[Lazarus] ActiveX, TOLEControl

LacaK lacak at zoznam.sk
Tue Oct 18 15:52:57 CEST 2016

Hi *,

I need help with OCX component (not visual I guess), which I need use in 
Lazarus application (to control another application, which supplies this 
OCX control).
I have imported type library using importtl.exe (new unit was created 

Then in program I have created instance:
   v := CreateOleObject('SCAPS.ScSamlightClientCtrl');
   intf := CreateComObject(CLASS_ScSamlightClientCtrl) as 

But all next attampts using any interface method fail with EOleSysError 
"Catastrophic failure" (ErrorCode=-2147418113)

In Delphi it works, but only when I use TOLEControl descendant created 
by Delphi's import of ActiveX (into _TLB unit)
In Delphi I have :

TScSamlightClientCtrl = class(TOleControl)

but in Lazarus I have no equivalent? (When I Delphi I do same as in 
Lazarus I get same error also in Delphi)

I do not know exacly what to ask here ?
What is purpose of TOleControl and what TOleControl did more than I can 
do in Lazarus ?
Can I somehow workaround it in Lazarus ?

In short what I have imported from type lib in Lazarus is interface:
  _DSamlight_client_ctrl_ocx = dispinterface
    function ScIsRunning:Integer;dispid 1;
   ... etc.

and CoClass:
   Class Function CoScSamlightClientCtrl.Create: _DSamlight_client_ctrl_ocx;
     Result := CreateComObject(CLASS_ScSamlightClientCtrl) as 

I can create instance calling CoScSamlightClientCtrl.Create, but as I 
wrote I can not use any method ...

Can somebody give any help ?



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