c++のdllを動的に呼び出す

            ，      ，        。
[
DllImport("Kernel32.dll")
]
public static extern int LoadLibrary(String funcname);

[
DllImport("Kernel32.dll")
]
public static extern int GetProcAddress(int handle, String funcname);

[
DllImport("Kernel32.dll")
]
public static extern int FreeLibrary(int handle);

//
//   :             (test)  ..
//
public delegate int Invoker(string ProjName, string SchemeName, string Mile, ref double ContnMile, ref bool Reliability, ref short LineKind);

static void Main(string[] args)
{
    int handle = LoadLibrary(@"test.dll"); //      ..
    
    if (handle != 0)
    {
        int address = GetProcAddress(handle, "test"); //      ..
        
        if (address != 0)
        {
            Invoker invoker = (Invoker)Marshal.GetDelegateForFunctionPointer(new IntPtr(address), typeof(Invoker));
            
            //use invoker -> demo: invoker(...);
            
            FreeLibrary(handle);
        }
    }
}