QAxWidget - my controler could not be instantiated

[ArnaudC]

Hello,
I use Qt 4.8.4.

I try to use a ActiveX controler with this :

ui.setupUi(this);
QAxWidget * pWindow = new QAxWidget();
pWindow->setControl( "HKEY_CLASSES_ROOT\\TypeLib\\{ACFC5869-1D0F-4E2C-B898-05805607D542}" );
 
setCentralWidget( pWindow );

ui.setupUi(this);
QAxWidget * pWindow = new QAxWidget();
pWindow->setControl( "HKEY_CLASSES_ROOT\\TypeLib\\{ACFC5869-1D0F-4E2C-B898-05805607D542}" );

setCentralWidget( pWindow );

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but I have

QAxBase::setControl: requested control HKEY_CLASSES_ROOT\TypeLib\{ACFC5869-1D0F-4E2C-B898-05805607D542} could not be instantiated

QAxBase::setControl: requested control HKEY_CLASSES_ROOT\TypeLib\{ACFC5869-1D0F-4E2C-B898-05805607D542} could not be instantiated

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in the output command

I checked in the register base, the key seems to be right. Otherwise can I put the path to right .ocx directly in the setControl()?