Comport in a DLL

Hello,
We are trying to build a DLL with the Comport component.
It just doesn’t work :(
I get an « Access violation error » as soon as I set any of the Comport parameters.

I have built a very simple example for testing purpose and I get the exact same error.
Please see my code and help me to fix problem.

It looks like if the DLL behaves as if it had all the memory of the computer at disposal.
Environment is :  Windows 7, Delphi 7, Comport 3.1

program Project1;
uses
  ShareMem,
  Forms,
  testDLL in 'testDLL.pas' {Form1};
{$R *.res}
begin
  Application.Initialize;
  Application.CreateForm(TForm1, Form1);
  Application.Run;
end.

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Unit

unit testDLL;

interface

uses
  ShareMem,Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs;

type
  TShowPort = procedure;stdcall;
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
  private
    ShowPort: TShowPort;
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.FormCreate(Sender: TObject);
var
  DLLModule:THandle;
  s:string;
begin
  DLLModule := LoadLibrary('mydll.dll');
  @ShowPort := nil;
  @ShowPort := GetProcAddress(DLLModule, 'ShowPort');
  ShowPort;
end;

end.

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DLL

library mydll;

uses
  ShareMem,SysUtils,Dialogs,CPort,
  Classes;

  var
    ComPort1:Tcomport;
{$R *.res}

procedure ShowPort;stdcall;
begin
  ShowMessage('address COMMPORT:'+IntToStr(Integer(@ComPort1)));
  ShowMessage('adresse COMMPORT BAUDRATE:'+IntToStr(Integer(@ComPort1.BaudRate)));

 ComPort1.BaudRate:=br2400; // <== access violation is here
end;

exports ShowPort;


begin
end.

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