I can't connect signal QProcess::started() to a slot

[Petruza]

Hi, I'm starting with QT, I try to connect a slot to signal QProcess::started() but can't. QObject::connect() returns false.
Any idea what am I doing wrong?

Here's part of the code:


class foo : public QObject
{
public:
QProcess *process;

public slots:
void process_started();
}

foo::foo()
{
process = new QProcess();
bool status = QObject::connect( process, SIGNAL( started() ), this, SLOT( process_started() ) );
// status is false, meaning the slot and signal couldn't be connected
}


I know the process starts successfully because I tried process->WaitForStarted() and it returns true.
But I put a breakpoint at the slot foo::process_started() and it never gets hit.
What's the problem here?
Thanks!

[yogeshgokul]

Please write this Q_OBJECT macro in your class declaration. Like this.



class foo : public QObject
{
Q_OBJECT
public:
QProcess *process;

public slots:
void process_started();
}

foo::foo()
{
process = new QProcess();
bool status = connect( process, SIGNAL( started() ), this, SLOT( process_started() ) );// Removed QObject::
// status is false, meaning the slot and signal couldn't be connected
}

[spirit]

...and rerun qmake & make. :)

[Petruza]

Thanks Autobot, you're right!
About qmake, I'll let QTcreator handle it ;)
Although QTcreator is pretty slow, don't you think?

[yogeshgokul]

Thanks Autobot
!! VOILA !!:D


Although QTcreator is pretty slow, don't you think?
If you compare it with VS then yes.:)

[Petruza]

I hope it's not slow because it's built with QT :(
In your experience, applications made with QT are slow? do they have other downside?

[yogeshgokul]

I hope it's not slow because it's built with QT :(
Not at all. Its slow on windows because its compiler and debugger(=GDB) is slow. Creator can be used with MSVC on Windows, too – even for debugging. ;)


In your experience, applications made with QT are slow? do they have other downside?
No they are fast enough. Coz C++ is fast.

[Petruza]

Creator can be used with MSVC on Windows, too – even for debugging. ;)
So I've read, I'll try it.
There's a QT plugin for MSVC right?

[yogeshgokul]

Yes.. :) !