How do you know if a C++ fstream operation failed?

say you have the following code:

Code:

---

fstream mystream;
if (mystream.is_open())
{
  mystream << 55;
  mystream.close();
}

---

How would I know if the "mystream << 55" actually worked and wrote the 55 to the file? The fstream part of C++ seems heavily documented in the usage of what you can do, but no ones seems interested in error handling.

Salem is correct of course.

Code:

---

#include <iostream>
#include <fstream>
using namespace std;

int main()
{
        fstream mystream;

        mystream.is_open();
        if (mystream.fail())
        {
                cout << "Error opening file"<<endl;

        }
        mystream << 55;
        mystream.close();
        return 0;
}

---

Actually, you want to test fail() after the write command.

Or just put the write operation in an if statement:

Code:

---

if (!(WriteFile << Something))
{
    cerr << "Failed write!\n";
}

---

Here it is again, "cerr"... Can you explain the difference between this and "cout", and if there are any like this ?

>>Here it is again, "cerr"
Click.