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Creating ActiveX reference with the CLSID

Posted on 2001-07-13
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Last Modified: 2012-05-04
How can I get the app name and class name from the CLSID?  I want to do a CreateObject() but I don't know the application name and class of the object to create.  I only know the CLSID.  Thanks.
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Question by:dfc106
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Expert Comment

by:jrspano
ID: 6281554
search the registry it should tell you.  hkey classes root and then look under appid they should be in there
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Author Comment

by:dfc106
ID: 6281576
I need to do this programmatically.  Searching the registry would be too slow.
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Expert Comment

by:jrspano
ID: 6281589
it is near instantaneous on a pentium 166.  that is a pretty slow cpu.  If you know the clsid in advance why don't you just find it in your registry and then code it in your project. where are you getting the clsid from?

as for programmatically I don't think that is possible.  the only place i know of on a cpu that that info is stored is the registry.
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Author Comment

by:dfc106
ID: 6281625
I don't know the clsid in advance.  I'm hoping there is some function to dig the value out of the registry for me.  I could write the function to do it, but I'm lazy, and it probably wouldn't be as efficient as it could be.
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Expert Comment

by:jrspano
ID: 6281631
if you don't know the clsid or the name of the component how do you know what to load at all??
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Author Comment

by:dfc106
ID: 6281661
I'm getting the clsid out of a database at runtime.  As far as searching the registry; try taking the clsid of the last entry in your hkey_classes_root key then search for it.  Way too slow.  I either need a function that can quickly locate it, or I need to know how I can search for it myself efficiently.
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Expert Comment

by:jrspano
ID: 6281692
is it your db?  if so modify it to include the componet names.  there isn't a way to just return the component name from the class id.  you are stuck with searching the registry.  If you use the registry api's it is fast.  you already know the location of the ids hkeyclassesroot/appid.
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Expert Comment

by:KDivad
ID: 6282524
A quick look at my registry tells me that you can open the default value at either:

HKCR\CLSID\ & ClassIDFromDB
-or-
HKCR\CLSID\ & ClassIDFromDB & "\ProgID"

and that will be the name of what you can pass to CreateObject.

This gets me the name of my own components and several that aren't my own. A bit of practice should tell you which is more reliable...
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Author Comment

by:dfc106
ID: 6282750
Thanks guys but here is the answer I was looking for:

Private Declare Function ProgIDFromCLSID _
   Lib "ole32.dll" (pCLSID As GUID, lpszProgID As Long) As Long

There is a good example at:
http://support.microsoft.com/support/kb/articles/Q183/5/44.ASP
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Expert Comment

by:jrspano
ID: 6285521
cool you learn something every day!
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Expert Comment

by:DanRollins
ID: 7153419
Hi dfc106,
It appears that you have forgotten this question. I will ask Community Support to close it unless you finalize it within 7 days. I will ask a Community Support Moderator to:

    Refund points and save as a 0-pt PAQ.

dfc106, Please DO NOT accept this comment as an answer.
EXPERTS: Post a comment if you are certain that an expert deserves credit.  Explain why.
==========
DanRollins -- EE database cleanup volunteer
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