程序師世界是廣大編程愛好者互助、分享、學習的平台,程序師世界有你更精彩!
首頁
編程語言
C語言|JAVA編程
Python編程
網頁編程
ASP編程|PHP編程
JSP編程
數據庫知識
MYSQL數據庫|SqlServer數據庫
Oracle數據庫|DB2數據庫
 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> TTreeView講解 [6] - SaveToFile、LoadFromStream、SaveToStream、LoadFromFile

TTreeView講解 [6] - SaveToFile、LoadFromStream、SaveToStream、LoadFromFile

編輯:Delphi

 本例效果圖:

TTreeView講解 [6] - SaveToFile、LoadFromStream、SaveToStream、LoadFromFile

unit Unit1; 
 
interface 
 
uses 
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, 
 Dialogs, ComCtrls, StdCtrls, Grids, ExtCtrls; 
 
type 
 TForm1 = class(TForm) 
  TreeView1: TTreeVIEw; 
  Memo1: TMemo; 
  Panel1: TPanel; 
  Button1: TButton; 
  Button2: TButton; 
  Button3: TButton; 
  procedure FormCreate(Sender: TObject); 
  procedure Button1Click(Sender: TObject); 
  procedure Button2Click(Sender: TObject); 
  procedure Button3Click(Sender: TObject); 
 end; 
 
var 
 Form1: TForm1; 
 
implementation 
 
{$R *.dfm} 
 
{初始化 TreeVIEw1} 
procedure TForm1.FormCreate(Sender: TObject); 
var 
 Nodes: TTreeNodes; 
 node: TTreeNode; 
begin 
 TreeVIEw1.Align := alLeft; 
 Nodes := TreeVIEw1.Items; 
 node := Nodes.Add(nil, '一連長'); 
 node := Nodes.AddChild(node, '一排長'); 
 node := Nodes.AddChild(node, '一班長'); 
 node := Nodes.AddChild(node, '戰士1'); 
 Nodes.Add(node, '戰士2'); 
 Nodes.Add(node, '戰士3'); 
 Nodes.Add(node, '戰士4'); 
 node := node.Parent; 
 Nodes.Add(node, '二班長'); 
 Nodes.Add(node, '三班長'); 
 node := node.Parent; 
 Nodes.Add(node, '二排長'); 
 Nodes.Add(node, '三排長'); 
 node := node.Parent; 
 Nodes.Add(node, '二連長'); 
 Nodes.Add(node, '三連長'); 
end; 
 
{保存到文件} 
procedure TForm1.Button1Click(Sender: TObject); 
const 
 path = 'c:\temp\tree.txt'; 
begin 
 TreeVIEw1.SaveToFile(path); 
 TButton(Sender).Caption := '保存'; 
end; 
 
{從文件中載入} 
procedure TForm1.Button2Click(Sender: TObject); 
const 
 path = 'c:\temp\tree.txt'; 
begin 
 if FileExists(path) then TreeVIEw1.LoadFromFile(path); 
 TButton(Sender).Caption := '載入'; 
end; 
 
{從流中讀取} 
procedure TForm1.Button3Click(Sender: TObject); 
var 
 stream: TStream; 
begin 
 stream := TMemoryStream.Create; 
 try 
  Memo1.Lines.SaveToStream(stream); 
  stream.Position := 0; 
  TreeVIEw1.LoadFromStream(stream); 
 finally 
  stream.Free; 
 end; 
end; 
 
end. 

  注意: 上面例子中的"從流中讀取"部分, 對 Memo 中的數據格式有嚴格要求, 要求必須是樹狀結構;

  結構中可以用"空格"和"Tab"分層.

  1. 上一頁:
  2. 下一頁:
Copyright © 程式師世界 All Rights Reserved