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PHP怎样抓屏?

Windows下用PHP做网页截图

在Apache的服务属性里,“登录”选项卡中选中“允许服务与桌面交换”就行了!

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<?php $browser = new COM("InternetExplorer.Application");$handle = $browser->HWND;$browser->Visible = true;$browser->Width = 500;$browser->Height = 500;$browser->Navigate("http://www.un.org");/* Still working? */while ($browser->Busy) {    com_message_pump(4000);}$im = imagegrabwindow($handle, 0);$browser->Quit();imagepng($im, "iesnap.png");?> 

?运行这段代码的时候服务器上会弹出一个IE窗口并自动打开指定的网站,截屏后窗口自动关闭,相当傻瓜!

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Linux下用PHP做网页截图

上alexa 时,总能看到alexa 显示被查询网站的首页截图,这个截图是怎么实现的呢。
通过察看页面内容,发现原来是通过调用amazon的服务程序获得的。
http://ast.amazonaws.com/Xino/?Action=Redirect&Service=AlexaSiteThumbnail&Url=baidu.com&
AWSAccessKeyId=1FVZ0JNEJDA5TK457CR2&Signature=tz4xyqDNcSf8A1v%2BpDo4todvM9c%3D&
Size=Small&Timestamp=2008-03-04T06%3A04%3A47.422Z&
DefaultImage=http%3A%2F%2Fclient.alexa.com%2Fcommon%2Fimages%2Fnoimages.gif
如果想在自己的网站中做出这种效果,完全可以在amazon申请一个ID获得这样的调用接口来实现。
但是,这样怎么符合探究精神?所以,经过一番翻箱倒柜,找到下面的方法来自己实现网站的首页截图。

实现网站首页页面缩略图制作。
步骤:
1. 启动一个页面抓取工具,抓取选定的网站首页;
2.存储抓取的页面截图到服务器上;
3.按照需要显示的大小处理抓取的页面截图;
4.把结果展现给用户
综上所述,其实关键是在于需要有一个稳定的抓取工具,经过在网上寻找,找到下面几个工具。

在windows环境下,可以考虑这个工具软件来抓页面截图:
IECapt.exe
在linux环境下,可以考虑这个工具软件来抓页面截图:
HTML2Image
获得抓取工具之后,就可以采用任何一种服务器语言编写程序,调用这个抓取工具,然后把抓取结果返回给用户。
下面是利用IECapt.exe并结合PHP抓取网站截图的例子。
在Windows/Apache2.2/Php5.2.5 下运行通过。

参考资料:
1.http://www.zubrag.com/scripts/website-thumbnail-generator.php
2.http://www.guangmingsoft.net/htmlsnapshot/html2image.htm

官方url:http://www.guangmingsoft.net/htmlsnapshot/html2image.htm
Linux kernel- 2.2.14及以上: 安装必需lib及相关软件
yum install -y glibc gtk+ fontconfig??cairo libpixman pango pango-devel
下载html2image
wget http://www.guangmingsoft.net/htmlsnapshot/html2image.i386.tar.gz
tar xvzf html2image.i386.tar.gz
CD html2image
设置LD_LIBRARY_PATH路径
export LD_LIBRARY_PATH=./
mkdir /usr/X11R6/lib
ln - s /usr/share/X11 /usr/X11R6/lib/X11
运行Xvfb
./Xvfb :1 -screen 0 640x480x24 -nolisten tcp -audit 4 -auth X1.cfg & export DISPLAY=:1
生成图片
./html2image www.google.com a.jpg
可忽略的错误:
error opening security policy file /usr/X11R6/lib/X11/xserver/SecurityPolicy
Could not init font path element /usr/X11R6/lib/X11/fonts/TTF/, removing from list!
Could not init font path element /usr/X11R6/lib/X11/fonts/Speedo/, removing from list!
Could not init font path element /usr/X11R6/lib/X11/fonts/Type1/, removing from list!
Could not init font path element /usr/X11R6/lib/X11/fonts/CID/, removing from list!
生成1024x768 格式 容量
jpg 871K
gif 4.12M
png 1.13M

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