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.
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照例可以先看端程序
class Person
def initialize( name,age=18 )
@name = name
@age = age
@motherland = "China"
end
def talk
puts "my name is "+@name+", age is "+@age.to_s
&n ......
irb 是从命令行运行的
irb 的命令行选项（摘自 Porgramming Ruby 第二版）
-f
禁止读取~/.irbrc Suppress reading ~/.irbrc.
-m
数学模式（支持分数和矩阵） Math mode (fraction and matrix support is available).
-d
设置#DEBUG为true(同ruby -d一样) Set $DEBUG to true (same as ``ruby -d'').
-r lo ......
#一、数组引用
arr=[3,4,5,6,7,8,9]
puts arr[0] #3
puts arr.first #3
puts arr[arr.length-1] #9
puts arr[arr.size-1] #9
puts arr.last #9
puts arr[-1] #9
puts arr[-2] #8
print arr[1..3] ,"\n" #456
print arr[-3,4] ,"\n" #789，从-3开始 ，打印4个元素，这里只有三个
#Ruby的数组大小是动态的，你能够 ......
#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 ......
