Crystal Reports thru C / C++ or JAVA

[Yogesh S Khanvilkar]

Hi,
I want to invoke the crystal report thru JAVA and also update the query of report ?
How do i do that ? I tried iNet crystal clear, but I couldn't find the way to modify the SQL query of the report.
Is there any other way to do it ?
Can i use crystal report's API using JAVA or C ? If yes then how ?
Please reply soon as this is very urgent.
Thanking you in advance
Yogesh