You receive a "Library not registered" error message when you call a method in ATL server in Visual C++ 6.0 (221792)

RESOLUTION

Add the appropriate version number to the template arguments for IDispatchImpl and IProvideClassInfo2Impl, if you are deriving from this class. For example, to set the type library version number to 2.5, your class declaration might resemble the following.

class ATL_NO_VTABLE CMyControl : 
	public IDispatchImpl<IMyControl, &IID_IMyControl, &LIBID_MyControlLib, 2, 5>,
	public IProvideClassInfo2Impl<&CLSID_MyControl, NULL, &LIBID_MyControlLib, 2, 5>...
				

If your class derives from CStockPropImpl instead of IDispatchImpl, you need to set the type library version number via member variables, because CStockPropImpl derives from IDispatchImpl but it doesn't provide any template arguments for setting the version number. The major and minor version numbers are actually stored in CComTypeInfoHolder::m_wMajor and CComTypeInfoHolder::m_wMinor. IDispatchImpl contains a CComTypeInfoHolder member called _tih. You can set the version number in your class constructor.

	CMyControl()
	{
		_tih.m_wMajor = 2;
		_tih.m_wMinor = 5;
	}