#include <kernwin.hpp> // For read_selection()
#include <bytes.hpp>   // For get_many_bytes()
#include <diskio.hpp>

char buf[MAXSTR];
ea_t saddr, eaddr;

// Create the binary dump file
FILE *fp = ecreate("c:\\bindump");

// Get the address range selected, or return false if there was no selection
if (read_selection(&saddr, &eaddr))
{
    int size = eaddr - saddr;
    
    // Dump the selected address range to a binary file
    get_many_bytes(saddr, buf, size);
    ewrite(fp, buf, size);
}

eclose(fp);