fopen is not returning address, program crashes - c

Question

int main(int argc, char *argv[])
{
MYAPP MyApp;
MyApp = (struct MyApp*)malloc(sizeof(struct MyApp));
MyApp->maxMovieYear = 0;
MyApp->maxMovieNum = 0;
MyApp->myYearTree = CreateTreeYear();
MyApp->myTree = CreateTree();
MyApp = read_data(argv,MyApp);
int exit=FALSE;
int command;
char title[256];
int year;
int imdbID;
char posterlink[512];
printf(">>>Welcome to Movie Analysis at IMDB<<< \n");
while (!exit)
{
printf("\n-Menu-\n\
1. Display the full index of movies\n\
2. Display the movies where their title contains a specific keyword\n\
3. Display the year with maximum number of movies\n\
4. Exit\n\
Option:");
if(MyApp == NULL){
exit = TRUE;
printf("\nCannot locate the file!");
break;
}
YearWithMostMovies(MyApp->myYearTree ,MyApp);
scanf("%d", &command);
fflush(stdin);
char searchSong[512];
switch (command)
{
case 1:
printf("Movie Index\n-------------\n");
display_index(MyApp->myTree);
break;
case 2:
printf("Please enter the movie you want to see: ");
scanf("%s",searchSong);
display_movies_keyword(MyApp->myTree,searchSong);
break;
case 3:
most_popular_year_movies(MyApp);
break;
case 4:
exit = TRUE;
break;
default:
printf("command not recognized\n");
break;
}
}
printf("\n");
return 0;
}
MYAPP read_data(char *argv[],MYAPP MyApp){
FILE *outfile = fopen(argv[1],"r");
AVLTree newNode = NULL;
if(outfile == NULL)
{
printf("File does not exist...\n");
return NULL;
}
int delimiterCount = 0;
char inputData[2001];
while((fgets(inputData,2001,outfile)) != NULL)
{
int len = strlen(inputData);
if (len >= 0 && inputData[len-1] == '\n')
inputData[--len] = '\0';
AVLTree temp = NULL;
//initialize the newNode
temp = (struct tree*)malloc(sizeof(struct tree));
temp->height = 0;
temp->left = NULL;
temp->right = NULL;
char* token = strtok(inputData, ",");
strcpy(temp->title,token);
while (token != NULL)
{
token = strtok(NULL, ",");//reading the rest of the tokens with strtok
delimiterCount++;
switch (delimiterCount) // this switch orders the tokens by their places
{
case 1:
strcpy(temp->year,token);
break;
case 2:
strcpy(temp->imdbID,token);
break;
case 3:
strcpy(temp->posterlink,token);
break;
}
}
newNode = temp;
MyApp->myTree = InsertElement(newNode,MyApp->myTree);
int x = atoi(newNode->year);
MyApp->myYearTree = InsertElementYear(x,MyApp->myYearTree);
delimiterCount = 0;
}
fclose(outfile);
return MyApp;
}
My struct definitions are:
typedef struct tree * AVLTree;
typedef struct year *AVLYear;[enter image description here][1]
struct tree{
char title[512];
char posterlink[1024];
char imdbID[512];
char year[512];
struct tree* left;
struct tree* right;
int height;
};
struct MyApp{
AVLTree myTree;
AVLYear myYearTree;
int maxMovieYear;
int maxMovieNum;
};
typedef struct MyApp* MYAPP;
typedef struct year *AVLYear;
struct year
{
int year;
int num;
AVLYear left;
AVLYear right;
int height;
};
when i am trying to get filename as argument fopen returns me this
**<msvcrt!_iob+96>**
what might be causing this problem?
my aim is to get the data from a file and put it in 2 different avltree's, i keep my trees in another struct called MYAPP to pass between functions easily. can it be the problem?
i could not see the cause of this error.
Edit: i am using my own header files for struct definitions and functions. also including:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "AVLTree.h"
#include "AVLYear.h"
thanks.

Answer 1

It seems you are running the program in your debugger. When you come at the fopen statement/call, the debugger shows you what fopen returned.
remember that fopen returns zero upon error, or a pointer to an open file structure. Since it does not return zero, it must have returned a pointer.
But your debugger wants to tell you where it is pointing to, and that is to the symbol msvcrt!_iob offset with 96 bytes. The seems like a valid structure, iob meaning something like "I/O buffer", or whatever the Microsoft programmer intended for that abreviation.
Conclusion: there is no error.