Thread Subject: Passing data to a GUI

Hello-

I am working on a project that involves using the Matlab
Compiler (MCR) to compile a .m file (in this case a MATLAB
GUI source file) into a shared library (a .h file). Once I
have a header file, I then have access from C to the main
MATLAB GUI function.

The problem is, I have not figured out how to successfully
send data to the functions declared in the .h file. The
following declaration is one found in the .h file for the
GUI produced by the MCR,

extern LIB_mainlib_C_API bool MW_CALL_CONV mlfMain(int
nargout , mxArray** varargout, mxArray* varargin);

According to documentation, data must be passed using 'cell
arrays' but whenever I try to send data to A SEPARATE
FUNCTION in the GUI file, I get errors (e.g. "handles" is
undefined). I know it is possible to access any function in
the GUI .m file from the main (top) function, but I have not
been successful.

Any help would be appreciated.
Thanks