invoke method signature for a dll function returning a pointer

hi, this is ravi kiran.

i am using jawin to call third party dll files.

in the dll there is a method with the following signature

unsigned char* SF_GetImageBuffer();

when i am making a call to the above method in java(using jawin) it is
returning a unsigned char pointer.

can any one tell me the signature of the "invoke"  method in jawin so as
to get the content of the returned pointer.

plz help me.

thanx in advance.