#include <windows.h>
 
extern "C" _declspec(dllexport) void showMessageBox()
{
  MessageBox( NULL, "Hello World!", "DllImport-Test", MB_OK );
}

Private Declare Auto Sub showMessageBox Lib "MyDll.dll" () 
 
'// oder:
 
<System.Runtime.InteropServices.DllImport("MyDll.dll", _
CallingConvention:=Runtime.InteropServices.CallingConvention.Cdecl, _
EntryPoint:="showMessageBox")> _
Private Declare Auto Sub showMessageBox Lib "MyDll.dll" ()