[ctypes-users] Re: [Q] How can I realloc() enable?

[Paul M. <pf_...@ya...>]

=?ks_c_5601-1987?B?seggseK/tQ==?= <nta...@ho...> writes:

> When I pass 'some python variable;s pointer' to C(.so) using c_char_p
> type or pointer()... does it possible that re-size python variable in
> .c files(realloc())?
>
> I tried... but impossible.

I would imagine it isn't possible. After all, Python variables aren't
"raw" memory created via malloc.

> Does anyone success it?

I'd guess you should use malloc directly. Something like this (totally
untested!!!) might work

    ptr = cdll.msvcrt.malloc(100) # This is a raw pointer
    cdll.msvcrt.strcpy(ptr, "Hello, world!") # Fill with raw C functions
    my_dll_function(ptr) # Call the DLL - no need for pointer()
    result = (c_char * 200)() # ctypes char array
    cdll.msvcrt.strcpy(pointer(result), ptr)
    cdll.msvcrt.free(ptr)

That's deep black magic, and I'm *sure* I got it wrong. But you may be
able to work from the general principle.

Paul
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