sum_str.~pas

在一个QQ群的聊天中,朋友说让我统计下各人发言的次数。并把聊天记录（就在QQ的信息管理器里把该群的聊天记录导出为文本文件）发给了我。我的程序实现了输入某个该群里的QQ号码

unit sum_str;

interface

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

type
  TForm1 = class(TForm)
    Label1: TLabel;
    Edit1: TEdit;
    Label2: TLabel;
    Label3: TLabel;
    OpenDialog1: TOpenDialog;
    Button2: TButton;
    memo1: TMemo;
    Button1: TButton;
    procedure Button2Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  i,total:integer;
  fname:string;

implementation

{$R *.dfm}

procedure TForm1.Button2Click(Sender: TObject);
var
  k,n1,n2:integer;
  infile:TextFile;
  instring,ch,ch2:string;
begin
  i:=0;
  ch:=edit1.Text;
  n1:= length(edit1.Text);
  if opendialog1.Execute then
  begin
    fname:=opendialog1.FileName;
    AssignFile(infile,fname);
    Reset(infile);
    memo1.Lines.Add('-----------------------------------------------------------------------');
    memo1.Lines.Add('待统计的字符串为'+edit1.Text+'，长度为'+inttostr(n1));
    while not eof(infile) do
    begin
      total:=total+1;
      readln(infile,instring);
      n2:=length(instring)+1;
      //memo1.Lines.add(instring);
      if n2>n1 then
      begin
         for k:=1 to n2-n1  do
         begin
           ch2:=copy(instring,k,n1);
           if ch=ch2 then i:=i+1;
         end;
      end;
    end ;
    end;
    if ch='' then  showmessage('  待统计的字符串为空格，请确认。要统计其他字符串请重新运行！');
    memo1.Lines.Add('统计结果如下：');
    memo1.Lines.Add('该文件包含字符串'+edit1.Text+' 的个数为：'+inttostr(i));
    memo1.Lines.Add(' ');
    label3.Caption:='该文件总行数为：'+inttostr(total)+'.';
    label3.Caption:=label3.Caption+#13+'包含字符串'+edit1.Text+' 的个数为：'+inttostr(i)+'.';
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
   i:=0;
   //edit1.Text:='aniu';
   total:=0;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
   close;
end;

end.