Thread: 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

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

i also did this sry forgot to add this in the previous post

Code:

newPage = malloc(sizeof(Page)))