Question

I’m writing a Qt app that runs in Linux. I need to write a file to:

"$XDG_CONFIG_DIRS/whatever"/ "$HOME/whatever"

How do I resolve the environment variables ## Heading ##in my code?

Answer 1

Using nothing but plain library functions, you use getenv() to look up the value of environment variables:

const char *dirs = getenv("XDK_CONFIG_DIRS");

This will return NULL if the variable was not set in the environment, so make sure your code handles this case.

You’ll have to do the “interpolation” of the variable values into the rest of the text yourself, in that case.

Not sure if Qt provides a wrapper or something more high-level that can do the interpolation for you, I haven’t worked with Qt.