Failed to create object - activex control in VC++ 6.0

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Below Method is being executed two times, first time returning -2,147,467,262 for HRESULT value and second time zero, for single Object creation, and ultimately fails to create ActiveX control object.

C++

Value of HRESULT shows hresult = 

STDAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, LPVOID* ppv)
{
      HRESULT hres = _Module.GetClassObject(rclsid, riid, ppv);
      return hres;
}

What I have tried:

negative HRESULT value translates to 0x80004002 / E_NOINTERFACE error code with description "No such interface supported." as per MSDN.

Posted 11-Aug-17 1:46am

navneet@ISM

Updated 21-Aug-17 23:29pm

Nelek

v2

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Jochen Arndt 11-Aug-17 8:03am

What are the rclsid and riid values when calling that function?

Those tell you which COM interfaces (riid) are not present in the classes (rclsid).

Then check if the DLL containing the objects is present and registered.

navneet@ISM 14-Aug-17 7:10am

DllGetClassObject function gets executed two times, rclsid remains same in both execution. Additionally:
In first execution riid = IID_IClassFactory2, ppv = 0x005be5bc, hresult = -2147467262 ;
In second execution: riid = IID_IClassFactory, ppv = 0x005bf2ec, hresult = 0

Jochen Arndt 14-Aug-17 7:57am

So the DLL containing the objects does not support IID_IClassFactory2.
Do you really need that interface (it is only required when the object is license protected).

You have to ask the supplier of the DLL or check the documentation.

navneet@ISM 22-Aug-17 1:48am

Tried to add this ActiveX control to a Dialog of another basic mfc application using mouse right click and "Insert ActiveX control". It gives two errors on trot as:

1. The ActiveX control cannot be instantiated.
2. "Times Control" is not a valid ActiveX control. It is missing a required interface.

What appears confusing to me is on looking at all registered Automation objects, project which was compiling into a .dll file is present as an .OCX

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KarstenK · Answer 1 · 2017-08-12T08:06:00

Solution 1

So it is obvious that the object creation went wrong. This happens when the GUID isnt correct or the object isnt registered. Sometimes it happens when some (supporting) dll is missing which is needed for object creation.

Check that the correct object is adresssed by the call parameters. My tip is that it isnt registered. Register at the command line with regsvr32 in admin mode!!!

Posted 12-Aug-17 8:06am

KarstenK

Comments

navneet@ISM 14-Aug-17 3:00am

I tried registering the dll and ocx at the command line with regsvr32 in admin mode. but still giving me same error. I will look at GUID as suggested. Dll doesn't look like missing from project. Thank you for these clues, appreciate that.

navneet@ISM 21-Aug-17 8:00am

Tried to add this ActiveX control to a Dialog of another basic mfc application using mouse right click and "Insert ActiveX control". It gives two errors on trot as:

1. The ActiveX control cannot be instantiated.
2. "Times Control" is not a valid ActiveX control. It is missing a required interface.

navneet@ISM · Answer 2 · 2017-08-21T23:29:00

Solution 2

An ActiveX control that has persistent state, which was the case with this control, must implement either IPersistStream or IPersistStreamInit. Adding a line "COM_INTERFACE_ENTRY(IPersistStreamInit)", under

"BEGIN_COM_MAP(MyControl)-------- END_COM_MAP()"

solved the issue.

Posted 21-Aug-17 23:29pm

navneet@ISM