host an activeX control from an activeX control? [modified] - COM Discussion Boards

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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:

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

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.

Converting a C++ COM object to .NET COM object

xavierakx6-Sep-07 17:51

xavierakx

6-Sep-07 17:51

Hi all,

I'm need of some quick help on this. Sorry that I haven't done much home work. I'm a little new to COM. But certainly appreciate any help.

I got a typelib file, that was generated by a VC++ project. It's a simple typelib. An ABC library, XYZ co-class and IXYZ interface.

Now, I got to write this code in .NET. I created a VB.NET project and added a COM class with the same name as the co-class in C++ - "XYZ". And I compiled. However, in the typelib, I get the default names for the library(the .NET project name) and interface ("_XYZ") . i.e., the library name and interface name are different in both the type libs.

I would like to know how in .NET we explicitly specify the library name and interface name too, so that I get exactly the same type lib in VC++ project.

That should be a simple one I guess.

Xavier

Re: Converting a C++ COM object to .NET COM object

Venkata Rama Subbarao11-Sep-07 14:39

Venkata Rama Subbarao

11-Sep-07 14:39

To Use COM Component in .NET you have to use tlbimp tool available in .NET

Re: Converting a C++ COM object to .NET COM object

xavierakx11-Sep-07 17:32

xavierakx

11-Sep-07 17:32

Thanks, but my doubt is not that. May I wasn't clear in explaining the problem.

When creating a COM class in .NET, the default interface generated in the typelib has the same name as class preceded with an underscore. if the class is ABC, it's interface will be _ABC. Do you know if we can override this.

Application crashes when CoCreateInstance is called in VS 2005 in Vista machine

sw@thi6-Sep-07 1:17

sw@thi

6-Sep-07 1:17

Here is the code that causes problem:

<br />
CComPtr<IUnknown> m_pMyComp;<br />
IUnknown* pUnkOuter = GetControllingUnknown();<br />
HRESULT hRes = CoCreateInstance(CLSID_MyComp, pUnkOuter, CLSCTX_INPROC_SERVER, IID_IUnknown, (void**)&m_pMyComp.p);<br />
if (hRes != S_OK)<br />
	return hRes;<br />

This code was ported from VS2003, it works in VS2003 but it crashes only in VS 2005 release mode. Any idea where the problem is??

Re: Application crashes when CoCreateInstance is called in VS 2005 in Vista machine

Hubert Mayer12-Sep-07 5:06

Hubert Mayer

12-Sep-07 5:06

What is the HRESULT ? Check additionally with the "dependency walker" whether all dependent dlls are available

GUID Creation

HakunaMatada5-Sep-07 18:53

HakunaMatada

5-Sep-07 18:53

How does GUID creation work? I mean how is the algorithm designed such that no two people on opposite corners of the world get the same GUID? Confused | :confused:

---

Hakuna-Matata Beer | [beer]

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

Re: GUID Creation

Michael Dunn6-Sep-07 15:25

Michael Dunn

6-Sep-07 15:25

See RFC 4122[^]

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

TlbImp is causing an error ?

AF_Ciphr5-Sep-07 5:27

AF_Ciphr

5-Sep-07 5:27

I have a file MYFile.WSC which is being used by as asp site, which i am converting over to .net (c#). Inorder to use this .WSC file i am going down the route of com interop so as .net can use the existing code, to save me recoding. I am generating a type library file by right clicking on it and selecting the option to generate one, i am then parsing this into TlbImp:

TlbImp C:\MYFile.tlb out:C:\MYFile.dll
Microsoft (R) .NET Framework Type Library to Assembly Converter 2.0.50727.42
Copyright (C) Microsoft Corporation. All rights reserved.

TlbImp : error TI0000 : System.SystemException - The type library importer encountered an error during type verification. Try importing without class members. :
System.TypeLoadException - The signature is incorrect.

There is no information on HOW to import without the class member???
thanks

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