How can I check if an ActiveX control is
registered in the Windows Registry?


I read the following code in the VFUG April
98 Newsletter (http://www.vfug.org) but it does
not work all the times.

<...>
#DEFINE HKEY_CLASSES_ROOT -2147483648
DECLARE INTEGER RegOpenKey IN advapi32.DLL INTEGER, STRING @, INTEGER @

cActiveX_Control = 'Sheridan.ActiveTreeView.ActiveX'
lReturn = RegOpenKey( HKEY_CLASSES_ROOT, @cActiveX_Control, @hKey )

if lReturn = 0
? 'The ActiveX is registered'
else
? 'The ActiveX is not registered'
endif
<...>

Sometimes the Sheridan ActiveTreeView control is
registered with the KEY:
'Sheridan.ActiveTreeView.ActiveX'
and the above code works fine, however, sometimes
the KEY is something like:
'HKEY_CLASSES_ROOT\CLSID\{1C203F13-95AD-11D0-A84B-00A0247B735B}'
and in this later case the above code does not
work.


Does anybody know another mechanism to detect
is the ActiveX control is registered?


Thank you,
Hector Correa