Programming

Hi

First I want to explain the scenerio :
In my project I want to control the printing of some messages. Thats why I use
#ifdef MESSAGE
------------print message--------------
#endif

And when I compile the program with -DMESSAGE option, it shows all message and without -DMESSAGE option it shows nothing. thats fine.

But this thing I want to control at run-time, mean if I execute the program like

./demo MESSAGE (it should show all the messages)
./demo (it should not show any message)

thanks

Just a thought.

Why dont you define MESSAGE in the env and make a check for it in your application using the getenv("MESSAGE") call. That should simplify things.

Just to confirm that there is absolutely no way to change the preprocessor at runtime. The preprocessor only runs once, during compile time; to change what the preprocessor sees, you must recompile.

thanks for your valuable explaination.

Now I am controlling the printing the message with normal if-else.

And one more thing : Should logging controlled with nornal if-else or preprocessor controled if-else ?

This is what we do in one of our application.

We have a config file which keeps all the user's preferences.

If there is an entry like

Code:

DEBUG=1

then in-side our code all those lines in

Code:

#ifdef DEBUG
print some debug statements 
#endif

gets printed.

vino

thanks vino.

But what I want to ask is what is the STANDARD way to do this thing?

your way or by normal if-else.

I doubt there is a standard way. You can do it the way you like.