At Wednesday 27/9/2006 22:58, Podi wrote:
I have a C function in the dll does the following:
DLL_API int dll_foo(char **data, size_t *size)
{
strcpy(*data, "hello");
*size = strlen(*data);
return 0;
}
So I would call the function as such,
char data[8];
size_t size;
int status = dll_foo(&data, &size);
I have tried the following in Python but not able to get it working...
Any help would be appreciated!
from ctypes import *
mydll = windll.mydll
array = c_char * 8
data = array()
size = c_long()
status = mydll.dll_foo(byref(data), byref(size))
Traceback (most recent call last):
File "<interactive input>", line 1, in ?
WindowsError: exception: access violation writing 0x00000000
I'd use your last try. But since it didnt work, use a prototype and
see what happens:
data = create_string_buffer('\000' * 8)
size = c_long()
dll_foo = mydll.dll_foo
dll_foo.argtypes = [POINTER(c_char_p), POINTER(c_long)]
status = dll_foo(byref(data), byref(size))
Are you sure your function is compiled using the stdcall calling
convention? I'm not sure what means DLL_API.
Gabriel Genellina
Softlab SRL
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