Chandni appears to belong to the same family of font as Richa and
Krishna. So the converter for Richa/ Krishna should work for Chandni
as well.
Unicode to Richa font converter is already available at:
http://groups.google.com/group/technical-hindi/files
Richa to Unicode converter is under development. Its trial version is
ready, but at present only the basic characters of Richa are included
in it.
If the Chandni font converter is urgently required, please contact me
on my personal email ID. Please also send the sample text in Chandni
font for testing the converter.
---Narayan Prasad