How to Debug .PLB and .FLL Source Code

SUMMARY

In order to step through the source code of a .PLB or .FLL file, you must compile the source code with the _BreakPoint() function. This macro generates the debugger breakpoint instruction Interrupt 3h. (NOTE: All interrupts are given in hexadecimal.)

Once this is done, you must start the debugger and execute FoxPro from within the debugger. After FoxPro has been started, it can be used normally, which means you must load the library and then call the functions from within the library that have the _BreakPoint() function. The library will execute normally until the _BreakPoint() function is reached. When this statement is reached, control will be transferred to the debugger. At this point, you will be able to step through the .C source code. When the code terminates, control will then be transferred back to FoxPro.