I need some help with Binary I/O. I know how to do it when I am specifying the filename in the code
ie: fstream fio("persons.txt", ios::in | ios::out | ios::binary | ios::trunc); What I need to know is how to open or create a file with a file name that will vary and wont be persons. txt everytime. Basically, a file name specified by the user. How would I do that? I can't seem to find anything online for it. Also, please dumb it down for me, I'm still kind of new to this.

Replace "persons.txt" with a string variable containing the filename you have gotten from the user. I hope you know how to get user input...

By the way, code tags should look like this:
[code=c++] ...your code... [/code]
The fact that you tried is appreciated, however :P

You will need to use the c_str() function of the string because a lot of these function accept an array of characters, not an actual string.

#include <string>
using namespace std;

string filename = "whatever.txt";
fstream fio(filename.c_str(), ios::in | ios::out | ios::binary | ios::trunc);

Dave

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