Re: ImageList_GetImageInfo - alter the bitmap(s) ?

On 9/30/2024 3:11 PM, R.Wieser wrote:
> Hello all,
> 
> Using XPsp3.
> 
> I was playing with the idea to dynamically alter the contents of an
> ImageList, and found the
> https://learn.microsoft.com/en-us/windows/win32/api/commctrl/nf-commctrl-imagelist_getimageinfo
> function, which says :
> 
> "The information in this structure can be used to *directly* manipulate the
> bitmaps for the image"
> 
> (bolding mine).
> 
> I've been trying to think of how that is possible - the bitmaps cannot be
> selected into a memoryDC - and to google information about how that would
> work, but came up empty.
> 
> Question:
> Does anyone know what "directly manipulate the bitmaps" method MS is
> referring to in the above ?
> 
> Remark:
> I already thought of and written another way to do what I want, but would
> like to know how the above works.  Who knows, their (MS) method might be
> simpler. :-)
> 

   I've never used an ImageList, but the docs say GetImageInfo returns
an ImageInfo structure, which includes an hBitmap. With that you can
call things like GetDIBits, SetDIBits, etc.