example of python ctypes

config/call_stack.dot

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+/* dot -Tpng call_stack.dot -o call_stack.png 
+* tlming16 
+* all wrongs reserved 
+*/
+digraph compile {
+  edge [fontname="FangSong"];
+  node [shape=box, fontname="FangSong" size="20,20"];
+  a[label="函数参数,\n rdi,rsi,rdx,rcx,r8,r9 \n 参数个数多余6个 \n 顺序\n nth\n ...\n 8th\n 7th"];
+  b[label="函数返回地址\n "];
+  c[label="上一帧栈%rbp地址\n push %rbp \n movq %rsp,%rbp"]; 
+  d[label="局部变量地址\n 起始地址为-n(%rbp) n为第一个变量的size\n 注意内存对齐"];
+  e[label="---"];
+  f[label="%esp 地址"];
+  a->b;
+  b->c;
+  c->d;
+  d->e;
+  e->f;
+
+}

config/mysql.md

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+# mysql （https://www.cnblogs.com/sfencs-hcy/p/9769505.html）
+
+- my.ini 
+
+  ```
+  [mysql]
+  # 设置mysql客户端默认字符集
+  default-character-set=utf8
+  [mysqld]
+  #设置3306端口
+  bind-address = 0.0.0.0
+  port = 3306
+  skip_grant_tables
+  # 设置mysql的安装目录
+  basedir=D:\\Applications\\mysql-8.0.21-winx64
+  # 设置mysql数据库的数据的存放目录
+  datadir=D:\\Applications\\mysql-8.0.21-winx64\\data
+  # 允许最大连接数
+  max_connections=200
+  # 服务端使用的字符集默认为8比特编码的latin1字符集
+  character-set-server=utf8
+  # 创建新表时将使用的默认存储引擎
+  default-storage-engine=INNODB
+  ```
+
+- mysqld --initialize --console 
+
+  - 记住密码 
+- mysqld --install mysql 
+- net start mysql 
+- mysql -uroot -p 
+
+  - 密码 
+- 改密码
+- ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '新密码'; 

python/util/example.c

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+// gcc -shared -fPIC -o libexample.dll example.c
+
+int add(int x,int y){
+  return x+y;
+}

python/util/example.py

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+#!/usr/bin/env  python3 
+# coding:utf-8
+from ctypes import * 
+if __name__ =='__main__':
+  lib_name ="./libexample.dll" 
+  lib= cdll.LoadLibrary(lib_name)
+  print(lib.add(c_int(10),c_int(10)));

python/util/readme.md

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+# python 调用 C语言动态库
+
+- c语言编写基本函数，打包成动态链接库
+- 依赖 ctypes 引入动态库 
+
+# c代码
+
+```c
+// example.c 
+//gcc -shared -fPIC -o libexample.dll example.c
+int add(int x,int y){
+  return x+y;
+}
+```
+
+# 编译
+
+```
+gcc -shared -fPIC -o libexample.dll example.c
+```
+
+# python 调用
+
+```python
+#!/usr/bin/env  python3 
+# coding:utf-8
+from ctypes import * 
+if __name__ =='__main__':
+  lib_name ="./libexample.dll" 
+  lib= cdll.LoadLibrary(lib_name)
+  print(lib.add(c_int(10),c_int(10)));
+```
+