jajn HA

Important changes to forums and questions

All forums and questions are now archived. To start a new conversation or read the latest updates go to forums.mbed.com.

7 years, 4 months ago.

SD file name question

Hi,everyone. Thx for reading my question. i have a problem about SD file name. This is my SD data. /media/uploads/david8251/sd_time.png Just like picture file name is file000. and My question is how to change my file name by time. i want file000 to be year date time. Example : file000 ->201612280947 I use LPC4088 board. And this is my code below.

#include "mbed.h"
#include "SDFileSystem.h"
 
SDFileSystem sd(p5, p6, p7, p8, "sd"); // the pinout on the mbed Cool Components workshop board
Timer timer_w;

int main() { 
    int n=0;
    char filename[64];  
    timer_w.start();   
    struct tm t;
    
    t.tm_sec = 37;    // 0-59
    t.tm_min = 47;    // 0-59
    t.tm_hour = 21;   // 0-23
    t.tm_mday = 28;   // 1-31
    t.tm_mon = 11;     // 0-11
    t.tm_year = 116;  // year since 1900
    
    time_t seconds = mktime(&t);
    set_time(seconds);   
    mkdir("/sd/mydir", 0777);
    
    while(1){
        if(timer_w.read() > 2){      
            sprintf(filename, "/sd/mydir/file%03d.txt",n);  
            FILE *fp = fopen(filename, "a");  
            if(fp == NULL) {
                error("Could not open file for write\n");
            }
            fprintf(fp,"%d\r\n",1);
            fclose(fp); 
            n++;
            timer_w.reset();
        }
    }
}

Would someone can give me a hint how to do it? Thx very much!!!!

Be the first to answer this question.