0
typedef struct book {
char title[20];
 char author[20];
 int pages[10];

} Book;

Book b1 = {"The Zahir","Paulo Coelho",336,0};

while writing this structure into SPIFFS of ESP8266, I am using function

filename.write( (const uint8_t*)&b1, sizeof(b1));

but how can write a single data like name of book into structure of spiffs?

0
1

For this kind of situation it's best to treat your data as records in a database. To change one part of a record you read the entire record, change the value, then write that record back.

int record = 4; // which record you want to change

struct book b; // Temporary storage for editing the data

// Go to the record and read it in
filename.seek(record * sizeof(struct book));
filename.read( (const uint8_t*)&b, sizeof(struct book));

// Change the data
strcpy(b.title, "Winnie The Pooh");

// Go to the record again and write it out
filename.seek(record * sizeof(struct book));
filename.write( (const uint8_t*)&b, sizeof(struct book));
0

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.