1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
|
# CStruct Examples
require 'cstruct'
# struct Point in Ruby:
class Point < CStruct
int32:x
int32:y
end
# struct PointF in Ruby:
class PointF < CStruct
double:x
double:y
end
class Addition < CStruct
char :description,[32]
end
# write file
File.open("point.bin","wb")do |f|
point = Point.new {|st| st.x = 100; st.y =200 }
point_f = PointF.new{|st| st.x = 20.65; st.y =70.86 }
addition = Addition.new
addition.description= "Hello Ruby!"
f.write point.data
f.write point_f.data
f.write addition.data
end
#read file
File.open("point.bin","rb")do |f|
point = Point.new
point_f = PointF.new
addition = Addition.new
point << f.read(Point.size)
point_f << f.read(PointF.size)
addition << f.read(Addition.size)
puts point.x
puts point.y
puts point_f.x
puts point_f.y
puts addition.description.to_cstr
end
|
