$ 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/python3.6 linux-vdso.so.1 => (0x00007fffecbba000) libpython3.6m.so.1.0 => not found libpthread.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.so
C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: %d\n", arg.a);
printf("b: %d\n", arg.b);
printf("c: %c\n", arg.c);
printf("f: %f\n", arg.f);
printf("arr: %d %d %d\n", arg.arr[0], arg.arr[1], arg.arr[2]);
}
void print2(struct param *arg)
{
printf("in print2 :\n");
printf("a: %d\n", arg->a);
printf("b: %d\n", arg->b);
printf("c: %c\n", arg->c);
printf("f: %f\n", arg->f);
printf("arr: %d %d %d\n", arg->arr[0], arg->arr[1], arg->arr[2]);
}
void print3(int a)
{
printf("in print3:\n");
printf("a: %d\n", 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 = 1 param.b = 2 param.c = 'a' param.f = 1.2345 param.arr[0] = 0 param.arr[1] = 1 param.arr[2] = 2 lib.print0(param) lib.print3(2) #传指针 pointer取指针 lib.print2(pointer(param))
总结
