How to detect Annotations in a PDF programmatically?

I am looping through each object in a PDF (inside a C++ plugin) and then try to find out the color spaces in each element. (Related to this thread)
However, I am having problems with identifying the annotations in the page, if there are any. I can find out if there is text by using kPDEText enum value, kPDEImage for images, but there is no such thing for Annotations.
Any help?

I've a secondary question.
I was able to loop all the objects and get annotations. Now I get the color to a PDColoValue object without problem. My question is, in Adobe do they create annotations using only RGB color space? ie, do I only have to worry about that?

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But what if there is RGB data that means black or gray (R == G == B), does that mean black or RGB?
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From: Sachintha81 <[email protected]<mailto:[email protected]>>
Reply-To: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>>
Date: Wed, 8 Feb 2012 16:57:10 -0800
To: Leonard Rosenthol <[email protected]<mailto:[email protected]>>
Subject: How to detect color pages in a PDF?
Re: How to detect color pages in a PDF?
created by Sachintha81<http://forums.adobe.com/people/Sachintha81> in Acrobat SDK - View the full discussion<http://forums.adobe.com/message/4194889#4194889

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