ctypes char数组

资料

Python 官方说了 bytes 可以自动转为 char *。而且注意转变后是可修改的，看下面的示例：

文件

Makefile:

CC=gcc
AR=ar

LIB_NAME=mylib

shared_library:
    $(CC) -shared -fpic -o lib${LIB_NAME}.so *.c

get_lib: shared_library
    rm -rf lib/
    mkdir -p lib
    cp *.so lib/
    make clean

clean:
    rm -rf *.o *.so

main.py:

import ctypes

mylib = ctypes.cdll.LoadLibrary("./lib/libmylib.so")
length = 5
data = b"\x01" * (length + 2)
mylib.ModifyCharArray(data, length)
print(data)

lib.c:

int ModifyCharArray(char* array, int length) {
  for (int i = 0; i < length; i++) {
    array[i] += 1;
  }
}