Изучение работы с файлами на языке Delphi

Текстпрограммы:

unit Unit1;

interface

uses

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

Dialogs, StdCtrls, Grids, Buttons;

type

s30=string[30];

P = record

tovar: string[30];

money: integer;

kol: integer;

itogo: integer;

end;

TForm1 = class(TForm)

StringGrid1: TStringGrid;

Button1

: TButton;

Button2: TButton;

Edit1: TEdit;

Label1: TLabel;

Button3: TButton;

Edit2: TEdit;

Label2: TLabel;

BitBtn1: TBitBtn;

Edit3: TEdit;

Button4: TButton;

Button5: TButton;

Edit4: TEdit;

procedure Button2Click(Sender: TObject);

procedure Button1Click(Sender: TObject);

procedure FormCreate(Sender: TObject);

procedure Button3Click(Sender: TObject);

procedure BitBtn1Click(Sender: TObject);

procedure Button4Click(Sender: TObject);

procedure Button5Click(Sender: TObject);

private

{ Private declarations }

public

{ Public declarations }

end;

var

Form1: TForm1;

implementation

{$R *.dfm}

function poisk(istochnik,chto:s30):boolean;

var i,k:integer;

procedure poisk2(B,M:s30);

var k:integer; b1:boolean;

begin

i:=0;

while length(b)>=length(m)+i do

begin

b1:=true;

for k:=1 to length(m) do begin

if m[k]=b[k+i] then else b1:=false;

end;

if b1=true then begin poisk:=b1; exit; end; i:=i+1;

end;

end;

begin

if length(istochnik)>=length(chto) then

poisk2(istochnik,chto)

else

poisk2(chto,istochnik);

end;

procedure TForm1.Button2Click(Sender: TObject);

var i:integer; s:string; z:p;

f: file of p;

begin

s:=edit1.Text;

system.Assign(f,s); // íàçíà÷àåòñÿ èìÿ ôàéëîâîé ïåðåìåííîé

rewrite(f); // ñîäàíèå ïóñòîãî ôàéëà, óêàçàòåëü óñòàí. íà íóëåâîé ýë-ò

for i:=1 to stringgrid1.RowCount do if (stringgrid1.Cells[0,i]<>'') then

begin

z.tovar:=stringgrid1.cells[0,i];

z.money:=strtoint(stringgrid1.cells[1,i]);

z.kol:=strtoint(stringgrid1.cells[2,i]);

write(f,z); // çàïèñü â ôàéë f çàïèñè z

end;

system.close(f);

end;

procedure TForm1.Button1Click(Sender: TObject);

var i:integer; z:p;

f: file of p;

begin

i:=1;

system.Assign(f,edit1.Text);

reset(f); // îòêðûòü ôàéë

while not eof(f) do

begin

read(f,z);

stringgrid1.cells[0,i]:=z.tovar;

stringgrid1.cells[1,i]:=inttostr(z.money);

stringgrid1.cells[2,i]:=inttostr(z.kol);

stringgrid1.RowCount:=i+1;

i:=i+1;

end;

system.close(f);

end;

procedure TForm1.FormCreate(Sender: TObject);

begin

stringgrid1.Cells[0,0]:='Òîâàð';

stringgrid1.Cells[1,0]:='Ñòîèìîñü';

stringgrid1.Cells[2,0]:='Êîë-âî';

stringgrid1.Cells[3,0]:='Èòîãî';

end;

procedure TForm1.Button3Click(Sender: TObject);

Var i:integer;

begin

edit2.Text:='0';

for i:=1 to stringgrid1.RowCount-1 do

begin

stringgrid1.cells[3,i]:=Floattostr(strtoint(stringgrid1.Cells[1,i])*(strtoint(stringgrid1.Cells[2,i])));

edit2.Text:=floattostr(strtofloat(stringgrid1.cells[3,i])+strtofloat(edit2.text));

end;

end;

procedure TForm1.BitBtn1Click(Sender: TObject);

var i,k:integer;

begin

i:=1;

repeat

if stringgrid1.Cells[0,i]=edit3.text then

begin

k:=i;

while k<stringgrid1.RowCount-1 do

begin

stringgrid1.Cells[0,k]:=stringgrid1.Cells[0,k+1];

stringgrid1.Cells[1,k]:=stringgrid1.Cells[1,k+1];

stringgrid1.Cells[2,k]:=stringgrid1.Cells[2,k+1];

stringgrid1.Cells[3,k]:=stringgrid1.Cells[3,k+1];

k:=k+1;

end;

stringgrid1.RowCount:=stringgrid1.RowCount-1;

end;

i:=i+1;

until stringgrid1.RowCount-1<i;

end;

procedure TForm1.Button4Click(Sender: TObject);

var i:integer;

begin

stringgrid1.RowCount:=stringgrid1.RowCount+1;

for i:=0 to 4 do

stringgrid1.cells[i,stringgrid1.RowCount-1]:='';

end;

procedure TForm1.Button5Click(Sender: TObject);

var i:integer; z:p;

f: file of p;

begin

system.Assign(f,edit1.Text);

reset(f); // îòêðûòü ôàéë

stringgrid1.RowCount:=2;

stringgrid1.Cells[0,1]:='Íå íàéäåíî';

for i:=1 to 3 do

stringgrid1.Cells[i,1]:='';

i:=1;

while (not eof(f)) and (edit4.text<>'') do

begin

read(f,z);

if poisk(AnsiUpperCase(z.tovar),AnsiUpperCase(edit4.text)) then

begin

stringgrid1.cells[0,i]:=z.tovar;

stringgrid1.cells[1,i]:=inttostr(z.money);

stringgrid1.cells[2,i]:=inttostr(z.kol);

stringgrid1.RowCount:=i+1;

i:=i+1;

end;

end;

system.close(f);

end;

end.

Тестирование:

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