Qt5 COM Interface ITextInputPanel in windows doesn't work while fine in Qt4.7 (Touch Event)

ninon.lafourcade

Hello,
'm using the COM Interface ITextInputPanel (windows) in Qt4 (4.7.4) to display the OS Virtual Keyboard on touch event and it works fine.
But when I use Qt5 (5.3.2), windows refuse to display the keyboard.

Here the code.

MyDlg.h :

@
class CMyDlg : public QDialog
{
Q_OBJECT
protected:

ITextInputPanel* m_piTextInputPanel;
QLineEdit* m_pLineEdit;

public:
CDlgSelConfig(QWidget* parent = NULL);
~CDlgSelConfig();

virtual bool eventFilter(QObject *obj, QEvent *event);

protected slots:
void OnAccepted();

protected:
void _SetupUI();
};
@

@
CMyDlg::CMyDlg(QWidget* parent)
: QDialog(parent)
, m_piTextInputPanel(nullptr)
, m_pLineEdit(nullptr)
{
_SetupUI();
}

//--------------------------------------------------------------
CMyDlg::~CMyDlg()
{
if (m_piTextInputPanel != nullptr)
m_piTextInputPanel->Release();
}

//--------------------------------------------------------------
void CMyDlg::_SetupUI()
{
// cree la fentre
setObjectName(QString::fromUtf8("DlgSelConfig"));
resize(400, 311);
setMinimumSize(QSize(400, 100));
setWindowFlags(windowFlags()&(~Qt::WindowContextHelpButtonHint));

setWindowTitle(DLLRES_sLoadQString(IDS_CW_TITRE_SELPARAMETRAGE));

QGridLayout* pGridLayout=new QGridLayout(this);
QVBoxLayout* pVerticalLayout=new QVBoxLayout();

if( SUCCEEDED(CoCreateInstance( CLSID_TextInputPanel, nullptr, CLSCTX_INPROC, IID_ITextInputPanel, (void **) &m_piTextInputPanel)))
{

m_pLineEdit = new QLineEdit(this);
pVerticalLayout->addWidget(m_pLineEdit);

m_pLineEdit->installEventFilter(this);
m_pLineEdit->setAttribute(Qt::WA_NativeWindow);
m_pLineEdit->setAttribute(Qt::WA_AcceptTouchEvents);

HWND hWnd = (HWND)m_pLineEdit->winId();

//Attach the windows
XDBG(HRESULT hr = )m_piTextInputPanel->put_AttachedEditWindow(hWnd);
XASSERT(SUCCEEDED(hr));

XDBG(hr = )m_piTextInputPanel->put_InPlaceVisibleOnFocus(FALSE);
XASSERT(SUCCEEDED(hr));

XDBG(hr = )m_piTextInputPanel->put_DefaultInPlaceState(InPlaceState_Expanded);
XASSERT(SUCCEEDED(hr));
}
QObject::connect(pButtonBox, SIGNAL(rejected()), this, SLOT(reject()));
QObject::connect(pButtonBox, SIGNAL(accepted()), this, SLOT(OnAccepted()));
}

//--------------------------------------------------------------
void CDlgSelConfig::OnAccepted()
{
done(QDialog::Accepted);
}

//-------------------------------------------------------------------
bool CDlgSelConfig::eventFilter(QObject *pclSrc, QEvent *pclEvent)
{
if ((pclEvent->type()==QEvent::TouchBegin) && (pclSrc==m_pLineEdit))
{

XDBG(HRESULT hr = )m_piTextInputPanel->SetInPlaceVisibility(TRUE);
//hr=E_FAIL in Qt 5.3.2
}

return __super::eventFilter(pclSrc, pclEvent);
}
@

Any idea why ?

Thank you in advance.