我正在开发一个程序，需要从文件中读取数据，数据以逗号分隔。例如：姓名，姓名。我正在调试，无法解决。下面的代码正是我现在用来测试的代码。
fscanf(input, "%50[a-zA-Z], %50[a-zA-Z], %d, %d, %d, %10[a-zA-Z], %15[a-zA-Z]", newNode->lastName, newNode->firstName, &newNode->birthDay.month, &newNode->birthDay.day, &newNode->birthDay.year, newNode->major, newNode->classStand);让 newNode 完全为空，而
fscanf(input, "%50[a-zA-Z], %50[a-zA-Z], %d, %d, %d, %10[a-zA-Z], %15[a-zA-Z]", newNode->last, newNode->first, &newNode->birthDay.month, &newNode->birthDay.day, &newNode->birthDay.year, newNode->major, newNode->class);在我的测试文件上工作得很好。
我什至用与我的实际项目非常相似的代码制作了第二个文件，并且它工作得很好。另外，在损坏的文件上，如果我只是使用“%s”而不是尝试扫描集转换，它会按预期记录整行。 输入示例：
Doe,John,1,23,2000，CS-BS，初级
酒吧，Foo，4,56,2000，CS-BS，初级
这是所有文件。请原谅我的混乱，我还没有开始整理部分
函数.h
#ifndef FUNCTIONS_H
#define FUNCTIONS_H
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
typedef struct bDayType {
int month;
int day;
int year;
} bDay;
typedef struct linkList {
char lastName[50];
char firstName[50];
char major[10];
char classStand[15];
bDay birthDay;
struct linkList *next;
} node_t;
/*Parameters: input - input file containing all student info
* head - the head of the linked list
*Return: node_t* - a pointer to the list
*This function will recieve info from the input file and fill out
the linked list using
*the "add" function
*/
node_t* createList(FILE* input, node_t** head);
/*Parameters: node - node to be added to the list
* head - the head of the linked list
*Adds a node to the end of the linked list
*
*/
void add(node_t** node, node_t** head);
/*Parameters: input - the input file
*Return: node_t* - a pointer to the newly populated node
*Reads data from input and fills out nodes with the data.
*
*/
node_t* readNodeInfo(FILE* input);
/*Parameters: output - the file being written to
* head - the head of the linked list
*Prints the data to the output file, then sends a messgage to the
terminal when done
*
*/
void printList(FILE* output, node_t* head);
/*Parameters: output - the file being written to
*
*Prints 80 asterisks to the output file to seperate data entries
*
*/
void printBorder(FILE* output);
/*Parameters: head - the head of the linked list
*
*Deletes all nodes from the list to free memory
*
*/
void deleteList(node_t** head);
#endif
函数.c
#include "functions.h"
node_t* createList(FILE* input, node_t** head) {
while (!feof(input)) {
node_t* newNode = readNodeInfo(input);
if (newNode != NULL) {
add(&newNode, head);
}
}
return *head;
}
void add(node_t** node, node_t** head){
if (*head == NULL) {
*head = *node;
(*node)->next = NULL;
return;
}
node_t* temp = *head;
while (temp->next != NULL) {
temp = temp->next;
}
temp->next = *node;
(*node)->next = NULL;
}
node_t* readNodeInfo(FILE* input){
node_t* newNode = (node_t*)malloc(sizeof(node_t));
if (newNode == NULL) {
fprintf(stderr, "Error: Memory allocation failed\n");
exit(EXIT_FAILURE);
}
fscanf(input, "%50[a-zA-Z], %50[a-zA-Z], %d, %d, %d, %10[a-zA- Z], %15[a-zA-Z]",
newNode->lastName, newNode->firstName, &newNode>birthDay.month, &newNode->birthDay.day,
&newNode->birthDay.year, newNode->major, newNode->classStand);
newNode->next = NULL;
return newNode;
}
void printList(FILE* output, node_t* head){
if (head == NULL) {
fprintf(stderr, "List is empty\n");
return;
}
printBorder(output);
fprintf(output, "LIST INFO:\n");
node_t* current = head;
while (current != NULL) {
fprintf(output, "Name:\t%s %s\n", current->firstName,
current->lastName);
fprintf(output, "Date of Birth:\t%d %d, %d\n", current- >birthDay.month, current->birthDay.day, current->birthDay.year);
fprintf(output, "Major:\t%s\n", current->major);
fprintf(output, "Year:\t%s\n\n", current->classStand);
printBorder(output);
current = current->next;
}
}
void printBorder(FILE* output){
for(int i = 0; i < 80; i++){
fprintf(output, "*");
}
fprintf(output, "\n");
}
void deleteList(node_t** head){
if (*head == NULL) {
return;
}
node_t* current = *head;
node_t* next;
while (current != NULL) {
next = current-> next;
free(current);
current = next;
}
*head = NULL;
}
这是司机。c
#include "functions.h"
int main(int argc, char* argv[]) {
assert(argc == 3 && "Incorrect number of command line
arguments");
FILE* input = fopen(argv[1], "r");
assert(input != NULL && "Error opening input file");
FILE* output = fopen(argv[2], "w");
assert(output != NULL && "Error opening output file");
node_t* head = NULL;
head = createList(input, &head);
printList(output, head);
deleteList(&head);
fclose(input);
fclose(output);
return 0;
}
这是“完全”运行的测试文件：
#include <stdio.h>
#include <stdlib.h>
typedef struct bDay {
int day;
int month;
int year;
}date;
typedef struct LinkList {
date birthDay;
char last[50];
char first[50];
char major[10];
char class[15];
struct Node *next;
}Node;
Node* createNode(FILE* input, FILE* output){
Node* newNode = (Node*)malloc(sizeof(Node));
fscanf(input, "%50[a-zA-Z], %50[a-zA-Z], %d, %d, %d, %10[a-zA-Z], %15[a-zA-Z]",
newNode->last, newNode->first, &newNode->birthDay.month, &newNode->birthDay.day, &newNode->birthDay.year,
newNode->major, newNode->class);
newNode->next = NULL;
fprintf(output, "%s, %s, %d/%d/%d, %s, %s\n", newNode->first, newNode->last, newNode->birthDay.month,
newNode->birthDay.day, newNode->birthDay.year, newNode->major, newNode->class);
return newNode;
}
int main(int argc, char *argv[]) {
FILE* fp = fopen(argv[1], "r");
FILE* fp2 = fopen(argv[2], "w");
Node* newNode = createNode(fp, fp2);
// fclose(fp);
return 0;
}
您的代码中似乎存在一个小问题，可能导致它无法按预期工作。问题在于如何访问 node_t 结构中的birthDay结构的成员。
在readNodeInfo函数中，应该使用箭头运算符（->）来访问birthDay结构体的月份成员，但它被写成了（>）：
fscanf(input, "%50[a-zA-Z], %50[a-zA-Z], %d, %d, %d, %10[a-zA- Z], %15[a-zA-Z]",
newNode->lastName, newNode->firstName, &newNode>birthDay.month, &newNode->birthDay.day,
&newNode->birthDay.year, newNode->major, newNode->classStand);
修改如下：
fscanf(input, "%50[a-zA-Z], %50[a-zA-Z], %d, %d, %d, %10[a-zA- Z], %15[a-zA-Z]",
newNode->lastName, newNode->firstName, &newNode->birthDay.month, &newNode->birthDay.day,
&newNode->birthDay.year, newNode->major, newNode->classStand);