夢(mèng)開始的地方

?????? 在使用windows系統(tǒng)時(shí)，我們會(huì)發(fā)現(xiàn)，一種類型的文件總是可以用指定的應(yīng)用程序打開，如:doc文件，雙擊可以打開文件，在使用delphi開發(fā)應(yīng)用程序時(shí)，同樣需要實(shí)現(xiàn)上邊的功能，其核心就獲取系統(tǒng)當(dāng)前的文件，而ParamStr函數(shù)起到了非常重要的作用，先面我們簡(jiǎn)單用 Delphi開發(fā)以個(gè)應(yīng)用程序來說明問題:
首先，用 delphi新建立一個(gè)工程,然后分別創(chuàng)建窗體MainFrm,MyMDIChildForm,添加相應(yīng)的控件,如下圖

?????????? ?
?????????????????????????????????????? ??? MainFrm

???????????????
????????????????????????????????????????? ? MyMDIChildForm



代碼如下:
Unit1.pas(對(duì)應(yīng)于MainFrm窗體)
unit Unit1;

interface

uses
? Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
? Dialogs, Menus,Unit2, ComCtrls;

type
? TMainFrm = class(TForm)
??? MainMenu1: TMainMenu;
??? ItemNew: TMenuItem;
??? N1: TMenuItem;
??? N2: TMenuItem;
??? N3: TMenuItem;
??? OpenDialog1: TOpenDialog;
??? StatusBar1: TStatusBar;
??? procedure ItemNewClick(Sender: TObject);
??? procedure N3Click(Sender: TObject);
??? procedure FormShow(Sender: TObject);
??? function CreateMDI():TMyMDIChildForm;
? private
??? { Private declarations }
? public
??? { Public declarations }
? end;

var
? MainFrm: TMainFrm;

implementation

{$R *.dfm}

procedure TMainFrm.ItemNewClick(Sender: TObject);
var
child: TMyMDIChildForm;
begin
?child:= TMyMDIChildForm.create(Self);
end;

procedure TMainFrm.N3Click(Sender: TObject);

begin
? if opendialog1.Execute then
?? begin

????? CreateMDI.RichEdit1.Lines.LoadFromFile(opendialog1.FileName);
????? Self.StatusBar1.Panels[1].Text:=opendialog1.FileName;
?? end;

end;

procedure TMainFrm.FormShow(Sender: TObject);
var
?FileName:String;
begin
?? FileName:=ParamStr(1);
?? if FileExists(FileName) then
??? begin
????? CreateMDI.RichEdit1.Lines.LoadFromFile(FileName);
??? end;
end;

?

function TMainFrm.CreateMDI: TMyMDIChildForm;
var
child: TMyMDIChildForm;
begin
??? child:= TMyMDIChildForm.create(Self);
??? Result:=child;
end;

end.
unit2.pas(對(duì)應(yīng)于MyMDIChildForm窗體)
unit Unit2;

interface

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

type
? TMyMDIChildForm = class(TForm)
??? RichEdit1: TRichEdit;
??? procedure FormClose(Sender: TObject; var Action: TCloseAction);
? private
??? { Private declarations }
? public
??? { Public declarations }
? end;

var
? MyMDIChildForm: TMyMDIChildForm;

implementation

{$R *.dfm}

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

end.
這樣我們實(shí)現(xiàn)了一個(gè)簡(jiǎn)單的記事本程序,運(yùn)行結(jié)果如下圖:

??????????????


然后,我們將工程保存,并生成最終的EXE文件,然后我們?cè)赪indows系統(tǒng)目錄任意創(chuàng)建一個(gè)文件,
如下圖ResumeAction.java文件

?????????????????????????

然后將它的打開方式設(shè)置成我們自己的可執(zhí)行程序
???????????????????????????????????

然后再雙擊此文件,程序正確運(yùn)行,并將它打開了!
????????????

程序的核心就是paramStr函數(shù),它獲得了系統(tǒng)接口,得到了當(dāng)前的文件名稱!

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