I need a good book... - COM Discussion Boards

Maverick5-Feb-04 15:42

5-Feb-04 15:42

Hi!!

I've been reading your explanations thoroughly... and after reading your explanations, i tried a different search keywords to search for a solution.. So I tried the keywords "interface marshalling".. and guess what? i found a solution in microsft knowledge base.... They made a custom class for CProxy_EVENT class... so basically they supplied a header file.. and then i used that Custom class in place of CProxy_EVENT class generated by ATL Wizard.. and that's it, my code is working now... I forgot to Knowledge Base number but i will post it here soon.. But I guess you know that already?

Well thanks for the info, and i would like to have more information about COM and threads, apartment as i will have to use multiple com Objects soon...

thanks very much Big Grin | :-D

Re: Event handing problem.

Lim Bio Liong6-Feb-04 1:27

Lim Bio Liong

6-Feb-04 1:27

Hello Maverick,

That's great news, Maverick. By the way, I've also just finished my example program for you. But it's just as good that you have found a solution in MSDN.

However, if you should need my sample, please do not hesitate to email me directly. My email is :

bllim@singnet.com.sg

Best of Luck, Maverick,
Bio.

Reg: EnumConnectionPoints and IEnumConnectionPoints

Adi Narayana20-Jan-04 4:07

Adi Narayana

20-Jan-04 4:07

How to use the EnumConnectionPoints, IEnumConnectionPoints in connectable components

any example or sample which can help me out....

thanks in advance

kabir chugh

Re: Reg: EnumConnectionPoints and IEnumConnectionPoints

Jörgen Sigvardsson25-Jan-04 13:45

Jörgen Sigvardsson

25-Jan-04 13:45

IConnectionPointContainer* pCont;
pUnk->QueryInterface(IID_IConnectionPointContainer, (void**)&pCont);
 
IEnumConnectionPoints pEnum;
pCont->EnumConnectionPoints(&pEnum);
 
IConnectionPoint* pConnPoint;
while(pEnum->Next(1, &pEnum, NULL) == S_OK) {
    DoStuffWithConnectionPoint(pConnPoint); 
    pConnPoint->Release();
}

(error handling and irrelevant ->Release()'s omitted)

IEnumConnectionPoint follows the standard patterns as all IEnumXXX interfaces does. See the topic on IEnumXXX in the MSDN library.

--
<british-accent>Pass the jam, would you?

Structured storage and compound files

Omar Alvi20-Jan-04 2:04

Omar Alvi

20-Jan-04 2:04

Hmmm,

I have read this chapter "Structured storage and compound files" from not soo good INSIDE OLE by kraig. I am not able to compile the source code given with this chapter, it needs inole.dll which i can't seem to find.

So kindly tell me how to compile it or direct me to some other link etc where i can see a working example of "Structured storage and compound files" in C++ (not using mfc or ATL).

Thank you.

Re: Structured storage and compound files

Jörgen Sigvardsson25-Jan-04 13:49

Jörgen Sigvardsson

25-Jan-04 13:49

If you have MSDN library available then search for the index 'Structured Storage [Strctd Stg]' or see http://msdn.microsoft.com/library/default.asp?url=/library/en-us/stg/stg/structured_storage_start_page.asp[^]

It provides samples and is a good reference.

--
<british-accent>Pass the jam, would you?

IProcessInitializer / COM+

vlvl19-Jan-04 4:58

vlvl

19-Jan-04 4:58

I'm trying to implement the IProcessInitializer interface implemented in COM+ 1.5. I've implemented it in a COM+ DLL created in VC++ 6, using ATL objects, and included the comsvcs.h header file in my app.
When trying to run the object via ASP I get a 'No such interface supported' message. I'm running this on a Windows Server 2003 machine.
Any ideas?

I need a good book...

profoundwhispers19-Jan-04 3:17

profoundwhispers

19-Jan-04 3:17

I know nothing about COM, COM+, ActiveX, OLE or any of these technologies. I've never programed in Visual C++ before, and I have no intention in doing so. However, I have experience in Delphi and C#.

I need to know about COM, etc. Which book will help me grasp these technologies without delving into VC++?

Sammy

"A good friend, is like a good book: the inside is better than the cover..."

Re: I need a good book...

Jörgen Sigvardsson25-Jan-04 13:54

Jörgen Sigvardsson

25-Jan-04 13:54

Essential COM by Don Box is a good book. But I guess C++ knowledge is kind of a prerequisite for that book. Inside COM by Dale Rogerson.

But still, knowing C++ doesn't do you any harm to fully understand COM.

--
<british-accent>Pass the jam, would you?

Re: I need a good book...

Prakash Nadar25-Jan-04 22:17

Prakash Nadar

25-Jan-04 22:17

Jörgen Sigvardsson wrote:
But still, knowing C++ doesn't do you any harm to fully understand COM.

???

Tech.Support : Mam, is your pc running under windows?
Customer : No actually its close to the main door.

Re: I need a good book...

Jörgen Sigvardsson25-Jan-04 22:21

Jörgen Sigvardsson

25-Jan-04 22:21

COM evolved from C++ virtual table pointers. If you already understand the vtable concept in C++, you can often skip the first 2-3 chapters in a COM-book, and you don't have to give "the interface concept" a second thought as it's as natural as air. Wink | ;)

--
<british-accent>Pass the jam, would you?

Scriptable ActiveX and javascript

gialli19-Jan-04 2:04

gialli

19-Jan-04 2:04

Thanks to nice articles on the site I was able to get my COM project going nicely. I decided to do this without ATL/MFC as my needs are quite basic and I really want to understand what I'm doing. I'm not saying ATL/MFC are bad, I've worked with MFC for years so this really isn't about what's good and what's bad, I just chose this approach and try to live with my decision.

Enough of introduction, here's the problem. Being new to COM, I'm having some problems in adding support for every interface required by Internet Explorer to use it. IDispatch and invoke seem to work nicely, but do I need something more?

Do I need to mark the component safe for scripting if I sign the code?

Also, I need some interoperability with another ActiveX component, namely Macromedia Flash. I'd be happy to handle this via javascript functions, but how do I retrieve the scripting host and is there a solution which would work on other browsers than IE?

Re: Scriptable ActiveX and javascript

Anonymous30-Jan-04 10:54

Anonymous

30-Jan-04 10:54

If all you need is to invoke few methods in your component, then there is no need to implement other interfaces, IDispatch is enough (although ISupportErroInfo could be useful for error reporting)

Whether to mark it "safe for scripting" or not is up to you. If you won't, the IE behavour will depend on IE security setting "SCript ActiveX controls marked safe for scripting" : "disable", "prompt", "enable"

Edward

Interdev and COM

Davy Mitchell19-Jan-04 0:14

Davy Mitchell

19-Jan-04 0:14

Hi Folks,

If I declare an object tag with a class ID, I get statement completion in Interdev. If I use a ProgID I don't Frown | :(

I'd rather use PROGID's - any way around this?

Davy

My Personal Blog - Homepage.
Scottish News - Angus Blog, Perth Blog and Dundee Blog

Word Interop

Guinness4Strength18-Jan-04 19:09

Guinness4Strength

18-Jan-04 19:09

I've written a Word automation appilcation in C#, and I'd like to capture the OnClose Event....I know thats not the name but I don't know what else to cal it. Basically I open an instance of word and open a document, if the user tries to close the word window I'd like to create a small question dialog box, and thoughts ?

Save a CArray into the persistence of a ActiveX

ZeroCoolLP17-Jan-04 23:39

ZeroCoolLP

17-Jan-04 23:39

I'm developing a ActiveX in MFC Visual C++ 6.0 (Not ATL) and I have a serius problem and I can't find documentation in books or Internet.

How can I save a CArray into the persistence of a ActiveX????? (I mean in a PX_Blob function)

A Thousand Thanks.

Diego

Re: Save a CArray into the persistence of a ActiveX

Mike Dimmick19-Jan-04 0:25

Mike Dimmick

19-Jan-04 0:25

Serialize it to a CArchive?

You'd be better off asking in the Visual C++ forum.

Re: Save a CArray into the persistence of a ActiveX

ZeroCoolLP19-Jan-04 0:34

ZeroCoolLP

19-Jan-04 0:34

Yes Serialize to a CArchive and the pass the handle (HGLOBAL) of that archive to the PX_Blob.
And of course recover that CArray later. Smile | :)

Thanks.

Possible to dvlp COM/ATL C++ code in VS.NET?

michael thomas17-Jan-04 11:28

michael thomas

17-Jan-04 11:28

Hi,

I am currently using Visual Studio version 6.0 for C++/MFC development and I want to move to the new IDE Visual Studio .NET and continue learning COM and ATL C++ developlment.

QUESTION
Can I develop regular COM/ATL C++ code using the new VS.NET? I should say that I am new to COM programming so I don't want to make things more difficult.

So my question is really - I would like to continue the same C++/MFC/COM/ATL coding but using the new compiler and IDE. Is that possible, without too much grief?

Thanks

Mike

Re: Possible to dvlp COM/ATL C++ code in VS.NET?

Amit Dey24-Jan-04 11:47

Amit Dey

24-Jan-04 11:47

it's a breeze with VS.NET ATLCOM except the #import part.

Hush,hush...
thought I heard you call my name now.

Kula Shaker.

Amit Dey
Latest articles at CP -
Writing Word addins
Office addin

problem with __uuidof

emmatty17-Jan-04 0:04

emmatty

17-Jan-04 0:04

any 1 can help me what and when __uuidof is used in com
when i used it with _CommandBarButtonEvents when creating an add in for outlook 2000 it generated error "this class have no uuid associated with it" . but in ole object viewer i can see its uuid.

Re: problem with __uuidof

Abhishek Srivastava18-Jan-04 17:17

Abhishek Srivastava

18-Jan-04 17:17

can u write those lines of code whih u r using to get __uuidof ur event interface.

Abhishek Srivastava
Software Engineer (VC++)
India ,Noida
Mobile no 9891492921 Smile | :)

Re: problem with __uuidof

Anonymous30-Jan-04 11:09

Anonymous

30-Jan-04 11:09

__uuidof keyword extract guid assigned to an object via "uuid" attribute ((__declspec(uuid"...")). It's not always assigned. Usually headers generated by midl or "import" statement have such attibutes attached to the objects (interfaces, enums)
Check your header file that has a declaration of _CommandBarButtonEvents

Edward

Release in thread created by timer

Steve Schaneville15-Jan-04 17:39

Steve Schaneville

15-Jan-04 17:39

Got a problem, exhausted all of my ideas:

I have an MFC / ATL-com-server project. Upon final release, I want the COM object to wait for a timer to fire one last time and run it's thread to completion before unloading itself. Here are some attempts:

1) AddRef() in the com object and then once the timer thread has fired it's last time, Release() from that thread. This causes a crash in the main window of the app in CWnd::DestrowWindow function with this code:

		if (pWnd != NULL)
		{
			// Should have been detached by OnNcDestroy
#ifdef _DEBUG
			ASSERT(pMap->LookupPermanent(hWndOrig) == NULL);
#endif
		}

2) In the CSSLogCOM::InternalRelease() function (which I've overridden), wait for a flag to be set when the timer thread fires and completes with while(bWait) Sleep(1000);. This doesn't work because the timer won't fire once we're in this function! ???

3) I would try to post a WM_QUIT message to the main window, but the ATL server can host many copies of the same COM object in a single instance and if one of them posts the quit message, other running instances will be stopped early.

Anyone have any idea how I can "delay" the final release of a COM object from closing the ATL server until my worker thread has completed?

Thanks
~Steve

Re: Release in thread created by timer

Jörgen Sigvardsson15-Jan-04 21:58

Jörgen Sigvardsson

15-Jan-04 21:58

How about using CreateEvent/SetEvent/WaitForSingleObject/SignalObjectAndWait?

Create two events before the worker starts, one called "StopNow" and "DidStop". Let the worker thread do it's thing, periodically checking the "StopNow" event with WaitForSingleObject. When your server is about to terminate, make it use the function SignalObjectAndWait. This'll set the "StopNow" event, thus triggering the worker thread. It'll also make the server wait for the "DidStop" event. Meanwhile, the thread exits gracefully, but before finally quitting, it sets the event "DidStop", which will give the main thread clearance to continue termination.

// Server code
void OnTerminate() {
   SignalObjectAndWait(hStopNow, hDidStop, INFINITE, FALSE);
   ...
}
  
// Worker thread
void ThreadProc() {
   while(...) {
      ...
      if(WaitForSingleObject(hStopNow, 0)) {
         SetEvent(hDidStop);
         // clean up and exit         
      }
   }
}

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