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Editorial Team
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Asked: 2026-05-23T06:47:14+00:00

I have a QT application. It has functioning QPushButtons that are connected to slots

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I have a QT application. It has functioning QPushButtons that are connected to slots in my program. I am now trying to add a new button myNewButton, but somewhere, somehow it is not being registered.

For an existing, working button myExistingButton I have the line:

connect(ui->myExistingButton, SIGNAL(clicked()), this, SLOT(Foo()));

I cannot simply add the line:

connect(ui->myNewButton, SIGNAL(clicked()), this, SLOT(Foo()));

The compilation error is:

class UI::Viewer has no member named 'myNewButton'

And QT Creator does not list the button as an autocomplete option for ui-> (i.e. I haven’t simply mis-spelled the name). The records for myExistingButton and myNewButton are identical apart from coordinates and naming in the ui file. What could be causing this problem?

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1 Answer

  1. Editorial Team

    I fixed this by deleting the generated file ui_viewer.h and then rebuilding.

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