core/library/application/dll_root.cpp

   1 /*****************************************************************************\
   2 *                                                                             *
   3 *  Name   : DLL Main Root Support                                             *
   4 *  Author : Chris Koeritz                                                     *
   5 *                                                                             *
   6 *******************************************************************************
   7 * Copyright (c) 1995-$now By Author.  This program is free software; you can  *
   8 * redistribute it and/or modify it under the terms of the GNU General Public  *
   9 * License as published by the Free Software Foundation; either version 2 of   *
  10 * the License or (at your option) any later version.  This is online at:      *
  11 *     http://www.fsf.org/copyleft/gpl.html                                    *
  12 * Please send any updates to: fred@gruntose.com                               *
  13 \*****************************************************************************/
  14
  15 // Thanks to Andy Tan for some research into MFC extension dlls.
  16
  17 #include <application/base_application.h>
  18 #include <basis/utf_conversion.h>
  19 #include <structures/static_memory_gremlin.h>
  20
  21 //HOOPLE_STARTUP_CODE_DLL;
  22   // initialize objects needed by the hoople libs.
  23
  24 #ifdef _AFXDLL
  25
  26 #ifdef DEBUG
  27   #define TRACE_PRINTER(s) TRACE_PRINT(s)
  28 #else
  29   #define TRACE_PRINTER(s)
  30 #endif
  31
  32 // base for AFX dlls.
  33
  34 #include <afxext.h>  // MFC extensions.
  35 #include <afxdllx.h>  // Extension DLL declarations; include only once!
  36
  37 bool check_DLL_versions();
  38   // supplied by the library's version of dllmain.cpp.
  39
  40 static AFX_EXTENSION_MODULE SomeDLL = { NULL, NULL };
  41
  42 #ifndef DLL_NAME
  43   #define DLL_NAME "unnamed DLL"
  44 #endif
  45
  46 extern "C" int APIENTRY
  47 DllMain(application_instance instance, DWORD reason, LPVOID reserved)
  48 {
  49   SET_INSTANCE_HANDLE(instance);
  50   // Remove this if you use lpReserved.
  51   UNREFERENCED_PARAMETER(reserved);
  52
  53   char *dll_name = DLL_NAME;
  54     // mainly for debugging purposes.  having the value for DLL_NAME actually
  55     // stored should allow us to know which dll is being debugged.
  56
  57   static CDynLinkLibrary *dll_link = NIL;
  58
  59   static int dll_entry_count = 0;
  60
  61   switch (reason) {
  62     case DLL_PROCESS_ATTACH: {
  63       char *message = DLL_NAME " Initializing!\n";
  64       TRACE_PRINTER(message);
  65
  66       if (!check_DLL_versions()) return 0;
  67
  68       // Extension DLL one-time initialization
  69       if (!AfxInitExtensionModule(SomeDLL, instance)) return 0;
  70
  71       // Insert this DLL into the resource chain.
  72       dll_link = new CDynLinkLibrary(SomeDLL);
  73
  74       // NOTE: If this Extension DLL is being implicitly linked to by an MFC
  75       // Regular DLL (such as an ActiveX Control) instead of an MFC
  76       // application, then you will want to remove this line from DllMain and
  77       // put it in a separate function exported from this Extension DLL.  The
  78       // Regular DLL that uses this Extension DLL should then explicitly call
  79       // that function to initialize this Extension DLL.  Otherwise, the
  80       // CDynLinkLibrary object will not be attached to the Regular DLL's
  81       // resource chain, and serious problems will result.
  82       ++dll_entry_count;
  83       break;
  84     }
  85     case DLL_PROCESS_DETACH: {
  86       --dll_entry_count;
  87       char *message = DLL_NAME " Terminating!\n";
  88       TRACE_PRINTER(message);
  89       // clean up our other stuff.
  90       WHACK(dll_link);
  91       // Terminate the library before destructors are called.
  92       AfxTermExtensionModule(SomeDLL);
  93       break;
  94     }
  95     case DLL_THREAD_ATTACH:
  96         ++dll_entry_count;
  97         break;
  98     case DLL_THREAD_DETACH:
  99         --dll_entry_count;
 100         break;
 101     default:
 102 // do nothing.
 103       break;
 104   }
 105
 106   return 1;
 107 }
 108
 109 #elif defined(__WIN32__)
 110
 111 // regular dll base.
 112
 113 #include <application/windoze_helper.h>  // base windows stuff.
 114
 115 bool check_DLL_versions();
 116   // supplied by the library's version of dllmain.cpp.
 117
 118 BOOL APIENTRY DllMain(HANDLE module, DWORD ul_reason_for_call, LPVOID reserved)
 119 {
 120   SET_INSTANCE_HANDLE((application_instance)module);
 121   switch (ul_reason_for_call) {
 122     case DLL_PROCESS_ATTACH:
 123       if (!check_DLL_versions()) return 0;
 124       break;
 125
 126     // these are currently not processed.
 127     case DLL_THREAD_ATTACH:
 128     case DLL_THREAD_DETACH:
 129     case DLL_PROCESS_DETACH:
 130       break;
 131   }
 132   return true;
 133 }
 134
 135 #endif
 136