Date on Filename

**zyberb** · 05-06-2010

Helo!
Does anyone know how i put date on filenames.Now i use this code to create a new file:

FILE *fil1,*fil2;
fil1=fopen("sample.txt","w");

i know that time.h has the date,but how do i put this date in the filename?

Thanks!

**Kennedy** · 05-06-2010

You cannot do it the way you have up there. . . it is more along these lines:

Code:

char filename[1024];

sprintf(filename, "sample-%i%02i%02i.txt", date.year, date.month, date.day);

fil1 = fopen(filename, "w");

**zyberb** · 05-06-2010

Originally Posted by Kennedy

You cannot do it the way you have up there. . . it is more along these lines:

Code:

char filename[1024];

sprintf(filename, "sample-%i%02i%02i.txt", date.year, date.month, date.day);

fil1 = fopen(filename, "w");

I tried it didn't work i just got some random numbers behind the name,maybe the adress? Here is my code by the way.

Code:

#include <stdio.h>
#include <windows.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>



 int main(void)
 {
    int teller=0;
    int i=0;
    char szBuff[100+1] ={0};
    DWORD dwBytesRead = 0;
    char dateStr [9];
    char timeStr [9];
    int verdi;
     int len;
    _strdate( dateStr);
    _strtime( timeStr );






    //initsialisering av filer

    FILE *fil1,*fil2;
    fil1=fopen("sample.txt","w");
    fil2=fopen("sample2.csv", "w");



        //denne første delen inneholder kode for å åpne den serielle porten

     HANDLE hSerial;                          // oppretter et HANDLE objekt.Handle er en identifikatorer for objektene kernel er ansvarlig for

    hSerial = CreateFile("COM1",             // hSerial som er av typen HANDLE filnavnet"com1"
    GENERIC_READ | GENERIC_WRITE,            //deklarerer om man ønsker å lese fra eller til den seriell porten
    0,                                       //skal altid være 0
    0,
    OPEN_EXISTING,                           // forteller at windows bare skal åpne en eksisterende fil.i vårt tilfelle eksisterer com porten
    FILE_ATTRIBUTE_NORMAL,
    0);

    // Her skjekkes om porten eksisterer
    if(hSerial==INVALID_HANDLE_VALUE){
        if(GetLastError()==ERROR_FILE_NOT_FOUND){
            printf("Port finnes ikke");      //serial port does not exist. Inform user.

        }
        printf("Ukjent feil");
                                            //some other error occurred. Inform user.
    }


   /*Her settes egenskapene til den serielle porten baud rate, (stop bits, etc)
    DCB struct definerer egenskapene for en seriell kommunikasjon i windows http://msdn.microsoft.com/en-us/library/aa363214(VS.85).aspx
   */
    DCB dcbSerialParams = {0};              //setter alle felt til 0
    dcbSerialParams.DCBlength=sizeof(dcbSerialParams);  //

    if (!GetCommState(hSerial, &dcbSerialParams)) {     //tar Handlen vi opprettet og DCB struct til å fylle de parametrene som er i bruk nå i porten
        printf("error getting state");
    //error getting state
    }

    //trenger da bare å sette de parametrene vi har bruk for
    dcbSerialParams.BaudRate=CBR_19200;
    dcbSerialParams.ByteSize=8;
    dcbSerialParams.StopBits=ONESTOPBIT;
    dcbSerialParams.Parity=NOPARITY;

    if(!SetCommState(hSerial, &dcbSerialParams)){
        printf("error setting state");
    //error setting serial port state
    }

    /*Setting timeouts: Dersom det ikke kommer noen data inn på den serielle porten
    og man prøver å lese fra den kan aplikasjonen låse seg mens den venter på data.
    Enkleste måten er å sette en ventetid
    *ReadIntervalTimeout:Hvor lenge i millisekund det skal ventes mellom vær karakter
    *ReadTotalTimeoutant:ventetid før returnering
    *ReadTotalTimeoutMultiplier: Spesifiserer ventetid før returnering for hver byte som skulle lese
    *WriteTotalTimeoutConstant og WriteTotalTimeoutMultiplier: leser
    */
    COMMTIMEOUTS timeouts={0};
    timeouts.ReadIntervalTimeout=50;
    timeouts.ReadTotalTimeoutConstant=50;
    timeouts.ReadTotalTimeoutMultiplier=10;

    timeouts.WriteTotalTimeoutConstant=50;
    timeouts.WriteTotalTimeoutMultiplier=10;
    if(!SetCommTimeouts(hSerial, &timeouts)){
    //error occureed. Inform user
    }

    // lesing og skriving av data

    fprintf(fil1,"vannivået er:\n");

      while(1){

        if(!ReadFile(hSerial,szBuff,100, &dwBytesRead, NULL)){
                printf("ikke motatt");
        //error occurred. Report to user.
        }




        verdi=atoi(szBuff);
        len = strlen(szBuff);

        if(len==3){

            printf(szBuff);
            printf("\n");

            if(verdi<209){
                printf("tank tom");
                  verdi=0;

                  fprintf(fil1,"%dcm",verdi);
                  fprintf(fil1,"                      %s,", dateStr);
                  fprintf(fil1,"%s\n", timeStr);

                  fprintf(fil2,"%d",verdi);
                  fprintf(fil2,"\n");
                  fprintf(fil1,"\n");
            }

            if((verdi>=212) && (verdi<=222)){

                    verdi=5;
                  printf("5cm");
                  fprintf(fil1,"%dcm",verdi);
                  fprintf(fil1,"                      %s,", dateStr);
                  fprintf(fil1,"%s\n", timeStr);

                  fprintf(fil2,"%d",verdi);
                  fprintf(fil2,"\n");
                  fprintf(fil1,"\n");

            }

             if((verdi>=232) && (verdi<=242)){
                    verdi=10;
                    printf("10cm");
                  fprintf(fil1,"%dcm",verdi);
                  fprintf(fil1,"                      %s,", dateStr);
                  fprintf(fil1,"%s\n", timeStr);

                  fprintf(fil2,"%d",verdi);
                  fprintf(fil2,"\n");
                  fprintf(fil1,"\n");


            }


            if((verdi>=248) && (verdi<=265)){
                    verdi=15;
                    printf("15cm");
                  fprintf(fil1,"%dcm",verdi);
                  fprintf(fil1,"                      %s,", dateStr);
                  fprintf(fil1,"%s\n", timeStr);

                  fprintf(fil2,"%d",verdi);
                  fprintf(fil2,"\n");
                  fprintf(fil1,"\n");


            }

            if((verdi>=273) && (verdi<=283)){
                    verdi=20;
                    printf("20cm");
                  fprintf(fil1,"%dcm",verdi);
                  fprintf(fil1,"                      %s,", dateStr);
                  fprintf(fil1,"%s\n", timeStr);

                  fprintf(fil2,"%d",verdi);
                  fprintf(fil2,"\n");
                  fprintf(fil1,"\n");

            }

             if((verdi>=294) && (verdi<=304)){
                    verdi=25;
                    printf("25cm");
                  fprintf(fil1,"%dcm",verdi);
                  fprintf(fil1,"                      %s,", dateStr);
                  fprintf(fil1,"%s\n", timeStr);

                  fprintf(fil2,"%d",verdi);
                  fprintf(fil2,"\n");
                  fprintf(fil1,"\n");


            }



            if((verdi>=312) && (verdi<=322)){
                    verdi=30;
                    printf("30cm");
                  fprintf(fil1,"%dcm",verdi);
                  fprintf(fil1,"                      %s,", dateStr);
                  fprintf(fil1,"%s\n", timeStr);

                  fprintf(fil2,"%d",verdi);
                  fprintf(fil2,"\n");
                  fprintf(fil1,"\n");


            }

             if((verdi>=337) && (verdi<=347)){
                    verdi=35;
                    printf("35cm");
                  fprintf(fil1,"%dcm",verdi);
                  fprintf(fil1,"                      %s,", dateStr);
                  fprintf(fil1,"%s\n", timeStr);

                  fprintf(fil2,"%d",verdi);
                  fprintf(fil2,"\n");
                  fprintf(fil1,"\n");


            }


            if((verdi>=355) && (verdi<=365)){
                    verdi=40;
                    printf("40cm");
                  fprintf(fil1,"%dcm",verdi);
                  fprintf(fil1,"                      %s,", dateStr);
                  fprintf(fil1,"%s\n", timeStr);

                  fprintf(fil2,"%d",verdi);
                  fprintf(fil2,"\n");
                  fprintf(fil1,"\n");


            }

             if((verdi>=373) && (verdi<=383)){
                    verdi=45;
                    printf("45cm");
                  fprintf(fil1,"%dcm",verdi);
                  fprintf(fil1,"                      %s,", dateStr);
                  fprintf(fil1,"%s\n", timeStr);

                  fprintf(fil2,"%d",verdi);
                  fprintf(fil2,"\n");
                  fprintf(fil1,"\n");

            }


            if((verdi>=394) && (verdi<=404)){
                    verdi=50;
                    printf("50cm");
                  fprintf(fil1,"%dcm",verdi);
                  fprintf(fil1,"                      %s,", dateStr);
                  fprintf(fil1,"%s\n", timeStr);

                  fprintf(fil2,"%d",verdi);
                  fprintf(fil2,"\n");
                  fprintf(fil1,"\n");

            }

             if((verdi>=416) && (verdi<=426)){
                    verdi=55;
                    printf("55cm");
                 fprintf(fil1,"%dcm",verdi);
                  fprintf(fil1,"                      %s,", dateStr);
                  fprintf(fil1,"%s\n", timeStr);

                  fprintf(fil2,"%d",verdi);
                  fprintf(fil2,"\n");
                  fprintf(fil1,"\n");

            }

            if((verdi>=437) && (verdi<=447)){
                    verdi=60;
                    printf("60cm");
                  fprintf(fil1,"%dcm",verdi);
                  fprintf(fil1,"                      %s,", dateStr);
                  fprintf(fil1,"%s\n", timeStr);

                  fprintf(fil2,"%d",verdi);
                  fprintf(fil2,"\n");
                  fprintf(fil1,"\n");

            }

             if((verdi>=457) && (verdi<=467)){
                    verdi=65;
                    printf("65cm");
                 fprintf(fil1,"%dcm",verdi);
                  fprintf(fil1,"                      %s,", dateStr);
                  fprintf(fil1,"%s\n", timeStr);

                  fprintf(fil2,"%d",verdi);
                  fprintf(fil2,"\n");
                  fprintf(fil1,"\n");


            }

             if((verdi>=478) && (verdi<=488)){
                    verdi=70;
                    printf("70cm");
                 fprintf(fil1,"%dcm",verdi);
                  fprintf(fil1,"                      %s,", dateStr);
                  fprintf(fil1,"%s\n", timeStr);

                  fprintf(fil2,"%d",verdi);
                  fprintf(fil2,"\n");
                  fprintf(fil1,"\n");


            }
        printf("\n");
        teller++;
        }




       }
        fclose(fil1);
         fclose(fil2);


    // NB viktig å lukke Handlen vi opprettet etter bruk
    CloseHandle(hSerial);


    char lastError[1024];
    FormatMessage(
    FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
    NULL,
    GetLastError(),
    MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
    lastError,
    1024,
    NULL);


}

**Kennedy** · 05-06-2010

Um, that was not _real_ code from my post.

1) get the date (in whatever format) and verify that you get the date via printing the date to the screen.

2) parse the date (if necessary) -- or ask for the date in a structure.

3) Now you know where to access year, month, and day. SO, then you do this:

Code:

char filename[1024];
sprintf(filename, "%s-%i%02i%02i%s",<filename start>, <year>, <month>, <day>, <any extension you want>);
file = fopen(filename, "w");

**dwks** · 05-06-2010

A good place to start looking for time and date information is something like this: ctime (time.h) - C++ Reference

Also, that code looks highly repetitive. You can almost certainly make it easier to read and understand by breaking out some of the code into functions or performing some calculations.

Food for thought: you could create an array holding the boundary values, like

Code:

const int boundary[] = {
    209, 212, 222, 242, 265, /* ... */
};

Then you could check which index the verdi falls into -- say it's index x, that means you need to print x*5 cm (just handle zero as a special case). If you do something like that then your code will be much more compact.

[I'm assuming here that you wanted to partition the integers into these separate ranges -- if there are some numbers you don't want to deal with at all, then you can handle that as well.]

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