Re: global variables in COM - COM Discussion Boards

7-Mar-07 18:08

Ok, I plead guilty for using global variables in a COM project of mine.
I know global variables are bad but sometimes it's hard to avoid.

My question is: Can I have some "global in the instance scope only" kind of variables? That is, inside the instance the variables are global, every class can see them. But each instance of the object has its own set of individual "global" variables.

Is it possible to work around this?

__________________________

S.C.

Stephen Hewitt7-Mar-07 18:31

Stephen Hewitt

7-Mar-07 18:31

To me this sounds like a contradiction in terms: if “each instance of the object has its own set of individual "global" variables” then they're not global!?!?

Steve

CPallini7-Mar-07 21:00

CPallini

7-Mar-07 21:00

S.C.Wong wrote:
My question is: Can I have some "global in the instance scope only" kind of variables? That is, inside the instance the variables are global, every class can see them. But each instance of the object has its own set of individual "global" variables.

Do you write global to mean public?

Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

S.C.Wong7-Mar-07 21:29

7-Mar-07 21:29

No. I mean a global variable which doesn't belong to any class. (Quite similar to a static variable. ) Like the "theApp" variable in those wizard-generated MFC project.

Lets say I have an ActiveX control called MyCtrl.

Now I insert two of MyCtrl in an dialog:
CMyCtrl1 m_ctrl1;
CMyCtrl2 m_ctrl2;

And somewhere in MyCtrl there is a global variable int g_nVariable.
The global(or static) variable g_nVariable is shared by m_ctrl1 and m_ctrl2. There is only one copy of g_nVariable.

All I want is a global variable, but of which each instance og the control has its own copy.

If I can get a pointer to the "active instance of COleControl", I can solve the problem too.

Sorry for my lousy English as it's not my first language and I am too frustrated... Smile | :)

__________________________

S.C.

CPallini8-Mar-07 0:48

CPallini

8-Mar-07 0:48

Why don't you use just a class member static variable?

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

Stephen Hewitt8-Mar-07 1:24

Stephen Hewitt

8-Mar-07 1:24

S.C.Wong wrote:
All I want is a global variable, but of which each instance og the control has its own copy.

Again I ask the question: if each instance has its own copy how is it global since, by definiton, all instances share the same globals?

Steve

Dumb Programmer8-Mar-07 20:01

Dumb Programmer

8-Mar-07 20:01

If the object is not having GlobalMultiUse instancing automatically the object will have its own copy of global variables. No doubts in this regard.

S.C.Wong9-Mar-07 0:58

9-Mar-07 0:58

How to set the instancing property in MFC activeX? Thanks.

__________________________

S.C.

S.C.Wong9-Mar-07 1:14

Getting Window Handle of an Explorer Band

9-Mar-07 1:14

Just found it. It's CoRegisterClassObject(). Thanks everyone who replied. Smile | :)

__________________________

S.C.

georgekjolly5-Mar-07 21:10

georgekjolly

5-Mar-07 21:10

Hai all.

I have created a Toolbar for Internet Explorer.

I need to get the window handle of an Explorer Band(Created by me) in my tool bar.

I know the class ID of the Explorer Band, and I am able to hide and unhide the Explorer Band using that Class ID , from the toolbar using ShowBrowserBar(&vtBandGUID, &vtShow, 0); function.

But for my purpose, I need to get the window handle of the Explorer Band

How I can Get the window handle?? .

Please Help me

Thanks
George

Re: Getting Window Handle of an Explorer Band

prasad_som5-Mar-07 22:28

prasad_som

5-Mar-07 22:28

IWebBrowser2::get_HWND gives you handle to main explorer window.
Use EnumChildProc,enumerates children using this handle. You should get any window you want.

Prasad
Notifier using ATL | Operator new[],delete[][^]

Re: Getting Window Handle of an Explorer Band

georgekjolly8-Mar-07 1:05

georgekjolly

8-Mar-07 1:05

Hai Prasad ,

Thank you very much for ur reply . it helped me to rectify my problem.

Thanks
George

Re: Getting Window Handle of an Explorer Band

prasad_som8-Mar-07 1:32

prasad_som

8-Mar-07 1:32

Welcome !

Prasad
Notifier using ATL | Operator new[],delete[][^]

Multiple COM for ms word (2003+2007)

mohadcs5-Mar-07 20:30

mohadcs

5-Mar-07 20:30

i used MS Word COM (e.g 2007) in my program to do some function
but when i run my program on a
(diffrent machine with adiffrent MS Office(2003))

then the program raise an error
any body can tell how can i generalise my program and run it over any machine has MS Office?????.... D'Oh! | :doh:

microsoft telephoni

matata_mn3-Mar-07 19:31

matata_mn

3-Mar-07 19:31

hi Im New In Tapi ,i want creat project that answer the Call and get the entry number
can U help???
Tanx

Mati

Re: microsoft telephoni

prasad_som3-Mar-07 20:41

prasad_som

3-Mar-07 20:41

Search on CP retrieves following results, see if its useful anyway.
TAPI[^].

Prasad
Notifier using ATL | Operator new[],delete[][^]

Image Map for destop (non-.net) application

bayo2-Mar-07 6:37

bayo

2-Mar-07 6:37

Hi,
I am working on an application that will require the creation of hot-spots on a windows form (win32). This is the scenario: I want to display a schematic diagram (like a circuit diagram) and high-light certain components as clickable hotspots. Clicking these components will result in events being generated which I can handle.
Please does anyone have ideas about how I can get about this?

acodeisacodeisacode

Getting a list of unread messages

a.olekhnovich2-Mar-07 5:33

unresolved external symbol _IID_IMAPIProp

2-Mar-07 5:33

How can I access to unread messages in the Inbox folder using C++ (COM/EMAPI).

<br />
void __stdcall CAddin::OnNewMail()<br />
{<br />
  // m_spApp - a global Application var<br />
}<br />

a.olekhnovich1-Mar-07 1:40

Re: unresolved external symbol _IID_IMAPIProp

1-Mar-07 1:40

Hi all,
I was using COM. But when I started to use EMAPI I got a link error:
error LNK2001: unresolved external symbol _IID_IMAPIProp in

<br />
IUnknown *pUnk;<br />
spMailItem->get_MAPIOBJECT(&pUnk);<br />
CComQIPtr < IMAPIProp, &IID_IMAPIProp > pMAPIProp(pUnk);<br />

In the link tab I have mapi32.lib.
So where can be a problem?

a.olekhnovich1-Mar-07 2:43

Add a Custom header in Outlook Add-in [modified]

1-Mar-07 2:43

Thanks to all, i've resolved the problem.

a.olekhnovich28-Feb-07 23:30

Re: Add a Custom header in Outlook Add-in

28-Feb-07 23:30

Hello,
I've to develop an MS Outlook Add-in, one of it's features has to add a custom header to an outgoing message (both SMTP & IMAP). I can intercept the message, so think I've a pointer to the CComQIPtr<outlook::_mailitem> spMailItem to add a header to.
For example, I need to add a header "X-MY-Header: Value".
All resolutions I've found was using .NET, I can't use that.
Any ideas?

Best Regards
Olekhnovich Alexander

-- modified at 6:48 Thursday 1st March, 2007

Roger Stoltz1-Mar-07 1:06

Roger Stoltz

1-Mar-07 1:06

a.olekhnovich wrote:
Any ideas?

Is this the only question you want to ask? Confused | :confused:

Hard to understand what your problem is...

Anyway, see if this[^] article will help you.

"It's supposed to be hard, otherwise anybody could do it!" - selfquote
"High speed never compensates for wrong direction!" - unknown

Re: Add a Custom header in Outlook Add-in

a.olekhnovich1-Mar-07 1:13

Re: Add a Custom header in Outlook Add-in

1-Mar-07 1:13

The problem is I can't understand what step-by-step I must do to resolve that task - to add a custom header to the outgoing email. I've an MailItem and can get the properties, so what's then?

a.olekhnovich1-Mar-07 1:24