<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> <HTML> <HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"> <META NAME="Generator" CONTENT="MS Exchange Server version 6.5.7653.38"> <TITLE>Using the Foreign Language Interface.</TITLE> </HEAD> <BODY>  I'm having issues with the Foreign Language Libraries and using them to get at some C++ functions. Essentially my scheme program wants to pass a string to a C++ function that has this signature: double Value_Of_Expr(const string &Expr). I compiled the C++ progame into a DLL using g++ using this: g++ -shared -o fn.dll fn.cpp, but Im not sure if this is correct, it's just what some help website said to do, but I don't know if it is doing it correctly or not. I then try to load the created dll using schemes foreign language library functions: (ffi-lib fn.dll), but this crashes scheme and I have to manually shut down the program. I have tried loading the Value_of_Expr() function using (get-ffi-obj) but the documentation on the docs is lost on me, I can't follow it. Can anyone help me solve this issue? To state it hopefully a bit more clearly: I am trying to interact with a dll I compiled using g++ -shared -o fn.dll fn.cpp. I need to get at the double Value_Of_Expr(const string &Expr) function inside that file and pass it a string from scheme. I then need to retrieve a returned number from the function. I am unsure how to do any of this really >< ~Steve Z </BODY> </HTML>