QT Creator cannot find <Qdialog> in Windows 10

[BKBK]

@JKSH said in QT Creator cannot find <Qdialog> in Windows 10:

See https://1drv.ms/w/s!AnaQjhA33g0K0lkIZPVjfsWrcPSI for a fully detailed walkthrough. (If you have time, I would be grateful if you provide feedback on what's helpful and what's unclear in the document)

I detected my first error. When I saw the Preview option in the installed dialogs I presumed it meant to preview what I am about to install. After making that correction the install was much faster.
Some comments.

As I follow the Get Started thread of the creator I want the ability to separate that text and guidance from the creator so I can see it while I create the project. One on each monitor.

When selecting the components, please shown the total amount of data to be downloaded for each.
I am working it now but wanted to post before I spend considerable time in getting the first project running.
So far, so good.
Thanks for your details.

[BKBK]

The install has been completed. Worked through a few menus and a few referenced web pages and found the example code for basic layouts. The project directory is here:
C:\QT5\Examples\Qt-5.12.0\widgets\layouts\basiclayouts
This line is flagged
#include <QApplication>
And the error QApplication not found.
I surmise there is a fundamental setup step to perform that I missed. Please advise me of where to find it.

[SGaist]

I would do a search in the Qt installation to ensure that the file is there (and it should).

[BKBK]

Yes, it exists, here: "C:\QT5\5.12.0\msvc2017_64\include\QtWidgets\QApplication"
After looking around the menu's for Qt Creator I don't see anything to indicate that the paths should be entered there for all projects. A right click on the project in the project explorer (the left panel of Creator) brings up a dialog that leads to a dialog to Add Library. When the path is pasted in the Next button remains disabled. Only the Cancel is enabled. That screen capture has been uploaded.
When Visual Studio was installed, several times and multiple versions over the years, it never required the user to find all the libraries such as <iostream.h> and specifically tell VS where to find them. I do expect the same of Qt.
edit: the point of the image is, in part: The dialog will not allow any editing in field Library:, field Include path contains a path, yet button Next is disabled. Please provide some information as to why the Next button is disabled.

[aha_1980]

@BKBK Did you already build the project or was it just the inline error from the code model that showed up? I have seen that too a couple of times before the project was build first.

[BKBK]

That was from the first attempt. The first project has yet to be built.

[JKSH]

@BKBK said in QT Creator cannot find <Qdialog> in Windows 10:

The install has been completed. Worked through a few menus and a few referenced web pages and found the example code for basic layouts. The project directory is here:
C:\QT5\Examples\Qt-5.12.0\widgets\layouts\basiclayouts
This line is flagged
#include <QApplication>
And the error QApplication not found.
I surmise there is a fundamental setup step to perform that I missed. Please advise me of where to find it.

Please post screenshots of:

• The screen which shows you the "QApplication not found" message
• Tools > Options... > Kits > Kits
• Tools > Options... > Kits > Qt Versions

@BKBK said in QT Creator cannot find <Qdialog> in Windows 10:

As I follow the Get Started thread of the creator I want the ability to separate that text and guidance from the creator so I can see it while I create the project. One on each monitor.

Try the Window > Open in New Window menu item

When selecting the components, please shown the total amount of data to be downloaded for each.

It does, doesn't it? The 2nd screenshot at https://1drv.ms/w/s!AnaQjhA33g0K0lkIZPVjfsWrcPSI shows:

Qt 5.11.0 Prebuilt Components for MinGW 5.3.0 32-bit

This component will occupy approximately 3.64 GB on your hard disk drive.

edit: the point of the image is, in part: The dialog will not allow any editing in field Library:, field Include path contains a path, yet button Next is disabled. Please provide some information as to why the Next button is disabled.

This dialog is for adding 3rd-party libraries. Most Qt applications don't need it.

For now, let's focus on your main issue (the inability to build example projects) -- please provide the screenshots requested above. I'll answer your questions about the Add Library dialog after that's resolved.

[BKBK]

There is something, make that, there are a few things that are probably here but I am missing. This is a weekend and most developers have better things to do so I am going to split this into two threads.
First, I answer the immediate questions posed about why Creator will not build the example project.
After posting that, I have a suspicion that it might not like installing in directory QT5 rathner than just QT so I will uninstall and perform the same install to the true default directory C:\QT.
To the first part, I am not able to build the example program. Here are the steps.
Note that I was ready to change virus detection app to Bit Defender and currently have no protection application installed.

1. Start QT Creator, click Example, scroll down to what looks like the most simple example, Basic Layouts and click it. A new window is opened

Side note: I must capture each image again and save it to a file to insert here.

The goal is to simply run an example so click Running the Example

From the dialog, …open the Welcome mode …
That is how I arrived here, circular, but understandable.
Click Building and Running an Example and am rewarded with web page: http://doc.qt.io/qtcreator/creator-build-example-application.html
It starts over. Repeat steps 1 and 2.
This time the code is displayed, the main app.
The first line if code is flagged as an error. It’s a mouse hover display so the display cannot be captured.
Look across the bottom to see what is in the various items there. Compile Output is empty.
General Messages contains this text:

Running Windows Runtime device detection.
No winrtrunner.exe found.
Could not find qmake spec 'default'.
Error while parsing file C:\QT5\Examples\Qt->5.12.0\widgets\layouts\basiclayouts\basiclayouts.pro. Giving up.

The others are empty except search results which is a blank search form.

Return to the web page for step 3:
…, click the Kit Selector and select a kit for the device.
After checking all the menu items the best fit is: Build -> Open Build and Run Kit Selector
Click that to be rewarded with a popup in the lower left corner. When the snipping tool is clicked the popup closes prohibiting capture. The text is:

The project basiclayouts is not yet configured.
You can configure it in the Projects Mode

Click that link: Projects Mode to get here:

In the main panel: Configure Project, as a novice Creator users, I don’t know what to enter in the field: Type to filter kits by name.
Try the top down Import Build from to get the path
C:\QT5\Examples\Qt-5.12.0\widgets\layouts

Click the wide pushbutton Import. No response. The button Configure Project is disabled.
Go to the left panel and select Manage Kits and the reward is the Options dialog.

This novice is quite unsure of what to do.
As the basic path is to configure kits, go that way.
The Auto-detected looks good. The down arrow only closes it.
There are two options available: the Add button and the OK button.
I presume ( I presume you understand the word presume, grin.) the dialog is correctly configured and select OK.
The window closes with no apparent action taken.

I presume, but only because there is little other choice, that the proper activity was completed. I do suspect that is not the case.

Next step is a guess. The dialog to Manage Kits was taken and apparently completed so click Build.
The only option enabled is:
Build -> Open Build and Run Kit Selector

That is circular. That’s enough here. This will require quite a bit of time to edit into a response.
I stop here to uninstall and re-install with the default location unchanged.
Should I back up to a previous version or use the same version. I suspect that the previous version has a higher probability of success, but that is changing two variables in one step. I will stay with the latest version.

[JKSH]

@BKBK said in QT Creator cannot find <Qdialog> in Windows 10:

The key is this: "No valid kits found".

We need to find out what's missing in your kits configuration.

1. Click on Desktop Qt 5.12.0 MSVC2017 64-bit in your screenshot to reveal the detailed properties. Post a screenshot.
2. Mouse-over the 2 yellow exclamation marks in your screenshot. Post the exact pop-up messages.
3. Post a screenshot of the Qt versions tab.

[JKSH]

OK, root cause found: https://forum.qt.io/topic/97455/qt-install-fourth-attempt

Qt Creator needs to find your installation of MSVC 2017.

Let's continue the discussion in the other thread. I'm locking this one to help focus on troubleshooting.