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unit Unit1;
interface
uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls;
type TForm1 = class(TForm) Button1: TButton; Button2: TButton; procedure Button1Click(Sender: TObject); procedure FormCreate(Sender: TObject); procedure FormDestroy(Sender: TObject); procedure Button2Click(Sender: TObject); private { Private declarations } public { Public declarations } end;
var Form1: TForm1;
implementation
{$R *.dfm}
uses IniFiles; //THashedStringList 来自 IniFiles 单元var Hash: THashedStringList;
{ THashedStringList 继承自 TStringList, 只是覆盖了 IndexOf、IndexOfName 两个方法以增加效率; 如果注重效率而不需要太多功能, 可以使用 TStringHash, 它是直接从 TObject 继承的数组链表 }
//建立哈希表procedure TForm1.FormCreate(Sender: TObject);var i: Integer;begin Hash := THashedStringList.Create;
for i := 97 to 122 do begin Hash.Add(Chr(i) + '=' + IntToStr(i)); end;
ShowMessage(Hash.Text);{构建结果: a=97 b=98 c=99 d=100 e=101 f=102 g=103 h=104 i=105 j=106 k=107 l=108 m=109 n=110 o=111 p=112 q=113 r=114 s=115 t=116 u=117 v=118 w=119 x=120 y=121 z=122}end;
//检索哈希表procedure TForm1.Button1Click(Sender: TObject);var i: Integer;begin i := Hash.IndexOf('z=122'); ShowMessage(IntToStr(i)); //25
i := Hash.IndexOfName('z'); ShowMessage(IntToStr(i)); //25end;
//基本操作procedure TForm1.Button2Click(Sender: TObject);begin Hash.Values['a'] := '65'; //赋值 Hash.ValueFromIndex[0] := '65'; //用索引赋值
ShowMessage(Hash.Values['z']); //122, 取值 ShowMessage(Hash.ValueFromIndex[25]);//122, 用索引取值
{其他操作参加 TStringList}end;
procedure TForm1.FormDestroy(Sender: TObject);begin Hash.Free;end;
end.
Delphi 中的哈希表(2): TStringHashunit Unit1;
interface
uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls;
type TForm1 = class(TForm) Button1: TButton; Button2: TButton; procedure FormCreate(Sender: TObject); procedure FormDestroy(Sender: TObject); procedure Button1Click(Sender: TObject); procedure Button2Click(Sender: TObject); private { Private declarations } public { Public declarations } end;
var Form1: TForm1;
implementation
{$R *.dfm}
uses IniFiles; //TStringHash 来自 IniFiles 单元var Hash: TStringHash;
{ TStringHash 的功能非常简单, 如果需要更多功能应该使用: THashedStringList TStringHash 与 THashedStringList、TStringList 最大的不同是: TStringHash 的 Key 必须是 String; Value 必须是 Integer. 如果这不适合你的要求, 建一个 TMyHash 也不是难事 }
//建立哈希表procedure TForm1.FormCreate(Sender: TObject);var i: Integer;begin Hash := TStringHash.Create(26); //26 是表的初始大小, 可以省略使用默认值256 for i := 65 to 90 do begin Hash.Add(Chr(i),i); //如果表不够大,会自动增加的 end;end;
//读取procedure TForm1.Button1Click(Sender: TObject);var num: Integer;begin num := Hash.ValueOf('Z'); ShowMessage(IntToStr(num)); //90end;
//修改、删除、清空procedure TForm1.Button2Click(Sender: TObject);begin Hash.Modify('Z',100); //修改 Hash.Remove('A'); //删除 Hash.Clear; //清空
{没了, 就这些功能}end;
procedure TForm1.FormDestroy(Sender: TObject);begin Hash.Free;end;
end.
https://www.cnblogs.com/del/archive/2007/12/18/1003845.html
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