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| unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, Buttons, StdCtrls, Grids;
type
TForm1 = class(TForm)
Edit1: TEdit;
Label1: TLabel;
Label2: TLabel;
Edit2: TEdit;
Previous: TButton;
Label3: TLabel;
Edit3: TEdit;
Next: TButton;
Label4: TLabel;
Edit4: TEdit;
Save: TButton;
New: TButton;
Delete: TButton;
BitBtn1: TBitBtn;
GroupBox1: TGroupBox;
Memo1: TMemo;
Bvivod: TButton;
GroupBox2: TGroupBox;
Edit5: TEdit;
Button1: TButton;
GroupBox3: TGroupBox;
Edit6: TEdit;
Button2: TButton;
StringGrid1: TStringGrid;
Button3: TButton;
procedure FormCreate(Sender: TObject);
procedure BitBtn1Click(Sender: TObject);
procedure NewClick(Sender: TObject);
procedure SaveClick(Sender: TObject);
procedure PreviousClick(Sender: TObject);
procedure NextClick(Sender: TObject);
procedure DeleteClick(Sender: TObject);
procedure BvivodClick(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure Button1Click(Sender: TObject);
procedure Button3Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
type TNote = record
Naim:string [30];
Avt: string [15];
God: Integer;
Cen: Real;
end;
Var NoteFile: file of TNote; // ôàéëîâàÿ ïåðåìåííàÿ
NoteData: TNote; // âñïîìîãàòåëüíàÿ ïåðåìåííàÿ
Pos: integer; // óêàçàòåëü êîìïîíåíòà ôàéëà
Naim2:String[30]; //Ïåðåìåííàÿ äëÿ çàïðîñà íàèìåíîâàíèÿ
Avt2: String[15]; //Ïåðåìåííàÿ äëÿ çàïðîñà àâòîðà
TextNoteFile: text;
procedure ShowRecord; // ïðîöåäóðà îòîáðàæàåò òåêóùóþ çàïèñü â ôîðìå
begin
Form1.Edit1.Text:=NoteData.Naim;
Form1.Edit2.Text:=NoteData.Avt;
Form1.Edit3.Text:=IntToStr(NoteData.God);
Form1.Edit4.Text:=FloatToStr(NoteData.Cen);
end;
procedure ClearData; // ïðîöåäóðà î÷èùàåò îêíà Editl-Edit4
begin
Form1.Edit1.Text:= ' ';
Form1.Edit2.Text:= ' ';
Form1.Edit3.Text:= ' ';
Form1.Edit4.Text:= ' ';
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
AssignFile(NoteFile,'DAT2.DAT');
if not FileExists('DAT2.DAT') then begin Rewrite(NoteFile); Pos:=0; end
else begin Reset(NoteFile); Pos:=0; if not Eof(NoteFile) then begin
Read(NoteFile,NoteData); Pos:=FilePos(NoteFile) -1;
ShowRecord; Delete.Enabled:=true; if FileSize(NoteFile)>=2 then
Begin
Previous.Enabled:=true;
Next.Enabled:=true;
end;
end; end; end;
procedure TForm1.BitBtn1Click(Sender: TObject);
begin
CloseFile(NoteFile);
Close;
end;
procedure TForm1.NewClick(Sender: TObject);
begin
ClearData;
Edit1.SetFocus;
Pos:=FileSize(NoteFile);
Seek(NoteFile,Pos);
Previous.Enabled:=false;
Next.Enabled:=false;
Delete.Enabled:=false;
Save.Enabled:=true;
end;
procedure TForm1.SaveClick(Sender: TObject);
begin
NoteData.Naim:=Edit1.Text;
NoteData.Avt:=Edit2.Text;
NoteData.God:=StrToInt (Edit3.Text) ;
NoteData.Cen:=StrToFloat(Edit4.Text) ;
Write(NoteFile,NoteData);
Next.Enabled:=false;
Save.Enabled:=false;
Delete.Enabled:=true;
if FileSize(NoteFile)>=2 then Previous.Enabled:=true;
end;
procedure TForm1.PreviousClick(Sender: TObject);
begin
Next.Enabled:=true;
if Pos<>0 then dec(Pos);
Seek(NoteFile,Pos);
Read(NoteFile,NoteData);
ShowRecord;
if Pos=0 then Previous.Enabled:=false;
end;
procedure TForm1.NextClick(Sender: TObject);
begin
Previous.Enabled:=true;
if Pos=FileSize(NoteFile) -2 then Next.Enabled:=false;
inc(Pos);
Seek(NoteFile,Pos) ;
Read(NoteFile,NoteData) ;
ShowRecord;
end;
procedure TForm1.DeleteClick(Sender: TObject);
var i:byte;
begin
if Pos=FileSize(NoteFile) -1 then begin Seek(NoteFile,Pos); Truncate(NoteFile); Next.Enabled:=false;
if Pos<>0 then dec(Pos) else begin Delete.Enabled:=false; ClearData;exit; end;
end else begin for i:=Pos+1 to FileSize(NoteFile) -1 do
begin Seek(NoteFile,i); Read(NoteFile,NoteData); Seek(NoteFile,i-1); Write(NoteFile,NoteData);end;
Seek(NoteFile,FileSize(NoteFile) -1); Truncate(NoteFile); end;
Seek(NoteFile,Pos); Read(NoteFile,NoteData); ShowRecord; if Pos=0 then Previous.Enabled:=false; end;
procedure TForm1.BvivodClick(Sender: TObject);
begin
Reset(NoteFile);
Seek (NoteFile,0);
while not eof (NoteFile) do
begin
read(NoteFile,NoteData);
Memo1.Lines.Add(NoteData.Naim + ' ' + NoteData.Avt + ' ' + IntToStr (NoteData.God) + ' ' + FloatToStr(NoteData.Cen));
end;
CloseFile (NoteFile);
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
Naim2:= Edit5.Text;
While not eof (NoteFile) do
begin
Read (NoteFile,NoteData);
If NoteData.Naim = Naim2 then
begin
ShowRecord;
break;
end;
end;
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
Avt2 := Edit6.Text;
While not eof (NoteFile) do
begin
Read (NoteFile,NoteData);
If NoteData.Avt = Avt2 then
begin
ShowRecord;
break;
end;
end;
end;
procedure TForm1.Button3Click(Sender: TObject);
var
y:byte;
begin
While not eof (NoteFile) do
begin
StringGrid1.Cells[1,y]:= NoteData.Naim;
StringGrid1.Cells[2,y]:= NoteData.Avt;
StringGrid1.Cells[3,y]:= IntToStr (NoteData.God);
StringGrid1.Cells[4,y]:= FloatToStr(NoteData.Cen);
y:=y+1;
end;
end;
end. |
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Сообщение от Bogdand
