结构 resbuf

以下结果缓冲区结构与联合一起定义，该联合支持各种 AutoCAD 和 ObjectARX 数据类型，如下所示：resbufads_u_val

union ads_u_val { 
    ads_real rreal; 
    ads_real rpoint[3]; 
    short rint; // Must be declared short, not int.  
    char *rstring; 
    long rlname[2]; 
    long rlong; 
    struct ads_binary rbinary; 
}; 
struct resbuf { 
    struct resbuf *rbnext; // Linked list pointer  
    short restype; 
    union ads_u_val resval; 
}; 

下图显示了结果缓冲区列表的示意图形式：