文章目录

• • @[toc]
  • 1、pycharm插件离线安装
  • 2、python实现类似C++中将结构体转为二进制的功能
  • 3、python代码将dll添加进临时环境变量

1、pycharm插件离线安装

• PyCharm Plugins and Themes | JetBrains Marketplace下载插件；

• 下载后是一个zip包；

• 打开【文件】【设置】，选中【插件】，点击设置图标，【从磁盘安装插件】；

  

2、python实现类似C++中将结构体转为二进制的功能

• 在C/C++中传递数据+中传递数据常用方式为

  struc Frame{
      int a;
      int b;
  };
  Frame frame;
  char* buf = new[sizeof(Frame)];
  memcpy(buf, &frame, sizeof(Frame));
  

• 在python中不能直接操作内存，也没有memcpy，可以使用其他方式实现类似功能；

  import numpy as np
  
  class CmdHead:
      def __init__(self):
          self.head = np.uint32(0x11223344)
          self.length = np.uint32(0)
          self.id = np.uint32(0)
  
  class CmdBody:
      def __init__(self, cmd_id=0, address=0, length=0):
          self.cmd_id = np.uint32(cmd_id)
          self.address = np.uint64(address)
          self.length = np.uint64(length)
      def toBody(self, frame_buf):
          self.cmd_id = int.from_bytes(frame_buf[0:4], "little")
          self.address = int.from_bytes(frame_buf[4:12], "little")
          self.length = int.from_bytes(frame_buf[12:20], "little")
  
  def get_cmd_id():
      # 初始化静态变量
      if not hasattr(get_cmd_id, 'count'):
          get_cmd_id.count = 0
      get_cmd_id.count += 1
      return get_cmd_id.count
  
  def build_frame(body):
      frame_len = 0
      for key, value in vars(body).items():
          if isinstance(value, np.uint32):
              frame_len += 4
          elif isinstance(value, np.uint64):
              frame_len += 8
          else:
              print("Error1:" + key)
      head = CmdHead()
      head.length = np.uint32(frame_len + 8)
      head.id = np.uint32(get_cmd_id())
  
      frame_buf = head.head.tobytes() + head.length.tobytes() + head.id.tobytes()
      # 遍历class中所有遍历，并转换为字节流
      for _, value in vars(body).items():
          if isinstance(value, np.uint32) or isinstance(value, np.uint64):
              frame_buf += value.tobytes()
          else:
              print("Error2")
  
      return frame_buf
  
  # 封装命令
  read_efuse = CmdBody(0xaa112233, 0x1000, 16)
  erase_range = CmdBody(0xaa112244, 0x2000, 100)
  buf = build_frame(read_efuse)
  print(buf.hex(" "))
  buf = build_frame(erase_range)
  print(buf.hex(" "))
  
  def frame_type(frame_buf):
      cmd_id = int.from_bytes(frame_buf[0:4], "little")
      if cmd_id == 0xaa112233:
          cmd_body = CmdBody()
          cmd_body.toBody(frame_buf)
          print(hex(cmd_body.cmd_id), hex(cmd_body.address), cmd_body.length)
      elif cmd_id == 0xaa112244:
          cmd_body = CmdBody()
          cmd_body.toBody(frame_buf)
          print(hex(cmd_body.cmd_id), hex(cmd_body.address), cmd_body.length)
      else:
          return "unknown"
  
  frame_type(buf[12:])
  

3、python代码将dll添加进临时环境变量

• 这段代码主要用于动态修改当前进程的环境变量 PATH，以便程序能够加载指定目录下的动态链接库或可执行文件；
• 修改 os.environ 仅对当前 Python 进程及其子进程有效，不会永久修改系统环境变量。

import os
def add_dll_directory(dll_path):
    """
    将DLL目录添加到环境变量中
    """
    if os.path.exists(dll_path):
        # 添加到PATH环境变量开头
        print(os.pathsep)
        os.environ['PATH'] = dll_path + os.pathsep + os.environ.get('PATH', '')
        print(f"已添加 {dll_path} 到环境变量")
    else:
        print(f"路径 {dll_path} 不存在")
add_dll_directory("./")