c question help for adv programmers

This is a discussion on c question help for adv programmers within the C Programming forums, part of the General Programming Boards category; I have a structure called EMPDATA that contains char firstname[25] and other arrays. I have defined EMPDATA target; and I ...

  1. #1
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    c question help for adv programmers

    I have a structure called EMPDATA that contains char firstname[25] and other arrays. I have defined EMPDATA target; and I have used memcpy to copy inputted data such as firstname, lastname, etc into the structure EMPDATA target; I would like to display this information in a text file of all the inputted data. How would I go about doing this?

  2. #2
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    If you want it in text format then:
    Code:
    #include <stdio.h>
    
    typedef struct {
      char name[25];
    } EMPDATA;
    
    void write(FILE *fp, EMPDATA *emp) {
      // if you want to put labels:
      fprintf(fp, "name: %s\n", emp->name);
    
      // without labels
      fputs(fp, emp->name);
    }
    
    int main() {
      EMPDATA emp;
      strcpy(emp.name, "Billy Bob");
    
      FILE *fp = fopen("output.txt", "w");
      write(fp, &emp);
      fclose(fp);
    
      return 0;
    }
    Or if you want it in binary:
    Code:
    #include <stdio.h>
    
    typedef struct {
      char name[25];
    } EMPDATA;
    
    int main() {
      EMPDATA emp;
      strcpy(emp.name, "Billy Bob");
    
      FILE *fp = fopen("output.txt", "w");
      fwrite(&emp, sizeof(EMPDATA), 1, fp);
      fclose(fp);
    
      return 0;
    }

  3. #3
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    Ok thanks, I'll play around with that when I get home...Why would you do it in binary format?

  4. #4
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    I gave you two options: text and binary. I wasn't sure how you wanted to save your data. You could've wanted it in xml or something else, haha.

    Binary format is generally more compact, not easy for users to edit, but easier to read and write. It basically dumps the whole chunk of memory into a file. Then you just use:
    Code:
    fread(&emp, sizeof(EMPDATA), 1, fp);
    ...to read it.

  5. #5
    Code Goddess Prelude's Avatar
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    >but easier to read and write
    Not if you want to do so portably. The portable functions to read and write binary files (which you have to create yourself most of the time) are long and complex enough to be a good argument in favor of text files.
    My best code is written with the delete key.

  6. #6
    /*enjoy*/
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    empdata=e
    use this code if you want
    Code:
    #include "stdio.h"
    #include "conio.h"
    
    typedef struct {
      char name[25]={'.','.','.','.','.','.','.','.,'.',.','.','.','.','.','.','.','.','.','.','.','.','.','.','.'};/* should be 25 */
    } E;
    d E;
    void main()
    {
    int j;
    for(j=0;i<25;j++)
    {if (d.name[i]=='.'){break;}
    /* (d.name[i])====> the caracter */
    /*call function of writing  a character in the file */
    /* tha's easy to do */
    }
    getch()
    }

  7. #7
    ATH0 quzah's Avatar
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    Just quit. None of your code even compiles!
    Code:
    typedef struct {
      char name[25]={'.','.','.','.','.','.','.','.,'.',.','.','.','.','.','.','.','.','.','.','.','.','.','.','.'};/* should be 25 */
    } E;
    d E;
    Wrong. It should be:
    Code:
    typedef struct {
        char name[25];
    } E;
    
    E d;
    1) You have your E after your d, which is basicly putting the name before the type.
    2) You cannot initialize portions of structures in the definition.

    Code:
    void main()
    No. Read the FAQ.

    Quzah.
    Hope is the first step on the road to disappointment.

  8. #8
    /*enjoy*/
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    sorrysorrysorrysorrysorrysorrysorrysorrysorrysorry sorrysorrysorry
    sorrysorrysorrysorrysorrysorrysorrysorrysorrysorry sorrysorrysorry
    sorrysorrysorrysorrysorrysorrysorrysorrysorrysorry sorrysorrysorry
    sorrysorrysorrysorrysorrysorrysorrysorrysorrysorry sorrysorrysorry
    sorrysorrysorrysorrysorrysorrysorrysorrysorrysorry sorrysorrysorry
    sorrysorrysorrysorrysorrysorrysorrysorrysorrysorry sorrysorrysorry
    sorrysorrysorrysorrysorrysorrysorrysorrysorrysorry sorrysorrysorry
    sorrysorrysorrysorrysorrysorry ===== > and so sorry
    Last edited by Salem; 04-28-2004 at 12:34 AM. Reason: Abuse of code tags

  9. #9
    Welcome to the real world
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    Quzah - thank you being the first person to publicly express what I've been wanting to say about enjoy's tenure here.

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