Nigel,
I tried to run your example, t1.cs, with MS Visual Studio 2008, and
encountered an error. Stripping the code off I detected that the error
happens in the destructor.
The final code is the following:
------------------------------------------------------------------------
using System;
using System.Runtime.InteropServices;
unsafe class GLPK
{ void* lp;
const string glpkLibrary = "glpk_4_34.dll";
[DllImport(glpkLibrary, SetLastError = true)]
static extern void* glp_create_prob();
public GLPK()
{
Console.WriteLine("Enter constructor");
lp = glp_create_prob();
Console.WriteLine("Exit constructor");
}
[DllImport(glpkLibrary, SetLastError = true)]
static extern void glp_delete_prob(void* lp);
~GLPK()
{
Console.WriteLine("Enter destructor");
glp_delete_prob(lp);
Console.WriteLine("Exit destructor");
}
}
class test
{
public static void Main()
{
Console.WriteLine("Enter Main");
GLPK lp = new GLPK();
Console.WriteLine("Exit Main");
}
}
------------------------------------------------------------------------
The output is the following:
Enter Main
Enter constructor
Exit constructor
Exit Main
Enter destructor
xfree: memory allocation error
Error detected in file ..\src\glplib07.c at line 147
Obviously there is something elementary wrong in the call to
glp_delete_prob, because removing the call causes the error to
disappear.
I am not a C# programmer. May be you could tell me what is wrong?
Thanks,
Andrew Makhorin
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