查找字符串

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ComCtrls;

type
  TForm1 = class(TForm)
    RichEdit1: TRichEdit;
    Button1: TButton;
    FindDialog1: TFindDialog;
    procedure Button1Click(Sender: TObject);
    procedure FindDialog1Find(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
  FindDialog1.Position := Point(RichEdit1.Left + RichEdit1.Width, RichEdit1.Top);
//设置查找对话框的位置
  FindDialog1.Execute;
//启动查找对话框
end;

 

procedure TForm1.FindDialog1Find(Sender: TObject);
var
  FoundAt: LongInt;
  StartPos, ToEnd: Integer;
begin
  with RichEdit1 do
  begin
    //如果有要找的字符串，则将对话框显示在当前字符串后面
    //如果没有找到，将其停在文件的开始位置
    if SelLength <> 0 then
      StartPos := SelStart + SelLength
    else
      StartPos := 0;
      ToEnd := Length(Text) - StartPos;
FoundAt := FindText(FindDialog1.FindText, StartPos, ToEnd, [stMatchCase]);
    //设定要查找的字符串
    if FoundAt <> -1 then
    begin
      SetFocus;
      SelStart := FoundAt;
      SelLength := Length(FindDialog1.FindText);
    end;
  end;
end;

end.