From: di vi <infibit@...>
Date: 2010-02-11T00:10:20+09:00
Subject: Using Ruby /DL to invoke function in windows dll

Hi,

I have a C++ code converted into a windows Dll.I want to use Ruby /DL to
invoke the functions in the DLL.

Here are the function prototypes:
C++ code
[code]
// MathFuncsDll.h

namespace MathFuncs
{
    class MyMathFuncs
    {
    public:
        // Returns a + b
        static __declspec(dllexport) double Add(double a, double b);

        // Returns a - b
        static __declspec(dllexport) double Subtract(double a, double
b);

        // Returns a * b
        static __declspec(dllexport) double Multiply(double a, double
b);

        // Returns a / b
        // Throws DivideByZeroException if b is 0
        static __declspec(dllexport) double Divide(double a, double b);
    };
}
[/code]

Ruby code
[code]
require 'dl/import'
module MATHFUN
extend DL::Importable
dlload "math funcs.dll"
extern "double Add(double a, double b)"
#extern "int strlen(const char *)"
end
MATHFUN.Add(5,4)
[/code]

Gives me an error saying undefined symbol.
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