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 >> Delphi調用WinAPI 字符及字符串函數(13)

Delphi調用WinAPI 字符及字符串函數(13)

編輯:Delphi

lstrcmp、lstrcmpi - 對比串

lstrcmp 區分大小寫; lstrcmpi 不區分大小寫. 返回值: -1、0、1, 其中 0 表示相 同.

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}
const
 Msgs: array[-1..1] of Char = ('<', '=', '>');
procedure TForm1.Button1Click(Sender: TObject);var
 p1,p2: PChar;
 n: Integer;
begin
 p1 := 'A';
 p2 := 'B';
 n := lstrcmp(p1, p2);
 ShowMessageFmt('%s %s %s', [p1, Msgs[n], p2]); {A < B}
 n := lstrcmpi(p1, p2);
 ShowMessageFmt('%s %s %s', [p1, Msgs[n], p2]); {A < B}
end;
procedure TForm1.Button2Click(Sender: TObject);var
 p1,p2: PChar;
 n: Integer;
begin
 p1 := 'A';
 p2 := 'a';
 n := lstrcmp(p1, p2);
 ShowMessageFmt('%s %s %s', [p1, Msgs[n], p2]); {A > a}
 n := lstrcmpi(p1, p2);
 ShowMessageFmt('%s %s %s', [p1, Msgs[n], p2]); {A = a}
end;
procedure TForm1.Button3Click(Sender: TObject);var
 p1,p2: PChar;
 n: Integer;
begin
 p1 := 'ABC';
 p2 := 'abcd';
 n := lstrcmp(p1, p2);
 ShowMessageFmt('%s %s %s', [p1, Msgs[n], p2]); {ABC < abcd}
 n := lstrcmpi(p1, p2);
 ShowMessageFmt('%s %s %s', [p1, Msgs[n], p2]); {ABC < abcd}
end;
{這和 Delphi 的 CompareStr、CompareText 區別還是很大}

procedure TForm1.Button4Click(Sender: TObject);var
 p1,p2: PChar;
 n: Integer;
begin
 p1 := 'A';
 p2 := 'a';
 n := CompareStr(p1, p2);
 ShowMessage(IntToStr(n)); {-32}
 n := CompareText(p1, p2);
 ShowMessage(IntToStr(n)); {0}
end;
{和 StrComp、StrIComp、StrLComp、StrLIComp 也不一樣}

procedure TForm1.Button5Click(Sender: TObject);var
 p1,p2: PChar;
 n: Integer;
begin
 p1 := 'A';
 p2 := 'a';
 n := StrComp(p1, p2);
 ShowMessage(IntToStr(n)); {-32}
 n := StrIComp(p1, p2);
 ShowMessage(IntToStr(n)); {0}
 n := StrLComp(p1, p2, 1);
 ShowMessage(IntToStr(n)); {-32}
 n := StrLIComp(p1, p2, 1);
 ShowMessage(IntToStr(n)); {0}
end;
end.

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