ACE/examples/DLL/test_dll.cpp

   1 // This program tests out how the various objects can be loaded
   2 // dynamically and method calls made on them.
   3
   4 #include "Magazine.h"
   5 #include "ace/DLL.h"
   6 #include "ace/Log_Msg.h"
   7 #include <memory>
   8
   9 typedef Magazine* (*Magazine_Creator) ();
  10
  11 int
  12 ACE_TMAIN (int argc, ACE_TCHAR *argv[])
  13 {
  14   ACE_UNUSED_ARG (argc);
  15   ACE_UNUSED_ARG (argv);
  16
  17   ACE_DLL dll;
  18
  19   int retval = dll.open (ACE_DLL_PREFIX ACE_TEXT("DLL_Today"));
  20
  21   if (retval != 0)
  22     ACE_ERROR_RETURN ((LM_ERROR,
  23                        "%p",
  24                        "dll.open"),
  25                       -1);
  26   Magazine_Creator mc;
  27
  28   // Cast the void* to non-pointer type first - it's not legal to
  29   // cast a pointer-to-object directly to a pointer-to-function.
  30   void *void_ptr = dll.symbol (ACE_TEXT ("create_magazine"));
  31   ptrdiff_t tmp = reinterpret_cast<ptrdiff_t> (void_ptr);
  32   mc = reinterpret_cast<Magazine_Creator> (tmp);
  33
  34   if (mc == 0)
  35     {
  36       ACE_ERROR_RETURN ((LM_ERROR,
  37                          "%p",
  38                          "dll.symbol"),
  39                         -1);
  40     }
  41
  42   {
  43     std::unique_ptr<Magazine> magazine (mc ());
  44
  45     magazine->title ();
  46   }
  47
  48   dll.close ();
  49
  50   // The other library is now loaded on demand.
  51
  52   retval = dll.open (ACE_DLL_PREFIX ACE_TEXT ("DLL_Newsweek"));
  53
  54   if (retval != 0)
  55     {
  56       ACE_ERROR_RETURN ((LM_ERROR,
  57                          "%p",
  58                          "dll.open"),
  59                         -1);
  60     }
  61
  62   // Cast the void* to non-pointer type first - it's not legal to
  63   // cast a pointer-to-object directly to a pointer-to-function.
  64   void_ptr = dll.symbol (ACE_TEXT ("create_magazine"));
  65   tmp = reinterpret_cast<ptrdiff_t> (void_ptr);
  66   mc = reinterpret_cast<Magazine_Creator> (tmp);
  67
  68   if (mc == 0)
  69     {
  70       ACE_ERROR_RETURN ((LM_ERROR,
  71                          "%p",
  72                          "dll.symbol"),
  73                         -1);
  74     }
  75
  76   {
  77     std::unique_ptr<Magazine> magazine (mc ());
  78
  79     magazine->title ();
  80   }
  81
  82   dll.close ();
  83
  84   return 0;
  85 }
  86