How to define the interface to "const char *"

This is on Windows 7, CCL, latest CFFI pull. I am writing an interface to a function that has a const char * as in input: int DDC_GetFileStringPropertyLength (DDCFileHandle file, *const char *property*, unsigned int *length); In my defcfun, can I use *:string*, or do I need to do something special? The reason I ask is that calls to this function cause a memory exception on one of my computers, while it works fine on the second computer. Thanks, Mirko