Python: converting strings for use with ctypes.c_void_p()

Question

given a string:

msg="hello world"

How can I define this as a ctypes.c_void_p() data type?

the following code yields a "cannot be converted to pointer" exception:

data=ctypes.c_void_p(msg)

data is required to be a void* type in C, because it is being passed to a DLL.

I'm assuming there is a way to pack/unpack the string using the struct package, but unfortunately I am very unfamiliar with this process.

S.Lott · Accepted Answer · 2008-11-25 17:12:04Z

13

Something like this? Using ctypes.cast?

>>> import ctypes
>>> p1= ctypes.c_char_p("hi mom")
>>> ctypes.cast( p1, ctypes.c_void_p )
c_void_p(11133300)

answered Nov 25, 2008 at 17:12

S.Lott

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