showcmos.c

原创于 2007-11-08 21:35:00 发布 · 387 阅读

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#byte #disk #include #types #struct #date

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本文介绍了一个简单的C语言程序，该程序通过直接访问计算机的CMOS存储区来读取当前的日期和时间，并将其打印出来。此外，还展示了如何获取硬盘类型等其他CMOS信息。

name="google_ads_frame" marginwidth="0" marginheight="0" src="http://pagead2.googlesyndication.com/pagead/ads?client=ca-pub-5572165936844014&dt=1194442938015&lmt=1194190197&format=336x280_as&output=html&correlator=1194442937843&url=file%3A%2F%2F%2FC%3A%2FDocuments%2520and%2520Settings%2Flhh1%2F%E6%A1%8C%E9%9D%A2%2FCLanguage.htm&color_bg=FFFFFF&color_text=000000&color_link=000000&color_url=FFFFFF&color_border=FFFFFF&ad_type=text&ga_vid=583001034.1194442938&ga_sid=1194442938&ga_hid=1942779085&flash=9&u_h=768&u_w=1024&u_ah=740&u_aw=1024&u_cd=32&u_tz=480&u_java=true" frameborder="0" width="336" scrolling="no" height="280" allowtransparency="allowtransparency"> #include <stdio.h>
#include <stdlib.h>
#include <dos.h>

void main(void)
{
   struct CMOS
   {
     unsigned char current_second;
     unsigned char alarm_second;
     unsigned char current_minute;
     unsigned char alarm_minute;
     unsigned char current_hour;
     unsigned char alarm_hour;
     unsigned char current_day_of_week;
     unsigned char current_day;
     unsigned char current_month;
     unsigned char current_year;
     unsigned char status_registers[4];
     unsigned char diagnostic_status;
     unsigned char shutdown_code;
     unsigned char drive_types;
     unsigned char reserved_x;
     unsigned char disk_1_type;
     unsigned char reserved;
     unsigned char equipment;
     unsigned char lo_mem_base;
     unsigned char hi_mem_base;
     unsigned char hi_exp_base;
     unsigned char lo_exp_base;
     unsigned char fdisk_0_type;
     unsigned char fdisk_1_type;
     unsigned char reserved_2[19];
     unsigned char hi_check_sum;
     unsigned char lo_check_sum;
     unsigned char lo_actual_exp;
     unsigned char hi_actual_exp;
     unsigned char century;
     unsigned char information;
     unsigned char reserved3[12];
   } cmos;

   char i;
   char *pointer;
   char byte;

pointer = (char *) &cmos;

   for (i = 0; i < 0x34; i++)
    {
      outportb(0x70, i);
      byte = inportb(0x71);
      *pointer++ = byte;
    }

   printf("Current date %d/%d/%d/n", cmos.current_month,
     cmos.current_day, cmos.current_year);
   printf("Current time %d:%d:%d/n", cmos.current_hour,
     cmos.current_minute, cmos.current_second);
   printf("Hard disk type %d/n", cmos.fdisk_0_type);
}