CODEWITHSUNDEEP
cfilestructfread
inspironman
inspironman

Reputation: 31

How can i read struct from a file?

struct Country{
    char name[50];
    float square;
    float quantityOfPeople;
};

 while (fread(&newRecord,sizeof(struct Country),1,fout)) {
        printf("hello\n");
        if (strcmp (countryName, newRecord.name) == 0) {
            printf("A record with requested name found and deleted.\n\n");
            found=1;
        } else {
            fwrite(&newRecord, sizeof(struct Country), 1, fp_tmp);
        }

    }

my file is

hjk
78.699997
799.900024

america
3432.300049
2323.199951

ghi
78.900002
89.000000

dmdmd
746234052608.000000
0.000000

In my file there is 4 records of country so it should print 4 times hellp, but it prints hello twice. The main task is to remove the duplicate entry in the file.

Upvotes: 1

Views: 63

Answers (1)

chux
chux

Reputation: 154492

fread(&newRecord,sizeof(struct Country),1,fout) is for reading binary data from a file.

OP's file is text based.

How can i read struct from a file?

Open the file in text mode.

Form a helper function that reads 4 lines with 4x fgets() and then processes the lines for 1) country name, 2) some double (see strod()) 3) another double and 4) an optional empty line.

If all these pass, save in a struct Country

Return 1 for success, 0 for failure, EOF for nothing read.

Upvotes: 1

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