fopen in C wont create file

Question

FILE * f = fopen("c:\\out.txt", "wb"); if(f == NULL) printf("ERR");

This code prints ERR. c:\out.txt does not yet exist. However if I create an empty file called out.txt and then place in the c:\ the code executes fine. How do I make c create a file if it does not exist?

Run your program as Administrator. You probably don't have permissions to create files at c:\\ — nos
– nos, Commented Dec 28, 2013 at 17:08
could you try w+ instead of wb. you could also try calling fclose. at the end of the program. — Kirill Kulakov
– Kirill Kulakov, Commented Dec 28, 2013 at 17:08
@KirillKulakov: It's not clear how either of those would help here... — Oliver Charlesworth
– Oliver Charlesworth, Commented Dec 28, 2013 at 17:14
Print out the value of errno when fopen fails to determine what the problem is. — Ferruccio
– Ferruccio, Commented Dec 28, 2013 at 17:15
You are lucky and not a danger seeker using an account with admin-rights, so you may not write to the root of your machine C-drive. Use a different path to the file you want to create. Try .\\out.txt for example. — alk
– alk, Commented Dec 28, 2013 at 17:22

chasep255 · Accepted Answer · 2013-12-28 17:21:56Z

I fixed the problem by running Netbeans with administrator privileges. This caused the exe to also be run as administrator so now I can write to c:.

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