Article ID: 223152 - View products that this article applies to.
An MFC ActiveX control that subclasses any of the window classes implemented by Comctl32.dll causes the following error to be thrown from a Visual Basic 6.0 .exe.
The debug version of the ActiveX control causes an ASSERT in file Ctlcore.cpp, at the end of COleControl::CreateControlWindow, on or near line 662.
"System Error &H80004005 (-2147467259). Unspecified error"
This problem occurs only when you build an .exe from Visual Basic 6.0 and run it from outside the Visual Basic development environment.
Microsoft Visual Basic executables do not initialize the common control library (Comctl32.dll) by default, resulting in the CreateEx call failing in COleControl::CreateControlWindow. Calling GetLastError() gives 0x0000057F - Cannot find window class, which indicates the common control library needs to be explicitly initialized.
Inside the InitInstance of your ActiveX control, make a call to:
This ensures that Comctl32.dll is loaded and initialized, regardless of the container the control is running in.
Instead of calling InitCommonControls from the control's code, you can also call it directly from the Visual Basic client application:
Steps to Reproduce Behavior
Article ID: 223152 - Last Review: June 22, 2014 - Revision: 5.0