使用DLL檔案中封裝的視窗 (轉)

使用DLL檔案中封裝的視窗 (轉)[@more@]

使用DLL中封裝的視窗

徐長友

文章摘要：
  編寫時常常使用到DLL檔案，本文就使用DLL檔案中封裝的視窗來說說中在DLL如何封裝視窗，如何DLL中封裝的視窗，及MDI-Child在DLL中載入並使用

一、在DLL中封裝視窗
 開啟Delphi新建一個DLL工程，儲存為usedll，生成程式碼

library usedll;

{ Important note about DLL memory management: ShareMem must be the
first unit in your library's USES clause AND your project's (
Project-View ) 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;

{$R *.res}

begin
end.

新建一個窗體，新增一個Label和Button，設定如下：

Form1: TForm1
Left = 192
Top = 133
Width = 334
Height = 221
Caption = 'DLL'#20013#20351#29992#31383#20307
Color = clBtnFace
Font.Charset = DEFAULT_CHARSET
Font.Color = clWindowText
Font.Height = -11
Font.Name = 'MS Sans Serif'
Font.Style = []
OldCreateOrder = False
PixelsPerInch = 96
TextHeight = 13
object Label1: TLabel
Left = 104
Top = 80
Width = 80
Height = 13
Caption = 'DLL'#20013#20351#29992#31383#20307
end
object Button1: TButton
Left = 120
Top = 152
Width = 75
Height = 25
Caption = #30830#23450
TabOrder = 0
OnClick = Button1Click
end
end

新增一過程：procedure LoadForm; export;
procedure LoadForm;
begin
Form1 := TForm1.Create(Application);
try
Form1.ShowModal;
finally
Form1.Free;
end;
end;

全部完整的程式碼：

library usedll;

uses
SysUtils,
Classes,
Form_Unit in 'Form_Unit.pas' {Form1};

{$R *.res}
exports
LoadFoindex 1;
begin

end.

 

unit Form_Unit;

interface

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

type
TForm1 = class(TForm)
Label1: TLabel;
Button1: TButton;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;
ApplicationName: String;
procedure LoadForm(Handle: THandle; AppName: ShortString); export;

implementation

{$R *.dfm}
procedure LoadForm(Handle: THandle; AppName: ShortString);
begin
Application.Handle := Handle;
ApplicationName := AppName;
Form1 := TForm1.Create(Application);
try
Form1.ShowModal;
finally
Form1.Free;
end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
self.close;
end;

end.

編譯後生成usedll.dll檔案，至此DLL檔案就完成了

二、呼叫DLL中封裝的視窗

 新建一個工程，新增一個Button，窗體佈局如下：

object Form1: TForm1
Left = 192
Top = 133
Width = 336
Height = 222
Caption = 'Form1'
Color = clBtnFace
Font.Charset = DEFAULT_CHARSET
Font.Color = clWindowText
Font.Height = -11
Font.Name = 'MS Sans Serif'
Font.Style = []
OldCreateOrder = False
PixelsPerInch = 96
TextHeight = 13
object Button1: TButton
Left = 128
Top = 88
Width = 75
Height = 25
Caption = #25171#24320#31383#20307
TabOrder = 0
OnClick = Button1Click
end
end

完整的程式碼如下：

unit Use_Unit;

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 LoadForm; external 'usedll.dll' index 1;
implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
LoadForm;
end;

end.

三、MDI-Child在DLL中載入並使用
 如果是MDI-Child又如何在DLL中載入並使用呢，下面就這個問題說說使用DLL檔案中封裝的視窗。
新建一個DLL工程，儲存為mdidll，再新建一個窗體，FormStyle設為fsMDIChild，如下：
object Form1: TForm1
Left = 192
Top = 133
Width = 344
Height = 234
Caption = 'MDI'
Color = clBtnFace
Font.Charset = DEFAULT_CHARSET
Font.Color = clWindowText
Font.Height = -11
Font.Name = 'MS Sans Serif'
Font.Style = []
FormStyle = fsMDIChild
OldCreateOrder = False
Position = poDefault
Visible = True
OnClose = FormClose
PixelsPerInch = 96
TextHeight = 13
end

程式碼如下：

unit mdi_Unit;

interface

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

type
TForm1 = class(TForm)
procedure FormClose(Sender: TObject; var Action: TCloseAction);
private
{ Private declarations }
public
{ Public declarations }
MyParentForm: TForm;
MyParentApplication: TApplication;
end;

var
DllApplication: TApplication;
implementation

{$R *.dfm}

procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
Action:=caFree;
end;

end.

library mdidll;

uses
Windows,
Messages,
SysUtils,
Classes,
Graphics,
Controls,
Forms,
Dialogs,
mdi_Unit in 'mdi_Unit.pas' {Form1};

procedure LoadChild(ParentApplication: TApplication; ParentForm: TForm); export; stdcall;
var
Form1: TForm1;
DllProc: Pointer;

begin
Application:=ParentApplication;
Form1:=TForm1.Create(ParentForm);
Form1.MyParentForm:=ParentForm;
Form1.MyParentApplication:=ParentApplication;
Form1.Show;
end;

procedure DLLUnloadProc(Reason: Integer); register;
begin
if Reason = DLL_PROCESS_DETACH then Application:=DllApplication;
end;

{$R *.res}
exports
LoadChild;
begin
DllApplication:=Application;
DLLProc := @DLLUnloadProc;
end.

編譯後生成mdidll.dll檔案。
使用DLL中的MDI-Child視窗如下：

 新建一個工程，主視窗設定如下FormStyle設為fsMDIForm：
object Form1: TForm1
Left = 192
Top = 133
Width = 544
Height = 375
Caption = 'Form1'
Color = clBtnFace
Font.Charset = DEFAULT_CHARSET
Font.Color = clWindowText
Font.Height = -11
Font.Name = 'MS Sans Serif'
Font.Style = []
FormStyle = fsMDIForm
Menu = MainMenu1
OldCreateOrder = False
PixelsPerInch = 96
TextHeight = 13
object MainMenu1: TMainMenu
Left = 72
Top = 136
object N1: TMenuItem
Caption = #26032#24314'(&N)'
OnClick = N1Click
end
end
end
程式碼：

unit usemdi_Unit;

interface

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

type
TForm1 = class(TForm)
MainMenu1: TMainMenu;
N1: TMenuItem;
procedure N1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
T_ProvaChild = procedure (ParentApplication: TApplication; ParentForm: TForm); stdcall;
var
Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.N1Click(Sender: TObject);
var
DllHandle: THandle;
ProcAddr: Froc;
ProvaChild: T_ProvaChild;
begin
DllHandle := LoadLibrary('mdidll');
ProcAddr := GetProcAddress(DllHandle, 'LoadChild');
if ProcAddr <> nil then
begin
ProvaChild := ProcAddr;
ProvaChild(Application,Self);
end;
end;

end.

結束語：
 到這裡你應該會用Delphi呼叫DLL檔案中封裝的視窗了吧，如果還有不明白的話請與我聯絡(主頁: ,:to:yousoft@chinaren.com">yousoft@chinaren.com)