基于Qt的Can通信代码
在基于Qt的平台下实现同CAN总线的通信，使用Qt加载动态库来实现CAN通信。周立功为CAN通信提供了动态库：官方提供了很多相关动态库和lib等。其中kerneldlls里还有很多动态库，还有一个配置文件。
如果只用到USBCAN2通信，则只需要kerneldlls里面的usbcan.dll这个动态库，里面封装了用windows和can模块通过usb通信的函数。
然后还需要ControlCAN.h这个头文件，里面有对使用dll函数时一些结构体的声明和定义。对于ControlCAN.dll和ControlCAN.lib实际上是对使用usbcan.dll动态库的引导入口。
最后使用Qt加载这些动态库来实现CAN通信，有两种方式：
(1) 显式： 通过代码加载动态库我们需要的函数，把这些函数实际放在自己的工程之中
(2) 隐式：通过在工程中加入动态库入口的路径，使可执行文件在运行时在相应路径找动态库，再使用其函数
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