Arrays are sequences, containing a fixed number of instances of the same type.
The recommended way to create array types is by multiplying a data type with a positive integer:
TenPointsArrayType = POINT * 10
Here is an example of an somewhat artifical data type, a structure containing 4 POINTs among other stuff:
>>> from ctypes import * >>> class POINT(Structure): ... _fields_ = ("x", c_int), ("y", c_int) ... >>> class MyStruct(Structure): ... _fields_ = [("a", c_int), ... ("b", c_float), ... ("point_array", POINT * 4)] >>> >>> print len(MyStruct().point_array) 4 >>>
Instances are created in the usual way, by calling the class:
arr = TenPointsArrayType() for pt in arr: print pt.x, pt.y
The above code print a series of 0 0
lines, because the array
contents is initialized to zeros.
Initializers of the correct type can also be specified:
>>> from ctypes import * >>> TenIntegers = c_int * 10 >>> ii = TenIntegers(1, 2, 3, 4, 5, 6, 7, 8, 9, 10) >>> print ii <c_long_Array_10 object at 0x...> >>> for i in ii: print i, ... 1 2 3 4 5 6 7 8 9 10 >>>
See About this document... for information on suggesting changes.