Binary read data to float C++

Question

I need to read into my program some data from .CSV file and I have no idea how to change this number into float. I can use only standard libraries and this file needs to be binary (ios::binary).

This is how it looks like in .csv file:

Lateral.Range(mm),5.000000

How to make this "5.000000" a float?

#include<iostream>
#include<fstream>
#include<cstring>

using namespace std;

int main()
{
    ifstream obraz;
    obraz.open("File_name.csv", ios::binary);

    if(!obraz)
        cerr<<"nie udalo sie otworzyc pliku "<<endl;

    char lat_ran[18]; // text before the number
    float lateral_range;

    obraz.read(lat_ran, sizeof(lat_ran));
    obraz.read(reinterpret_cast<float*>(&lateral_range), sizeof(float)); // I know this part is wrong.

    obraz.close();
}

Possible duplicate of [How can I read and parse CSV files in C++?](http://stackoverflow.com/questions/1120140/how-can-i-read-and-parse-csv-files-in-c) — Borgleader, Dec 23 '15 at 13:24
Of course it doesn't work, your file is in text format and you read it as raw binary. — Jabberwocky, Dec 23 '15 at 13:25

score 0 · Accepted Answer · answered Dec 23 '15 at 13:20

0

Use >> operator: obraz >> lateral_range;.

answered Dec 23 '15 at 13:20

@Artur - You might as well accept this as the answer then. Now it stays on the list as 'unanswered'. – Danny_ds Dec 27 '15 at 01:18
Oh, true. Thanks :) . I'm new here and I didn't realize that. – Artur Dec 28 '15 at 12:49

Binary read data to float C++

1 Answers1