我想让文本文件数据变得可读。到目前为止，我已经成功地序列化了代码，但在从文本文件中反序列化代码并在屏幕上打印数据时遇到了麻烦。
struct Node{
struct Node *next;
int c;
int d;
};
struct Node *head=NULL;
struct Node *current=NULL;
void display(){
struct Node *temp=head;
while(temp!=NULL){
printf("nData : %d", temp->c);
printf("nData : %d", temp->d);
temp=temp->next;
}
}
//Problem here
struct Node* deserialize(char* data, struct Node *p){
sscanf(data,"%d %d", &p->c, &p->d );
return p;
}
char* serialize(const struct Node *p){
char* ser = malloc(100*sizeof(*ser));
if(!ser){
printf("nUnable to allocate memory");
}else{
sprintf(ser, "%d %d",p->c, p->d);
}
return ser;
}
// and here
void readFromFile(){
char *d =malloc(100*sizeof(*d));
FILE *fp = fopen("read.txt", "r");
struct Node *f;
for(f= head; f!=NULL; f=f->next){
fscanf(fp, "%[^n]%*c", d);
// printf("nString : %s",d);
deserialize(d, f);
printf("n%d %d", f->c, f->d);
}
fclose(fp);
}
void createNode(){
struct Node *temp = NULL;
temp = (struct Node* )malloc(sizeof(struct Node));
if(temp == NULL){
printf("nttMemory for the new record cannot be allocated!!!");
return;
}
printf("nEnter number");
scanf("%d",&temp->c);
printf("nEnter number");
scanf("%d",&temp->d);
temp->next = NULL;
if(head==NULL){
head = current = temp;
}else{
current->next = temp;
current = temp;
}
printf("Record Inserted");
char* data = serialize(temp);
FILE *fp = fopen("reads.txt", "a");
fprintf(fp, "%sn",data);
fclose(fp);
free(data);
}
int main(){
int i;
for(i=0; i<3; i++){
createNode();
}
display();
readFromFile();
}
我在fscanf和sscanf部分遇到问题。我怎样才能把它做好？
struct Node* deserialize(char* data, struct Node *p){
sscanf(data,"%d %d", p->c, p->d );
return p;
}
应该是
struct Node* deserialize(char* data, struct Node *p){
sscanf(data,"%d %d", &(p->c), &(p->d) );
return p;
}
#include <stdlib.h>
#include <stdio.h>
struct Node{
struct Node *next;
int c;
int d;
};
struct Node *head=NULL;
struct Node *current=NULL;
struct Node* newNode(int c,int d){
struct Node* nd;
nd=malloc(sizeof(*nd));
nd->c=c;
nd->d=d;
nd->next=NULL;
return nd;
}
struct Node* AppendNode(struct Node*parent,struct Node* nd){
if(parent)
parent->next=nd;
return nd;
}
void display(){
struct Node *temp=head;
while(temp){
printf("Data : %d, %dn", temp->c, temp->d);
temp=temp->next;
}
}
//Problem here
struct Node* deserialize(char* data, struct Node *p){
sscanf(data,"%d %d", &p->c, &p->d );
return p;
}
char* serialize(const struct Node *p){
static char ser[100];
sprintf(ser, "%d %d",p->c, p->d);
return ser;
}
// and here
void readFromFile(const char *filename){
struct Node *f=NULL;
int c,d;
FILE *fp = fopen(filename, "r");
while(fscanf(fp, "%d %d", &c,&d)==2){
f=AppendNode(f,newNode(c,d));
if(!f){
perror("readFromFile::AppendNode()n");
exit(-1);
}
if(!head)
head=f;
}
fclose(fp);
return ;
}
void createNode(const char *filename){
struct Node *temp=newNode(0,0);
if(!temp){
perror("createNode::newNode()n");
exit(-1);
}
printf("Enter number: ");
scanf(" %d", &temp->c);
printf("Enter number: ");
scanf(" %d", &temp->d);
current=AppendNode(current,temp);
if(!head) head=current;
printf("Record Insertednn");
FILE *fp = fopen(filename, "a");
fprintf(fp, "%sn",serialize(temp));
fclose(fp);
}
void DeleteNodes(){
while(head){
current=head;
head=head->next;
free(current);
}
}
#define DATA_FILE "read.txt"
int main(){
int i;
for(i=0; i<3; i++){
createNode(DATA_FILE );
}
printf("printing entries: n");
display();
DeleteNodes();
printf("nreading from file: n");
readFromFile(DATA_FILE );
display();
DeleteNodes();
printf("nDONE: n");
return 0;
}