像dll中的窗体一般用模态窗体,这样其内存比较容易控制,而不要交给其主属性如application等处理,做个小例子供你参考一下
已调试,运行ok)
unit DLLForm;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TfrmDLL = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
frmDLL: TfrmDLL;
procedure SynAPP(App:THandle);stdcall;
procedure ShowForm;stdcall;
implementation
uses Math;
{$R *.dfm}
procedure SynAPP(App:THandle );stdcall;
begin
Application.Handle := App;
end;
procedure ShowForm;stdcall;
begin
try
frmDLL := TfrmDLL.Create (Application);
try
frmDLL.ShowModal;
finally
frmDLL.Free;
end;
except
on E: Exceptiondo
MessageDlg ('Error in DLLForm: ' +
E.Message, mtError, [mbOK], 0);
end;
end;
procedure TfrmDLL.Button1Click(Sender: TObject);
begin
Color := RandomRange(0,255 * 255 * 255 );
end;
end.
*************************************************
library FormDLL;
{ Important note about DLL memory management: ShareMem must be the
first unit in your library's USES clause AND your project's (select
Project-View Source) USES clause if your DLL exports any procedures or
functions that pass strings as parameters or function results. This
applies to all strings passed to and from your DLL--even those that
are nested in records and classes. ShareMem is the interface unit to
the BORLNDMM.DLL shared memory manager, which must be deployed along
with your DLL. To avoid using BORLNDMM.DLL, pass string information
using PChar or ShortString parameters. }
uses
SysUtils,
Classes,
Forms,
DLLForm in 'DLLForm.pas' {frmDLL};
{$R *.res}
exports
SynAPP,ShowForm;
begin
end.
****************************************************************
unit testDLLForm;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TForm1 = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
procedure SynAPP(App:THandle);stdcall;external 'FormDLL.dll';
procedure ShowForm;stdcall;external 'FormDLL.dll';
implementation
{$R *.dfm}
procedure TForm1.Button1Click(Sender: TObject);
begin
SynApp(Application.Handle );
ShowForm ;
end;
end.