C语言链表(带头节点的链表)的文件读写与销毁

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链表的写入文件

/*====================存储彩票信息========================*/
/*功能：将彩票的全部数据写入文件
*参数：彩票数据链表
*返回值：布尔类型，读出成功返回TRUE，否则返回FALSE
*/
boolean writeLotteryInfo(LOTTERY *head)
{FILE *fp;LOTTERY *current;boolean success=FALSE;current=head->next;if(current==NULL){return FALSE;}if((fp=fopen("lotteryinfo.txt","wb+"))==NULL){printf("打开文件出现错误。\n");exit(1);}while(current!=NULL){if(fwrite(current,LOT_LEN,1,fp)==1){success=TRUE;current=current->next;}}fclose(fp);return success;
}

从文件读出链表数据

/*====================读取彩票信息========================*/
/*功能：从文件里读出彩票的全部数据
*参数：彩票数据链表
*返回值：布尔类型，读出成功返回TRUE，否则返回FALSE
*/
boolean readLotteryInfo(LOTTERY *head)
{FILE *fp;LOTTERY *new_lottery,*current;boolean success=FALSE;current=head;if((fp=fopen("lotteryinfo.txt","rb+"))==NULL){printf("打开文件出现错误。\n");exit(1);}while(!feof(fp)){new_lottery=(LOTTERY *)malloc(LOT_LEN);if(new_lottery==NULL){printf("分配内存出现错误。\n");exit(1);}memset(new_lottery,'\0',LOT_LEN);if(fread(new_lottery,LOT_LEN,1,fp)==1){success=TRUE;current->next=new_lottery;current=new_lottery;}}fclose(fp);return success;
}

链表的销毁

/*====================销毁彩票信息链表====================*/
/*功能：将全部彩票的数据的链表销毁
*参数：彩票数据链表
*返回值：布尔类型，读出成功返回TRUE，否则返回FALSE
*/
boolean destroyLotteryLink(LOTTERY *head)
{LOTTERY *current;boolean success=FALSE;if(head->next==NULL){success=TRUE;}else{current=head->next;while(current!=NULL){head->next=current->next;free(current);current=NULL;current=head->next;}success=TRUE;}return success;
}

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