Using COM in a scenario. - COM Discussion Boards

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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

ActiveX - open file error

m1m24-Sep-07 10:18

m1m2

4-Sep-07 10:18

Hi,
i write one activex, it have one property that receive string with file name to open. I open my activex through iexplorer. AxtiveX is writen on VC++ 2005

Problem is that wherever i put my .html file in diferent folders it always search for the file in the folders that activex was started for the first time.

My file looks like this

<object 	<br />
	width=450	height=250 <br />
	classid="clsid:BB4DE790-ED91-44ED-87BC-2B0811F56DFB" ><br />
	< param name="source_file" value=".\aa.txt" ><br />
</object><br />

Help

Failed to import COM dll in C++ into C# in .NET 2005

Jack Rong4-Sep-07 5:50

Jack Rong

4-Sep-07 5:50

It works fine in previous version until we decide to use .NET 2005. The C# project failed to add reference of COM Dll in C++ with the error message:

A reference to "../whatevername.dll" could not be added. Please make sure that the file is accessible, that it is a valid assembly or COM component".

Please help.

Jack Rong

Re: Failed to import COM dll in C++ into C# in .NET 2005

myshketer5-Sep-07 2:50

myshketer

5-Sep-07 2:50

You should make Interop.whatevername.dll file and add it to your project. Some tools provide by VS2005 will help you. Look for TLBEXP.EXE

DCOM Server question

PaulCammy3-Sep-07 11:31

PaulCammy

3-Sep-07 11:31

I have written an ATL COM server in a DLL with merged proxy/stub using Visual Studio 2005. It can sometimes be used locally and other times remotely. Deploying locally is straightforward and I've now got a client using it that way. However I've been wading through all sorts of internet articles, discussions etc. about how to deploy, debug, and use the component remotely, but to no avail.

I need to be able to deploy and debug on a remote machine via peer-to-peer and/or ethernet switched networks, including guidance on how to configure the security correctly on Windows XP Prof. with SP 2. I've got to believe there is a 'step by step' guide on how to do this, but I haven't found one yet.

Please can anyone help.

Thanks.

Re: DCOM Server question

Hubert Mayer14-Sep-07 5:13

Hubert Mayer

14-Sep-07 5:13

Hey,
i always register my dll in com+ as application. Than you can export this application in a msi file. You can deploy for clientside and serverside. The security thing is a try and error. Good luck Wink | ;-)

Implementing IDownloadManager & download() method..

p33ks3-Sep-07 3:54

p33ks

3-Sep-07 3:54

Hi,

I want to create an IE plug-in where whenever a download dialog is expected, the file is downloaded automatically to a specified folder - the dialog should should not appear.

Has anyone worked on something similar? Is such a thing work be possible to do w/out extensive COM/IE/ATL/OLE knowledge?

I am somewhat familiar with C++ & COM/ATL/OLE concepts.
From the MSDN docs, I also know that I just need to create a COM object which implements a couple of interfaces and register it.

But, am absolutely clueless where to begin & how to get to that. (Never used the Visual Studio)

Any helpful pointers plz ?

Thanks,
-pk

csExWBv2.0.0.2 + TrueDownloaderIE

xinkmt7-Dec-11 16:08

xinkmt

7-Dec-11 16:08

merge code

MSWord COM Addin problem

Tarek Jabri3-Sep-07 2:09

Tarek Jabri

3-Sep-07 2:09

Hi i developed a com addin for msword in MFC
i have done the registration issues for it ,and i added a menu item for invoking the addin functionality , so it is registered and working properly when i open NEW word document.

the problem occurs when i OPEN an already saved word document, when i click the menu item the famous error message appears "Microsoft office word has encountered a problem and needs to close, we are sorry for the inconvience"

when i work on a new word document i can attach to the word process and debug but when i work on an opened word document i can attach but the break points are not active

can anyone give me any hint?

thanks alot

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