多重结构体如何使用fscanf

我的初衷是将文件中的多个变量独到一个结构体数组中，但是读写没有成功，请帮忙看一下怎么回事。我的代码如下：
头文件:

typedef struct dvb_s_para

{

	unsigned int frequence;

	unsigned int symbol_rate;

	unsigned int fec_inner;

 	unsigned int power;

	unsigned int modulation_type;

}DVB_S_PARA,*PDVB_S_PARA;

typedef union tuner_setting

		{

			DVB_S_PARA       tuner_s_para;				

		}TUNER_SETTING,*PTUNER_SETTING;

cpp文件

           FILE *sfile;

	CString  str;

	TUNER_SETTING tunerpara[200]；

           int tuner_index=0;

	int k=sizeof(DVB_S_PARA);

	str.Format("%d",k);

	m_info+=str;

	UpdateData(0);

	if((sfile=fopen( "stest.txt","r" )) != NULL)	

	{

		while(!feof(sfile))

			{

                               fscanf(sfile,"%d,%d,%d,%d,%d",&(tunerpara[tuner_index].tuner_s_para.frequence),

			&(tunerpara[tuner_index].tuner_s_para.symbol_rate),

			&(tunerpara[tuner_index].tuner_s_para.fec_inner),

			&(tunerpara[tuner_index].tuner_s_para.power),

			&(tunerpara[tuner_index].tuner_s_para.modulation_type));

			fseek(sfile,20,SEEK_CUR);//经计算结构体变量大小为20字节，每次读写指针后移20

			tuner_index++;

			}

			tuner_index=0;

#if PopMessage

			FILE *fp=fopen( "test.txt","wb+");

			for(int temp=0;temp<3;temp++)

			{

				fprintf(fp,"%d,%d,%d,%d,%d",tunerpara[temp].tuner_s_para.frequence,

										tunerpara[temp].tuner_s_para.symbol_rate,

										tunerpara[temp].tuner_s_para.fec_inner,

										tunerpara[temp].tuner_s_para.power,

										tunerpara[temp].tuner_s_para.modulation_type);

			}

			fclose(fp);

			

			

#endif

		}