C链表使用fread和fwrite写入文件和从文件读出

C链表使用fread和fwrite写入文件和从文件读出

具体代码如下

//结构类型
typedef struct Lnode {
	ElemType data;
	struct Lnode *next;
}Lnode, *Linknode;

//写文件的方法
status SaveList(Linknode &L)
{
	FILE  *fp;  char filename[30];  int i;
	printf("input file name: ");
	scanf("%s", filename);
	if ((fp = fopen(filename, "wb")) == NULL)
	{
		printf("File open error\n ");
		return 1;
	}
	Linknode head=NULL;
	head = L->next;
	while (head)
	{
		fwrite(&head->data,sizeof(ElemType), 1, fp);
		head = head->next;
	}
	fclose(fp);
	return OK;
}

//读文件的方法
status LoadList(Linknode &L)
{
	FILE  *fp;  char filename[30]; 
	int temp;
	Linknode pHead=NULL;
	printf("input file name: ");
	scanf("%s", filename);

	if ((fp = fopen(filename, "rb")) == NULL)
	{
		printf("File open error\n ");
		return 1;
	}
	Linknode tail=L;
	while (fread(&temp, sizeof(ElemType), 1, fp))//每次读出一个Elemtype 型的temp通过尾插法创建链表
	{
		Linknode node = (Linknode)malloc(sizeof(Lnode));
		node->data = temp;
		tail->next = node;
		tail = node;
		tail->next = NULL;
	}
	fclose(fp);
	return OK;
}