如何从文件读取到c中的结构

Question

I have this struct.

Struct Wizard{
 char name[50];
 int maxHealth;
 int attackMin, attackRange;
 int curHealth, winCount;
};

And I need to make a function save the stats to a txt file.
I was given this bit of code to start it.

int saveWiz(struct Wizard * wiz)
{
  File * fp = fopen("champion.txt","w");
  char * buff = malloc(100);
  sprintf(buff,... );
  sprintf(buff,...);
  //Todo: replace ... with appropriate string, using tags like %d for variables
  fputs(buff,fp);
  fclose(fp);
}

Any help would be much appreciated. I think I am supposed to use the wiz pointer to access the struct but I'm not exactly sure.

Answer 1

I don't know if I understand exactly what you are asking but I'm guessing it's this:

You have a wiz variable of type struct Wizard * . You access the elements like this : wiz->name , wiz->maxHealth and so on, wiz->name is equivalent to (*wiz).name . So you'll have :

int saveWiz(struct Wizard * wiz)  //assuming you return 1 for success 0 for failure
{
  File * fp = fopen("champion.txt","w");
  if(!fp) {
    //file opening failed
   return 0;
}
  char * buff = malloc(200); // 200 to be sure
  if(buff) {
  sprintf(buff,"%s",wiz->name);
  sprintf(buff,"%d %d %d %d %d" , wiz->maxHealth,  wiz->attackMin,    wiz->attackRange, wiz->curHealth, wiz->winCount);
  fputs(buff,fp);
  fclose(fp);
  free(buff);
  return 1;
  }
else {
   //memory allocation failed
return 0;
}

}

Also as Martin James pointed out it is best to free dynamically allocated memory after you're done using it ( otherwise causes ugly memory leaks on long-running programs) . On that note , it's also good to check if the file opening was successful as well as the memory allocation. Also another thing I noticed is the number of elements in the buff array , 100 might not be enough ( considering an int is 32 bit (10 digits) and the name has a full 50 characters, along with the spaces it might cause an overflow).