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I was hoping that the new C++11 system_error library would provide a way to query this kind of error messages, but from what I've seen, you still have to pass errno For example, a program that processes all the lines in a file might have the following form: string str; getline(in,str); // Get the frist line from the file, if any. How to prevent Beamer from repeatedly expanding macros in \frametitle when frame-breaking Developing web applications for long lifespan (20+ years) Open hemisphere is connected more hot questions lang-cpp about us tour more hot questions question feed lang-cpp about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation

whereas in the subsequent list perror() is not contained. error state: Is a directory stream badbit. Truth in numbers Risk Management in Single engined piston aircraft flight Why is it a bad idea for management to have constant access to every employee's inbox? Your test suite tries to read from an empty file by touching some file name - you should have used /dev/null, as if the file name exists and is not empty,

The badbit is only set in case of trying to get a line from a directory. a1 aa aaa ... Escape characters must be included after each '\' in the file's path; e.g., C:\\Users\\HG\\Documents\\myFile instead of C:\Users\HG\Documents\myFile. Can Dandelion defeat you?

Congratulations! > You try to create a directory. An errno setting is sticky: it stays until the next error is happening, overwriting the state of the last error. Note I'm not at a compiler right now, so can't double check this. mode Flags describing the requested i/o mode for the file.

We have to find a way to know if there was data between the last delimiter and EOF. To read it you'd need to use the OS's primitives for reading directories - that's what "ls" is doing after all (and maybe open it in binary mode? As we can see from the data file (names) we're using: Mao Asada Carolina Kostner Ashley Wagner Gracie Gold Akiko Suzuki Kanako Murakami Adelina Sotnikova Kaetlyn Osmond Yuna Kim Julia Lipnitskaia The name of the file is a parameter to the open function.

share|improve this answer edited Jul 26 '14 at 15:48 answered Jul 26 '14 at 15:31 black 913315 add a comment| Your Answer draft saved draft discarded Sign up or log Ubuntu Logo, Ubuntu and Canonical Canonical Ltd. I hope to get a comment from you again :-) Alexandre Duret-Lutz std::getline(f, line) extracts data up to either ‘\n', or EOF, or failure. Browse other questions tagged c++ string parameters text-files or ask your own question.

We will also learn how to use the stream mechanism to read from various sources and write to various destinations, such as the user console, files, and even strings. Technically, the test consists of: The C++ source of a test program with debug output. Aug 28, 2009 at 12:10am UTC trasgu (5) Update: Writing the file's full path allows the program to open the file. An ifstream variable has an open function which can be used to open a file.

share|improve this answer edited Jun 27 '13 at 11:53 answered Jun 27 '13 at 9:02 Matthieu Rouget 2,026720 1 e.what() does not seem to give much information, see updates to Data in a file differs from data in variables because a file can exist before the program is run and can persist after the program ends. Why is the spacesuit design so strange in Sunshine? error state: Success * skip operation on data, break loop ******** testing on a /root/.bashrc (access should be denied) * trying to open and read: /root/.bashrc error state after ifstream

Suppose str is a variable of type string and you say "cin>>str" in your program. So just to be safe it might be a good idea to check for badbit also: if(errno) perror("Encountered the following error"); else if(f.bad()) cerr << "Encountered unknown error"; ackit Thank you How do I explain that this is a terrible idea? if (f.bad()) perror(("error while reading file " + filename).c_str()); f.close(); return 0; } Of course this can be run against the test shellscript from above: ./readfile_tests.sh readfile_stable_errors.cpp The output: ******** testing

In order to understand the relation between the language and operating system constructs involved, I performed quite some research and testing. How to know CPU frequency? contact us FAQ Forum Quick Links Unanswered Posts New Posts View Forum Leaders FAQ Contact an Admin Forum Community Forum Council FC Agenda Forum Governance Forum Staff Ubuntu Forums Code of Now, how does the code snippet above behave if the file path is invalid, e.g.

Alexandre Duret-Lutz The problem with the while(getline(f, line).good()) process(&line); approach is that it silently ignores the last line of a text file that is missing the final newline. Many tools (e.g., g++, diff) emit a "missing new line at EOF" warning, or process the line as if the newline was present. I copied and moved the file right into the directory of the cpp file. Why is water evaporated from the ocean not salty?

I'm having a problem with file opening. not only when badbit flag is set). Results 1 to 5 of 5 Thread: C++ ofstream::open won't accept string as a filename Thread Tools Show Printable Version Subscribe to this Thread… Display Linear Mode Switch to Hybrid Mode According to the test, one single problem may be identified via this method: a non-existing file.

error state: Is a directory * skip operation on data, break loop The test results (important things to know: part 2): There are many things to learn from this output. Note that this is a regular scenario, when the last character in a file is a line delimiter. share|improve this answer answered Apr 14 at 4:35 rthur 4141610 2 For me in MSVC 2015 that just prints iostream stream error. –RustyX Aug 11 at 11:05 add a comment| The following conclusions are only a subset.

error state: Success stream failbit (or badbit). I will update the blog post when I find the time. Thanks for commenting and sharing! It also fails if trunc is set but out is not.

Are you running from a console or debugging? Can Communism become a stable economic strategy? This succeeds: whenever there is data to extract, it is extracted. We for example expect that when fopen() returns NULL, errno is set to something meaningful.

Generate a 6 character string from a 15 character alphabet Are the properties of "element zero" feasible? If the user types "Hello,World" (with a space before the H), the computer will skip the leading space, read "Hello," into str and stop. For example, you can assign a string literal to a variable of type string. prof.

Since these file modes are part of the ios namespace, they must be explicitly addressed using that prefix as shown the table above. Topic archived. i think i should've have looked at the arguments more closely ..... –user200632 Nov 2 '09 at 17:46 I figured c_str() should work based on the compile error, but This is because the bool evaluation of the stream is sensitive to both, badbit or failbit).

The code snippet above cannot be surprised.