struct Dem *F_read(void)
{
    FILE *fp;
    int i=500;
    struct Dem *q,*head,*p=NULL;
    head=(struct Dem*)malloc(sizeof(struct Dem));
    printf("读取文件...\n");
    if((fp=fopen("d:\\GTBL.dat","rt+"))!=NULL)//&&(fp2=fopen("d:\\SortGTNL1.dat","wb+"))!=NULL)
    {
        extern int n;
        printf("读取中...\n");
        while(i--)//(ch=getc(fp))!=EOF,,i--;!feof(fp)
        {   
            n=n+1;   
            q=(struct Dem*)malloc(sizeof(struct Dem));
            fread(&q->data,sizeof(UINT2),1,fp);
            fread(&q->R_num,sizeof(UINT4),1,fp);
            fread(&q->R_size,sizeof(UINT2),1,fp);
            fread(&q->R_iform,sizeof(UINT4),1,fp);
            if((MC_GET_SHORT(&q->data)-12)==0)
                q->R_name[20]='\0';
            else
                fread(q->R_name,(MC_GET_SHORT(&q->data)-12),1,fp);
            q->r_iform.Fh=(UINT1)(MC_GET_LONG(&q->R_iform)&0x0F);
            q->r_iform.Lk=((UINT1)(MC_GET_LONG(&q->R_iform)&0x70))>>4;
            q->r_iform.flag=((UINT1)(MC_GET_LONG(&q->R_iform)&0x80))>>4;
                 
        //    q->r_iform.Em=(UINT1)(MC_GET_LONG(&q->R_iform)>>8);
            if(n==1) head->next=q;
            else p->next=q;
            p=q;
            if(i<=72)
            {
                int m;
                m=ferror(fp);
                printf("%d,%d\n",m,*fp);
                printf("%d %x %d %ld %s %d %d %d\n",MC_GET_SHORT(&q->data),MC_GET_LONG(&q->R_num),MC_GET_SHORT(&q->R_size),MC_GET_LONG(&q->R_iform),q->R_name,q->r_iform.Fh,q->r_iform.Lk,q->r_iform.flag);
        //        printf("%d %d %d\n",q->r_iform.Fh,q->r_iform.Lk,q->r_iform.flag);
            }
        }
        p->next=NULL;
        fclose(fp);
        printf("文件读取成功!\n");
    }
    return(head);
}
当读到432个数据的时候fp就不动了。。。求指教 困扰我好几天了