Fix Thrift 0.2.0 Installation with Ruby 1.9.1
When I try the command "gem install thrift" with Ruby 1.9.1, I got a compilation error with something related to a C function "strlcpy()".
Then I searched the web. It seems I am not alone and the community know it.
However I do not want to wait for official update, I want to try Cassandra and Thrift is a dependency I have to use now.
So, read on if you want a dirty fix.
Start command line console and run:
$ gem install thrift
If you got the error with "strlcpy", you should have thrift code downloaded in your ruby gems folder.
It is "C:\Ruby\lib\ruby\gems\1.9.1\gems\thrift-0.2.0" for my computer on Windows.
$ cd C:\Ruby\lib\ruby\gems\1.9.1\gems\thrift-0.2.0\ext
If you are using linux, check the lib/.../ext folder.
Open "extconf.rb" and "struct.c" with a text editor. Comment out HAVE_STRLCPY in "struct.c" like this:
/*
#ifndef HAVE_STRLCPY
static
size_t
strlcpy (char *dst, const char *src, size_t dst_sz)
{ ...
}
#endif
*/
Comment out have_func line in "extconf.rb" like this:
# have_func("strlcpy", "string.h")
Then run:
$ cd C:\Ruby\lib\ruby\gems\1.9.1\gems\thrift-0.2.0
$ ruby setup.rb
$ gem spec C:\Ruby\lib\ruby\gems\1.9.1\cache\thrift-0.2.0.gem --ruby > \
C:\Ruby\lib\ruby\gems\1.9.1\specifications\thrift-0.2.0.gemspec
$ gem list
You should see "thrift (0.2.0)" is in your local installed gem list.
相关文档：
ruby中自带实现观察者模式的类observer。可以利用它来实现观察者模式。
代码例子：
# -*- coding: GB2312 -*-
require 'observer'
# 观察者模式(ruby)的使用例子
# 被观察者P
class PObservable
include Observable
end
# 观察者A
class AObserver
# update方法名是必须的要有的
def update(arg)
puts "AO ......
原文连接： http://hi.baidu.com/%B7%CF%B2%C5%CB%FB%B8%E7/blog/item/09c19411244152daf7039ec4.html
通过命令行查看ruby版本信息：
ruby -v
命令行运行程序：
方法1.
ruby -e 'print "hello ruby"'
-e 表示将后面的一行作为ruby程序
print 是ruby的一个内置函数
方法2.交互编译环境
irb （命令行输入后， ......
#一、定义一个类
class Person
def initialize(name,age=18)
@name=name;
@age=age;
@motherland="china";
end
def talk
puts "my name is "+@name+" and I am "+@age.to_s
&nb ......
喜欢玩阿月系列RPG游戏的我，跟不少童鞋一样下了RPGMakerXP来瞻仰一下。当时觉得这个软件太方便了，用鼠标随便点点就能弄出来个有趣的小游戏。因为里面不仅自带不少地图和人物行走图等素材，容易上手的操作方式也让自己大有成就感……可是游戏毕竟是离不开编程，解开游戏包，看 ......
