Qt Gamepad documentation

TimurE · wrote on 24 Nov 2016, 20:28

Hello.

I want to develop an application that would handle gamepad events. Many gamepads will be connected to the computer, and the program should know what button of what gamepad have pressed.

I haven't found how to work with many gamepads with QGamepad.

SGaist · wrote on 24 Nov 2016, 21:31

Hi and welcome to devnet,

Looks like you are searching for the QGamepadManager class which looks like it has its documentation missing. However a quick look at the module examples should get you going.

Hope it helps.

TimurE · wrote on 25 Nov 2016, 21:49

And if I want to connect all signals button...Changed to one slot, should I connect them one by one? Or I can get list of buttons and connect it to slot in a loop?

SGaist · wrote on 25 Nov 2016, 22:04

You can use QMetaType inspection to get all signals and then filter them by name before creating the connections.

TimurE · wrote on 25 Nov 2016, 23:56

And I tried examples, and Qt doesn't see some of my gamepad keys. I use Genius g-08-xu gamepad. It works perfectly in another software, but Qt doesn't see buttons 3 and 6.

TimurE · wrote on 26 Nov 2016, 00:19

And I tried this example: http://www.ics.com/blog/whats-new-qt-570-qt-gamepad but it says that I have only one gamepad, but I have connected two gamepads. If I press any button in one of them, it prints a message that button was pressed, but shows the same device ID. And 3 and 6 buttons on Genius g-08-xu don't work with this example too.

SGaist · wrote on 26 Nov 2016, 17:50

What OS are you on ?

TimurE · wrote on 26 Nov 2016, 23:04

Linux. I tried on Windows (minGW) too, but it doesnt't work at all. Examples don't see any gamepads.

SGaist · wrote on 26 Nov 2016, 23:48

Did you check that the plugin get correctly loaded ?

TimurE · wrote on 27 Nov 2016, 01:45

How cat I check it?

SGaist · wrote on 27 Nov 2016, 09:11

Add QT_DEBUG_PLUGINS to the environment variables in the Run part of the Project panel and set it to 1.

You'll have more information on the debug output.

TimurE · wrote on 27 Nov 2016, 17:29

QFactoryLoader::QFactoryLoader() checking directory path "C:/Qt/Qt5.7.0/5.7/mingw53_32/plugins/gamepads" ...
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/Qt5.7.0/5.7/mingw53_32/plugins/gamepads/xinputgamepad.dll"
Found metadata in lib C:/Qt/Qt5.7.0/5.7/mingw53_32/plugins/gamepads/xinputgamepad.dll, metadata=
{
    "IID": "com.bsquask.Qt.Gamepad.QtGamepadBackendFactoryInterface.5.5",
    "MetaData": {
        "Keys": [
            "xinput"
        ]
    },
    "className": "QXInputGamepadBackendPlugin",
    "debug": false,
    "version": 329472
}


Got keys from plugin meta data ("xinput")
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/Qt5.7.0/5.7/mingw53_32/plugins/gamepads/xinputgamepadd.dll"
Found metadata in lib C:/Qt/Qt5.7.0/5.7/mingw53_32/plugins/gamepads/xinputgamepadd.dll, metadata=
{
    "IID": "com.bsquask.Qt.Gamepad.QtGamepadBackendFactoryInterface.5.5",
    "MetaData": {
        "Keys": [
            "xinput"
        ]
    },
    "className": "QXInputGamepadBackendPlugin",
    "debug": true,
    "version": 329472
}


"The plugin 'C:/Qt/Qt5.7.0/5.7/mingw53_32/plugins/gamepads/xinputgamepadd.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 
         not a plugin
QFactoryLoader::QFactoryLoader() checking directory path "C:/build-gamepadexample-Desktop_Qt_5_7_0_MinGW_32bit-Release/release/gamepads" ...
loaded library "C:/Qt/Qt5.7.0/5.7/mingw53_32/plugins/gamepads/xinputgamepad.dll"
loaded library "xinput1_4.dll"
loaded library "xinput1_3.dll"

Windows 7 x86 (32 bit)

TimurE · 6 Mar 2017, 04:50

I tried to use msvc 2015 instead of MinGW, but I got the same problem.

hskoglund · wrote on 27 Nov 2016, 22:40

Hi, if you're compiling in Debug mode, try instead to compile in Release mode.

TimurE · wrote on 28 Nov 2016, 03:05

Same problem:

Starting C:\build-gamepadexample-Desktop_Qt_5_7_0_MinGW_32bit-Release\release\gamepadexample.exe...
QGamePadManager Demo

QFactoryLoader::QFactoryLoader() checking directory path "C:/Qt/Qt5.7.0/5.7/mingw53_32/plugins/gamepads" ...
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/Qt5.7.0/5.7/mingw53_32/plugins/gamepads/xinputgamepad.dll"
Found metadata in lib C:/Qt/Qt5.7.0/5.7/mingw53_32/plugins/gamepads/xinputgamepad.dll, metadata=
{
    "IID": "com.bsquask.Qt.Gamepad.QtGamepadBackendFactoryInterface.5.5",
    "MetaData": {
        "Keys": [
            "xinput"
        ]
    },
    "className": "QXInputGamepadBackendPlugin",
    "debug": false,
    "version": 329472
}


Got keys from plugin meta data ("xinput")
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/Qt5.7.0/5.7/mingw53_32/plugins/gamepads/xinputgamepadd.dll"
Found metadata in lib C:/Qt/Qt5.7.0/5.7/mingw53_32/plugins/gamepads/xinputgamepadd.dll, metadata=
{
    "IID": "com.bsquask.Qt.Gamepad.QtGamepadBackendFactoryInterface.5.5",
    "MetaData": {
        "Keys": [
            "xinput"
        ]
    },
    "className": "QXInputGamepadBackendPlugin",
    "debug": true,
    "version": 329472
}


"The plugin 'C:/Qt/Qt5.7.0/5.7/mingw53_32/plugins/gamepads/xinputgamepadd.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 
         not a plugin
QFactoryLoader::QFactoryLoader() checking directory path "C:/build-gamepadexample-Desktop_Qt_5_7_0_MinGW_32bit-Release/release/gamepads" ...
loaded library "C:/Qt/Qt5.7.0/5.7/mingw53_32/plugins/gamepads/xinputgamepad.dll"
loaded library "xinput1_4.dll"
loaded library "xinput1_3.dll"
Number of gamepads: 0

hskoglund · wrote on 28 Nov 2016, 03:25

Hmm, I checked and it seems Qt Gamepad does not support all the different gamepads available on WIndows :-( I.e. the plugin loads fine but no gamepads are detected, more discussion here

Also you can try emulating a Microsoft device like an Xbox360-controller, for example I can use my Playstation4 controller by installing DS4Windows

TimurE · wrote on 28 Nov 2016, 05:09

I'll try it later.

But why Qt can support only part of gamepads? My gamepads are very old and work both in Windows and Linux without additional drivers.

TimurE · wrote on 29 Nov 2016, 23:48

DS4Windows doesn't see my gamepads. But Windows Control panel sees and shows pressed buttons.

hskoglund · wrote on 30 Nov 2016, 17:09

Because your gamepad is 12 years old (or more) I think it doesn't support the standard DirectX interface, only Windows control panel, that's why Qt is blind to it.
Also, when playing a 64-bit (only) game like BattleField1, I think such game will exhibit the same problem as Qt, i.e. not see your gamepad :-(

xiuscut · 6 Mar 2017, 05:07

@TimurE
I work at Win10 64 bits and QT5.7.0 ,msvc14。It canwork at this code.
Gamepad::Gamepad(QObject *parent) : QObject(parent)
, m_gamepad(0)
{
m_gamepad = new QGamepad(0,this);//or just m_gamepad = new QGamepad; is ok//
connect(m_gamepad,&QGamepad::connectedChanged,this,&MMGamepad::connectedChangedEvent);
qDebug() << "A new gamepad:"<<m_gamepad->isConnected();// when start is false
}
void Gamepad::connectedChangedEvent(bool value)
{
if(value)
{
qDebug() << "Gamepad:: decive is connect!" ;
}
else
{
qDebug() << "Gamepad:: decive is disconnect!" ;
}
}
and you can get any signal after"Gamepad:: decive is connect".