whats new ¦  programming tips ¦  indy articles ¦  intraweb articles ¦  informations ¦  links ¦  interviews
 misc ¦  tutorials ¦  Add&Win Game

Tips (1541)

Database (90)
Files (137)
Forms (107)
Graphic (114)
IDE (21)
Indy (5)
Internet / LAN (130)
IntraWeb (0)
Math (76)
Misc (126)
Multimedia (45)
Objects/
ActiveX (51)

OpenTools API (3)
Printing (35)
Strings (83)
System (266)
VCL (242)

Top15

Tips sort by
component


Search Tip

Add new Tip

Add&Win Game

Advertising

30 Visitors Online


 
...encrypt a image?
Autor: adet
[ Print tip ]  

Tip Rating (7):  
     




procedure EncryptBMP(const BMP: TBitmap; Key: Integer);
var
  
BytesPorScan: Integer;
  w, h: integer;
  p: pByteArray;
begin
  try
    
BytesPorScan := Abs(Integer(BMP.ScanLine[1]) -
      Integer(BMP.ScanLine[0]));
  except
    raise 
Exception.Create('Error');
  end;
  RandSeed := Key;
  for h := 0 to BMP.Height - 1 do
  begin
    
P := BMP.ScanLine[h];
    for w := 0 to BytesPorScan - 1 do
      
P^[w] := P^[w] xor Random(256);
  end;
end;


procedure TForm1.Button1Click(Sender: TObject);
begin
  
EncryptBMP(Image1.Picture.Bitmap, 623);
  Image1.Refresh;
end;

{ Call the function again to decrypt it }
{ Zum Entschlüsseln die Funktion nochmals aufrufen }

 

Rate this tip:

poor
very good


Copyright © by SwissDelphiCenter.ch
All trademarks are the sole property of their respective owners