强制ctypes.cdll.LoadLibrary（）从文件中重新加载库

本文介绍了强制ctypes.cdll.LoadLibrary（）从文件中重新加载库的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述 我有以下代码import ctypeslib1 = ctypes.cdll.LoadLibrary("./mylib.so")# modify mylib.so (code generation and compilation) or even delete itlib2 = ctypes.cdll.LoadLibrary("./mylib.so")问题是 lib2 是指原始共享库，而不是新共享库一。如果我在两次调用之间删除mylib.so，我不会出错。The problem is that lib2 refers to the original shared library, not the new one. If I delete mylib.so between the calls I get no error.使用 ctypes._reset_cache（）不会我如何告诉 ctypes 实际上是从硬盘上重新加载库的？How can I tell ctypes to actually reload the library from the hard disk?推荐答案我不知道如何指示 ctypes 如何卸载库（找不到 [Python 3]：ctypes-Python的外部函数库 I don't know how to instruct ctypes how to unload a library (didn't find a way on [Python 3]: ctypes - A foreign function library for Python, but that doesn't mean that there isn't one).可以通过强制加载器（减少库的引用​​计数并）卸载来手动完成此操作。通过 [man7]：DLCLOSE（3P）（也阅读 [man7]：DLOPEN（3）了解更多信息加载/卸载库）。It can be done manually, by forcing the loader to (decrement the library's reference count and) unload it via [man7]: DLCLOSE(3P) (also read [man7]: DLOPEN(3) for additional info on loading / unloading libraries). dll.c ：#include <stdio.h>int func0(int arg0) { int alter_factor = 2; printf("From C - arg0: %d, alter_factor: %d\n", arg0, alter_factor); return arg0 * alter_factor;} code.py ：#!/usr/bin/env python3import sysimport ctypesDLL_NAME = "./dll.so"def handle_dll(dll_name=DLL_NAME): dll_dll = ctypes.CDLL(dll_name) func0_func = dll_dll.func0 func0_func.argtypes = [ctypes.c_int] func0_func.restype = ctypes.c_int return dll_dll, func0_funcdef main(): dlclose_func = ctypes.CDLL(None).dlclose dlclose_func.argtypes = [ctypes.c_void_p] dlclose_func.restype = ctypes.c_int dll, func0 = handle_dll() res = func0(42) print(res) dlclose_func(dll._handle) input("In another terminal, modify the C code (e.g. change `alter_factor`), recompile (gcc -fPIC -shared -o dll.so dll.c), and when done press ENTER here...") dll, func0 = handle_dll() res = func0(42) print(res)if __name__ == "__main__": print("Python {:s} on {:s}\n".format(sys.version, sys.platform)) main() 输出： [cfati@cfati-ubtu16x64-0:~/Work/Dev/StackOverflow/q050964033]> python3 code.pyPython 3.5.2 (default, Nov 23 2017, 16:37:01)[GCC 5.4.0 20160609] on linuxFrom C - arg0: 42, alter_factor: 284In another terminal, modify the C code (e.g. change `alter_factor`), recompile (gcc -fPIC -shared -o dll.so dll.c), and when done press ENTER here...From C - arg0: 42, alter_factor: 3126 这篇关于强制ctypes.cdll.LoadLibrary（）从文件中重新加载库的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！