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Расшаренная DLL



Автор: Xavier Pacheco

{
Copyright © 1999 by Delphi 5 Developer's Guide - Xavier Pacheco and Steve Teixeira
}

library ShareLib;

uses
  ShareMem,
  Windows,
  SysUtils,
  Classes;
const

  cMMFileName: PChar = 'SharedMapData';

{$I DLLDATA.INC}

var
  GlobalData: PGlobalDLLData;
  MapHandle: THandle;

  { GetDLLData will be the exported DLL function }

procedure GetDLLData(var AGlobalData: PGlobalDLLData); stdcall;
begin
  { Point AGlobalData to the same memory address referred to by GlobalData. }
  AGlobalData := GlobalData;
end;

procedure OpenSharedData;
var
  Size: Integer;
begin
  { Get the size of the data to be mapped. }
  Size := SizeOf(TGlobalDLLData);

  { Now get a memory-mapped file object. Note the first parameter passes
    the value $FFFFFFFF or DWord(-1) so that space is allocated from the system's
    paging file. This requires that a name for the memory-mapped
    object get passed as the last parameter. }

  MapHandle := CreateFileMapping(DWord(-1), nil, PAGE_READWRITE, 0, Size,
    cMMFileName);

  if MapHandle = 0 then
    RaiseLastWin32Error;
  { Now map the data to the calling process's address space and get a
    pointer to the beginning of this address }
  GlobalData := MapViewOfFile(MapHandle, FILE_MAP_ALL_ACCESS, 0, 0, Size);
  { Initialize this data }
  GlobalData^.S := 'ShareLib';
  GlobalData^.I := 1;
  if GlobalData = nil then
  begin
    CloseHandle(MapHandle);
    RaiseLastWin32Error;
  end;
end;

procedure CloseSharedData;
{ This procedure un-maps the memory-mapped file and releases the memory-mapped
  file handle }
begin
  UnmapViewOfFile(GlobalData);
  CloseHandle(MapHandle);
end;

procedure DLLEntryPoint(dwReason: DWord);
begin
  case dwReason of
    DLL_PROCESS_ATTACH: OpenSharedData;
    DLL_PROCESS_DETACH: CloseSharedData;
  end;
end;

exports
  GetDLLData;

begin
  { First, assign the procedure to the DLLProc variable }
  DllProc := @DLLEntryPoint;
  { Now invoke the procedure to reflect that the DLL is attaching
    to the process }
  DLLEntryPoint(DLL_PROCESS_ATTACH);
end.
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