方法1：

char* opentag="HV2003_O"; //定义变量类型，连接变量
char* closetag="HV2003_C";
BOOL open,close;
open = GetTagBit(opentag);
close = GetTagBit(closetag);
if (open&!close) // ！取反 &与 或
return CO_GREEN; //变绿
if (!open&close)
return CO_RED; //变红
if (!open&!close)
return CO_WHITE; //变白
if (open&close)
return CO_YELLOW; //变黄