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struct CRuntimeClass CObject::classCObject = { szCObject, sizeof(CObject), 0xffff, NULL, NULL };
CRuntimeClass是结构体.
classCObject是CRuntimeClass的变量.
CObject::classCObject是为类里的classCObject 变量初始化赋值
struct CRuntimeClass 前面加多这个什么意思,怎么像是在定义结构体一样.