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| unit Unit1;
interface
uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls;
type TForm1 = class(TForm) ListBox1: TListBox; Button7: TButton; procedure Button7Click(Sender: TObject); private public end;
var Form1: TForm1;
implementation
{$R *.dfm} type Tdaten=ansistring;
const st_laenge=8; linebr=2;
procedure datei_leeren(Filename:string); var fs: TFileStream; begin fs := TFileStream.Create(Filename, fmOpenReadWrite or fmShareDenyWrite); try fs.Size := 0; finally fs.Free; end; end;
procedure InsertData(Filename:string; const P, Len: Int64; insert: Tdaten); const BufSize = $00010000; var Buf: PChar; N: Integer; Size, Z: Int64; fs:Tstream; begin fs := TFileStream.Create (Filename, fmopenreadwrite); GetMem(Buf, BufSize); try Z := 0; Size := fs.Size; repeat if (Size-Z)-P < BufSize then N := (Size-Z)-P else N := BufSize; fs.Position := Size-Z-N; fs.Read(Buf^, N); fs.Position := Size-Z-N+Len; fs.Write(Buf^, N); Inc(Z, N); until (Size-Z) = P;
fs.Position:=p; if insert <> '' then fs.Write (insert[1], len); fs.Write(sLineBreak, Length(sLineBreak));
finally FreeMem(Buf, BufSize); end; fs.Free; end;
procedure SaveStringToFile (st_laenge1:word; Filename:string; SaveString: tdaten; npos:integer); var fs: TFileStream; begin fs := TFileStream.Create (Filename, fmopenreadwrite); try fs.Position:=npos; if SaveString <> '' then fs.Write (SaveString[1], st_laenge1); fs.Write(sLineBreak, Length(sLineBreak)); finally fs.Free; end; end;
procedure TForm1.Button7Click(Sender: TObject); var str:string; i,id1,n:cardinal; data:tdaten; y:byte; breite:word; begin datei_leeren(ExtractFilePath(Application.ExeName) + '1feld.dat');
str:='Luftballon';
breite:=1; n:=0; savestringtofile(breite,ExtractFilePath(Application.ExeName) + '1feld.dat',str,n); breite:=2; n:=3; savestringtofile(breite,ExtractFilePath(Application.ExeName) + '1feld.dat',str,n); breite:=3; n:=7; savestringtofile(breite,ExtractFilePath(Application.ExeName) + '1feld.dat',str,n); breite:=4; n:=12; savestringtofile(breite,ExtractFilePath(Application.ExeName) + '1feld.dat',str,n); breite:=5; n:=18; savestringtofile(breite,ExtractFilePath(Application.ExeName) + '1feld.dat',str,n); breite:=6; n:=25; savestringtofile(breite,ExtractFilePath(Application.ExeName) + '1feld.dat',str,n);
insertdata(ExtractFilePath(Application.ExeName) + '1feld.dat',3,4,'Mond'); end;
end. |