插入窗体到别的程序里

Form1代码

unit Unit1;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

uses Unit2;

procedure TForm1.FormCreate(Sender: TObject);
var
  h: HWND;
  s : string;
begin
  h := 0;
//  s := 'USB cable serial number manager 1.00';
//  s := 'ir-750 Interface Program Ver1.02';
  s := 'PDF-XChange viewer';
  h := FindWindow(nil,PChar(s));
  if h <> 0 then
  begin
    Form2 := TForm2.CreateParented(h);//关键
    Form2.Show;
  end
  else
  begin
    ShowMessage('未找到宿主程序，程序无法继续进行。');
    Application.Terminate;
  end;
end;

end.

Form2代码

unit Unit2;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls;

type
  TForm2 = class(TForm)
    Label1: TLabel;
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form2: TForm2;

implementation

{$R *.dfm}

procedure TForm2.FormClose(Sender: TObject; var Action: TCloseAction);
begin
  Application.Terminate;
end;

procedure TForm2.FormCreate(Sender: TObject);
begin

end;

end.