Acessing ActiveX Component Interfaces/ Library not registered - COM Discussion Boards

Create GUID from string

Kri58-Jun-05 4:17

Kri5

8-Jun-05 4:17

Is there a function that creates a GUID froma string, similar to what StringFromGUID2 does but the other way round?

Re: Create GUID from string

Anonymous9-Jun-05 1:00

Anonymous

9-Jun-05 1:00

You can use

RPC_STATUS RPC_ENTRY UuidFromString(<br />
  unsigned char* StringUuid,<br />
  UUID* Uuid<br />
);

taken from Platform SDK Help.

Get Control ID from ActiveX button

MailtoGops6-Jun-05 5:52

MailtoGops

6-Jun-05 5:52

Hi,

We have a MFC/VC++ application. We are using a active x button control in our application. I want to get control ID/Window ID(not handle) from the activeX control. How it is possible?.

Thanks & Regards,

Gopalakrishnan

" Action without vision is only passing time,
Vision without action is merely day dreaming,
But vision with action can change the world "

- Words from Nelson Mandela

Thanks & Regards,

Gopalakrishnan

Re: Get Control ID from ActiveX button

Veera Raghavendra17-Jun-05 19:08

Veera Raghavendra

17-Jun-05 19:08

with GetDlgCtrlId() we can get the button id.

e.veera raghavendra

Re: Get Control ID from ActiveX button

MailtoGops22-Aug-05 0:25

MailtoGops

22-Aug-05 0:25

But you cannot get a control id from a active x button control

" Action without vision is only passing time,
Vision without action is merely day dreaming,
But vision with action can change the world "

- Words from Nelson Mandela

Thanks & Regards,

Gopalakrishnan

Distributed Transaction Error

janlala5-Jun-05 0:10

janlala

5-Jun-05 0:10

Hi all,

I'm working with a VB 6 app that uses COM componensts utilizing COM+ services on a Windows 2000 Professional machine. These components access and manipulate SQL Server 2000 data. Recently, I've modified a module in the client application just to get an error message in the COM+ component that reads:
"Distributed transaction completed. Either enlist this session in a new transaction or the NULL transaction."

I've searched Microsoft.com for this error and found info at this URL:
http://support.microsoft.com/default.aspx?scid=kb;en-us;834849

But the scenario described in the document doesn't match mine. Apparently all code is okay and TransactionMode property of each participating component is perfectly set (to RequiresNewTransaction for root object of the transaction and to UsesTransactions for others) but the error still occurs. An important thing to note is that the error doesn't occur while adding a record. It occurs only when a record is edited and then saved. Even though the same code base is used to perform both the operations.

Please help me solve this issue. Any help or ideas are greatly appreciated.

Regards,

IDispacth, ADORecordset and properties loss?!?

almc3-Jun-05 0:53

almc

3-Jun-05 0:53

Hi there!

I have a activex dll written in vc++ 6.0
There is one function that needs to receive a Ado Recordset from a VBasic application. It seems that after the VB does the call to the function, the ADORecordset loses at least one property: Sort.

The function is receiving the ADORecordset as an IDispatch.
Any ideia is a good idea to this problem...

Thanks in advance.

António Carvalho

Acessing ActiveX Component Interfaces/ Library not registered

Florian Storck1-Jun-05 23:13

Florian Storck

1-Jun-05 23:13

Hi there,

I've some problems accessing my ActiveX control from a VBScript/JScript. The control can be successfully initialized and acessed via the <object> tag.
The problem is, that I've to retrieve additional objects/interfaces from the control, which are all defined in the typelib embedded in the control. This looks somehow like this:

var ObjInst = new Object;

    // returns another IDispatch interface of an internal object
    ObjInst = Control.GetInstance();

    // creates a "Library not registered" error
    ObjInst.Method();

Because everythings working fine from CPP/VB when compiling, I would like to know, whether I have to register or reference the typelib somehow in the html code or somewhere else, or whatever may cause this error. I can view the typelib in the OLE viewer supplied with visual studio, so the registration can't be that faulty in my opinion. My thoughts were, that acessing a reference to a IDispatch interface should be generally no problem in JScript/VBScript.

Thanks for any suggestions.

Florian

Re: Acessing ActiveX Component Interfaces/ Library not registered

lemur21-Jun-05 23:25

lemur2

1-Jun-05 23:25

Hi Florian,

It may not be related, but at work yesterday, I was having a similar problem when trying to use a legacy C++ OCX from a script.

What I found was that the control was written with MFC and was specifically blocking access to the dispatch interface.

I was able to override the IsInvokeAllowed() to return TRUE which solved my problem.

As I said, it may be completely unrelated, but its worth looking into if your control was written using MFC.

Regards

Kev

Re: Acessing ActiveX Component Interfaces/ Library not registered

Florian Storck1-Jun-05 23:34

Florian Storck

1-Jun-05 23:34

Hi Kev,

thanks for your fast reply! Well, the control is originally based on MFC, so I think this is worth a try.

Bye, Florian

Re: Acessing ActiveX Component Interfaces/ Library not registered

Florian Storck2-Jun-05 0:12

Florian Storck

2-Jun-05 0:12

Hi kev,

bad news so far. Overriding doesn't helps here. The function gets called, but generally returning TRUE hasn't had any effect. I changed it for crosschecking to FALSE and got a different error, when trying to invoke the function which returns the IDispatch reference to the internal object I want to expose.

But in general I'm right, when I suppose that JScript/VBScript should automatically generate a wrapper for a returned reference to an IDispatch interface ( IDispatch* in the used function) ? Or have I anything forgotten in that case ? My exposed Control doesn't implements these additional interfaces, but they're all defined and accessible in the corresponding typelibrary.

Bye,
Florian

Re: Acessing ActiveX Component Interfaces/ Library not registered

lemur22-Jun-05 21:58

lemur2

2-Jun-05 21:58

Hi Florian,

I'm not too sure if I'm fully understanding your problem - it looked at first glance as if it was the same problem as mine.

To anyone else reading, if I put my foot in it, please correct me - in no way do I claim to be a COM wizard. Just been around the block a couple of times, learning as I go... Dead | X|

Basically, if you access a COM component or control using a scripting language, you're limited to whatever functionality is available on the default interface of the component which must be an IDispatch-based interface. Calls are made simply by the scripting host mapping the method or property name (string) onto an id (int) and passing this id along with parameter information to the IDispatch::Invoke method.

If your control implements only custom (IUnknown-based) interfaces, you won't be able to access its functionality from a scripting language.

If an MFC wizard was used, you'll almost certainly have at least part of your component exposed via a dual interface. If you've added any further secondary interfaces though, these won't be accessible to the scripting language.

Can you give me a bit more detail about your component - maybe attach an IDL file or even the coclass definition from the IDL file?

Kev

Re: Acessing ActiveX Component Interfaces/ Library not registered

Florian Storck2-Jun-05 23:34

Florian Storck

2-Jun-05 23:34

Hi Kev,

well, I suppose you're getting to the core there. All interfaces are implemented as dual, automation. It was a former MFC Control, which has been added ATL support. The control itself exposes their standard dispatch interfaces.

The basic definition is somehow like this:

  [ object, 
  uuid(), 
  version(1.0),
  dual,
  oleautomation, 
  pointer_default(unique)
]
interface IMyIF: IDispatch
{

   [id(0x00020001)] HRESULT fn1();
};

      [ uuid(),
	dispinterface _DCTL
	{
        properties:
       

		methods:                                                                     
	  
      [id(101),]  [unique] IMyIF* GetMyIF();
      [id(102), propget]   IMyIF* ActiveMyIF();
     
    };


	[ uuid(),     
          control 
    ]
	coclass CTL
	{
                [default] dispinterface _DCTL;
		[default, source] dispinterface _DCTLEvents;
	};

All objects to be exposed are maintained internally in the control, an the
coclass definition of IMyIF is noncreatable. So all I do is, returning the IDispatch reference pointer to an existing instance within the control via the GetMyIF() function or property. The funny thing is, that I downloaded the ActiveX control pad from Microsoft today, which shows me the methods implemented by IMyIF when clicking the propget method ActiveMyIF, but it's not working either.

I suppose, somehow only access to the direct implemented Dispatch methods of the control is possible. But I think there must be some way, to generate objects based on the other exposed IDispatch references. At least, IDispatch should be working, because it's runtime callable. Weird,weird.

Thanks again for your suggestions,
Florian

Re: Acessing ActiveX Component Interfaces/ Library not registered

Jörgen Sigvardsson17-Jun-05 22:06

Jörgen Sigvardsson

17-Jun-05 22:06

JScript and also VBScript behaves really weird if you miss to tag out parameters properly in the IDL definition. Make sure they are [out, retval].

An eye for a tooth will only make you see weird things.

Re: Acessing ActiveX Component Interfaces/ Library not registered

Florian Storck19-Jun-05 21:03

Florian Storck

19-Jun-05 21:03

Hi Jörgen,

well, that 's maybe worth a try. Thanks for your suggestion !

Bye,
Florian

Locking Display Of ActiveX Control

AntonioKeh31-May-05 14:47

AntonioKeh

31-May-05 14:47

Hi, first time posting a thread here and it is out of desperation.

I am creating an ActiveX control using VC++ and i am trying to disallow the resizing of the control during design time (using the control in VB).

I spent 1 full day to draw an icon on the control and I am not going to spend another day trying to do this.

Is there any easier way? I know when creating a control, you can actually specify things like OLEMISC_ONLYICONIC. Anyone have a solution to this? Am i doing it the wrong way? Is there a checkbox I can tick somewhere which can do this?

Please help...

AxShockwaveFlashObjects.AxShockwaveFlash Flashvars

davidhart31-May-05 3:59

davidhart

31-May-05 3:59

I am using the AxShockwaveFlashObjects.AxShockwaveFlash object on my C# winform. I have some swf files that require variables to be passed in using Flashvars. I can't use SetVariable because the swfs are not going to wait for me to set the variable. So, I would like to use the Flashvars property. However, it will not set. It doesn't complain if you try to set but it never takes. I have tried setting it during initialization but that does complain. Does anybody know how to set the Flashvars property? Please let me know.

David

How to write IE toolbar without ATL (on win32API)?

Anonymous30-May-05 9:53

Anonymous

30-May-05 9:53

Hello! Couldn't you please help me. I need to write IE toolbar on pure win32api and COM, but I'm not very experienced in this area: all toolbars that I've seen were written with use of ATL. What should I do for making IE toolbar without ATL? Thanks in advance.
Alexander.

Re: How to write IE toolbar without ATL (on win32API)?

Andy Moore6-Jun-05 8:03

Andy Moore

6-Jun-05 8:03

You can do this but you will have to do all of the heavy lifting yourself to replicate the work that ATL does for you. You will have to write all of the code that registers your component with COM, etc. I suggessting using Google to look for examples of skeleton code for creating COM components without ATL.

Human beings were not meant to sit in little cubicles staring at computer screens all day, filling out useless forms and listening to eight different bosses drone on about about mission statements. -- Peter Gibbons

"No such interface supported" returned from CoCreateInstance on successful IClassFactory->CreateInstance

T-Wilson28-May-05 4:26

T-Wilson

28-May-05 4:26

Hi,

I have an exe server and a client exe, the server starts up and does a CoRegisterClassObject for an IClassFactory implementation that provides "ComTestObject" instances.

The Client does " CoCreateInstance", while debugging the server I can see that the object requested ("IComTestObject") is created in the Class Factory and the pointer from the client is set. The IClassFactory returns S_OK

Now, I jump back to debugging the client, and CoCreateInstance returns 0x80004002 = "No such interface supported"

I really don't understand why this is being returned. When I clearly saw the server code create a new ComTestObject and return S_OK

What am I doing wrong, is there some common mistake here?

Here is the code for the Factory CreateInstance method, in the server:

/*--------------*/

STDMETHODIMP ComTestObjectFactory::CreateInstance(IUnknown *pUnkOuter, REFIID riid, void **ppv){

ComTestObject *p_obj;
HRESULT hr;

if (pUnkOuter)
return (CLASS_E_NOAGGREGATION);

if (IsEqualIID (riid, IID_IUnknown) ||
IsEqualIID (riid, IID_IComTestObject)) {

// Create New menu item object.
p_obj = new ComTestObject();
if (!p_obj)
return E_OUTOFMEMORY;
// See if object exports the proper interface.
hr = p_obj->QueryInterface (riid, ppv);
// This will cause an object delete unless interface found.
p_obj->Release ();
return hr;
}
return E_NOINTERFACE;

}

/*--------------*/

Here is the client code that asks for the object:

void makeObject(){

CoInitialize(NULL);

ComTestObject *p_obj;

HRESULT res=CoCreateInstance(CLSID_ComTestObject,NULL,
CLSCTX_LOCAL_SERVER,IID_IComTestObject,(void**)&p_obj);

}

Thanks for any help with this.

- Tom

MS Excel COM Interface description

rantotiaray27-May-05 4:06

rantotiaray

27-May-05 4:06

Hi,
Actually i am writing application automating MS Excel 2003.
I need a complete description of arguments type passed to the MS Excel COM interface.
For example CFont0::put_FontStyle(VARIANT NewValue)
How do i know the 'NewValue argument' type ?
I don't find on the web any website that explains that.

KXY

Variants

ursus zeta28-May-05 8:18

ursus zeta

28-May-05 8:18

Variants in COM can be almost anything (you probably know that, right?).
There are help files that describe the Office object type library hierarchy, written for Visual Basic programmers that are extremely well hidden on your computer. Try the OLE/COM Object viewer to locate them.
You don't say which language you are writing this application in, or, whether it's a .NET application or something else. This information is important in determining your approach to the problem.
If you are writing a .NET app, try using the TlbImp.exe utility included with the Framework SDK to convert the COM type library into a .NET assembly (this you can then examine with the IL Dissassembler to determibe types.

Re: MS Excel COM Interface description

Veera Raghavendra17-Jun-05 19:35

Veera Raghavendra

17-Jun-05 19:35

Let me know what u want to automate using Excel?

e.veera raghavendra

WMI and COM

macakd24-May-05 12:54

macakd

24-May-05 12:54

I've been battling around trying to implement WMI into my MFC application. I'm trying to get Windows XP informations such as product key, activation status, ect. I used COM init to interface with Win32_WindowsProductActivation class. I have problems with changing Windows XP Product Key. How can I run SetProductKey method with parameters??? I went through Microsoft docs but it's not clear to me at all. Any hits or sample code??? I've seen VB script but i have difficulty implementing it with C++.
Thank you all

Re: WMI and COM

Member 19404227-Jun-05 3:55

Member 1940422

7-Jun-05 3:55

problem in registering WMI Provider dll

I have 32bit WMI Provider dll,i can register(by regsvr32) this dll in .net installed system.but i could not register this dll without .net full installation(but i installed .net framework).Is there anyother configuration needed for registering this dll in without .net full installion

senthil

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