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The CComControl class derives by default from CWindowImpl, so the error...
About the windowless aspect, i think that by default CComControl window is windowless, so no reason to worry, i think 
If isn't windowless, then put this in the private parte of your class:
unsigned m_bWndLess:1;
, this variable is a member of a union declared in
CComControlBase, a base class of CComControl, so it's necessary to declare it in the current class, but i think you wouldn't need this ...
Cheers;
Joao Vaz
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Dear All,
ITypeInfo::GetFuncDesc() accepts function-index(between 0 to cFuncs-1). Why it's so is beyond me?
Can somebody let me know ASAP how I can determine this index using DISPID, given the fact that the method DISPIDs of the VB DLL I am using are not continuous ( I mean some methods might be deleted by DLL authors after creating them)
This fact prevents me from using this :
index = (func's DISPID) - (DISPID of 1st DLL method) - 7
Context : VC++/ATL 6.0, IDispatch
Thanx in advance. 
Rohit Arora
rohita@dsrsolutions.com
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I don't understand, for instante to do the opposite, the normal order of the operations is
- invoke ITypeInfo::GetTypeAttr to retrieve an TYPEATTR structure
- then TYPEATTR::cFuncs is the number of methods the interface supports, so passing an number(index) between 0 and cFuncs - 1 to ITypeInfo::GetFuncDesc retrieves the appropriate function description.
- and FUNCDESC::memid is the DISPID of the method.
What are you trying to achieve ?
Joao Vaz
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Hi Joao,
Thanx for showing interest in my question.
I'm sorry if I haven't made my point clear and it confused you.
Anyway, here is the synopsis of a function I tried to write.
The function got a PROGID, and name of one its Methods. The said function has to invoke given method. It carries on this way :
-> Get DISPID of the method using IDispatch::GetIDsOfNames().
-> Somehow Get Method-index using its DISPID. (Q. How to do this?)
-> Get FUNCDESC using ITypeInfo::GetFuncDesc().
Presently I'm doing the "SECOND STEP" by passing all values between
0 to ITypeInfo::cFuncs-1 to ITypeInfo::GetFuncDesc(). Now check FUNCDESC::memid against method DISPID. This way get FUNCDESC of desired method. Works fine but what if PROGID has 500+ methods?? 
Can you suggest me a better way for this.
Hope to get the answer soon.
Rohit Arora
rohita@dsrsolutions.com
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Rohit wrote:
The function got a PROGID, and name of one its Methods. The said function has to invoke given method. It carries on this way :
-> Get DISPID of the method using IDispatch::GetIDsOfNames().
What ? 
After using IDispatch::GetIDsOfNames to retrieve the DISPID of the method, the normal thing is to Invoke the method passing the resulting dispid to the IDispatch::Invoke(...), to call the method, of course passing all the information required to method, like DISPPARAMS structure with the arguments needed by the method.
ITypeInfo::GetFuncDesc normally is used to for instance to produce a type library viewer, with generaly a tree view to load all the methods of a particular interface of a particular coclass, like the OLE/COM viewer util that ships with VC++.
Hope this helps,
Joao Vaz
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I wonder how I can use an ActiveX control in IE. I develop an ActiveX control... like a clock for example and I want the user to install the control... it displays a Yes/No license agreement... it installs the control and then it executes the control.
Like it works for Quicktime plugins...
Any tips ?
Jean-Marc Molina
Email: jmmolina@ifrance.com
Web: http://goa.ifrance.com
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Use OBJECT tag in your HTML
Mazy
"So,so you think you can tell,
Heaven from Hell,
Blue skies from pain,...
How I wish,how I wish you were here."
Wish You Were Here-Pink Floyd-1975
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what can i do to let all my clients to share the same data on the server.
every time i start a new client, a new server instance is created.
i 'm looking up to your answer.
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Declare your server as a singleton can be the solution for you like this:
DECLARE_CLASSFACTORY_SINGLETON(CYourClassObject)
Declare it before your COM_MAP(...). I assume you are using ATL
For advanced concept, change the way you register your com object.
Change the multiple instance in: _Module.RegisterClassObjects call to single instance
Good luck
"Dirty hands lead to important discovery..." - Thomas Edisson
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Hi newbe
A solution could be:
Register your com-server as a windows nt service.
Use a special account to start the com-server.
Take 'dcomcnfg.exe' to modify the rights.
... share the same data ... means, you have to make your code thread-safe.
PS: I have an german instruction for (D)COM newbies, I you want to, you can download it from: (job)
http://mypage.bluewin.ch/a-z/kurt.muellner/
cheers
Kurt Muellner
Fast Prototyping
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I can use dll's resource file to store the typelib and registe it. But If I want put the typelib to a EXE module. What should I do?
BTW, I compile a typelib into a EXE and write a regster item. But VB cann't Load it.
Thanks
Rainfall
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hello,
I've written vb dll and i want to call it from another vc app.
How do i do that?
Can someone pls explain me the steps involved and give me code example?
bless u all
tnx
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Also try http://www.codeproject.com/dll/vbactivexwithvc.asp.
#define MOSTLY_LEAN_AND_MEAN
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Hello everybody,
I have created a class to implment an Interface. But one i try to create an object by :
CComObject<client> * pclient;
CComObject<client>::CreateInstance(&pclient);
i get the error that the class CComObject is abstract and that i can't make an instance of it.
i 've used all the macros right:
BEGIN_COM_MAP(client)
COM_INTERFACE_ENTRY(iCLIENT)
END_COM_MAP()
i did also the object_map
so please help
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You need to use templates.
CComObject<myobject>* pMyObj;
CComObject<myobject>::CreateInstance(&pMyObj);
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hi,
Does COM use SendMessage(...) internally,atleast in Windows environment?If not what is the modus operandi?
Cheers.
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Yes, when you have components that live in the Single Threaded apartment, STA, COM creates a message pump for each new thread in order to synchronize the data between other threads when they call the STA component.
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Just off the top of my head, you should be able to use the get_parent, get_child and get_sibling methods to navigate around the DOM.
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Hi,
thanks for your suggestion. Can I use the IHTMLElement::get_sourceIndex, which hands me a long index, to uniquely identify an element? I can then come back to the same element using the index after calling IHTMLDOcument2::get_all() and navigating the resultant IHTMLElementCollection? Is a source index guranteed to be unique? Then I can bypass any complex notation and this would make things very simple. Have you ever used this or something similar?
Thanks.
#define MOSTLY_LEAN_AND_MEAN
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Hi,
I want to pass a metafile to an ATL server, so I encapsulated it on a PictureBox object, and then saved it on one IStream, then I try to recover it in the ATL object, and it gives me on error, the code that I use is:
MFC client:
if(IPict) {
IStorage *pIStg;
Res = ::StgCreateDocfile(NULL, STGM_READWRITE | STGM_SHARE_EXCLUSIVE | STGM_CREATE, 0, &pIStg);
if(pIStg) {
IStream *TempStream = NULL;
Res = pIStg->CreateStream(OLESTR("MyPicture"), STGM_READWRITE | STGM_SHARE_EXCLUSIVE | STGM_CREATE, 0,0, &TempStream);
HRESULT HRes = IPict->SaveAsFile(TempStream, TRUE, 0);
m_GDIGr.SetMetafile(TempStream);
}
}
ATL Server:
IPicture *Pict = NULL;
HRESULT Res = ::OleLoadPicture(pStream, 0, FALSE, IID_IPicture,(void **) &Pict);
What I had made wrong ?, Thanks in advance, Bye !
Braulio
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Hi Braulio
you say an error, what kind of error? An exception, a wrong hres or what.
PS: You have to resolve ANY HRESULT as a MFC-Client.
cheers
Kurt Muellner
Fast Prototyping
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Has anybody successfully converted a COM object to SOAP using the WSDL wizard (part of v2.0 SOAP SDK)?.
Basically you have a working COM Server and client, you Convert the COM server to a web service using WSDL generator. if you write a SOAP client to use you new web service you should be able to communicate with the server.
Sounds simple, but it hasn't worked for me, my probkem is getting the result from the return parameter!
Cheers
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How do I catch connection points events in com objects, I can catch them in MFC apps but I am failing so far to catch them in my dlls.
Any help would be good.
Cheers
Andy
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