The error code is 'CO_E_NOTINITIALIZED'. You have to call 'CoInitialize( NULL);' before creating the control (if you're using MFC, the call is 'AfxOleInit();')
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Question
Ole and DLL
I am programming in VC++ 5 in NT. I've included a dialog in a regualr dll; and in the dialog there is an ole control. When I try to create an instance of the dialog I get the following error in the debug window:
CoCreateInstance of OLE control {53D4F583-DE5B-11D0-8B6C-4
>>> Result code: 0x800401f0
>>> Is the control is properly registered?
Warning: CreateDlgControls failed during dialog init.
Warning: Dialog creation failed!
The control is already registered in the system (I have used it in a normal application). What do I need to do to register on line (I suppose) the control for the dialog to work correctly??
;)
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Answers
BTW: This call is used to initialize athe OLE libraries, no function related to COM/OLE will work unless 'CoInitialize()' is called. The best place for this call is in the constructor of your dialog, and 'CoUninitialize()' should be placed i the dialogs destructor, hence. And: You could also use 'OleInitialize ( NULL);' ;-)
>>I believe that CoTaskMemAlloc and CoTaskMemFree will
>>work without the COM library having been initialized
Nope, they won't - the COM libraries' heaps are allocated when the DLLs are initialized.
BTW: 'OleInitialize()' & 'AfxOleInit()' are mainly wrappers around 'CoInitialize()' - the just perform a few other things (see the source of 'AfxOleInit()')
I am using MFC (initialized with AfxOleInit();) and now when I create an instance of the dialog the control registered correctly; But still the control does not seem to work. It seems that beeing inside the regular dll afects the ole control in a stange way, because I'vw used the same control in another non dll application and it works fine.
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by: NinPosted on 1999-03-31 at 11:28:58ID: 1422580
Edited text of question.