win7怎么让电脑时间与网络同步

很多情况导致电脑开机后总是从00:00开始，如主板CMOS电池供电不足。时间不对有时会导致网络浏览提示日期没有更新而不能正常访问。虽然Windows系统也有同步到internet时间的操作界面，需要多次点击。但如果是旧电脑，每次开机都要去更新这个时间，非常繁琐。所以，可以写一个自动将本地时间同步到网络时间的小程序。

1 C语言如何设置Windows平台的本地时间

1.1 C语言Windows时钟的结构体如下：

typedef struct _SYSTEMTIME {WORD wYear;/*年*/WORD wMonth; /*月*/WORD wDayOfWeek; /*星期0-60-Sunday...*/WORD wDay;/*日*/WORD wHour;/*时*/WORD wMinute;/*分*/WORD wSecond;/*秒*/WORD wMilliseconds;/*微妙*/} SYSTEMTIME, *PSYSTEMTIME;

1.2 设置本地时间的API

windows.h提供的函数SetLocalTime()可以设置本地时间。

BOOL WINAPI SetLocalTime(_In_const SYSTEMTIME *lpSystemTime);

其参数就是上述的结构体指针。

_In_在visual C++中属于SAL批注，是为了编译系统在分析代码时发现缺陷用的。表示是一个输入参数。类似的还有_Out_。

2 获取某些网站页面返回的时间字符串

如以下站点

http://quan.suning.com/getSysTime.do

页面显示：

{"sysTime2":"2022-08-10 08:40:08","sysTime1":"20220810084008"}

通过socket套接字编程即可提取到该页面返回的字符串，如：

19,36,200-0,M], cache20.cn3603[43,0]

X-Cache: MISS TCP_MISS dirn:-2:-2

X-Swift-SaveTime: Wed, 10 Aug 2022 00:50:57 GMT

X-Swift-CacheTime: 0

Timing-Allow-Origin: *

EagleId: 708422a816600926577736154e

{"sysTime2":"2022-08-10 08:50:57","sysTime1":"20220810085057"}-cache,no-store,ma

x-age=0,s-maxage=0

Access-Control-Allow-Credentials: true

es-suning-dnsstr: quan.suning.com:tradema:default

Ali-Swift-Global-Savetime: 1660092657

Via: cache46.l2cn3036[8,10,200-0,M], cache79.l2cn3036[12,0], cache3.cn3603[…

3 提取需要的字符串

4 调用SetLocalTime()设置本地时间

code demo:

#include #include #include #include #pragma comment(lib, "ws2_32.lib")/* * 国家授时中心 http://www.ntsc.ac.cn/ * 获取网络时间的网站API * 苏宁 http://quan.suning.com/getSysTime.do * 淘宝 http://api.m.taobao.com/rest/api3.do?api=mtop.common.getTimestamp * QQhttp://cgi.im.qq.com/cgi-bin/cgi_svrtime**/ｃｈａｒ* getTimeTxt(ｃｈａｒ *url);int set_local_time(const ｃｈａｒ *timeStr);int main() {ｃｈａｒ * time = getTimeTxt("quan.suning.com/getSysTime.do");if(time==NULL){printf("返回的是乱字符串！\n");printf("3秒后自动关闭窗口……");Sleep(3000);exit(1);}printf("正在应用设置...\n");//strcpy(time,"20220807174237");//printf("%s\n",time);if(set_local_time(time)==0)printf("设置时间成功！\n\n");elseprintf("设置时间失败，可能是没有权限");printf("3秒后自动关闭窗口……");Sleep(3000);//getTimeTxt("api.mmuaa.com/gettime");//getchar();return 0;}ｃｈａｒ* getTimeTxt(ｃｈａｒ *url) {WSADATA WSAData= {0};if(WSAStartup(MAKEWORD(2,2), &WSAData)) {// WSAStartupprintf("WSA 失败!\n");return false;}SOCKETsockfd;sockfd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP); // socket ｃｈａｒ myurl[BUFSIZ];strcpy(myurl, url);ｃｈａｒ *pHost = 0;ｃｈａｒ GET[BUFSIZ];for (pHost = myurl; *pHost != ‘/‘ && *pHost != ‘\0‘; ++pHost);// if ( (int)(pHost - myurl) == strlen(myurl) )strcpy(GET, "/");elsestrcpy(GET, pHost);*pHost = ‘\0‘;struct hostent *pURL;pURL = gethostbyname(myurl);struct sockaddr_in addr;addr.sin_family = AF_INET;addr.sin_addr.s_addr = *((unsigned long*)pURL->h_addr); // addr.sin_port = htons(80);connect(sockfd,(SOCKADDR *)&addr,sizeof(addr)); // connectingprintf("正在给网络API（%s）发送请求...\n",url);ｃｈａｒ header[BUFSIZ] = "";strcat(header, "GET ");strcat(header, GET);strcat(header, " HTTP/1.1\r\n");strcat(header, "HOST: ");strcat(header, myurl);strcat(header, "\r\nConnection: Close\r\n\r\n");send(sockfd, header, strlen(header), 0);// sendingprintf("正在处理请求...\n");static ｃｈａｒ text[BUFSIZ*2];while ( recv(sockfd, text, BUFSIZ, 0) > 0); // receivingclosesocket(sockfd);WSACleanup();text[BUFSIZ*2-1] = ‘\0‘;if(strlen(text) == 0)printf("text is empty!\n");elseprintf("\n网络API（%s）返回字符串：\n%s\n",url,text);ｃｈａｒ* subStr = "sysTime1";// 文本处理ｃｈａｒ* str = strstr(text,subStr);if(str == NULL)return NULL;str = str + strlen(subStr) + 3; // "sysTime1":"20220807203344//printf("abc123%s\n",str);ｃｈａｒ *time = (ｃｈａｒ*)malloc(sizeof(ｃｈａｒ)*15);strncpy(time,str,14);time[14] = ‘\0‘;printf("\n成功获得时间:%s\n",time);return time;}/* * @function : 设置Windows本地时间 * @in: timeStr - 14字节时间字符串(such as 20150415093000) * @return: 0 - success *-1 - failure **/int set_local_time(const ｃｈａｒ *timeStr){SYSTEMTIME system_time= {0};ｃｈａｒ year[4 + 1]= {0};ｃｈａｒ month[2 + 1]= {0};ｃｈａｒ day[2 + 1] = {0};ｃｈａｒ hour[2 + 1]= {0};ｃｈａｒ minute[2 + 1]= {0};ｃｈａｒ second[2 + 1]= {0};int index = 0;strncpy(year,timeStr + index, 4);index += 4;strncpy(month,timeStr + index, 2);index += 2;strncpy(day,timeStr + index, 2);index += 2;strncpy(hour,timeStr + index, 2);index += 2;strncpy(minute, timeStr + index, 2);index += 2;strncpy(second, timeStr + index, 2);index += 2;GetLocalTime(&system_time);system_time.wYear= atoi(year);system_time.wMonth= atoi(month);system_time.wDay= atoi(day);system_time.wHour= atoi(hour);system_time.wMinute = atoi(minute);system_time.wSecond = atoi(second);if (0 == SetLocalTime(&system_time))return -1;return 0;}

当然，以上小程序要手动运行才可以同步网络时间，要自动同步的话，可以通过”计划任务“自动运行。

以上代码没有考虑网络延迟的问题。在从服务器获取时间数据时，由于网络本身的不稳定性，一般会有时间上的延迟（几秒以内），这样一来，从服务器接收到的数据总早于真实时间。解决的办法是设定一个计时器，计算出本机从开始网络连接到接收完数据所耗费的时间dwDelay，然后加到 dwTime 上进行补偿。这样一来误差就可以控制在1秒以内。

以下网站返回的时间是豪秒数：

http://api.m.taobao.com/rest/api3.do?api=mtop.common.getTimestamp

页面显示：

{"api":"mtop.common.getTimestamp","v":"*","ret":["SUCCESS::接口调用成功"],"data":{"t":"1660091956996"}}

表示从1900.1.1至现在流逝的时间：

#include #include int main (){time_t timer;// typedef long time_tstruct tm y1900 = {0};double seconds;// 定义1900.1.1y1900.tm_hour= 0;y1900.tm_min= 0; y1900.tm_sec= 0;y1900.tm_year= 0; y1900.tm_mon= 0; y1900.tm_mday= 1;time(&timer);/* get current time; same as: timer = time(NULL)*/seconds = difftime(timer,mktime(&y1900));printf ("lapsed %.f seconds since January 1, y1900 to now in the current timezone", seconds);getchar();return 0;}/*output:lapsed 1660093185 seconds since January 1, y1900 to now in the current timezone*/

localtime()可转换时间格式：

#include #include // struct tm * localtime (const time_t * timer);#if 0struct tm {int tm_sec; /* seconds after the minute - [0,59] */int tm_min; /* minutes after the hour - [0,59] */int tm_hour;/* hours since midnight - [0,23] */int tm_mday;/* day of the month - [1,31] */int tm_mon; /* months since January - [0,11] */int tm_year;/* years since 1900 */int tm_wday;/* days since Sunday - [0,6] */int tm_yday;/* days since January 1 - [0,365] */int tm_isdst;/* daylight savings time flag */};#endifint main (){time_t rawtime;struct tm * timeinfo;time (&rawtime);timeinfo = localtime (&rawtime);printf ("Current local time and date: %s", asctime(timeinfo));getchar();return 0;}/*output:Current local time and date: Wed Aug 10 09:06:33 2022*/

ref

https://www.mmuaa.com/post/3281abd440aeb073.html

https://www.likecs.com/show-306240829.html

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