go wrapper for snap7.
base on snap7-full-1.4.2.
snap7-go's Introduction
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lei-jpgsnap7-go's Issues
不能在c语言的header文件中使用变量定义
snap7.h中定义了很多的常量没有使用，这样两个文件引入的话就会出现重复定义的变量名。
这个看起来是个顶级错误，but why？
bit只能一次传输一个数据？？？？
if ((Job.WordLen==S7WLBit) && (Job.Amount>1))
return errCliInvalidTransportSize;
s7_micro_client.cpp的方法opReadArea
c调用go语言实现的回调函数，如果函数原型有个指针呢??
func GlobalReadEventsCallback(usrPtr *C.void, event C.PSrvEvent, size C.int) {
}
event是一个指针，如果直接转化为一个go语言指针，这样看起来很危险，
go语言的运行时是否会认为这样的指针也尝试去释放呢？
实际上这个指针是c语言分配的。
所以我认为正确的做法是，在go语言里重新构造，只是使用他的数据
panic: runtime error: cgo argument has Go pointer to Go pointer [recovered] ?
panic: runtime error: cgo argument has Go pointer to Go pointer
ReadSZL????????
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