Archive for 4th September 2009
WordPress plugin: Contact form 7
It’s easy to use and powerful. You can build a complex form in minutes. However, it took me some time to understand the “Mail” function on the form building page. In fact it is used to define the format and contents of email that sent to the form owner once somebody submits it. The keywords used in the mail template are the same as defined in the above form design. You can also add additional help texts into the email contents to clearly inform you what the exact information is. For example, I built a form with two check boxes, by default only the text of the checked box(es) will be inserted in the email. It’s hard to know their meaning.
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VirtualBox运行同一个OS的多个实例
运行多个虚拟机不能通过简单的复制VDI文件（即虚拟映像文件）, 因为每个VDI文件有唯一的UUID号来对应相应的虚拟机，而在简单的复制不会改变这个UUID号码，需要通过VirtualBox的工具来克隆VDI文件。
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ReCAPTCHA技术
不得不说这是一个很好很有用的创意！
CAPTCHAs是一种恼人的技术，据资料统计，全球用户每天要完成1亿次 CAPTCHA 测试。ReCAPTCHA是 Carnegie Mellon 大学启动的一个项目，目的是借助 CATPTCHA 技术将那些残旧图书数字化，据估计，该技术每天可以完成160本书。
该项目目前已经在40000家网站上部署了 ReCAPTCHA 技术，ReCAPTCHA 的基本原理是，对光学字符识别（OCR）软件来说，它们的辨识能力是有限的，尤其是那些印刷不清晰的旧书或残书，而人类可以凭借自己的阅读经验，轻松识别 那些 OCR 无法识别的文字。对这样的文字，人类的识别成功率可以达到99%，而OCR软件只能达到80%。
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