This program will give you the inside view of the pointer.
以下的程序将给你展示指针的内部情况。
Called to determine the base address of a structure whose type is known when the caller has a pointer to a field inside such a structure.
调用该宏计算出已知类型、已有一个域(成员)的指针的结构体的基地址。
One will go to the contact inside the laser pointer, and the other, we'll attach to the actual housing of the laser pointer.
其中一条连接到指示器内的触点,而另一条我们会连接到指示器的外壳上。
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