typedef struct
{
uchar DC0_ALA:1; //電源0告警
uchar DC1_ALA:1; //電源1告警
uchar AC_ALA:1; //停電告警
uchar UN_H_ALA:1; //同頻信道機(jī)失鎖告警
uchar UN_L_ALA:1; //異頻信道機(jī)失鎖告警
uchar FAR_ALA:1; //遠(yuǎn)端通訊故障告警
uchar OPEN_ALA:1; //門襟告警
uchar x:1;
}ALARM;//系統(tǒng)告警結(jié)構(gòu)定義
這個結(jié)構(gòu)占一個字節(jié)寬度，其順序?yàn)椋?/p>

typedef struct
{
D0：uchar DC0_ALA:1; //電源0告警
D1：uchar DC1_ALA:1; //電源1告警
D2：uchar AC_ALA:1; //停電告警
D3：uchar UN_H_ALA:1; //同頻信道機(jī)失鎖告警
D4：uchar UN_L_ALA:1; //異頻信道機(jī)失鎖告警
D5：uchar FAR_ALA:1; //遠(yuǎn)端通訊故障告警
D6：uchar OPEN_ALA:1; //門襟告警
D7：uchar x:1;
}ALARM;//系統(tǒng)告警結(jié)構(gòu)定義

明白了嗎？