[Moved] QT and data input in ubuntu terminal

denya

When I start a simple program that needs to input data in terminal (Ubuntu) - I cant do it. In the console window i can input everything but the programm doesnt respond.
Please tell me what is wrong?

goetz

Probably your code is wrong.

Sorry, that's much too less information to give you a reasonable answer. You can provide us the source code for a

short
complete
compilable
runnable

program that demonstrates us the problem and we'll have a look.

denya

Here is the code:

@
#include <iostream>
using namespace std;
#include <cctype>

int fuct (int);

int main()
{
int n;

    cout << "Input number: ";
    while (cin >> n)
    {
            int fk = fuct (n);
            cout << "\nFactorial: " << fk << "\n";
            cout << "Input number: ";
    }

    return 0;

}

int fuct (int n)
{
if (n == 0) return 1;
else if (n == 1) return 1;
else return n * fuct(n-1);
}
@

[EDIT: code formatting, please use @-tags, Volker]

tobias.hunger

How does this code relate to Qt?

denya

Sorry, the code was displayed wrong in the previous post:

@
#include <iostream>
using namespace std;
#include <cctype>

int fuct (int);

int main()
{
int n;

    cout << "Input number: ";
    while (cin >> n)
    {
            int fk = fuct (n);
            cout << "\nFactorial: " << fk << "\n";
            cout << "Input number: ";
    }

    return 0;

}

int fuct (int n)
{
if (n == 0) return 1;
else if (n == 1) return 1;
else return n * fuct(n-1);
}
@

[EDIT: code formatting, Volker]

denya

so, if it has not relation to Qt it will not work properly?

goetz

Nothing is wrong, it works for me.

Also this has nothing to do with Qt.

denya

I have understood about Qt, but input data doesn`t work in the console:

Launching /home/denis/tutorial-build-desktop/tutorial...
Input number: 1

1
2
2w

d
c

I can input everything and the programm doesn`t have any reaction.

denya

The debugger wrote:

&"warning: GDB: Failed to set controlling terminal: \320\235\320\265\320\264\320\276\320\277\321\203\321\201\321\202\320\270\320\274\321\213\320\271 \320\260\321\200\320\263\321\203\320\274\320\265\320\275\321\202\n"

goetz

If you have a console application that reads from the console then please do start it on the console and neither in a debugger nor in your IDE.

EDIT: PS: If you had provided us that information before, you would have got an answer.

goetz

Moved to tools forum, as it seems to be an issue with how to use Qt Creator properly.

mzimmers

Hi, Volker -

So, do I understand from your post above that if a program needs console input, we can't/shouldn't launch it from Creator?

goetz

At least it's hard to debug, because you have no means to input your data (at least I'm not aware of one), so your program hangs once it tries to read from stdin.

mzimmers

OK, thanks. I suppose that, given that Qt is a GUI development system, this is reasonable, though it may surprise some people who come from a more conventional IDE like Eclipse.

Is there at least a way to launch the terminal from Qt? Some minor level of integration would make it a little easier.

EDIT: let me rephrase that: there does appear to be some kind of terminal integration (though I can't get it to work for me); can one launch an app to terminal from Qt while still controlling the app through the Qt debugger? That would be slick.

goetz

It's not a problem of GUI or console development. You can have console input on a GUI program too :-)

Ah, seems that I was wrong!

In the run settings (project view of Creator) you can check a checkbox "run in terminal", this might be what you want. It's a bit cumbersome on the mac though (I remember you being on OS X, right?). You must set the terminal application on the mac to

/Applications/Utilities/Terminal.app/Contents/MacOS/Terminal

(Settings, Environment, first tab)

mzimmers

That sure seems like it should work, doesn't it? But, when I try to start a debug session, I get an error message at launch, saying it can't start the terminal emulator '/Applications/Utilities/Terminal.app/Contents/MacOS/Terminal'. Dunno...

tobias.hunger

There actually is a "launch in terminal" in the run settings of your project in Qt Creator... Go to project mode and visit the run settings there.

mzimmers

I assume you mean the "Run in terminal" check box? I have that checked. Still doesn't go.

goetz

[quote author="mzimmers" date="1302358795"]That sure seems like it should work, doesn't it? But, when I try to start a debug session, I get an error message at launch, saying it can't start the terminal emulator '/Applications/Utilities/Terminal.app/Contents/MacOS/Terminal'. Dunno...
[/quote]

This should work. Where is your Terminal.app located? You'll need to enter

/path/to/Terminal.app/Contents/MacOS/Terminal

into the config field.

EDIT: You actually are on a Mac, aren't you?

mzimmers

Heh...yes, I'm on a Mac, and the path you provided above is indeed the correct one. No idea why it's not working.

[Moved] QT and data input in ubuntu terminal

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