fopen 没有返回地址，程序崩溃

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;
}

我的结构定义是：

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;
};

当我试图获取文件名作为参数时，fopen 会返回这个

**<msvcrt!_iob+96>**

什么可能导致这个问题？

我的目标是从文件中获取数据并将其放入 2 个不同的 avltree 中，我将树保存在另一个名为 MYAPP 的结构中，以便在函数之间轻松传递。会是问题吗？

我看不到这个错误的原因。

编辑：我正在使用我自己的头文件来进行结构定义和函数。还包括：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "AVLTree.h"
#include "AVLYear.h"

谢谢。

Answer 1

您似乎正在调试器中运行该程序。当您到达fopen 语句/调用时，调试器会向您显示fopen 返回的内容。

请记住，fopen 在出错时返回零，或指向打开的文件结构的指针。因为它不返回零，所以它一定返回了一个指针。

但是您的调试器想告诉您它指向的位置，即符号msvcrt!_iob 偏移96 个字节。这似乎是一个有效的结构，iob 表示“I/O 缓冲区”之类的意思，或者 Microsoft 程序员打算使用该缩写的任何内容。

结论：没有错误。