The problem is that you can't find the header file starting with ui.

[IknowQT]

#pragma once

#include <QWidget>
#include "ui_WTest.h"

class WTest : public QWidget
{
	Q_OBJECT

public:
	WTest(QWidget *parent = Q_NULLPTR);
	~WTest();

private:
	Ui::WTest ui;
};

"The current source file is not in the directory or build system path."

I'm developing in vs2019, and I clicked go to the ui_WTest.h file to see the ui file, but it says it can't find the path, but it builds normally? How can we solve this problem?
I can't proceed with development because I can't access it from cpp to the ui control itself.

I created a new project in qt creator, but I can't find a path for this either.

[ChrisW67]

That file is generated from the corresponding WTest.ui file that should be listed in the PRO file FORMS variable.

[IknowQT]

@ChrisW67

Why can't I find a path when it's easy to create?

[jsulm]

@IknowQT said in The problem is that you can't find the header file starting with ui.:

Why can't I find a path when it's easy to create?

Again: ui_WTest.h will be generated when you build your app, before you build it does NOT exist!
Did you do what @ChrisW67 suggested? "hat file is generated from the corresponding WTest.ui file that should be listed in the PRO file FORMS variable" - so, is WTest.ui in your pro file in the FORMS variable?

[IknowQT]

@jsulm

# ----------------------------------------------------
# This file is generated by the Qt Visual Studio Tools.
# ------------------------------------------------------

# This is a reminder that you are using a generated .pro file.
# Remove it when you are finished editing this file.
message("You are running qmake on a generated .pro file. This may not work!")


HEADERS += ./MainWidget.h \
    ./WTest.h \
    ./WLogin.h
SOURCES += ./MainWidget.cpp \
    ./main.cpp \
    ./WLogin.cpp \
    ./WTest.cpp
FORMS += ./MainWidget.ui \
    ./WLogin.ui \
    ./WTest.ui
RESOURCES += MainWidget.qrc

I checked that it is in the path and if I build with debug, I also checked that it is created in x64\debug\uic, but the same message still appears.

[jsulm]

@IknowQT Why do you have ./ in front of every file you add to your project?

[IknowQT]

@jsulm

Is there any reason the path is different in front?
Even when I try to create a new project, I get the same error.

[jsulm]

@IknowQT said in The problem is that you can't find the header file starting with ui.:

Is there any reason the path is different in front?

I don't know what this means.

"Even when I try to create a new project, I get the same error" - what type of project do you create? Create a widgets project - that one should work and you also can see how pro file should look like.

[IknowQT]

@jsulm

It means there is something wrong with my widget project path, so I created a new project, but the same problem occurs.
The newly created project path is the same.

[J.Hilk]

@IknowQT
make sure your project path has no special characters in it, no whitespaces no unicode etc.

[IknowQT]

@J-Hilk

What I really don't understand is that MainWidget.ui and WLogin.ui files are accessible? Why is it only like Test, which is the same condition?

[J.Hilk]

@IknowQT how did you create your WTest class, I don't think you used the wizard, because it has non default stuff in it like #pragma once and missing explicit keyword for the constructor.
are you sure the (raw)ui file actually exists ?

[IknowQT]

@J-Hilk

I checked that it was created in the x64\debug\uic path, only Wtest can't access it...

[J.Hilk]

@IknowQT
WTest.ui has the path x64\debug\uic\WTest.ui ?

because thats not the one you specified in the project file

[IknowQT]

@J-Hilk
Exactly ui_WTest.h.
In that path, the files that I said were accessible are also in the same path.