ComponentToString & StringToComponent 無作用?? |
答題得分者是:hagar
|
jeffreck
高階會員 發表:247 回覆:340 積分:197 註冊:2003-01-23 發送簡訊給我 |
請教前輩!!
ComponentToString & StringToComponent 無作用?? 使用ComponentToString把Button轉一字串,再傳回來但沒作用?? strlist := ComponentToString(self.Button1); self.Button2 := StringToComponent(strlist) as TButton ; 不知那錯了??? 以下是我的程式碼,謝謝 unit Unit1; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls, Buttons, ExtCtrls, DBCtrls; type TForm1 = class(TForm) DBListBox1: TDBListBox; DBListBox2: TDBListBox; Shape1: TShape; BitBtn1: TBitBtn; Edit1: TEdit; Edit2: TEdit; Button1: TButton; Button2: TButton; Button3: TButton; Button4: TButton; procedure BitBtn1Click(Sender: TObject); private { Private declarations } public { Public declarations } end; var Form1: TForm1; implementation uses Unit2; {$R *.dfm} function ComponentToString(Component: TComponent): string; var BinStream:TMemoryStream; StrStream: TStringStream; s: string; begin BinStream := TMemoryStream.Create; try StrStream := TStringStream.Create(s); try BinStream.WriteComponent(Component); BinStream.Seek(0, soFromBeginning); ObjectBinaryToText(BinStream, StrStream); StrStream.Seek(0, soFromBeginning); Result:= StrStream.DataString; finally StrStream.Free; end; finally BinStream.Free end; end; function StringToComponent(Value: string): TComponent; var StrStream:TStringStream; BinStream: TMemoryStream; begin StrStream := TStringStream.Create(Value); try BinStream := TMemoryStream.Create; try ObjectTextToBinary(StrStream, BinStream); BinStream.Seek(0, soFromBeginning); Result := BinStream.ReadComponent(nil); finally BinStream.Free; end; finally StrStream.Free; end; end; procedure TForm1.BitBtn1Click(Sender: TObject); var strlist : string; begin strlist := ComponentToString(self.Button1); self.Button2 := StringToComponent(strlist) as TButton ; end; initialization //add RegisterClasses([TButton]); end. 謝謝各位前輩!! |
hagar
版主 發表:143 回覆:4056 積分:4445 註冊:2002-04-14 發送簡訊給我 |
改成如下試試:
procedure TForm1.BitBtn1Click(Sender: TObject); var strlist: string; begin strlist := ComponentToString(self.Button1); Self.Button2.Free; Self.Button2 := nil; Self.Button2 := StringToComponent(strlist) as TButton; Self.Button2.Parent := Self; // 指定 Parent 才能顯示 Button2.Left := Button1.Left Button1.Width; // 改變一下 Left 屬性,不然它是與 Button1 重疊在一起的 end;-- 向 KTop 的弟兄們致敬! |
jeffreck
高階會員 發表:247 回覆:340 積分:197 註冊:2003-01-23 發送簡訊給我 |
引言: 改成如下試試:謝謝前輩的回覆,這樣就可以了 但還有一個奇怪的問題?? 就是當物件為ListBox是,可以正常轉換 但如 ListBox的Items 有資料時就會錯誤 我試TreeView 也有相同情況?? 謝謝前輩!! 發表人 - jeffreck 於 2004/07/14 11:40:47procedure TForm1.BitBtn1Click(Sender: TObject); var strlist: string; begin strlist := ComponentToString(self.Button1); Self.Button2.Free; Self.Button2 := nil; Self.Button2 := StringToComponent(strlist) as TButton; Self.Button2.Parent := Self; // 指定 Parent 才能顯示 Button2.Left := Button1.Left + Button1.Width; // 改變一下 Left 屬性,不然它是與 Button1 重疊在一起的 end; |
hagar
版主 發表:143 回覆:4056 積分:4445 註冊:2002-04-14 發送簡訊給我 |
本站聲明 |
1. 本論壇為無營利行為之開放平台,所有文章都是由網友自行張貼,如牽涉到法律糾紛一切與本站無關。 2. 假如網友發表之內容涉及侵權,而損及您的利益,請立即通知版主刪除。 3. 請勿批評中華民國元首及政府或批評各政黨,是藍是綠本站無權干涉,但這裡不是政治性論壇! |