Hello,

In a managed application (c#) , I load an unmanaged dll (c++), but
during the execution I need to re-init the dll many times, so I tried to
free
the unmanaged dll and reload it after, it seems to work only one time ,
has anyone an explication about potential side effects? let see the c# code

class MyDllWrapper {

[DllImport ("kernel32.dll")]
private extern static IntPtr LoadLibrary(string fileName);
[DllImport ("kernel32.dll")]
private extern static bool FreeLibrary(IntPtr lib);
[DllImport("kernel32.dll")]
private extern static IntPtr GetModuleHandle(string moduleName);
[DllImport("myunmanagedlib.dll")]
private extern static void TestUnManagedDll();

private IntPtr lib = IntPtr.Zero;

public Test()
{
LoadMyUnmanagedDll();
TestUnManagedDll();  // ---------> OK
UnloadMyUnmanagedDll();

LoadMyUnmanagedDll();
TestUnManagedDll(); // ---------> OK
UnloadMyUnmanagedDll();

LoadMyUnmanagedDll();
TestUnManagedDll(); // ---------> CRASH
UnloadMyUnmanagedDll();
}

protected void LoadMyUnmanagedDll()
{
     lib = LoadLibrary("myunmanagedlib.dll");
}

protected void UnloadMyUnmanagedDll()
{
   if(lib == IntPtr.Zero) return;
   while (lib != IntPtr.Zero)
  {
   FreeLibrary(lib);
   lib = GetModuleHandle("myunmanagedlib");
  }
   lib = IntPtr.Zero;
}

}

thanks
antoine