[Resolved] How to disable a button in a button box?

[realtebo]

bq.
C:\Qt_Projects\Hello10\dialog.cpp:9: error: invalid use of incomplete type 'class QPushButton'
ui->buttonBox->button(QDialogButtonBox::Ok)->setEnabled(false);
^

caused by

@
ui->setupUi(this);
ui->buttonBox->button(QDialogButtonBox::Ok)->setEnabled(false);
@

What does it mean ?
I tried to read the doc but this seems to be ok.

'ui' is a form designer generated form
'buttonBox' is the objectName of a ... buttonBox

[realtebo]

I found the answer:

in the dialog header i have to do this:

@
#include <QPushButton>
@

[guru]

Hi, Realtebo,

mark it as solved.