C : Load data from file to the linked list

Question

我编写了一个程序来创建一个简单的字典。我想将字典数据保存到文件中，当我下次运行程序时，我想将该数据加载到链接列表中。

这是我的代码:

struct node{   //structure for dictionary
    char word[20];
    char meaning[5][100]; //to store max five meanings
    struct node *next;
};

//This is how I'm saving data to the file. I guess it's working, because size of the file increases..

void WriteData(struct node *head)
{
    FILE *fp = fopen("dictionary.data", "wb");
    if(fp == NULL)
    {
        printf("Error opening file..\n");
        return;
    }
    while(head != NULL)
    {
        fwrite(head->word, sizeof(head->word), 1, fp);
        fwrite(head->meaning, sizeof(head->meaning), 1, fp);
        head = head->next;
    }
    fclose(fp);
}

但是如何读取文件并将数据加载回链表中呢？

Answer 1

您使用过 fwrite() 函数，现在使用 fread() :)这是一个伪代码。将转换为 C/C++ 和错误处理留给您。

node *head - nullptr;
node **tail = &head;
while (not end of file)
{
  *tail = allocate_and_nullify_memory();
  fread((*tail)->word, size_of_head_word, 1, fp);
  fread((*tail)->meaning, size_of_meaning, 1, fp);
  //Move the insertion point
  tail = &(*tail)->next;
}