fread or fwrite problem....

Hi! Im a newbie here....

I got a problem with my program...My linked list is ok but everytime I export the data to the file, things don't work in a proper way..I will show my code...pls help me...thanks...

labname[20]="lab445.txt";

Code:

/****************FWRITE FUNCTION**********************/

void save_data(information *lab,char labname[])
{
   FILE *fp;
   int num;
   char temp[15];

   strcpy(temp,labname);
   temp[6]='\0';
  /* if(lab==NULL)
	{ clrscr();
	  logo();
	  gotoxy(29,10);printf("%s has an Empty List",temp);
	  gotoxy(27,14);printf("Press any key to continue..");
	} */
 
	 if((fp=fopen(labname,"wt"))==NULL)
	    { clrscr();
	      logo();
	      gotoxy(38,10);printf("Error!");
	    }
	  else
	    { 
		  if(lab==NULL)
		     putc('\0',fp);
		  else
		   {	num=0;
			   while(lab!=NULL)
				   { fwrite(lab,sizeof(information),1,fp);
					 num++;
					 lab=lab->next;
				   }
				clrscr();
				printf("There are %d copied from the list.",num);
				getch();
				clrscr();
				logo();

			  for(num=0;numnext;

						temp->next=*lab;
						*lab=temp;

					x++;
				   }
			}
		  fclose(fp);
	    clrscr();
	    printf("There are %d files copied from the file.",x);
	    getch();
	  }


}