在编写dbc报文的协议解析时，使用位域运算和联合体的组合，能够巧妙解决字段解析问题，代码看起来整洁又健壮。

#include <algorithm>
#include <iostream>
#include <vector>

using namespace std;

typedef union tagCoreCalibrationSPCprotocol
{
    uint32_t ulData[4];
    struct
    {
        uint32_t ulData[3];
        uint32_t ulTimeStamp;
    }sTimeStamp;
    struct
    {
        uint32_t CLB_SPC_Zero_byte                     :8;
        uint32_t Reserved_1                            :24;
        uint32_t CLB_SPC_Header_CRC                    :32;
        uint32_t CLB_SPC_Protocol_Version              :8;
        uint32_t CLB_SPC_Sync_ID                       :8;
        uint32_t CLB_SPC_Status                        :2;
        uint32_t CLB_SPC_Progress                      :7;
        uint32_t CLB_SPC_Error                         :2;
        uint32_t CLB_SPC_Session_Number                :3;
        uint32_t CLB_SPC_Frame_Valid                   :1;
        uint32_t Reserved_2                            :1;
    }sMsg;
}CORE_CALIBRATION_SPC_PROTOCOL;

int main()
{
    CORE_CALIBRATION_SPC_PROTOCOL msgInfo = {0};
    msgInfo.sMsg.CLB_SPC_Protocol_Version = 64;

    return 0;
}

参考资料：

联合体、位段巧妙用法_c语言联合体和位段-CSDN博客