CODEWITHSUNDEEP
c++file-handling
Sayan Pal
Sayan Pal

Reputation: 4956

Reading .raw file in C++

I am new in C++ in general, and thus, also in file handling in C++.

I need to read a .raw file which has 16-bit integers, and have dimension 512 x 512.

For that I am using following code:

ifstream myData("myData.raw");
short value;                                             
int i = 0;
char buf[sizeof(short)];
while (myData.read(buf,sizeof(buf)))
{
    memcpy(&value, buf, sizeof(value));
    cout << value << " ";
    i++;
}

cout << endl << "Total count: " << i << endl;

The value i am getting for i is not 512 x 512. So I guess something is not right.

Can someone please help me in this regard?

Upvotes: 1

Views: 10471

Answers (1)

doug
doug

Reputation: 4289

The default open mode is "text" and some characters will be possibly dropped or treated as end of file. ios::binary stops these alterations.

#include <iostream>
#include <fstream>
using namespace std;
int main() {
    ifstream myData("myData.raw", ios::binary);
    short value;
    int i = 0;
    char buf[sizeof(short)];
    while (myData.read(buf, sizeof(buf)))
    {
        memcpy(&value, buf, sizeof(value));
        cout << value << " ";
        i++;
    }

    cout << endl << "Total count: " << i << endl;
}

Upvotes: 2

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