QT app Run once

[bunjee]

Well that's why you use Qt over MFC, because you don't have to code architecture specific components. If one purchase a Qt license he could expect to have this crucial feature out of the box.

Correct me if I'm wrong but QtSinglaApp feels more like : "Too bad you need to pay extra bucks for doing that crucial feature".
Instead of
"It's so complicated to develop we've decided to charge you more".

Anyway, thanks for the help guys .

[marcel]

If one purchase a Qt license he could expect to have this crucial feature out of the box.

It is not a crucial feature. You just feel like that because you need it right now.
If you'd have started to implement your own last night when you first asked about it, it would have been ready right now. Twice .

[bunjee]

It is not a crucial feature. You just feel like that because you need it right now.
If you'd have started to implement your own last night when you first asked about it, it would have been ready right now. Twice .

I guess that's the difference between you and me marcel. I'm taking one week to develop such a feature :-).

[marcel]

I guess that's the difference between you and me marcel. I'm taking one week to develop such a feature :-).

But why? It shouldn't. I find it very useful that Trolltech offered some insight on how QtSingleApplication was implemented. Once you had this information, the Internet is full of documentation on FindWindow and WM_COPYDATA, and the other methods used on the other platforms.

[bunjee]

Right,
I'll take a look and I'll post my home-made implementation.

And guess what ? It'll be free.

[THRESHE]

Anybody knows where can I get first parameter for FindWindow function? It is registered window class name and I don't know how to obtain it

[jpn]

Just as docs say, use RegisterClass(). If title is enough, you can do:

WId QxtWindowSystem::findWindow(const QString& title)
{
    std::wstring str = title.toStdWString();
    return ::FindWindow(NULL, str.c_str());
}

WId QxtWindowSystem::findWindow(const QString& title)
{
    std::wstring str = title.toStdWString();
    return ::FindWindow(NULL, str.c_str());
}

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[THRESHE]

It's funny today I've asked two questions and 5 minutes after I've found a solution myself
But I suppose that hardcoding window name is not the best idea...
I've done it like this

wchar_t *str = new wchar_t[16];
mbstowcs(str,"My Window Title", 16 );
qDebug()<<"------------------------------------";
qDebug()<<FindWindow(0, str);
qDebug()<<"------------------------------------";

wchar_t *str = new wchar_t[16];
mbstowcs(str,"My Window Title", 16 );
qDebug()<<"------------------------------------";
qDebug()<<FindWindow(0, str);
qDebug()<<"------------------------------------";

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But anyway thanks jpn

[THRESHE]

Does anybody know how to implement run once application on Mac OS X ? In the docs on QSingleApplication I've read that they use "named ports". Anyone knows what is it ? Some links would be very useful...