How do I get the file size in c++?

Question

I know how to open a file, but I don't know how to get the file size to terminate a while loop that reads every single character and uses it. I tried this:

char ReadFile () {
char look ;
ifstream SLOPE_File (test.slope) ;
while (len(SLOPE_File))
{
SLOPE_File.get (look) ;
}
}

Is that correct?

Thanks!

Answer 1

Use ios_base::ate and fstream::tellg().
If you want to go back to the start of the file, use fstream::seekg(0).

Answer 2

Timon Paßlick
Thank you!

Answer 3

Timon Paßlick
Yes, in the main.cpp file. With:
using namespace std;

Answer 4

This is what I have done:

char look ;
char ReadFile (string fDir, string fName)
{
   string file = fDir + "/" + fName + ".slope" ;
  ifstream SLOPE_File (file) ;
   while (SLOPE_File.get(look) ;
}