How to read from pointer address in Python?

Question

I want to read in a Python script a number of bytes starting from a specific address. E.g., I want to read 40000 bytes starting from 0x561124456.

The pointer is give

Answer 1

Once I got a pointer of memory location from C, I found "list(listSize * listDataType).from_address(memoryPointer)" created a internal copy of C memeory. If the data in memory is huge, Python takes a long time to create a list object by using internal copy. To avoid internal copy, I used the ctypelib.as_array in python:

import ctypes
import binascii
import numpy as np

myCfunslib.getData.restype = ctypes.c_void_p
#myCfunslib.getData.restype=ctypes.POINTER(ctypes.c_ubyte)#no need to cast
dataSize = 1092 * 1208
#call the c function to get the data memory pointer
cMemoryPointer = myCfunslib.getData();
newpnt = ctypes.cast(cMemoryPointer, ctypes.POINTER(ctypes.c_ubyte))
# and construct an array using this data
DataBytes = np.ctypeslib.as_array(newpnt, (dataSize,)) #no internal copy
print "the mid byte of the data in python side is ", DataBytes[dataSize/2]