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compiler reports that Ui is an incomplete type

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  • A Offline
    A Offline
    aha_1980 Lifetime Qt Champion
    replied to fcarney on 10 Jun 2019, 15:11 last edited by
    #4

    @fcarney Ui::WifiSetup, that is.

    But most likely an auto-generated designer widget. If so, then including the ui_wifisetup.h should suffice.

    Qt has to stay free or it will die.

    M 1 Reply Last reply 10 Jun 2019, 15:30
    1
  • M Offline
    M Offline
    mzimmers
    replied to aha_1980 on 10 Jun 2019, 15:30 last edited by
    #5

    @aha_1980 I don't understand -- my class definition is in the header file, and the header file is included in the source file. (I didn't bother including this in my original post, as I thought it was the implicit method of creating classes.)

    wifisetup.h:

    namespace Ui {
        class WifiSetup;
    }
    
    class WifiSetup : public QDialog
    {
        Q_OBJECT
    
    private:
        Ui::WifiSetup *ui;
    ...
    

    wifisetup.cpp:

    #include "wifisetup.h"
    #include "ui_wifisetup.h"
    #include "worker.h"
    
    WifiSetup::WifiSetup(QString serialNbr, DeviceModel *d, QModelIndex *qmi, Worker *pWorker, QWidget *parent) :
        QDialog(parent),
        ui(new Ui::WifiSetup),
    ...
    

    I'd expect the definition (from the header file) to be visible here, so I guess I don't understand how this really works.

    A F 2 Replies Last reply 10 Jun 2019, 15:56
    0
  • A Offline
    A Offline
    aha_1980 Lifetime Qt Champion
    replied to mzimmers on 10 Jun 2019, 15:56 last edited by
    #6

    @mzimmers you have a class WifiSetup, but no class Ui::WifiSetup. Thats what the compiler complains about.

    Qt has to stay free or it will die.

    M 1 Reply Last reply 10 Jun 2019, 15:59
    0
  • M Offline
    M Offline
    mzimmers
    replied to aha_1980 on 10 Jun 2019, 15:59 last edited by
    #7

    @aha_1980 I'm doing (what appears to be) the same thing in another class, and that compiles fine.

    namespace Ui
    {
        class EditDialog;
    }
    
    class EditDialog : public QDialog
    {
        Q_OBJECT
    public:
        explicit EditDialog(DeviceModel *d, QModelIndex *qmi, Worker *pWorker, QWidget *parent = nullptr);
    private:
        Ui::EditDialog *ui;
    ...
    }
    EditDialog::EditDialog(DeviceModel *d, QModelIndex *qmi, Worker *pWorker, QWidget *parent) :
        QDialog(parent),
        ui(new Ui::EditDialog),
    ...
    

    I'm sure I'm overlooking something obvious, but they look the same to me.

    1 Reply Last reply
    0
  • F Offline
    F Offline
    fcarney
    replied to mzimmers on 10 Jun 2019, 16:17 last edited by
    #8

    @mzimmers said in compiler reports that Ui is an incomplete type:

    new Ui::WifiSetup

    Is this a new class? I would do a clean project, a run qmake, and the build for good measure. You are right, they do look the same. It should work.

    C++ is a perfectly valid school of magic.

    M 1 Reply Last reply 10 Jun 2019, 16:20
    0
  • M Offline
    M Offline
    mzimmers
    replied to fcarney on 10 Jun 2019, 16:20 last edited by
    #9

    @fcarney I've done all that. Even deleted my build directory. I know it's some brain-dead mistake I've introduced somewhere, but I sure can't find it.

    K 1 Reply Last reply 10 Jun 2019, 16:54
    0
  • K Offline
    K Offline
    kshegunov Moderators
    replied to mzimmers on 10 Jun 2019, 16:54 last edited by
    #10

    @mzimmers said in compiler reports that Ui is an incomplete type:

    I know it's some brain-dead mistake I've introduced somewhere, but I sure can't find it.

    @aha_1980 said it. You have, I'm betting, something called wifisetup.ui in your project. If you don't then that's a problem. Then you should have #include "ui_wifisetup.h" in your cpp file. If you don't then that's a problem. Note that Ui::WifiSetup is different from WifiSetup, the former's namespaced for good reason.

    Read and abide by the Qt Code of Conduct

    M 1 Reply Last reply 10 Jun 2019, 17:13
    1
  • M Offline
    M Offline
    mzimmers
    replied to kshegunov on 10 Jun 2019, 17:13 last edited by
    #11

    @kshegunov yes on both counts: I have a wifisetup.ui file in the project, and I include "ui_wifisetup.h" in my wifisetup.cpp file. It should be functionally identical to my editdialog class, which compiles just fine. Wifisetup used to compile, too. But I introduced a change somewhere that I can't find and it's causing this issue.

    K 1 Reply Last reply 10 Jun 2019, 18:30
    0
  • K Offline
    K Offline
    kshegunov Moderators
    replied to mzimmers on 10 Jun 2019, 18:30 last edited by kshegunov 6 Oct 2019, 18:31
    #12
    error: allocation of incomplete type 'Ui::WifiSetup'
    

    This means the class declaration is not available. Troubleshoot as follows (skip steps that you've checked already):

    1. Make sure you include the generated header where you allocate.
    2. Make sure qmake's rerun
    3. Make sure the name of the widget in the designer matches the name of the class.

    Read and abide by the Qt Code of Conduct

    M 1 Reply Last reply 10 Jun 2019, 19:40
    5
  • F Offline
    F Offline
    fcarney
    wrote on 10 Jun 2019, 18:40 last edited by
    #13

    @mzimmers said in compiler reports that Ui is an incomplete type:

    I introduced a change somewhere

    I think that in order for this to be an issue then that change would have been somewhere in the .h file. Is there anything in the .h that defines the prototype that does anything more than define a pointer than this: Ui::EditDialog *ui; I am thinking of functions defined as inline vs functions defined in a cpp file.

    or

    Something is interfering with the compilation of cpp files associated with that object. Did a cpp file get excluded from the pro file? By accident or design?

    C++ is a perfectly valid school of magic.

    K 1 Reply Last reply 10 Jun 2019, 18:41
    0
  • K Offline
    K Offline
    kshegunov Moderators
    replied to fcarney on 10 Jun 2019, 18:41 last edited by
    #14

    You're wrong. :)

    Read and abide by the Qt Code of Conduct

    1 Reply Last reply
    0
  • M Offline
    M Offline
    mzimmers
    replied to kshegunov on 10 Jun 2019, 19:40 last edited by
    #15

    @kshegunov said in compiler reports that Ui is an incomplete type:

    error: allocation of incomplete type 'Ui::WifiSetup'
    

    This means the class declaration is not available. Troubleshoot as follows (skip steps that you've checked already):

    1. Make sure you include the generated header where you allocate.
    2. Make sure qmake's rerun
    3. Make sure the name of the widget in the designer matches the name of the class.

    Ding. It was #3, a result of my hasty editing in Designer. Thanks to all who looked at this.

    1 Reply Last reply
    4
  • K Offline
    K Offline
    Kent-Dorfman
    wrote on 11 Jun 2019, 04:23 last edited by
    #16
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    10 Jun 2019, 18:40

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