浅析python 动态库m.so.1.0错误问题

$ python -V python: error while loading shared libraries: libpython3.6m.so.1.0: cannot open shared object file: No such file or directory

ldd是列出动态库依赖关系：

$ ldd /usr/local/bin/python3.6linux-vdso.so.1 => (0x00007fffecbba000)libpython3.6m.so.1.0 => not foundlibpthread.so.0 => /usr/lib64/libpthread.so.0 (0x00007fe1400ff000)libdl.so.2 => /usr/lib64/libdl.so.2 (0x00007fe13fefb000)libutil.so.1 => /usr/lib64/libutil.so.1 (0x00007fe13fcf8000)libm.so.6 => /usr/lib64/libm.so.6 (0x00007fe13f9f6000)libc.so.6 => /usr/lib64/libc.so.6 (0x00007fe13f628000)/lib64/ld-linux-x86-64.so.2 (0x00007fe14031b000)

查找动态库：

$ find / -name ’libpython3.6m.so.1.0’/root/Python-3.6.9/libpython3.6m.so.1.0/usr/local/lib/libpython3.6m.so.1.0

(2)将libpython3.6m.so.1.0文件路径的目录添加到/etc/ld.so.conf :

$ vim /etc/ld.so.conf 文件末尾新添加一行，/usr/local/lib/

(3)保存，使得修改生效：

$ ldconfig

ps：下面看下python中使用动态库的方法

首先，创建一个简单的动态库

编程生成dll.so: gcc -fPIC -O2 -shared dll.c -o dll.soC文件:dll.c 如下

#include <stdio.h>struct param { int a; int b; char c; float f; int arr[3]; }; void print0(struct param arg){ printf('in print:n'); printf('a: %dn', arg.a); printf('b: %dn', arg.b); printf('c: %cn', arg.c); printf('f: %fn', arg.f); printf('arr: %d %d %dn', arg.arr[0], arg.arr[1], arg.arr[2]);}void print2(struct param *arg){ printf('in print2 :n'); printf('a: %dn', arg->a); printf('b: %dn', arg->b); printf('c: %cn', arg->c); printf('f: %fn', arg->f); printf('arr: %d %d %dn', arg->arr[0], arg->arr[1], arg->arr[2]);}void print3(int a){ printf('in print3:n'); printf('a: %dn', a);}

python定义传给动态库的结构体

from ctypes import *class ss(Structure): _fields_ = [ ('a', c_int), ('b', c_int), ('c', c_char), ('f', c_float), ('arr', c_int*3), //定义数组 ]

python 使用dll.so实例

#加载动态库fileName = '/home/primax/Desktop/Work/Test/python/dll.so'lib = cdll.LoadLibrary(fileName)#定义变量param = ss()#给结构体赋值param.a = 1param.b = 2param.c = ’a’param.f = 1.2345param.arr[0] = 0param.arr[1] = 1param.arr[2] = 2lib.print0(param)lib.print3(2)#传指针 pointer取指针lib.print2(pointer(param))

总结

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