以常見的錢龍數據來說吧（錢龍是最簡單的存儲格式）當前價，最高價，最低價，當前成交量等等都是以隨機文件存儲的長整型數據。下面是讀取錢龍數據的C源碼，妳可以參考壹下：
#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
typedef struct { ------->定義數據類型
unsigned long date; ------->定義日期為長整
unsigned long open; ------->定義開盤為..
unsigned long high; ------->定義最高為..
unsigned long low; ------->定義最低為..
unsigned long close; ------->定義收盤為..
unsigned long travl; ------->定義成交量..
unsigned long traca; ------->定義成交額..
char unuse[12];
} RECORD;
RECORD reco;
int readrec(FILE *);
void main()
{
FILE *fp;
if((fp = fopen("000001.day","rb")) == NULL) // 打開深發展日線
{ printf("Error: Can't open 000001.DAY !\n");
exit(0); }
readrec(fp);
fclose(fp);
if(getch()==0) getch();
exit(0);
}
int readrec(FILE *fp)
{
float fn;
while (! feof(fp)) {
fread(&reco,sizeof(RECORD),1,fp);
printf("%10lu ",reco.date);
fn=float(reco.open)/1000;
printf("%8.2f ",fn);
fn=float(reco.high)/1000; .
printf("%8.2f ",fn); .
fn=float(reco.low)/1000; .
printf("%8.2f ",fn); .
fn=float(reco.close)/1000; .
printf("%8.2f ",fn); .
printf("%8lu ",reco.travl); .
printf("%8lu\n",reco.traca);
}
printf("\n");
return 0;