Print hook not working

[diniamo]

This is the code I use for creating the hotkey:

d_hotkey = new QHotkey(Qt::Key_Print, Qt::NoModifier, true, this);
qDebug() << "Is registered:" << d_hotkey->isRegistered();

It is printing true, but however many ways I try to connect the signal to a slot, it just doesn't work. It either prints:

qt.core.qobject.connect: QObject::connect: signal not found in QHotkey

or straight up doesn't do anything.

I'm on a Windows system.

Any ideas why this could be?

[Shatur]

How do you connect to the signal?

[diniamo]

As I said, I've tried every way I know.

QObject::connect(d_hotkey, SIGNAL(activated()), this, SLOT(printCaught()));
QObject::connect(d_hotkey, SIGNAL(activated(QPrivateSignal)), this, SLOT(printCaught(QPrivateSignal)));
QObject::connect(d_hotkey, &QHotkey::activated, this, [&](){
...
});
QObject::connect(d_hotkey &QHotkey::activated, this, &TrayHandler::printCaught);

TrayHandler is the type of *this.

I think there were a few more I tried but I don't remember.

[Shatur]

qt.core.qobject.connect: QObject::connect: signal not found in QHotkey

This message just says that you connected it wrong. Probably from one of the attempts.

But last two are 100% good. So the shortcut is not emitted for some reason.

[diniamo]

Hm.. I get the warning on the lambda one so that's interesting. I also thought it would be good since that's in the example in the readme. Same with the last one.

[diniamo]

Also, just to clarify, Qt::Key_Print is print screen right?

[Shatur]

Hm.. I get the warning on the lambda one so that's interesting.

That's impossible.

Also, just to clarify, Qt::Key_Print is print screen right?

Right.

[diniamo]

That's impossible.

[Shatur]

I can't reproduce it, the example from the README works jut fine for me without this message. It could be cause only by the old connect syntax. Something wrong with your code.

[diniamo]

Could it be with the way I add the dependency? Because it feels kinda wrong. That's the only thing I can think of at this point, since the HotkeyTest example works.

Cmake code:

find_library(QHOTKEY_LIBRARY NAMES qhotkey1 QHotkey1 HINTS "${CMAKE_PREFIX/lib}")
target_link_libraries(QuickScreenshot PRIVATE ${QHOTKEY_LIBRARY})

[Shatur]

Because it feels kinda wrong. That's the only thing I can think of at this point, since the HotkeyTest example works.

You probably using it wrong. Try this one:

cmake_minimum_required(VERSION 3.16)

project(project LANGUAGES CXX)

include(FetchContent)

option(QHOTKEY_INSTALL OFF)
FetchContent_Declare(QHotkey
    GIT_REPOSITORY https://github.com/Skycoder42/QHotkey
    GIT_TAG 1.4.2
)
FetchContent_MakeAvailable(QHotkey)

add_executable(${PROJECT_NAME} main.cpp)
target_link_libraries(${PROJECT_NAME} PRIVATE QHotkey::QHotkey)

[diniamo]

Oh I can do that? huh lemme try

[diniamo]

It's trying to search for Qt5 for some reason.

  By not providing "FindQt5.cmake" in CMAKE_MODULE_PATH this project has
  asked CMake to find a package configuration file provided by "Qt5", but
  CMake did not find one.

  Could not find a package configuration file provided by "Qt5" with any of
  the following names:

    Qt5Config.cmake
    qt5-config.cmake

  Add the installation prefix of "Qt5" to CMAKE_PREFIX_PATH or set "Qt5_DIR"
  to a directory containing one of the above files.  If "Qt5" provides a
  separate development package or SDK, be sure it has been installed.

[Shatur]

It's trying to search for Qt5 for some reason.

Clearly CMake can't find Qt5 for you.

[diniamo]

That's because I use Qt6 lol.

[Shatur]

Then you maybe want to set QT_MAJOR to 6?

https://github.com/Skycoder42/QHotkey/blob/1114df5081f2cda334531ac664c7434c13dccfe6/CMakeLists.txt#L11

[diniamo]

Erm... how do I do that though? Since that's in the github repo

[Shatur]

Erm... how do I do that though? Since that's in the github repo

How about to put set(QT_MAJOR 6) in your CMakeLists.txt before including QHotkey?

[diniamo]

nop, same thing

[Shatur]

Are you aware that you should put it before FetchContent_MakeAvailable?

[Shatur]

Or try this one: set(QT_MAJOR 6 CACHE STRING "Use Qt6")

[diniamo]

Are you aware that you should put it before FetchContent_MakeAvailable? Yes, and I did.

I'll try the other one in about an hour because I have to go.

[diniamo]

Or try this one: set(QT_MAJOR 6 CACHE STRING "Use Qt6")

doesn't seem to work either

[Shatur]

Have you tried clearing the cache?

[diniamo]

If by that you mean clean & build. I just did. Same thing.

[Shatur]

No, I mean CMakeCache.txt.

[diniamo]

Nope, doesn't seem to do anything.

[Shatur]

I don't have much information to understand what are you trying. But you need to find a way to override this variable.

[diniamo]

The default qt script uses the variable called QT_VERSION_MAJOR so it doesn't make sense why I need this one. And I'm trying what you told me but it doesn't seem to do a thing.

[Shatur]

The default qt script uses the variable called QT_VERSION_MAJOR so it doesn't make sense why I need this one.

Because this won't work with old Qt versions.

And I'm trying what you told me but it doesn't seem to do a thing.

I just guessing. You are not providing enough information for me to help you.

[diniamo]

Well tell me what I should tell you then?

[Shatur]

Try to provide a concrete steps. You need to overwrite QT_MAJOR if you going to use FetchContent.

[diniamo]

set(QT_MAJOR 6)
set(QT_MAJOR 6 CACHE STRING "Use Qt6")
#find_library(QHOTKEY_LIBRARY NAMES qhotkey1 QHotkey1 HINTS "${CMAKE_PREFIX}/lib")
include(FetchContent)
option(QHOTKEY_INSTALL OFF)
FetchContent_Declare(QHotkey
    GIT_REPOSITORY https://github.com/Skycoder42/QHotkey
    GIT_TAG 1.4.2
)
FetchContent_MakeAvailable(QHotkey)

This is what I was trying. The 2 set function calls weren't used at the same time of course.

[Shatur]

Thanks! Could you try to manually edit QHotkey's CMakeLists.txt (located under _deps/qhotkey-src in your build folder)? I would try to remove CACHE. Then you need to remove CMakeCache.txt from your build folder.

[diniamo]

Which of the set calls should I use though?

[Shatur]

I would go with set(QT_MAJOR 6). And try to remove CACHE parameter from the set from QHotkey. We will update the repo if it fixes your issue.

[Shatur]

I think i found the issue and fixed it. Try this one:

include(FetchContent)

set(QT_DEFAULT_MAJOR_VERSION 6)
option(QHOTKEY_INSTALL OFF)
FetchContent_Declare(QHotkey
    GIT_REPOSITORY https://github.com/Skycoder42/QHotkey
    GIT_TAG 1.5.0
)
FetchContent_MakeAvailable(QHotkey)

[diniamo]

Hm okay that compiles, the warning doesn't appear anymore. But I still don't get the print message.

[Shatur]

Perhaps you have other applications running that intercept this hotkey?

[diniamo]

Okay so changing it to another key, or example it works

[diniamo]

which you can clearly see from me leaving out the Fs in that message lol

[diniamo]

Perhaps you have other applications running that intercept this hotkey?

I had one but I closed that.

[diniamo]

I went through all the trouble of setting this up, and the one key I need doesn't work.. :b

[diniamo]

Guess I'll just implement this with a different hotkey until we find a solution...

[Shatur]

I checked it myself, I can reproduce it on Windows. But it works on Linux.

[diniamo]

So does that mean it's not gonna get fixed?

[Shatur]

I am not familiar with Windows API and cannot tell what the problem might be. But pull requests are welcome.

[diniamo]

Yeah well, I might try to look into it, I don't feel like I'm smart enough for windows api tho lol

Anyways, thank you for the help, let's keep this issue open then.

[diniamo]

Okay so, I found out that it might be qt's fault or something, because I can't even enter print screen in a QKeySequenceEdit.