Foreword, I recently learned to call the medical insurance card business and use the Deka card reader, mainly to call a DLL, a dynamic library file. Take the opportunity of self-study to record all the experiences and experiences, which is convenient for interested friends to learn and discuss. The content is original, you are welcome to reprint and share, but don't forget to indicate the author and the original link when reprinting. If the content and pictures in this article violate your rights, please contact [email protected].