[Qt-interest] Former Console App on Windows No Longer Shows Text

[K. Frank]

Hello William!

On Thu, Jul 14, 2011 at 2:07 PM, William Gordon Rutherdale (rutherw)
<rutherw at cisco.com> wrote:
> Hi.
> ...
> It was originally a console app.  However, I needed to add a control
> button, so I added minor gui control to it.  I thus took out the 'QT -=
> gui' line from the .pro file and added some buttons.

I'm guessing, as you see, that activating the gui removes support for the
console by default.

> The old version had command-line help and other console output, e.g.
> when you run it with the -h switch.  This console output was produced
> using qDebug().
>
> The new version still does that on Linux.  However, when it runs on
> Windows the console output has disappeared.
>
> Is there any way to get it to put this output onto the console when it
> is running under Windows?

I believe you can get your console window back if you add something like:

   CONFIG += console

to your .pro file.

I don't understand exactly how this works.  (For example, you seem to be
working with the QT configuration variable, and I use the CONFIG variable.
Also, there seems to be some kind of "automatic" default behavior going
on in that leaving "gui" active turns off the console unless you explicitly
turn it back on.)

In my typical use case I launch my Qt gui applications from the command
line.  (I like to set up certain paths and other environment variables.)  In my
case, then, setting "CONFIG += console" sets up Qt console output so that
it appears in the command prompt from which I started the application.

I *think* (on windows) that if you add "CONFIG += console" to a gui project,
and then launch the application from, e.g., the start menu, Qt / windows will
automatically create a console window for you in which your console output
will appear.

Anyway, you *can* get console output with a Qt gui application on windows.
Try out the above, and if it doesn't work, post back with some more detail,
and I'll see if I can sort through what I've done and get it to work for you.

> -Will

Good luck.


K. Frank