$ 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
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