PHP使用GD库实现截屏

PHP5.2.2以上版本的GD库实现了两个截屏函数 imagegrabscreen 和 imagegrabwindow分别用于截取整个屏幕和截取某个窗口（同ALT+PrintScreen）的屏幕。

1. 截取整个屏幕 Screenshot

<?php
$im = imagegrabscreen();
imagepng($im, "myscreenshot.png");
?>

2. 截取一个窗口 Capture a window (IE for example)

<?php
$browser = new COM("InternetExplorer.Application");
$handle = $browser->HWND;
$browser->Visible = true;
$im = imagegrabwindow($handle);
$browser->Quit();
imagepng($im, "iesnap.png");
$im = imagegrabscreen();
?>

3. 截取IE内容 Capture a window (IE for example) but with its content!

<?php
$browser = new COM("InternetExplorer.Application");
$handle = $browser->HWND;
$browser->Visible = true;
$browser->Navigate("http://www.507pc.com/");
 
/* Still working? */
while ($browser->Busy) {
    com_message_pump(4000);
}
$im = imagegrabwindow($handle, 0);
$browser->Quit();
imagepng($im, "iesnap.png");
?>

4. 截取IE的全屏模式 IE in fullscreen mode

<?php
$browser = new COM("InternetExplorer.Application");
$handle = $browser->HWND;
 
$browser->Visible = true;
$browser->FullScreen = true;
$browser->Navigate(http://www.csroad.cn/);
 
/* Is it completely loaded? (be aware of frames!)*/
while ($browser->Busy) {
    com_message_pump(4000);
}
$im = imagegrabwindow($handle, 0);
$browser->Quit();
imagepng($im, "iesnap.png");
?>

I use Internet Example Explorer as example, if you like to play more with IE and com, check out the IBrowser2 documentation at MSDN. It should work with any kind of window as long as you give the correct handle (usually $obj->HWND).

* php_gd2.dll for 5.2.x thread safe build* php gd image documentation* IE manual (useful to tweak it from com_dotnet