求助 C語言關於開啟資料夾 讀取和儲存
我的編程出現錯誤 在case '4 ' 和 case '5 ' 這兩個地方
case '4 '是儲存檔案在資料夾 case '5 '是讀取檔案從資料夾
不知道哪位高手幫幫忙
謝謝
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "linkedlist.h "
int main(int argc, char *argv[])
{
int i;
struct Info info;
char selection;
FILE *fptr;
int size;
printf( "Welcome to the storage room.\n\n ");
do
{
printf( "Please select an option that you wish. ");
printf( "\n*************************************\n ");
printf( "Press 1 to add a record.\n ");
printf( "Press 2 to delete a record.\n ");
printf( "Press 3 to view all records.\n ");
printf( "Press 4 to saving records to a disk file.\n ");
printf( "Press 5 to restoring records from a disk file.\n ");
printf( "Press 'ESC ' to exit. ");
printf( "\n*************************************\n ");
printf( "\n ");
selection = getch();
switch( selection )
{
case '1 ':
if (isEmptyList())
{
printf( "The list is empty.\n ");
}
for (i=0; i <50; i++)
{
printf( "record number: ");
scanf( " %d ", &info.record);
printf( "Name of compenent type: ");
fflush(stdin);
gets(info.type);
printf( "The value of component: ");
fflush(stdin);
gets(info.value);
printf( "How many in the stock: ");
scanf( " %d ", &info.number);
insertNode(&info);
}
break;
case '2 ':
if (isEmptyList())
{
printf( "The list is empty.\n ");
}
while(traversalList());
deleteNode();
break;
case '3 ':
if (isEmptyList())
{
printf( "The list is empty.\n ");
break;
}
rewindList();
do
{
retrieveNode(&info);
printf( "record number\t%d\n ", info.record);
printf( "compenent type:\t%s\n ", info.type);
printf( "component value:\t%s\n ", info.value);
printf( "stock:\t%3d\n ", info.number);
} while (traversalList());
break;
case '4 '
fptr = fopen( "comp.dat ", "wb ");//open the file for writing
while(!isEmptyList())
{
rewindList();
retrieveNode(&info);
fwrite(&info,sizeof(info),1, fptr);
deleteNode();
}
fclose(fptr);
break;
case '5 '
fptr = fopen( "MyData.dat ", "rb "); //open the file for
reading
//read from the file
while(1)
{
size = fread(&info,sizeof(info),1,fptr);
if (size <= 0)
{
break;
}
insertNode(&info);
fclose(fptr);
case 27:
printf( "Bye.\n\n ");
break;
default:
printf( "Your selection is not valid.\n ");
printf( "Please try again\n ");
printf( "\n ");
break;
}
}while (selection != 27);
system( "PAUSE ");
return 0;
}
以下是linkedlist.c 的部分(應該是沒錯)
#include <stdio.h>
#include <stdlib.h>
#include "linkedlist.h "
//internal function prototypes
void insert();
void create();
void assign(struct Info *info);
struct Node *head=NULL, *current=NULL, *temp=NULL;
int isEmptyList()
{
return (head==NULL);
}
void rewindList()
{
current = head;
}
int traversalList()
{
if (current==NULL) return 0;
if (current-> link==NULL) return 0;
current = current-> link;
return 1;
}
void insert()
{
if (head == NULL)
{
head = temp;
current = head;
}
else
{
temp-> link = current-> link;
current-> link = temp;
current = current-> link;
}
}
void deleteNode()
{
if (head==NULL) return;
if (current==head)
{
head = current-> link;
free(current);
current = head;
}
else
{
temp = head;
while(1)
{
if (temp-> link==current) break;
temp = temp-> link;
}
temp-> link = current-> link;
free(current);
current = temp-> link;
if (current==NULL) current = head;
}
}
void create()
{
temp = (struct Node *)malloc(sizeof(struct Node));
temp-> link = NULL;
}
void assign(struct Info *info)
{
if (temp==NULL) return;
memcpy(&temp-> info,info,sizeof(struct Info));
}
void retrieveNode(struct Info *info)
{
if (head==NULL || current==NULL) return;
memcpy(info,¤t-> info,sizeof(struct Info));
}
void insertNode(struct Info *info)
{
create();
assign(info);
insert();
}
以下是linkedlist.h 的部分(應該是沒錯)
#ifndef LINKEDLIST_H
#define LINKEDLIST_H
//declare struct for data
struct Info
{
int number;
int record;
char type[25];
char value[25];
};
struct Node
{
struct Info info;
struct Node *link;
};
//function prototypes
int isEmptyList();
void rewindList();
int traversalList();
void insertNode(struct Info *info);
void deleteNode();
void retrieveNode(struct Info *info);
#endif
[解决办法]
3
case '5 ':
fptr = fopen( "MyData.dat ", "rb "); //open the file for reading
//read from the file
while(1)
{
size = fread(&info,sizeof(info),1,fptr);
if (size <= 0)
{
break;
}
insertNode(&info);
} //!! while 应该是到这里吧？少了大括号
fclose(fptr);
break; //break 跳出该 case分支
case 27:
printf( "Bye.\n\n ");
break;
