貼出此文之前，未查閱過任何相似文章，如有相同，敬請見諒，并告示(注:本人曾就同一DLL中一窗體調用附窗體，如何實現之問題，請教過一前輩，但前輩笑笑未言)，此為我在寫動態元件時想到的一方法，結果通過,各位見諒。我為初學，而求學路見艱難，貼出只望對象我一樣初學者給點幫助，無他。
library DLLPJ;

uses
  SysUtils,
  Classes,
  Unit1 in 'Unit1.pas' {Form1},
  Unit2 in 'Unit2.pas' {Form2};

{$R *.res}

exports
  ShowMainPRGWin;
 
begin
end.
----------
unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Unit2,Dialogs, StdCtrls;
  //1.附窗體單元加在此處
type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  Form2: TForm2; //2.附窗體定義在此處
// Declare the export function of windows of the main DLL
function ShowMainPRGWin(AHandle:THandle):BOOL;StdCall;

implementation

{$R *.dfm}
function ShowMainPRGWin(AHandle:THandle):BOOL;
begin
  Form1:=TForm1.Create(application);
  Form2:=TForm2.Create(Application); //3.創建附窗體
  try
    Form1.ShowModal;
    Result:=False;
  Finally
    Form1.Free;
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  Form2.ShowModal;//4.在主窗體上調用附窗體
end;

end.
------------
unit Unit2;

interface

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

type
  TForm2 = class(TForm)
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form2: TForm2;

implementation

{$R *.dfm}

end.
----------
//在其他窗體上調用DLL的定義及方法
procedure ShowMainPRGWin(AHandle:THandle);StdCall External 'DLLPJ.DLL';

ShowMainPRGWin(1);