Binaries

This is a discussion on Binaries within the C Programming forums, part of the General Programming Boards category; lets say that i have a struct Code: typedef struct record{ unsigned char *name; unsigned int race; unsigned int classs; ...

  1. #1
    Noob of C
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    Binaries

    lets say that i have a struct

    Code:
    typedef struct record{
       unsigned char *name;
       unsigned int race;
       unsigned int classs;
       unsigned int level;
       unsigned char *guild;
    }Record;
    and another struct

    Code:
    typedef struct page{
       Record *data[11];
    }Page;
    given that i've

    Code:
    fp2 = fopen(argv[2],"wb")) == NULL
    
    newPage = malloc(sizeof(Page))
    
    for(i=0 ; i < 11 ; i++){
          if((newPage->data[i] = malloc(sizeof(Record)))==NULL ){
             fprintf(stderr,"insufficient memmory");
             exit(1);
          }
       }
       
       for(i=0 ; i < 11 ; i++){
          if((newPage->data[i]->name = malloc(sizeof(char)*12))==NULL ){
             fprintf(stderr,"insufficient memmory");
             exit(1);
          }
       }
       
       for(i=0 ; i < 11 ; i++){
          if((newPage->data[i]->guild = malloc(sizeof(char)*30))==NULL ){
             fprintf(stderr,"insufficient memmory");
             exit(1);
          }
       }
    }
    
    /*added data till the page is full*/
    /*then i fwrite the page struct*/
    /*1 record is 45 bytes and there are an array of 11 records so 45*11 = 495*/
    fwrite(newPage,495,1,fp2);
    how do i fread from the binary after that

    i did something along the lines of
    Code:
       fp = fopen(argv[1],"rb")) == NULL
    
       Page *temp1;
       temp1 = malloc(sizeof(Page));
       for (i=0; i<11;i++){
          temp1->data[i]=malloc(sizeof(Record));
       }
       
       for (i=0; i<11;i++){
          temp1->data[i]->name=malloc(sizeof(char)*12);
       }
       for (i=0; i<11;i++){
          temp1->data[i]->guild=malloc(sizeof(char)*30);
       }
    
       int k;
       for(i=0;i<11;i++){
    
             printf("&#37;s",temp1->data[i]->name);
       }
    and it seg faulted
    Last edited by egoveneror2; 04-15-2008 at 12:29 AM. Reason: typo

  2. #2
    CSharpener vart's Avatar
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    fwrite(newPage,495,1,fp2);
    your memory is not continues - so you cannot do it

    your newPage pointer points to 44 bytes of continues memory (11 pointers) - it is all you can write with 1 fwrite operation

    for each malloced array - you need another fwrite

    if you want to write all the Page with childs - make the childs static arrays
    The first 90% of a project takes 90% of the time,
    the last 10% takes the other 90% of the time.

  3. #3
    Noob of C
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    i also did this sry forgot to add this in the previous post

    Code:
    newPage = malloc(sizeof(Page)))
    Last edited by egoveneror2; 04-15-2008 at 01:42 AM. Reason: typo

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