COM Discussion Boards

Nilotpal19-Oct-01 0:26

19-Oct-01 0:26

I need to develop COM application using C++. Please help me with some complete code samples which I can execute. Also please give some reference to COM resources using C++ on Internet. Thanks in advance.
Nilotpal

Nilotpal

Re: Urgent Help on COM

Firoz19-Oct-01 4:22

Firoz

19-Oct-01 4:22

Hi,

There are some good samples of COM using C++ in MSDN.
Same you may get from MSDN online...

I think Inside-COM by Dale Rogerson is a good book...(in C++) for beginners.

Firoz

Re: Urgent Help on COM

Michael Dunn19-Oct-01 8:25

Michael Dunn

19-Oct-01 8:25

Are you working with COM for the first time? If so check out my COM tutorials (part 1 part 2) in the COM section here.

--Mike--
http://home.inreach.com/mdunn/
"....." -- Silent Bob
Heart | [heart]

your

with

and

exe service using com which uses ADO:)

18-Oct-01 22:04

hello,
i need a little help.
i have:
1) my ATL COM (lets say A) with MFC support which calls another my ATL COM (lets say B) with MFC which uses ADO(COM)

2) my ATL COM NT service(object C) created by wizard(server type=executable)

and what's my problem?
I can create instance of object A in object C, no problems, object A can create object B, still no problems, BUT there's no way for me to force the object B to pass the Open method of ADO's Connection, i'm still geting 0x80004005 - Unspecified error.

Is there anybody there who could help me, i would really appreaciate that.
thanks a lot in advance

johny flash

update

Johny Flash19-Oct-01 1:17

Johny Flash

19-Oct-01 1:17

definitely i'm not able to use even directly(without my objects descibed in the message above) ADO(COM) from executable service created with ATL COM AppWizard. Still can't open the connection, method Connection::Open Mad | :mad:

Re: exe service using com which uses ADO:)

Rashid Thadha20-Oct-01 12:56

Rashid Thadha

20-Oct-01 12:56

I have got ADO working in my NT Service without any problem.

Are you calling ::CoInitialize and CoUnitialize in all your threads. You need to load the OLe libraries in all your threads. ADO requires this as it is a COM Object.

Re: exe service using com which uses ADO:)

Johny Flash21-Oct-01 20:52

Johny Flash

21-Oct-01 20:52

it's working fine in a standard win32 console application, but not in a service EXE, i'm definitely sure that i'am calling both methods that you've mentioned Smile | :)

update #2

Johny Flash22-Oct-01 0:06

Johny Flash

22-Oct-01 0:06

#import "C:\Program Files\Common Files\System\ADO\msado15.dll" no_namespace rename("EOF", "EndOfFile")

void CServiceModule::Run()
{
//only relevant code
HRESULT hr = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED);

hr = _Module.RegisterClassObjects(CLSCTX_LOCAL_SERVER | CLSCTX_REMOTE_SERVER, REGCLS_MULTIPLEUSE);

try{
m_pConnection.CreateInstance(__uuidof(Connection));
m_pConnection->Open("Provider=MSDASQL;DSN=XXX","","",adConnectUnspecified);
}

catch(_com_error &e){
//catched with 0x80004005 all the time
}
}
Cry | :((

Accessing IWebBrowser2 w/ ATL object

IGx8918-Oct-01 16:06

IGx89

18-Oct-01 16:06

I created a toolbar for IE using the DeskBand ATL Object Wizard 2.0, and now I'm trying to access the IWebBrowser2 object. I specify this in the header:
CComQIPtr<iwebbrowser2, &iid_iwebbrowser2=""> m_spWebBrowser2;

and call these lines:
// Retrieve and store the IWebBrowser2 pointer
m_spWebBrowser2 = pUnkSite;
if (m_spWebBrowser2 == NULL)
return E_INVALIDARG;

But, for some reason unknown to me, m_spWebBrowser2 is always NULL! What am I doing wrong? I'm in the process of learning ATL/COM, so please excuse me if this is a newbie question Smile | :)

Re: Accessing IWebBrowser2 w/ ATL object

Michael Dunn18-Oct-01 19:43

Michael Dunn

18-Oct-01 19:43

Here's the code to do it.

CComQIPtr<IServiceProvider> sp =  punkSite;
CComPtr<IWebBrowser2> pbrowser;
 
    if ( sp )
        sp->QueryService ( IID_IWebBrowserApp, IID_IWebBrowser2, (void**) &pbrowser );

The site doesn't implement IWebBrowser2, but it knows how to get such an interface, so you ask it for that interface with IServiceProvider::QueryService().

--Mike--
http://home.inreach.com/mdunn/
"....." -- Silent Bob
Heart | [heart]

your

with

and

Re: Accessing IWebBrowser2 w/ ATL object

IGx8919-Oct-01 5:42

IGx89

19-Oct-01 5:42

Thank you! It did exactly what I wanted it to do Smile | :)

Adding a progress bar in ATL

scoob18-Oct-01 7:53

scoob

18-Oct-01 7:53

Hi!

I developped a MMC snapin that display an ATL object in the result pane (the one to the right).

The ATL object is a Composite Control. The control is showing ok but there is no functionnality except the buttons. I would like to add a progress bar but it doesnt work.

If anyone knows how to add the progress bar and make it functionnal. Or even better, if anyone knows how to use a CDialog (or anything CWnd based) based class behind that ATL object in the result pane. Help would be very appreciated!

Thanks
Scoob

Interfacing w/ IE, andIOleControl

IGx8917-Oct-01 15:49

IGx89

17-Oct-01 15:49

My goal: to be able to stop (and start, and stop again, etc...) left- and right-click events from going to Internet Explorer, AND to be able to send left- and right-click events to IE.

My situation: I've already made a toolbar for IE, and am trying to implement the above in this toolbar.

My efforts: I found the FreezeEvents method of IOleControl; would that work for part of what I want to do? If so, how do I implement it? I've gone crazy trying to figure out how to call the FreezeEvents function!

Also remember, I still need to know how to send those mouse click events to IE.

Help would be much appreciated!

Re: Interfacing w/ IE, andIOleControl

Erik Thompson18-Oct-01 8:29

Erik Thompson

18-Oct-01 8:29

Attache to the events of IE. You will get BeforeNavigate and such. then to simulate them youjust call Navigate2, Refresh, or Stop on the IWebBrowser2 interface. Also they have get_busy to tell if it is currently navigating/refreshing.

Cheers,
-Erik
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
My thoughts are my own and reflect on no other.

Re: Interfacing w/ IE, andIOleControl

IGx8918-Oct-01 12:56

IGx89

18-Oct-01 12:56

Uhhh, those things wouldn't help me a bit, I'm afraid Frown | :(

Re-read my message, and you'll see what I mean. Basically, I just need to disable all right- and left-mouse button clicks, within the web site pane of Internet Explorer (disabling it within all of IE would work, too).

Please help! I'll be able to make a killer helper for IE, if I can just get that figured out Wink | ;)

Re: Interfacing w/ IE, andIOleControl

IGx8919-Oct-01 5:43

IGx89

19-Oct-01 5:43

NM, I figured out how to do it! I just created a MouseProc hook, and returned -1.

ATL that importing DLL

mimi17-Oct-01 0:58

mimi

17-Oct-01 0:58

I writed dll via MFCAppWizard(dll) [extention dll] in vc++
and it's works excellent by client program in mfc. Smile | :)

----------------------------------------------------------
Now I need provide the dll for Delphi
So * I created ATL by ATL COM AppWizard (with support mfc)
* I added to it a ATL class (by the wizard , of course)
* I imported function from my mfc DLL as I did at the client program in mfc.

-----------------------------------------------------------
But It is not works !!!!
When I execute this ATL object by client program it does not perform the imported funcyion in run time. Frown | :(

----------------------------------------------------------
Who can help me ??????

Re: ATL that importing DLL

kumar_p317-Oct-01 16:55

kumar_p3

17-Oct-01 16:55

Did u use AFX_MANAGE_STATE() ?
And also u should not try to use the
classes from the MFC dll in the ATL program,
u can only use the functions.

If this does not help, further information
can help me anlayse it.

Thank you . more details. Please Help

mimi17-Oct-01 22:45

mimi

17-Oct-01 22:45

I must provide dll that will match to every language !!!
I did exctention dll that works well in vc but NOT in another.
I understood that the best way for me (as beginner at this subject) is to use the Wizard of ATL COM with suppot MFC and importe my mfc dll to it.
When I run it by client program (exe) the atl it works !
but the imported function (ShowDialog) dont performed. WHY ????????
------------------------------------------------------------
My steps:
1. I opened project: ATL COM Wizard. [DLL] [MFC Support]
2. I inserted to the library that created the file : MyMfcDll.dll
and attached to the ATL project the files : MyMfcDll.h , MyMfcDll.lib
3. I Added by wizard ATL class [MyClass] [single] [dual]
4. I added by wizard method [ShowMfcDialog] to IMyClass and fill it so :
___________________________________________

extern "C" __declspec(dllimport) void ShowDialog();

STDMETHODIMP CAtlObj::ShowMfcDialog()
{
AFX_MANAGE_STATE(AfxGetStaticModuleState())
AfxMessageBox(".....");
ShowDialog();
return S_OK;
}

Re: ATL that importing DLL

mimi17-Oct-01 23:52

mimi

17-Oct-01 23:52

I trys now to build ATL without import the MFC DLL that I crated.

So
1. I going to resources and inserting Dialog.
2. I created class dialog::CDialog (possibility ?)
3. I added ATL class - simple.
4. I added to this ATL class object from the class dialog .
5. I added to this ATL class method that doind : dlg.DoModal();

I run it from client program and it is works so :
It shows the dialog of the method of ATL class (in number 5)
But when press OK or Cancel it is crush.

____________________________________________________-
Have I use only in ATL dialog or there are a way to works as I tried (Maybe have I added AFX_MANAGE_STATE somewhere)?
What I need to add in the: () of that ?

Making things pretty by returning BSTR's (ATLCOM)

Tim Rymer16-Oct-01 10:00

Tim Rymer

16-Oct-01 10:00

We're making an ATL object to be used in ASP or Visual Basic.
I want to be able to return a BSTR to make it nice and pretty for my VB partner.

Ok ok, we all know that you can say...

///////////////
STDMETHODIMP Foo([out,retval] BSTR outstring)
///////////////

..and have it returned in a variable in the Implementation. (duh)
But can we get this a function in an object to look like:

///////////////
BSTR Foo(BSTR instring);
///////////////

or just something with the emphasis on returning a BSTR in the "real" return parameter place.

"The Master Wang" doesnt have money to buy a COM or ATL book...
and plus I know I'm asking questions from the best! Wink | ;)

SHABBA!!

*Please Contact Me if you have a Donation to give to a poor college student who needs money for a engagement ring for the greatest girl in the world. Big Grin | :-D

-~= The (still learning) Master Wang =~-

Re: Making things pretty by returning BSTR's (ATLCOM)

Not Active16-Oct-01 11:17

Not Active

16-Oct-01 11:17

If I understand what your asking

STDMETHODIMP Foo([out,retval] BSTR return_string, [out]BSTR out_string)

would get you

BSTR Foo(BSTR instring)

BTW, nice sucking up;)

Re: Making things pretty by returning BSTR's (ATLCOM)

Shadi Al-Kahwaji16-Oct-01 22:00

Shadi Al-Kahwaji

16-Oct-01 22:00

Hi,

Actually you can use any data type "Automation Data Types are recomended" to be a return type of any interface's method. But, it's just a recommendation that you use the HRESULT (STDMETHOD macro) as a return type, this return type will give the COM Runtime Environment the ability to return error codes when your component cannot be accessed for any reason. If you don't provide HRESULT as a return type, the COM Runtime Environment cannot return error codes for you.

"If You Know That Your Component Will Live With Its Client On The Same Machine, You Can Ignore HRESULT"

Regards,
ShadiK.

Re: Making things pretty by returning BSTR's (ATLCOM)

Michael P Butler16-Oct-01 22:36

Michael P Butler

16-Oct-01 22:36

>..and have it returned in a variable in the Implementation. (duh)
>But can we get this a function in an object to look like:

>///////////////
>BSTR Foo(BSTR instring);
>///////////////

No, COM interfaces can't return a value like you suggest.

The correct (and only way) is as you described,

STDMETHODIMP Foo([out,retval] BSTR* outstring)

Your VB code would then look like,

Dim sTemp

sTemp = Object.Foo

Hope this helps,

Michael Smile | :)

Re: Making things pretty by returning BSTR's (ATLCOM)

22-Oct-01 13:08

The solution is simple. In your source file (.cpp) change your function header to this:

STDMETHODIMP_(BSTR) YourClass::Foo(BSTR instring)

and do the same for your (.h) file.

You need to change the entry in the IDL file as well,like the following:

BSTR Foo(BSTR instring); Smile | :)

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