SYSTEMTIME、 time_t、tm 的相互转换

本文提供了将Windows的SYSTEMTIME结构与POSIX time_t类型相互转换的方法。通过两个示例函数SystemTime2Timet和Timet2SystemTime,开发者可以轻松地在不同时间表示方式间进行转换。

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SYSTEMTIME转time_t:

//SYSTEMTIME转time_t
time_t SystemTime2Timet(const SYSTEMTIME& st)
{
    struct tm gm = {st.wSecond, st.wMinute, st.wHour, st.wDay, st.wMonth-1, st.wYear-1900, st.wDayOfWeek, 0, 0};
    return mktime(&gm);
}


time_t转SYSTEMTIME:

//time_t转SYSTEMTIME
SYSTEMTIME Timet2SystemTime(const time_t& t)
{
    tm temptm = *localtime(&t);
    SYSTEMTIME st = { 1900 + temptm.tm_year
                    , 1 + temptm.tm_mon 
                    , temptm.tm_wday 
                    , temptm.tm_mday 
                    , temptm.tm_hour 
                    , temptm.tm_min 
                    , temptm.tm_sec 
                    , 0};
    return st;
}


参考:http://blog.youkuaiyun.com/c395565746c/article/details/6621153


时间函数举例程序分析 2.程序源代码: #include "stdio.h" #include "time.h" void main() { time_t lt; /*define a longint time varible*/ lt=time(NULL);/*system time and date*/ printf(ctime(<)); /*english format output*/ printf(asctime(localtime(<)));/*tranfer to tm*/ printf(asctime(gmtime(<))); /*tranfer to Greenwich time*/ } 【程序92】 题目:时间函数举例2 1.程序分析: 2.程序源代码: /*calculate time*/ #include "time.h" #include "stdio.h" main() { time_t start,end; int i; start=time(NULL); for(i=0;i<3000;i++) { printf("\1\1\1\1\1\1\1\1\1\1\n"); } end=time(NULL); printf("\1: The different is %6.3f\n",difftime(end,start)); } 【程序93】 题目:时间函数举例3 1.程序分析: 2.程序源代码: /*calculate time*/ #include "time.h" #include "stdio.h" main() { clock_t start,end; int i; double var; start=clock(); for(i=0;ii) { printf("please input a little smaller.\n"); scanf("%d",&guess); } else { printf("please input a little bigger.\n"); scanf("%d",&guess); } } end=clock(); b=time(NULL); printf("\1: It took you %6.3f seconds\n",var=(double)(end-start)/18.2); printf("\1: it took you %6.3f seconds\n\n",difftime(b,a)); if(var<15) printf("\1\1 You are very clever! \1\1\n\n"); else if(var<25) printf("\1\1 you are normal! \1\1\n\n"); else printf("\1\1 you are stupid! \1\1\n\n"); printf("\1\1 Congradulations \1\1\n\n"); printf("The number you guess is %d",i); } printf("\ndo you want to try it again?(\"yy\".or.\"n\")\n"); if((c=getch())=='y') goto loop; } 【程序95】 题目:家庭财务管理小程序 1.程序分析: 2.程序源代码: /*money management system*/ #include "stdio.h" #include "dos.h" main() { FILE *fp; struct date d; float sum,chm=0.0; int len,i,j=0; int c; char ch[4]="",ch1[16]="",chtime[12]="",chshop[16],chmoney[8]; pp: clrscr(); sum=0.0; gotoxy(1,1);printf("|----------------------------------------------------|"); gotoxy(1,2);printf("| money management system(C1.0) 2000.03 |"); gotoxy(1,3);printf("|----------------------------------------------------|"); gotoxy(1,4);printf("| -- money records -- | -- today cost list -- |"); gotoxy(1,5);printf("| ------------------------ |-----------------------------|"); gotoxy(1,6);printf("| date: -------------- | |"); gotoxy(1,7);printf("| | | | |"); gotoxy(1,8);printf("| -------------- | |"); gotoxy(1,9);printf("| thgs: ------------------ | |"); gotoxy(1,10);printf("| | | | |"); gotoxy(1,11);printf("| ------------------ | |"); gotoxy(1,12);printf("| cost: ---------- | |"); gotoxy(1,13);printf("| | | | |"); gotoxy(1,14);printf("| ---------- | |"); gotoxy(1,15);printf("| | |"); gotoxy(1,16);printf("| | |"); gotoxy(1,17);printf("| | |"); gotoxy(1,18);printf("| | |"); gotoxy(1,19);printf("| | |"); gotoxy(1,20);printf("| | |"); gotoxy(1,21);printf("| | |"); gotoxy(1,22);printf("| | |"); gotoxy(1,23);printf("|--------------------------------------------------|"); i=0; getdate(&d); sprintf(chtime,"%4d.%02d.%02d",d.da_year,d.da_mon,d.da_day); for(;;) { gotoxy(3,24);printf(" Tab __browse cost list Esc __quit"); gotoxy(13,10);printf(" "); gotoxy(13,13);printf(" "); gotoxy(13,7);printf("%s",chtime); j=18; ch[0 ]=getch(); if(ch[0]==27) break; strcpy (chshop,""); strcpy(chmoney,""); if(ch[0]==9) { mm:i=0; fp=fopen("home.dat","r+"); gotoxy(3,24);printf(" "); gotoxy(6,4);printf(" list records "); gotoxy(1,5);printf("|-------------------------------------|"); gotoxy(41,4);printf(" "); gotoxy(41,5);printf(" |"); while(fscanf(fp,"%10s%14s%f\n",chtime,chshop,&chm)!=EOF) { if(i==36) { getch(); i=0; } if ((i%36)16) { gotoxy(41,4+i-17); printf(" "); gotoxy(42,4+i-17); } i++; sum=sum+chm; printf("%10s %-14s %6.1f\n",chtime,chshop,chm);} gotoxy(1,23);printf("|----------------------------------------------|"); gotoxy(1,24);printf("| |"); gotoxy(1,25);printf("|----------------------------------------------|"); gotoxy(10,24);printf("total is %8.1f$",sum); fclose(fp); gotoxy(49,24);printf("press any key to.....");getch();goto pp; } else { while(ch[0]!='\r') { if(j15) { len=len+1; j=11; } strcpy(ch1,""); j=j-2; strncat(ch1,chtime,len); strcpy(chtime,""); strncat(chtime,ch1,len-1); gotoxy(13,7);printf(" "); } gotoxy(13,7);printf("%s",chtime);ch[0]=getch(); if(ch[0]==9) goto mm; if(ch[0]==27) exit(1); } gotoxy(3,24);printf(" "); gotoxy(13,10); j=0; ch[0]=getch(); while(ch[0]!='\r') { if (j<14) { strncat(chshop,ch,1); j++; } if(ch[0]==8) { len=strlen(chshop)-1; strcpy(ch1,""); j=j-2; strncat(ch1,chshop,len); strcpy(chshop,""); strncat(chshop,ch1,len-1); gotoxy(13,10);printf(" "); } gotoxy(13,10);printf("%s",chshop);ch[0]=getch();} gotoxy(13,13); j=0; ch[0]=getch(); while(ch[0]!='\r') { if (j='a'&&str[i]<='z') str[i]=str[i]-32; fputc(str[i],fp); i++; } fclose(fp); fp=fopen("test","r"); fgets(str,strlen(str)+1,fp); printf("%s\n",str); fclose(fp); } 【程序99】 题目:有两个磁盘文件A和B,各存放一行字母,要求把这两个文件中的信息合并(按字母顺序排列), 输出到一个新文件C中。 1.程序分析: 2.程序源代码: #include "stdio.h" main() { FILE *fp; int i,j,n,ni; char c[160],t,ch; if((fp=fopen("A","r"))==NULL) { printf("file A cannot be opened\n"); exit(0); } printf("\n A contents are :\n"); for(i=0;(ch=fgetc(fp))!=EOF;i++) { c[i]=ch; putchar(c[i]); } fclose(fp); ni=i; if((fp=fopen("B","r"))==NULL) { printf("file B cannot be opened\n"); exit(0); } printf("\n B contents are :\n"); for(i=0;(ch=fgetc(fp))!=EOF;i++) { c[i]=ch; putchar(c[i]); } fclose(fp); n=i; for(i=0;i<n;i++) for(j=i+1;jc[j]) { t=c[i];c[i]=c[j];c[j]=t; } printf("\n C file is:\n"); fp=fopen("C","w"); for(i=0;i<n;i++) { putc(c[i],fp); putchar(c[i]); } fclose(fp); } 【程序100】 题目:有五个学生,每个学生有3门课的成绩,从键盘输入以上数据(包括学生号,姓名,三门课成绩),计算出平均成绩,况原有的数据和计算出的平均分数存放在磁盘文件"stud"中。 1.程序分析: 2.程序源代码: #include "stdio.h" struct student { char num[6]; char name[8]; int score[3]; float avr; } stu[5]; main() { int i,j,sum; FILE *fp; /*input*/ for(i=0;i<5;i++) { printf("\n please input No. %d score:\n",i); printf("stuNo:"); scanf("%s",stu[i].num); printf("name:"); scanf("%s",stu[i].name); sum=0; for(j=0;j<3;j++) { printf("score %d.",j+1); scanf("%d",&stu[i].score[j]); sum+=stu[i].score[j]; } stu[i].avr=sum/3.0; } fp=fopen("stud","w"); for(i=0;i<5;i++) if(fwrite(&stu[i],sizeof(struct student),1,fp)!=1) printf("file write error\n"); fclose(fp); }
#include <iostream> #include <filesystem> #include <chrono> #include <vector> #include <algorithm> namespace fs = std::filesystem; // 将文件时间转换time_t time_t filetime_to_timet(const fs::file_time_type& ft) { using namespace std::chrono; auto sctp = time_point_cast<system_clock::duration>( ft - fs::file_time_type::clock::now() + system_clock::now() ); return system_clock::to_time_t(sctp); } // 递归搜索文件 void search_files(const fs::path& root, const std::string& extension, time_t start_time, time_t end_time, std::vector<fs::path>& results) { try { for (const auto& entry : fs::recursive_directory_iterator(root)) { if (fs::is_regular_file(entry)) { // 检查文件扩展名 std::string ext = entry.path().extension().string(); std::transform(ext.begin(), ext.end(), ext.begin(), ::tolower); // 检查时间范围 auto ftime = entry.last_write_time(); time_t crtime = filetime_to_timet(ftime); if (ext == extension && crtime >= start_time && crtime <= end_time) { results.push_back(entry.path()); } } } } catch (const fs::filesystem_error& e) { std::cerr << "文件系统错误: " << e.what() << std::endl; } } int main() { fs::path search_path = "D:/TEXT"; std::string target_ext = ".txt"; // 目标文件类型 std::vector<fs::path> found_files; // 设置时间范围(示例:2023年1月1日 - 2024年1月1日) struct std::tm start_tm = { 0 }; start_tm.tm_year = 25; // 2100-2000 start_tm.tm_mon = 5; // 6月 start_tm.tm_mday = 1; time_t start_time = std::mktime(&start_tm); struct std::tm end_tm = { 0 }; end_tm.tm_year = 25; // 2024-1900 end_tm.tm_mon = 5; end_tm.tm_mday = 2; time_t end_time = std::mktime(&end_tm); search_files(search_path, target_ext, start_time, end_time, found_files); // 输出结果 std::cout << "找到 " << found_files.size() << " 个匹配文件:\n"; for (const auto& path : found_files) { std::cout << "• " << path.string() << "\n"; } return 0; }
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06-02
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