Capturar tela??

var bitmap : tbitmap;
jpg : tjpegimage;
dc : hdc;
desktoprect : trect;
desktopcanvas : tcanvas;
x, y : integer;

begin
  dc:=getdc(getdesktopwindow);
  try
  desktopcanvas:=tcanvas.create;
  bitmap:=tbitmap.create;
  jpg:=tjpegimage.create;
  try
  bitmap.Width:=320;
  bitmap.Height:=240;
  desktopcanvas.handle:=dc;
  desktoprect:=rect(0,0,319,239);
  bitmap.canvas.CopyRect(desktoprect,desktopcanvas,desktoprect);
  img.Picture.Bitmap:=bitmap;

  for y:=yy to yy+10 do
  for x:=xx to xx+10 do
  img.canvas.pixels[x,y]:=clwhite;

  with jpg do
  begin
    compressionquality:=25;
    assign(bitmap);
    compress;
    savetofile(´data´+filename);
  end;
  finally
  bitmap.free;
  desktopcanvas.free;
end;
finally
releasedc(getdesktopwindow,dc);
end;
end;