I found a FoxPro limitation related to Parameters statements when subclassing classes in visual class libraries (VCX). I had a parent class that has procedure with around 20 parameters in it. The total length of the Parameters statement was over 160 characters long. When I subclassed it can tried to modify that procedure and save it, I got this error repeatedly:

Buffer overrun detected!
Program...vfp8.exe
A buffer overrun has been detected which has corrupted the program's internal state. The program cannot continue execution and must now be terminated.

Then Foxpro crashed hard. I tried PACKing and compiling the class library. I rebuilt it from scratch and quite a few other things. The final solution was to reduce the length of the Parameters statement to below 160 characters.

I tested this same problem in classes created in a .PRG and did NOT have the same problem.

PS
I know 160 characters for a Parameters statement is a lot and should be avoided by good coding habits, but I happened to hit it this time and thought I'd share this undocumented limit with everyone else.

Matthew J. Price