how 2 recall data

i'm about to make a software about retaining wall for my project.and i'm using C++ to do the program,they say from C++ we can recall the data into Visual Basic. my problem is i don't know how to do it.and is the any tips how to do a program that can output result as drawing??

 

[BigH]

Try question in threads of Engineering Computer Programs. May get good help there as yours isn't a query about the analysis but one of computer.
Good luck - let us know if it turns out. Some of us may want to sneak a view!!