Mega Code Archive
Another example of read() and write() and illustrates the use of gcount( )
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#include <iostream>
#include <fstream>
using namespace std;
int main()
{
double doubleNumberArray[4] = {99.75, -34.4, 1776.0, 200.1};
int i;
ofstream out("numbers", ios::out | ios::binary);
if(!out) {
cout << "Cannot open file.";
return 1;
}
out.write((char *) &doubleNumberArray, sizeof doubleNumberArray);
out.close();
for(i=0; i<4; i++) // clear array
doubleNumberArray[i] = 0.0;
ifstream in("numbers", ios::in | ios::binary);
in.read((char *) &doubleNumberArray, sizeof doubleNumberArray);
cout << in.gcount() << " bytes read\n"; // see how many bytes have been read
for(i=0; i<4; i++) // show values read from file
cout << doubleNumberArray[i] << " ";
in.close();
return 0;
}
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