Taking Electronic Snapshots of Your Computer Screen.

Fuente: ERIC Institute of Education Sciences

Saved in:

Bibliographic Details
Main Author:	Ekhaml, Leticia
Format:	Recurso educativo Open Access
Language:	en
Published:	1997
Subjects:	Computer Graphics Computer Software Computer Uses in Education Electronic Text Information Transfer Screens (Displays)
Online Access:	Acceder al recurso
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author	Ekhaml, Leticia
author_facet	Ekhaml, Leticia Ekhaml, Leticia
collection	Education Resources Information Center
contents	Taking Electronic Snapshots of Your Computer Screen. Ekhaml, Leticia Computer Graphics Computer Software Computer Uses in Education Electronic Text Information Transfer Screens (Displays) Examines screen capture, the technique of transferring an on-screen image or monitor display to a text or graphics file using a built-in utility feature or specialized software. Discusses uses of screen captures; kinds, sources, common, and uncommon features of software; and the simplest ways to screen capture on Macs and Windows-based computers. (PEN)
format	Recurso educativo Open Access
id	eric_EJ541402
institution	ERIC Institute of Education Sciences
language	en
publishDate	1997
record_format	eric
spellingShingle	Taking Electronic Snapshots of Your Computer Screen. Ekhaml, Leticia Computer Graphics Computer Software Computer Uses in Education Electronic Text Information Transfer Screens (Displays) Taking Electronic Snapshots of Your Computer Screen. Ekhaml, Leticia Computer Graphics Computer Software Computer Uses in Education Electronic Text Information Transfer Screens (Displays) Examines screen capture, the technique of transferring an on-screen image or monitor display to a text or graphics file using a built-in utility feature or specialized software. Discusses uses of screen captures; kinds, sources, common, and uncommon features of software; and the simplest ways to screen capture on Macs and Windows-based computers. (PEN)
title	Taking Electronic Snapshots of Your Computer Screen.
topic	Computer Graphics Computer Software Computer Uses in Education Electronic Text Information Transfer Screens (Displays)
url	https://eric.ed.gov/?id=EJ541402

if (filemtime($filename) + $maxlifetime < time()) { unlink($filename); $count++; } } return $count; } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ protected function saveSession($sessId, $data): bool { $sessFile = $this->path . '/sess_' . $sessId; if ($handle = fopen($sessFile, 'w')) { $return = false; // Lock the file for exclusive access to avoid issues with multiple // processes writing session simultaneously: if (flock($handle, LOCK_EX)) { $return = fwrite($handle, $data); // Make sure that there's no trailing data by truncating the file to // the correct length: ftruncate($handle, strlen($data)); fflush($handle); flock($handle, LOCK_UN); } fclose($handle); if ($return !== false) { return true; } } // If we got this far, something went wrong with the file output... // It is tempting to throw an exception here, but this code is called // outside of the context of exception handling, so all we can do is // echo a message.

// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return 0; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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