Qt Gamepad documentation

TimurE

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

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

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

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

TimurE

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

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

What OS are you on ?

TimurE

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

SGaist

Did you check that the plugin get correctly loaded ?

TimurE

How cat I check it?

SGaist

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

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

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

hskoglund

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

TimurE

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

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

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

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

hskoglund

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

@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".