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i am developing a small application for controlling a robot unit. In this program is use lua to run scripts which move the robot by calling the functions of the c program. This works fine but now i would like to implement a variable monitor, to display the value of e.g. the counter of a for-loop in the GUI of the c-program.

The easiest implemetation for me would be to pass another c-function to lua which can be added in the script to pass the value of the desired variable and update the view. But this is also the least elegant solution ;)

I read a bit into the lua-debug-facilities but i did not really understand if monitoring variables is possible with it.

The third thing is the variable lua_getglobal. Is it possible to call it periodically in the C-programm while the script is running? I read the function takes the variable from the stack so i guess it is only valid to call lua_getglobal when the skript has finished?

Thanks in advance for your help!
(and sorry for my bad english ;)