c++ - How to synthesize key press events? -

i able key value's hal through call function in qt. created event key qkeyevent *event = new qkeyevent (qevent::keypress, inputkey.keyvalue, qt::nomodifier);

note: inputkey.keyvalue key value received hal layer.

now need register key event in qt, if key press happened in ir remote in respective form, keypressevent(e) or event(e) invoke. , based on key press, specific action execute.

note: more 1 form there, key press event trigger , more 1 keys there "page_up, page_down, ok key etc....."

tried invoke postevent() , connect(.......) nothing helped me. keypressevent() not getting executed.

e.g. this:

// receiver pointer qobject qcoreapplication::postevent (receiver, event); 

you can find more info here.

you can reimplement qobject::event() or qwidget::keypressevent in widget receive key events. visit link or link more information. see example code below consists of 2 buttons , label. clicking pushbutton sends 'enter pressed' , pushbutton_2 sends 'letter pressed'. key events received in event() function , label updated accordingly.

mainwindow::mainwindow(qwidget *parent) :     qmainwindow(parent),     ui(new ui::mainwindow) {     ui->setupui(this);     connect(ui->pushbutton, signal(clicked()), this, slot(sendkeyevent()));     connect(ui->pushbutton_2, signal(clicked()), this, slot(sendkeyevent())); }  void mainwindow::sendkeyevent() {     qobject* button = qobject::sender();     if (button == ui->pushbutton)     {         qkeyevent *event = new qkeyevent (qevent::keypress, qt::key_enter, qt::nomodifier);         qcoreapplication::postevent (this, event);     }     else if (button == ui->pushbutton_2)     {         qkeyevent *event = new qkeyevent (qevent::keypress, qt::key_a, qt::nomodifier);         qcoreapplication::postevent (this, event);     } }  bool mainwindow::event(qevent *event) {     if (event->type() == qevent::keypress)     {         qkeyevent *keyevent = static_cast<qkeyevent *>(event);         if (keyevent->key() == qt::key_enter) {             ui->label->settext("enter received");             return true;         }         else if (keyevent->key() == qt::key_a)         {             ui->label->settext("a received");             return true;         }     }      return qwidget::event(event); }