I am trying to modify Gothic 2 just fo fun. I am having the addresses of the classes, the constructors, deconstructors, but i need to know how to find out the size of a class(e.g. oCNpc).To find out the classes' address i am using IDA. The reason for this is that i want to create my own instances of that classes, but to do so i need to allocate some memory(size = sizeof(class)) mov the pointer to ECX then call the class' constructor. --xilup

Put a breakpoint on the constructor. When it gets hit, hopefully it is the result of a dynamic allocation (malloc/new). Look up the stack to find the call to malloc, and check the argument, which should tell you the number of bytes.

Quote:Original post by cache_hit
Put a breakpoint on the constructor. When it gets hit, hopefully it is the result of a dynamic allocation (malloc/new). Look up the stack to find the call to malloc, and check the argument, which should tell you the number of bytes.

Perfect!Thank you, it worked!