File : gnatcom-initialize.adb


------------------------------------------------------------------------------
--                                                                          --
--      GNATCOM - Ada 95 COM/DCOM/COM+ Development Framework and Tools      --
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------------------------------------------------------------------------------

with Interfaces.C;
with System;

with GNATCOM.Types;

package body GNATCOM.Initialize is

   use type GNATCOM.Types.HRESULT;

   function CoInitialize
     (pvReserved : Types.Pointer_To_Void := System.Null_Address)
     return GNATCOM.Types.HRESULT;
   pragma Import (StdCall, CoInitialize, "CoInitialize");

   COINIT_MULTITHREADED : constant := 0;

   function CoInitializeEx
     (pvReserved : Types.Pointer_To_Void := System.Null_Address;
      dwCoInit   : Interfaces.C.unsigned_long := COINIT_MULTITHREADED)
     return GNATCOM.Types.HRESULT;
   pragma Import (StdCall, CoInitializeEx, "CoInitializeEx");

   procedure CoUninitialize;
   pragma Import (StdCall, CoUninitialize, "CoUninitialize");

   RPC_E_CHANGED_MODE : constant := 16#80010106#;
   --  Attempt to re-initilalize in wrong mode

   procedure InterlockedIncrement
     (lpAddend : access Interfaces.C.long);
   pragma Import (StdCall, InterlockedIncrement, "InterlockedIncrement");

   procedure InterlockedDecrement
     (lpAddend : access Interfaces.C.long);
   pragma Import (StdCall, InterlockedDecrement, "InterlockedDecrement");

   --------------------
   -- Initialize_COM --
   --------------------

   procedure Initialize_COM is
   begin
      if CoInitialize = RPC_E_CHANGED_MODE then
         raise CHANGED_MODE_ERROR;
      end if;
      InterlockedIncrement (Initialize_Count'Access);
   end Initialize_COM;

   -----------------------------------
   -- Initialize_COM_Multi_Threaded --
   -----------------------------------

   procedure Initialize_COM_Multi_Threaded is
   begin
      if CoInitializeEx = RPC_E_CHANGED_MODE then
         raise CHANGED_MODE_ERROR;
      end if;
      InterlockedIncrement (Initialize_Count'Access);
   end Initialize_COM_Multi_Threaded;

   ----------------------
   -- Uninitialize_COM --
   ----------------------

   procedure Uninitialize_COM is
   begin
      CoUninitialize;
      InterlockedDecrement (Initialize_Count'Access);
   end Uninitialize_COM;

end GNATCOM.Initialize;