"Georg" <nob...@nowhere.org> wrote in message
news:7pb8ubfll...@mid.individual.net...
Hi Mark,
many thanks for your valuable help.
# numVars contains size of returned arrays. Recast to access.
varNamesArray = c.cast(varNames,c.POINTER(PCHAR * numVars.value))
varTypesArray = c.cast(varTypes,c.POINTER(INT * numVars.value))
One last question: You created an object varNamesArray as an ctypes array.
This object has a method "contents". How do I find out what other methods
this objects has? For instance a method to retrieve the size of the array?
Is this documented somewhere?
The "contents" property is how you dereference a ctypes pointer. See
"16.15. ctypes" and specifically "16.15.1.14. Pointers" in the Python 2.6.4
documentation. "16.15.1.13. Arrays" documents that arrays support len().
import ctypes as c
a = (c.c_int * 5)()
p = c.pointer(a)
p.contents # p points to an array of 5 integers
<__main__.c_long_Array_5 object at 0x009B46C0>
len(p.contents) # or just len(a)
5
You can use "dir(p)" or "help(p)" to find out information about methods and
attributes of an object. Both show that 'p' has a contents attribute and
'a' supports the __len__ method.
-Mark
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