Screenshot with PHP ?

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PHP

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capture

screenshot

Hey

Is it possible to make a screenshot of a window in PHP ?

I've tried this:

$img = imagegrabscreen();
imagepng($img, 'screenshot.png');

But it creates a black .png file !

This also creates a black screen but the top of the browser is visible !

$browser = new COM("InternetExplorer.Application");
$handle = $browser->HWND;
$browser->Visible = true;
$browser->Navigate("http://www.libgd.org");

/* Still working? */
while ($browser->Busy) {
    com_message_pump(4000);
}
$im = imagegrabwindow($handle, 0);
$browser->Quit();
imagepng($im, "iesnap.png");
imagedestroy($im);