Beginner In COM facing problem - COM Discussion Boards

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Re: Getting a ('support_error_info' : attribute not found) error

Nathan Holt at EMOM17-Sep-07 10:13

Nathan Holt at EMOM

17-Sep-07 10:13

I think for the "support error info" to work, you class has to implement ISupportErrorInfo, which allows a caller to request extra information about the last error.

Nathan

AxtiveX, this pointer [modified]

m1m216-Sep-07 10:38

m1m2

16-Sep-07 10:38

Hi,
it hapend something very strange to me, when i call 'this' from inside the activeX control class, when i debug project with 'activex test container', it work fine, but when i start the release with iexplorer, when call 'this' it seems to get not activex control pointer to DC, but pointer to desktop DC. Because when iexplorer is not maximized, in the center of screen, when call 'this', it starts to write on the top left corner on the desktop, outside of iexplorer.

I get this pointer and then construct CClientDC dc(this); I tought that maybe this is null and get desktop dc, but when put condition if(){}, this is not null and enter int brckets.

Thanks.

-- modified at 2:17 Monday 17th September, 2007

Can i use a dll in an activeX component?

just3ala215-Sep-07 10:04

just3ala2

15-Sep-07 10:04

Dear all, i'm developing an activex component to use in a web application. my task requires using a dll to do some work...
When i try to add it to the references of the project i get the message of "can't add a reference to the specified file"
I'm using Visual Studio 6 and vb6 as a language

Any help or hints would be appreciated

Thanks in advance Big Grin | :-D

Best Regards
3ala2 Smile | :)

Re: Can i use a dll in an activeX component?

Nathan Holt at EMOM17-Sep-07 10:17

Nathan Holt at EMOM

17-Sep-07 10:17

just3ala2 wrote:
Dear all, i'm developing an activex component to use in a web application. my task requires using a dll to do some work...
When i try to add it to the references of the project i get the message of "can't add a reference to the specified file"
I'm using Visual Studio 6 and vb6 as a language

It sounds like you are trying to add a reference to a dll that isn't a COM dll. VB6 does provide a way to access them, but it involves creating a module file and writing code to import all the functions that you need to call in the dll.

Nathan

Re: Can i use a dll in an activeX component?

just3ala217-Sep-07 12:26

just3ala2

17-Sep-07 12:26

I c

Thanx nathan, i found another dll that does the same job and can be added as a reference Wink | ;)

Best Regards
3ala2 Smile | :)

Difference between .idl and .h file?

Ash2014-Sep-07 0:23

Ash20

14-Sep-07 0:23

Hey ,

Can you please explain the diffrence between .idl and .h file?
Also How to create a new .idl file in VC6?

Thanks,
Ash.

Re: Difference between .idl and .h file?

Hubert Mayer14-Sep-07 4:58

Hubert Mayer

14-Sep-07 4:58

The idl-File is the input for the midl-compiler which creates an _i.c and .h file for further use. See MIDL-Compiler for more information. For creation of an idl-file use the ATLCOM-wizard in the VS.

Beginner In COM facing problem

GauranG Shah13-Sep-07 23:21

GauranG Shah

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:

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

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

Last Visit: 31-Dec-99 18:00 Last Update: 28-Apr-24 17:41

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