unit1.pas

本光盘是《Delphi 7应用教程》一书的配套光盘

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Edit1: TEdit;
    Label1: TLabel;
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    OpenDialog1: TOpenDialog;
    Label2: TLabel;
    Edit2: TEdit;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation
   var
     F1: TextFile;//定义一个文本文件变量
{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
   OpenDialog1.Execute ;//弹出打开对话框
   edit1.Text :=OpenDialog1.FileName; //显示要打开的文件名
end;

procedure TForm1.Button2Click(Sender: TObject);//打开文件并把文件内容显示在Memo1中
var
 ch:char;  //存放读取的字符
 n,flag:integer; //存放字符个数和标记是否为空白字符
begin
  If length(Edit1.Text)<>0 then //输入了文件名
     begin
         AssignFile(F1,Edit1.Text );
         Reset(F1);
         n:=0; flag:=0;//
         while not eof(F1)  do //不是文件的结尾
            Begin
               read(F1,ch); //读取一个字符
               if (ch=' ') Or (ord(ch)=13) Or (Ord(ch)= 9) then
                      flag:=0    //如果是空白字符，则标记Flag的值置0
                else
                   if flag=0 then //如果不是空白字符，且前面是空白字符
                      begin
                          flag:=1; //标志Flag置1，表示该字符不是空白字符
                          n:=n+1; //单词数加1
                      end;
            end;
         Edit2.Text :=Inttostr(n);
     end
     else
        ShowMessage('必须输入文件名');
end;
procedure TForm1.Button3Click(Sender: TObject);
Begin
  CloseFile(f1);Application.Terminate;  //关闭文件
end;


end.