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利用OPC实现VC应用程序与WinCC的数据交换(VC application with OPC data exchange with WinCC)

ree(void *p)函数是用来释放程序动态申请的内存。其参数是个指针类型。在C当中，只有当使用了动态内存申请函数malloc calloc realloc申请内存之后，才可以使用free来释放之。释放之后就不能再使用了。(ree (void* p) function is used to release the program dynamically allocated memory. Its argument is a pointer type. In C, only apply when using the dynamic memory functions malloc calloc realloc application memory before you can use free to release it. After release no longer use.)

说明：  基于Skey协议的网络通信。MD5加密算法的运用。(Network communication based on S-key protocol. Application of MD5 encryption algorithm.)

Realization of Serial Port Function and Intelligent Control of Serial Port

用C＋＋编写一个学生考试成绩信息系统，强化面向对象程序设计思想，使学生能够将C＋＋程序设计中的面向对象、重载、模板、文件等各种概念，灵活的运用到实际的程序设计中去。(Using C to prepare a student information system of examination results, and strengthen OOP thinking, so that students can be C program design in object-oriented, overloading, templates, documents such as the concept of flexible use of procedures to the actual design go.)

VC编程开发多线程端口扫描程序代码VC Programming code multi-threaded port scanner (VC Programming code multi-threaded port scanner )

完整的自助建站系统程序含建站主程序所需组件-建站complete self-help system procedures建站main program containing the necessary components

PDIUSBD12 常见问题解答(PDIUSBD12 FAQ)

51job爬虫 python写的爬虫，爬取51job前程无忧、智联招聘的大城市（北京、上海、深圳、广州、杭州）各种编程语言职位的总条数。(51job spider Python to write a crawler, climb the big city 51job qianchengwuyou, Zhaopin (Beijing, Shanghai, Shenzhen, Guangzhou, Hangzhou) a variety of programming language posts total number.)

用C语言实现Ping程序功能，是网络编程初学者学习的好例子。-C language function Ping procedures, the network programming beginners to learn the good examples.