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Question

determine platform Qt application is running on at runtime

Answer 1

+4 A:

There are macro that are defined on the corresponding platforms:

Q_WS_X11
Q_WS_MAC
Q_WS_QWS
Q_WS_WIN

For more informations there is the QSysInfo class.

Georg 2009-01-24 09:24:33

Nope the macros are compiletime. Good call on QSysInfo though, even though it's not comprehensive.

2009-01-24 09:45:58

A Qt application is going to be compiled separately for different platforms though - why is it necessary to know at runtime?

thekidder 2009-01-24 17:12:38

No idea, and what's not comprehensive about QSysInfo I don't know either. QSysInfo is only usable in combination with those macros.

Georg 2009-01-24 17:33:58

thekidder, now that you ask no idea ;) The OP did request it though.gs, for one thing, QSysInfo lacks the Linux version

2009-01-24 18:34:23

Linux has no clearly defined versions. The only thing that it's got is the kernel version.

Georg 2009-01-24 19:01:18

At the least, there's the kernel version and X server version, and then there's the LSB distro-id string (as in "lsb_release -a"). No idea if it would be actually useful, though :)

2009-01-24 20:22:15

Answer 2

+5 A:

You can write this function:

QString getSystem() {
    #ifdef Q_WS_X11
    return QString("Linux");
    #endif

    #ifdef Q_WS_MAC
    return QString("Mac");
    #endif

    #ifdef Q_WS_QWS
    return QString("Embedded Linux");
    #endif

    #ifdef Q_WS_WIN
    return QString("Windows");
    #endif
}

I think this is as dynamic as it gets, why would you want to have it more dynamic?

Some more informations can be found here: http://stackoverflow.com/questions/341594/how-do-i-read-system-information-in-c

Georg 2009-01-24 17:09:58

Answer 3

+7 A:

Note that the Q_WS_* macros are defined at compile time, but QSysInfo gives some run time details.

To extend gs's function to get the specific windows version at runtime, you can do

#ifdef Q_WS_WIN
switch(QSysInfo::windowsVersion())
{
  case QSysInfo::WV_2000: return "Windows 2000";
  case QSysInfo::WV_XP: return "Windows XP";
  case QSysInfo::WV_VISTA: return "Windows Vista";
  default: return "Windows";
}
#endif

and similar for Mac.

Reed Hedges 2009-01-24 18:27:08

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