Problem with second Ui::dialog (Visual Studio QT Add in)

[ChristianEhrlicher]

You should name the dialog in the ui file different from the first one.

[d_stranz]

C2027 Use of the undefined type "Ui:: Dialog" QtWidgetsApplication7 C:\Users\lauer\source\repos\QtWidgetsApplication7\ QtWidgetsApplication7\Messdialog.cpp 15

In your seconddialog class definition, you have declared a member variable of the type Ui:: Dialog. There is no such class. Your code should read:

private:
	Ui::seconddialog ui;

private:
	Ui::seconddialog ui;

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(Assuming that you named the Ui class "seconddialog" in your .ui file. Whatever you named it, the name in the ui file must match the name you use in your QDialog class definition.)