_pView->Create(m_hWnd, rectWMP, NULL, WS_CHILD);

    hr = ::IsWindow(m_pView->m_hWnd)? S_OK : E_FAIL; // fails
}

Is it clearer what is going on from that? (this same code works fine in a local app)

Incorrectly formated message url in OnSyncSave

Ashish Vasudev12-Sep-07 3:29

Ashish Vasudev

12-Sep-07 3:29

Hi All,

I am trying to retrive message from a computer that is running Microsoft Exchange Server
using OnSyncSave(IExStoreEventInfo pEventInfo, string bstrURLItem, int lFlags)
The bstrURLItem i am getting is of this format
file://./backofficestorage/London.ukproject.com/
Public Folders/Exch test msg-87539250.EML

The message subject given was Exch test msg

Why are these numbers appended to Message Subject ?

Ashish Vasudev

Beginner COM

Kuryn11-Sep-07 9:10

Kuryn

11-Sep-07 9:10

I would like to learn COM to use in WTL. But I can't find no tutorials that are up to date for C++. Frown | :(

And actually goes through it all. And not just skip around expecting you to know everything.

Re: Beginner COM

Michael Dunn13-Sep-07 10:10

Michael Dunn

13-Sep-07 10:10

Have you seen Introduction to COM - What It Is and How to Use It[^]?
And you don't need to know COM before starting with WTL.

--Mike--
Visual C++ MVP Cool | :cool:

Registry

john563210-Sep-07 19:46

john5632

10-Sep-07 19:46

Hi Experts,
How can I check for particular version of MS-Outlook from registry value.

Thanx in advance.

How to create a proxy/stub dll for a odl( which has come with MFC dialog based application with automation support)

Kishore JP10-Sep-07 0:58

Kishore JP

10-Sep-07 0:58

Hello All,
I have a problem.
My application is a MFC AppWizard(exe) project and Dialog base application with automation support.
This automation support feature provides a odl file and we have exposed some functions using this odl file.
Now we want to place this interface pointer in the ROT.
I have placed the interface pointer in the ROT, and able to retrieve the same in the same process.

Problem started when I retrieve the same interface pointer from ROT in a different process ( other than my process), it is not finding this interface at all in the ROT ( but the moniker is presented in the ROT).

I got to know that this is the problem of not having proxy/stub dll for my application.

Now my question is how to create a proxy/stub dll for this odl file.

Regards
Kishore

How to write directly in COleStreamFile(would be serialized in Structured Storage)?

oleg637-Sep-07 11:28

oleg63

7-Sep-07 11:28

How to write directly in COleStreamFile(would be serialized in Structured Storage)?

Thanks.

Using COM in a scenario.

HakunaMatada6-Sep-07 19:09

HakunaMatada

6-Sep-07 19:09

Hi,

I have a small problem. Hope you guys help me solve it. Here goes...

I have a base class BASE and three classes derived from BASE, namely A, B and C. BASE contains properties and functions common to A, B and C. Now, I have to create multiple instances of A, B and C and store them together. So what do I do? I create an array of BASE pointers and a variable which signifies the type of derived class the BASE pointer holds so that whenever I need a derived class, I just get the pointer and type from the Array and upcast it to its concerned class. Is this a good design?

Now I have to implement the same using COM components. I have to expose BASE, A, B and C via COM interfaces and create the component such that when ever I get a BASE component, just by looking at the type, I can Query it for the appropriate Interface. Is the correct way of solving such a problem or is there a better way to do it?

Thanks..

---

Hakuna-Matata Beer | [beer]

It means no worries for the rest of your days...
It's our problem free, Philosophy
Jig | [Dance]

"I think my response was 'What idiot dreamed this up?'" -- Mary Ann Davidson, Oracle's chief security officer, in typical blunt manner, remembering her reaction to the company's scheme to brand its databases as "unbreakable."

Re: Using COM in a scenario.

Hubert Mayer12-Sep-07 5:04

Hubert Mayer

12-Sep-07 5:04

I would say yes, store the COM-Objects with IUnknown- or your BASE-Interface and query for the disired Interface.

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