c++ - Reading structures from a binary file -

i'm having troubles loading data file. i've put cout<<"entered while loop" when reading , keeps repeating until crashing, not showing data of file.

this part of code find relevant question, if needed i'll provide more informations:

    struct book {     char name[50];     int bookid; };  struct writter {     char name[30];     int writterid,         bookamount;     struct book book[20]; };  struct publisher {     char name[20];     int publisherid,         qtautor;     writter writter[30]; };  publisher publisher[20];      void savingdata(){                 fflush(stdin);                 if((arquivo = fopen("contact.dat","wb+")) !=null){                         cout<<"it enters write part"<<endl;//just checking if enters write part                         fwrite(&publisher,sizeof(publisher),1,arquivo);                         fclose(arquivo);                 }                  else{                     cout<<"error: file cannot opened";                 } }//savingdata  void loadingdata(){             fflush(stdin);              if((arquivo = fopen("contact.dat","rb+")) !=null){                 while(!feof(arquivo)){                     fread(&publisher,sizeof(publisher),1,arquivo);                     if(!feof(arquivo)){                     cout<<"entered while loop";                     }//if                  }//while fclose(arquivo);             }//if              else{                 cout<<"error: file cannot opened";                 }  } 

i hope didn't forget translate anything.

edit: did sam varshavchik , took fclose out. appears 1 time entered, information on file still not loaded. on file have 1 publisher, 1 writter , 2 books. write names on structs, else added increment. this print of file:

fclose(arquivo); 

on first iteration of while loop, file closed. once it's closed, file no longer valid. next thing happen is:

while(!feof(arquivo)){ 

... try check file status again, check if iteration of loop should happen. file no longer valid; hence undefined behavior.

your bug code continues use file, after closed. once call fclose, it's game over. can't touch file object, or refer it, in way. gone. ceased exist. no more. joined choir-invisible. it's ex-file.