C 调试断言失败-未删除

我正在编写一个程序，允许用户添加一个有4个答案的问题，正确答案，日期，作者和复杂程度，该程序还具有阅读所有问题和删除问题的功能。当我选择“添加问题”选项并插入所有特征时，出现错误的消息框，它也不允许我删除或查看“`”。 问题。我需要帮助

为什么下面的代码不允许我删除问题

 void edit()
 {

    char filename[2];
    int y;
    int q,ft,s,t, fr,d,a,l,tr,n,da;
    FILE *f, *f1;

    f=fopen("pff.txt","r");
    if (f==NULL)
    {
        perror ("Error!");
    }


    fscanf(f,"%d",&y);


    printf("           " );
    gets(question.name);
    n=sizeof(question.name);

    printf("Name : ");
    gets(question.name);
    q=sizeof(question.name);

    printf("Answer 1: ");
    gets(question.first);
    ft=sizeof(question.first);

    printf("Answer 2: ");
    gets(question.second);
    s=sizeof(question.second);

    printf("Answer 3: ");
    gets(question.third);
    t=sizeof(question.third);

    printf("Answer 4: ");
    gets(question.fourth);
    fr=sizeof(question.fourth);

     printf("Right answer (1-4): ");
    scanf("%d",&question.tr);

    printf(" ");
    gets(question.date);
    da=sizeof(question.date);

    printf("Date: ");
    gets(question.date);
    d=sizeof(question.date);

    printf(" Author: ");
    gets(question.author);
    t=sizeof(question.author);

    printf("Level (0-2): ");
    scanf("%d",&question.level);
    fclose (f);

    sprintf(filename, "%d.bin", y+1);
    puts (filename);    f=fopen(filename,"wb");



    fwrite(&q,sizeof(int),1,f);
    fwrite(question.name,sizeof(question.name),1,f);
    fwrite(&ft,sizeof(int),1,f);
    fwrite(question.first,sizeof(question.first),1,f);
    fwrite(&s,sizeof(int),1,f);
    fwrite(question.second,sizeof(question.second),1,f);
    fwrite(&t,sizeof(int),1,f);
    fwrite(question.third,sizeof(question.third),1,f);
    fwrite(&fr,sizeof(int),1,f);
    fwrite(question.fourth,sizeof(question.fourth),1,f);
    fwrite (&question.tr, sizeof (int),1,f);
    fwrite(&d,sizeof(int),1,f);
    fwrite(question.date, sizeof(question.date),1,f);
    fwrite(&a,sizeof(int),1,f);
    fwrite(question.author,sizeof(question.author),1,f);
    fwrite(question.level,sizeof(int),1,f);

    fclose(f);

    f=fopen("pff.txt","w");
    fprintf(f,"%d",y+1);
    fclose(f);


 }

• 缓冲区

  filename

  太短，无法存储文件名。如果

  int

  的长度为32位，则长度应至少为16个字符
• 在不知道实际定义的情况下，写入行

  fwrite（question.level，sizeof（int），1，f）

  似乎是错误的，因为

  问题.level

  的地址使用

  %d

  说明符传递给

  scanf

  ，我猜它的类型是

  int

  。您应该包含正确的头并启用编译器警告
• 您不应将可能从

  fopen

  返回的

  NULL

  传递到

  fscanf

• 您不应该使用标准库中的

  get

  ，因为它有不可避免的缓冲区溢出风险，在C99中被弃用，在C11中被删除

尝试此操作（此处未解决使用

的问题）：

你忘了问一个问题。你需要什么帮助？帮助我认识到什么是我的错误，为什么它会失败？它以什么方式失败？你说了一些关于消息框的事情，但是消息框说什么呢？你说你不能做事，但不要告诉我们当你尝试时会发生什么。此外，没有任何东西表明您显示的代码应该做什么，因此很难判断它做错了什么。文件格式应该是什么？行？消息框显示调试断言失败表达式：（buffer！=NULL）消息框是否有
debug
按钮？如果没有，您可以在您的平台上安装调试器吗？我注意到您在检查代码时没有错误——例如，您没有检查
fopen
的返回值以查看它是否成功。加上这一点会有很大帮助。
 void edit()
 {

    char filename[32]; /* allocate enough buffer */
    int y;
    int q,ft,s,t, fr,d,a,l,tr,n,da;
    FILE *f, *f1;

    f=fopen("pff.txt","r");
    if (f==NULL)
    {
        perror ("Error!");
        return; /* avoid using NULL as file pointer */
    }


    fscanf(f,"%d",&y);


    printf("           " );
    gets(question.name);
    n=sizeof(question.name);

    printf("Name : ");
    gets(question.name);
    q=sizeof(question.name);

    printf("Answer 1: ");
    gets(question.first);
    ft=sizeof(question.first);

    printf("Answer 2: ");
    gets(question.second);
    s=sizeof(question.second);

    printf("Answer 3: ");
    gets(question.third);
    t=sizeof(question.third);

    printf("Answer 4: ");
    gets(question.fourth);
    fr=sizeof(question.fourth);

     printf("Right answer (1-4): ");
    scanf("%d",&question.tr); /* warning: don't place newline character after the number to be read here, or what is read to question.date may become not what is wanted */

    printf(" ");
    gets(question.date);
    da=sizeof(question.date);

    printf("Date: ");
    gets(question.date);
    d=sizeof(question.date);

    printf(" Author: ");
    gets(question.author);
    t=sizeof(question.author);

    printf("Level (0-2): ");
    scanf("%d",&question.level);
    fclose (f);

    sprintf(filename, "%d.bin", y+1);
    puts (filename); 
    f=fopen(filename,"wb");
    if (f == NULL) return; /* add error check */


    fwrite(&q,sizeof(int),1,f);
    fwrite(question.name,sizeof(question.name),1,f);
    fwrite(&ft,sizeof(int),1,f);
    fwrite(question.first,sizeof(question.first),1,f);
    fwrite(&s,sizeof(int),1,f);
    fwrite(question.second,sizeof(question.second),1,f);
    fwrite(&t,sizeof(int),1,f);
    fwrite(question.third,sizeof(question.third),1,f);
    fwrite(&fr,sizeof(int),1,f);
    fwrite(question.fourth,sizeof(question.fourth),1,f);
    fwrite (&question.tr, sizeof (int),1,f);
    fwrite(&d,sizeof(int),1,f);
    fwrite(question.date, sizeof(question.date),1,f);
    fwrite(&a,sizeof(int),1,f);
    fwrite(question.author,sizeof(question.author),1,f);
    fwrite(&question.level,sizeof(int),1,f); /* add & before question.level */

    fclose(f);

    f=fopen("pff.txt","w");
    if (f != NULL) { /* add error check */
        fprintf(f,"%d",y+1);
        fclose(f);
    }


 }