python ctypes 指针,Python Ctypes传递数据指针

I am accessing an API and can't get the data returned. The two float pointers will point to an array of data. I must assume the API is working properly. A different function call provides a the length of the data I am retrieving. This values is length down below when attempted.

C Header for Function

int function(int, float * data1, float * data2)

ctypes setup

dll.function.argtypes = (c_int, POINTER(c_float), POINTER(c_float))

dll.function.restypes = c_int

Failed Attempt 1:

x = c_float()

y = c_float()

status = dll.function(1, byref(x), byref(y))

Program crashes OR Access violation writing.

Failed Attempt 2:

x = POINTER(c_float)()

y = POINTER(c_float)()

status = dll.function(1, x, y)

Null Pointer Error

Failed Attempt 3:

dl