Reasons why fopen fails

There should be some way to find out. Does the file exist in the execution path? You should probably be using std::cerr. The most likely cause of trouble seems to me to be that the current directory is not the debug directory of your project - so the file isn't in the current directory.

The error number should confirm that the file does not exist. Add a comment. Active Oldest Votes. Jeegar Patel Jeegar Patel Sangeeth Saravanaraj Sangeeth Saravanaraj Plus I have tried to open it without the binary mode and the result is the same. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. I don't have any answers, though, just looking for a solution.

I don't know what's different about that environment that could cause this problem there are differences. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

Create a free Team What is Teams? Learn more. Asked 12 years, 3 months ago. Active 11 years, 4 months ago. Viewed 6k times. Improve this question. Alex Reynolds Alex Reynolds 2 2 gold badges 9 9 silver badges 20 20 bronze badges. Add a comment. Active Oldest Votes. Improve this answer. Kyle Brandt Kyle Brandt Actually, errno would say too Many open files if it was the first problem, But I will leave it anyways, might be interesting to someone :- — Kyle Brandt.

Although, ulimit -n bash or getrlimit C is a bit nicer than brute-force detection of max open file-descriptors. Kjetil: Ya of course, I should have worded that better. It was meant as a proof of concept, not a tool to use :- — Kyle Brandt.

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Show older comments. HoboJoe on 1 Sep Vote 0. Commented: HoboJoe on 2 Sep Accepted Answer: Walter Roberson. Hello all,. The file names are numbers i.

Each file is about MB and contains columns of numerical data. At some point in the code there is an fopen to open and read in the relevant data from the files and this is assigned a file ID:.