how can I save struct in file … C lang

Question

I\'d like to save a struct in a file. I\'d like to realize a function which makes this work. I tried this code but it didn\'t work.

struct utilisateur   //         


        

Answer 1

I realize this is an old post, but it comes up when people search for this information, so I'll give my own solution.

This is basically what I have used in one of my games. I actually have some extra library specific code in my own function for dialogs, but this is essentially it. I write data individually. I don't think I have a struct for this data, but there is no difference, just write your individual struct members separately. As mentioned, it's better this way.

// returns 1 if successful, 0 if not
int savemap(const char *map_name)
{
   FILE *file = NULL;

   // open the file in write binary mode
   file = fopen(map_name, "wb");

   // always check return values to see if it was opened okay
   if(file == NULL) {
      fprintf(stderr, "Error opening file for writing.\n");
      return 0;
   }

   // write file ID, version and pills
   fwrite(MAP_ID, sizeof(char), strlen(MAP_ID)+1, file);
   fwrite(&MAP_VER, sizeof(unsigned char), 1, file);
   fwrite(&pills, sizeof(unsigned short), 1, file);

   // write the map data (unsigned int map[315])
   fwrite(&map, sizeof(unsigned int), 315, file);

   // never forget to close the file
   fclose(file);

   return 1;
}