How to show a window widget...

[agent007se]

Because the widget is created in the function tests() and destroyed once out of the function.

It should rather be

void CLinkGUI::tests()
{
     ui_sofImpl *test = new ui_sofImpl;
     test->show();
}

void CLinkGUI::tests()
{
     ui_sofImpl *test = new ui_sofImpl;
     test->show();
}

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Make sure you set the widget attribute Qt::WA_DeleteOnClose so that the widget is deleted automatically when it is closed.

I just added static before declaration of the variable :

static ui_sofImpl test;

static ui_sofImpl test;

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[wysota]

I just added static before declaration of the variable

Take a look at the FAQ please...