C - Can't create a file on the current directory in OSX

Question

I have to save data in a file for a project (in C language). So i would like to use fopen to use fprintf to output my strings values on a file.

So, I do :

FILE * file; file = fopen("./tmp.txt","w+"); outputData(); //my fonction to fprintf in the file fclose(file);

But when i do that, this is not in the current directory but in my User directory of my compter (on OSX) and not on the current directory from where the app is lunch.

so, how can i change the current directory for my output file ? without hardCoding it ?

I'm executing my programme from: "/Users/Guillaume/OneDrive/Ephec/Os/Project1"

and the file tmp.txt is created in : "/Users/Guillaume" and i would like to create the file in the same directory as my project

Please show more information. Show how you run your program and show what the current directory of your terminal is when you run the program (use the shell command pwd). — Jabberwocky
– Jabberwocky, Commented Nov 7, 2019 at 10:30
I don't understand what you want to do exactly. If you want to get location to your home dir, use getenv("HOME"). To get location to your current directory, use getenv("PWD") — Mihir Luthra
– Mihir Luthra, Commented Nov 7, 2019 at 10:34
sorry for the long time between my modifications i was at my lectures — Guillaume Lemer
– Guillaume Lemer, Commented Nov 7, 2019 at 16:02
You seem to confuse the current directory (aka the working directory) and the directory where the executable resides. For the later, see this question. — AProgrammer
– AProgrammer, Commented Nov 7, 2019 at 16:06

Hugo Martin · Accepted Answer · 2019-11-07 10:30:45Z

0

You can try using full path, as on linux:

FILE * file; file = fopen("/home/toto/tmp.txt","w+");

You can also check file access using access

answered Nov 7, 2019 at 10:30

Hugo Martin

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3 Comments

Jabberwocky Over a year ago

That's not what he's asking for,

Hugo Martin Over a year ago

Yes I know, but it works by using the full path. The output file is about the compiler. You can compile it by your own instead of using the default configuration

Guillaume Lemer Over a year ago

this doesn't answer my question, i asked if is it possible to do it without full path or i miss understand what you are saying.

Guillaume Lemer · Accepted Answer · 2019-12-16 16:44:09Z

I found a solution.

char path[PATH_SIZE/2]; strcpy(path,realpath(argv[0],0));

I use the argv[0] part of my programme to get the path in conjonction with realpath()

Man page : http://manpagesfr.free.fr/man/man3/realpath.3.html

and store it in a pre-define string path

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