查看字符串在不同编码(ASCII、Unicode、UTF7、UTF8、Default、BigEndianUnicode)下的 Hex

IsLetter: {是否是个字母; 范围 A..Z 与 a..z}

IsUpper:  {是否是个大写字母; 范围 A..Z}

IsLower:  {是否是个小写字母; 范围 a..z}

IsDigit:  {是否是个十进制数字; 范围 0..9}

IsNumber: {是否是个数字符号; 范围包括 0..9, 还有 ASCII 码中的 178、179、185、188、189、190 等}

测试代码:

---

unit Unit1;

 

interface

 

uses

  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

  Dialogs, StdCtrls;

 

type

  TForm1 = class(TForm)

    Button1: TButton;

    Button2: TButton;

    Button3: TButton;

    Button4: TButton;

    Button5: TButton;

    procedure Button1Click(Sender: TObject);

    procedure Button2Click(Sender: TObject);

    procedure Button3Click(Sender: TObject);

    procedure Button4Click(Sender: TObject);

    procedure Button5Click(Sender: TObject);

  end;

 

var

  Form1: TForm1;

 

implementation

 

{$R *.dfm}

 

uses Character;

 

{IsLetter: 是否是个字母}

procedure TForm1.Button1Click(Sender: TObject);

var

  b1,b2,b3: Boolean;

begin

  b1 := IsLetter('A'); {是}

  b2 := IsLetter('a'); {是}

  b3 := IsLetter('9'); {否}

  ShowMessageFmt('%s,%s,%s', [BoolToStr(b1,True),BoolToStr(b2,True),BoolToStr(b3,True)]);

  {True,True,False}

 

  b1 := IsLetter('D2009', 1);

  b2 := IsLetter('D2009', 2);

  ShowMessageFmt('%s,%s', [BoolToStr(b1,True),BoolToStr(b2,True)]);

  {True,False}

end;

 

{IsUpper: 是否是个大写字母}

procedure TForm1.Button2Click(Sender: TObject);

var

  b1,b2,b3: Boolean;

begin

  b1 := IsUpper('A'); {是}

  b2 := IsUpper('a'); {否}

  b3 := IsUpper('9'); {否}

  ShowMessageFmt('%s,%s,%s', [BoolToStr(b1,True),BoolToStr(b2,True),BoolToStr(b3,True)]);

  {True,False,False}

 

  b1 := IsUpper('Delphi', 1);

  b2 := IsUpper('Delphi', 2);

  ShowMessageFmt('%s,%s', [BoolToStr(b1,True),BoolToStr(b2,True)]);

  {True,False}

end;

 

{IsLower: 是否是个小写字母}

procedure TForm1.Button3Click(Sender: TObject);

var

  b1,b2,b3: Boolean;

begin

  b1 := IsLower('A'); {否}

  b2 := IsLower('a'); {是}

  b3 := IsLower('9'); {否}

  ShowMessageFmt('%s,%s,%s', [BoolToStr(b1,True),BoolToStr(b2,True),BoolToStr(b3,True)]);

  {False,True,False}

 

  b1 := IsLower('Delphi', 1);

  b2 := IsLower('Delphi', 2);

  ShowMessageFmt('%s,%s', [BoolToStr(b1,True),BoolToStr(b2,True)]);

  {False,True}

end;

 

{IsDigit: 是否是个十进制数字}

procedure TForm1.Button4Click(Sender: TObject);

var

  b1,b2,b3: Boolean;

begin

  b1 := IsDigit('A'); {否}

  b2 := IsDigit('½'); {否}

  b3 := IsDigit('9'); {是}

  ShowMessageFmt('%s,%s,%s', [BoolToStr(b1,True),BoolToStr(b2,True),BoolToStr(b3,True)]);

  {False,False,True}

 

  b1 := IsDigit('D2009', 1);

  b2 := IsDigit('D2009', 2);

  ShowMessageFmt('%s,%s', [BoolToStr(b1,True),BoolToStr(b2,True)]);

  {False,True}

end;

 

{IsNumber: 是否是个数字符号}

procedure TForm1.Button5Click(Sender: TObject);

var

  b1,b2,b3: Boolean;

begin

  b1 := IsNumber('A'); {是}

  b2 := IsNumber('½'); {是}

  b3 := IsNumber('9'); {否}

  ShowMessageFmt('%s,%s,%s', [BoolToStr(b1,True),BoolToStr(b2,True),BoolToStr(b3,True)]);

  {False,True,True}

 

  b1 := IsNumber('123¹²³¼½¾', 1);

  b2 := IsNumber('123¹²³¼½¾', 4); {这里的 9 个字符全都复合}

  ShowMessageFmt('%s,%s', [BoolToStr(b1,True),BoolToStr(b2,True)]);

  {True,True}

end;

 

end.