4月9号erlangR12B-2 release了 这次更新速度超快

Bug fix release : otp_src_R12B-2
Build date : 2008-04-09

This is bug fix release 2 for the R12B release.

看看什么变化。

基本上是bug fix， 添加了些bif 没有大的什么变动

It's a bugfix release and I had no big expectations when scanning through the release notes, but then I spotted this:

--- percept-0.7 ------------------------------------------------------------

OTP-7162 Percept no longer depends on external c-libraries. The
graphical rendering is now done via erlang code.

Thats huge, if you are interested in generating PNG images and don't wanna have dependencies on c-libraries (as you would have using my cairo wrapper erlycairo). Egd won't win any speed competition and has a limited feature set, but runs out of the box on any Erlang supported platform !

erlang不是不适合做图像处理之类的工作么。
另外请教下，外部c库是怎样调用的，是通过C node吗，然后C node与erlang node通讯？哪么C node又如何启动呢

c node是一个好方法 但是用port更普遍 port程序很容易写 用stdin stdout来通信 可以参考programming erlang书中的方法。

c node是个独立的程序 有main函数的哦 说白了就是通过ei通过网络给erlang的服务器发报文来指示服务器做什么的 或者接受服务器的消息的哦。