title: Using .so file without header file
body: <p>I have a .so file, and I need to use the method in my c++ code. There is no header file. I decompile the necessary symbols by nm, and the found the method and class information are as follows. </p>
  
  <pre><code>00000000002ec9c0 B CFTDOrderField::m_Describe
  0000000000067440 W CFTDOrderField::DescribeMembers()
  </code></pre>
  
  <p>After my study, I think I should use dynamic loading solution. But I have no idea about how to define the return type of dlsym, can anyone give me some hint or solution? Thank you!!</p>