Xlib.h include problem

[mrdebug]

Hi, I'm writing a simple app that sends keystrokes to the active forms under X11.
I need to use the header "Xlib.h".
After adding the header in my .h file I have this compile error:

In file included from /usr/include/X11/Xlib.h:44:0,
                 from ../PianoJoke/qfmainwindow.h:11,
                 from ../PianoJoke/main.cpp:1:
/Dati/Qt/Qt5.11.1/5.11.1/gcc_64/include/QtCore/qcoreevent.h:63:9: error: expected identifier before numeric constant
         None = 0,                               // invalid event
         ^
/Dati/Qt/Qt5.11.1/5.11.1/gcc_64/include/QtCore/qcoreevent.h:63:9: error: expected ‘}’ before numeric constant
/Dati/Qt/Qt5.11.1/5.11.1/gcc_64/include/QtCore/qcoreevent.h:63:9: error: expected unqualified-id before numeric constant
In file included from /Dati/Qt/Qt5.11.1/5.11.1/gcc_64/include/QtGui/qwindowdefs.h:44:0,
                 from /Dati/Qt/Qt5.11.1/5.11.1/gcc_64/include/QtWidgets/qwidget.h:44,
                 from /Dati/Qt/Qt5.11.1/5.11.1/gcc_64/include/QtWidgets/qmainwindow.h:44,
                 from /Dati/Qt/Qt5.11.1/5.11.1/gcc_64/include/QtWidgets/QMainWindow:1,
                 from ../PianoJoke/qfmainwindow.h:4,
                 from ../PianoJoke/main.cpp:1:
/Dati/Qt/Qt5.11.1/5.11.1/gcc_64/include/QtCore/qobjectdefs.h:122:5: error: ‘friend’ used outside of class
     friend Q_DECL_CONSTEXPR const QMetaObject *qt_getEnumMetaObject(ENUM) Q_DECL_NOEXCEPT { return &staticMetaObject; } \
     ^
/Dati/Qt/Qt5.11.1/5.11.1/gcc_64/include/QtCore/qobjectdefs.h:124:30: note: in expansion of macro ‘Q_ENUM_IMPL’
 #define Q_ENUM(x) Q_ENUMS(x) Q_ENUM_IMPL(x)

What can I do in order to use the Xlib.h header in a Qt app?

[jsulm]

@mrdebug said in Xlib.h include problem:

qfmainwindow.h

Can you show its content?

[mrdebug]

It is completely empty. The behaviour occurs just adding "#include <X11/Xlib.h>" to an empty Qt project.

#ifndef QFMAINWINDOW_H
#define QFMAINWINDOW_H

#include <QMainWindow>
#include <X11/Xlib.h>

namespace Ui {
class QFMainWindow;
}

class QFMainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit QFMainWindow(QWidget *parent = 0);
    ~QFMainWindow();

private:
    Ui::QFMainWindow *ui;
};

[jsulm]

@mrdebug Can you try

extern "C"
{
  #include <X11/Xlib.h>
}

[SGaist]

Hi,

You can also try to include Xlib.h before your Qt includes.

[mrdebug]

Solved by creating an external library that encapsulate the x11 layer.

[Ines]

@mrdebug can you explain me how you created the library and where is allocated?

[mrdebug]

Have you never written and used a library?
It is the same.
Which is your doubt exactly?