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can, sdk_can.h , I want to know the file inside information

sdk_can.h , I want to know the  file inside information, I want use the file in CE6.

FILTER_CONFIG_TYPE、 CAN_ID CAN_STATUS、 CAN_MESSAGE.......

 what is mean?

#include "sdk_can.h"

 IOCTL_CAN_CLASS_FILTER_CONFIG_IN filterCfg;
 memset(&filterCfg,0,sizeof(filterCfg));
  filterCfg.fEnabled = TRUE;
    filterCfg.rxPriority = RXCRITICAL;
    filterCfg.classFilter.id.s_standard.id=123;
 !DeviceIoControl(m_hCan,IOCTL_CAN_FILTER_CONFIG,&filterCfg,sizeof(filterCfg),NULL,0,NULL,NULL)

fEnabled ?  rxPriority ? classFilter.id.s_standard.id ?