getenv - how to set environment variable

Question

I set environment variable this way:

export MY_DIR="$HOME/projects"

Then I want to read that variable in my program:

char *name = getenv("MY_DIR");

but I get a null value, Edit 1: when I run the program using Qt Creator.

When I compile:

g++ myprogram.cpp -o myprogram

and run:

./myprogram

the program form a terminal I get correct variable.

Could you be a bit more elaborate? Because this will code will work and is working on my machine. — Ole Gooner, Mar 31 '14 at 10:11
`export` does *not* set a variable for the whole system, although it's a common misconception among novices. — Biffen, Mar 31 '14 at 10:30
If you export your variable from one terminal and trying to get it into other terminal then it wont work instead export your variable from /etc/profile — Rahul R Dhobi, Mar 31 '14 at 10:35
You need to figure out how to set the environment for the program launched by Qt Creator. NetBeans definitely has this, QtC probably does too. — John Zwinck, Mar 31 '14 at 12:02

score 0 · Answer 1 · answered Mar 31 '14 at 13:34

At the left tab you can click at 'Projects', which will show you some options. At the "Build & Run' tab, click the 'Run' button below, then search for "Run Environment". Open it's details and there you can add or edit variables that will be available while your program is running.

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getenv - how to set environment variable

1 Answers1