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procedure TForm1.Button1Click(Sender: TObject);
var Data: array [0..5000-1] of byte;
begin
readfs:=TFilestream.Create('D:\待删除\t1.jpg',fmOpenRead);
writefs:=TFilestream.Create('D:\待删除\t2.jpg',fmCreate);
readfs.Read(Data,5000); writefs.Write(Data,5000);
FreeAndNil(readfs); FreeAndNil(writefs);
end;
procedure TForm1.Button2Click(Sender: TObject);
var Data: array [0..30000-1] of byte;
begin
readfs:=TFilestream.Create('D:\待删除\t1.jpg',fmOpenRead);
writefs:=TFilestream.Create('D:\待删除\t2.jpg',fmCreate);
readfs.Seek(5000,soBeginning) ;
writefs.Seek(5000,soBeginning) ;
readfs.Read(Data,readfs.Size -5000);
writefs.Write(Data,readfs.Size -5000);
FreeAndNil(readfs); FreeAndNil(writefs);
end;