Question

I need to split a file into multiple files without compression. I found this on cpp reference

#include <fstream>
using namespace std;

int main () {

char * buffer;
long size;

ifstream infile ("test.txt",ifstream::binary);
ofstream outfile ("new.txt",ofstream::binary);

// get size of file
infile.seekg(0,ifstream::end);
size=infile.tellg();
infile.seekg(0);

// allocate memory for file content
buffer = new char [size];

// read content of infile
infile.read (buffer,size);

// write to outfile
outfile.write (buffer,size);

// release dynamically-allocated memory
delete[] buffer;

outfile.close();
infile.close();
return 0;
}

and I thought to do it like this. But the problem is ..I can create only the 1st file because I can read data only from the beginning of the file. Can it be done like this and if no..what is the best way to split these files.

Answer 1

You can seek the stream to the desired position and then read stream. Check this piece of code.

// get size of file
infile.seekg(0,ifstream::end);
size=infile.tellg();
infile.seekg(0);

All you need to do is to remember the position where you stopped reading infile, close outfile, open new outfile, reallocate buffers and read infile to buffer and write to second outfile.