[SOLVED] QSystemTrayIcon icon from resource file isn't showing

[ambershark]

It tries to scale images, but it you were using a really crazy size it may exhibit behavior like that. What happens if you do this:

QLabel *label = new QLabel();
label->setPixmap(QPixmap(":/images/appicon.png");
label->show();

If it shows there then you may have an issue with it being converted to a QIcon in which case I would check your sizing of the image. I.e. try to get it no more than like 32x32 for that area since it is going to scale down to 16x16 more than likely.

[nitzan]

Well, doing that was a bit over my Qt skills (controlling qml from c++), but I tried using a different image.
I created a 16x16 one color png, added that to the resource file and tried using that, but once again to no avail.
So it's probably not the image I was trying to use, but a problem with the resources or how I try to fetch them.

Any ideas?
Thanks.

[ambershark]

@nitzan I just noticed in your resource file you don't have a prefix. Maybe try the following qrc file:

<!DOCTYPE RCC>
<RCC version="1.0">
    <qresource prefix="/">
        <file>images/appicon.png</file>
    </qresource>
</RCC>

Notice that prefix="/" on <qresource>.

I also removed the alias so there isn't any issue there. Then in your load code do:

trayIcon->setIcon(QIcon(":/images/appicon.png"));

I think that might work. If not let me know any I'll write up a quick example that does work and send you the code and you can compare it to yours and figure out what is missing. :)

[nitzan]

I added the prefix and it had no effect.
Here's my current code.

Resource file:

<!DOCTYPE RCC>
<RCC version="1.0">
    <qresource prefix="/">
        <file>images/appicon.png</file>
        <file>images/simpleIcon.png</file>
    </qresource>
</RCC>

cpp file:

QAction* quitAction = new QAction(QIcon(":/images/appicon.png"), QObject::tr("&Quit"), &app);
app.connect(quitAction, SIGNAL(triggered()), qApp, SLOT(quit()));

QMenu* trayIconMenu = new QMenu();
trayIconMenu->addAction(quitAction);

QSystemTrayIcon* trayIcon = new QSystemTrayIcon();
trayIcon->setContextMenu(trayIconMenu);
trayIcon->setIcon(QIcon("qrc:/images/simpleIcon.png"));
trayIcon->show();

The appicon is the original icon, with an image which is 83x83, and the simpleIcon is just a 16x16 solid color image.
Both aren't showing.
Thanks.

[ambershark]

@nitzan Sorry, got a ton going on at work right now. I will be able to mess around with your code a bit tomorrow probably and I'll let you know what I find out.

[nitzan]

Something weird happened.
I haven't changed anything but now I do see an icon in the QAction, but not in the tray, even if I use the same exact object, like so:

QIcon icon(":/images/appicon.png");
QAction* quitAction = new QAction(&icon, QObject::tr("&Quit"), &app);
...
QSystemTrayIcon* trayIcon = new QSystemTrayIcon();
trayIcon->setIcon(&icon);
...

No idea what causes the icon to show up all of the sudden in the QAction, but fine, whatever..
The question is why will the icon show up there but not in the tray?

Thanks.

[ambershark]

That sounds like a build issue. Try making sure your build environment is totally clean and rebuild. Check out a fresh copy from source control even. Or at a bare minimum make distclean then make.

See if that resolves your icon issues.

I'll still play with your code in a bit, just haven't had time yet.

[nitzan]

You're right, it's a build issue.

Rebuilding it produced many errors it did not complain about before, meaning that all of the last time I clicked the run button did not really compile my changed code and I kept checking the same thing.

Now it's stuck on

qtmaind.lib(qtmain_win.obj):-1: error: LNK2019: unresolved external symbol _main referenced in function _WinMain@16

No matter what I do, I tried running qmake, cleaning all and rebuilding all but nothing seems to make it want to recompile my changed code.
There's nothing to check out, it's a completely new project with the minimum of code I posted.

[ambershark]

Ok then this is probably not an icon issue with systray. In fact one of the suggestions above probably fixed it but we never knew because of the build issues.

So moving on to the build issues:

1. Can you show me your *.pro file?
2. What OS are you using?
3. What IDE are you using since you said "clicked run" before I'm assuming you aren't using the command line. :)
4. What compiler are you using?

[nitzan]

Yes, you are correct again.
I created a new project and copied just the icon related code and the icon does appear now in the tray.

As for the build issue:
I'm developing on windows 8.1, using the Qt Creator (as I can't seem to find an addin to visual studio 2013 (I found this: http://download.qt.io/official_releases/vsaddin/qt-vs-addin-1.2.4-opensource.exe.mirrorlist but it won't run on my machine).
But it uses the VS2013 compiler.

Here's my .pro file:

TEMPLATE = app

QT += qml quick widgets

HEADERS += source/*.h
SOURCES += source/*.cpp

RESOURCES += qml.qrc \
	images.qrc

# Additional import path used to resolve QML modules in Qt Creator's code model
QML_IMPORT_PATH =

# Default rules for deployment.
include(deployment.pri)

DISTFILES += \
	images/appicon.png

#win32:CONFIG(release, debug|release): LIBS += -L$$PWD/../../CEF/cef_binary_3.2357.1280.geba024d_windows32/release/ -llibcef
#else:win32:CONFIG(debug, debug|release): LIBS += -L$$PWD/../../CEF/cef_binary_3.2357.1280.geba024d_windows32/debug/ -llibcef

#INCLUDEPATH += $$PWD/../../CEF/cef_binary_3.2357.1280.geba024d_windows32
#DEPENDPATH += $$PWD/../../CEF/cef_binary_3.2357.1280.geba024d_windows32

#win32-g++:CONFIG(release, debug|release): PRE_TARGETDEPS += $$PWD/../../CEF/cef_binary_3.2357.1280.geba024d_windows32/release/liblibcef.a
#else:win32-g++:CONFIG(debug, debug|release): PRE_TARGETDEPS += $$PWD/../../CEF/cef_binary_3.2357.1280.geba024d_windows32/debug/liblibcef.a
#else:win32:!win32-g++:CONFIG(release, debug|release): PRE_TARGETDEPS += $$PWD/../../CEF/cef_binary_3.2357.1280.geba024d_windows32/release/libcef.lib
#else:win32:!win32-g++:CONFIG(debug, debug|release): PRE_TARGETDEPS += $$PWD/../../CEF/cef_binary_3.2357.1280.geba024d_windows32/debug/libcef.lib

As can be seen, I added a library (chromium embedded framework) but after reading about how that error is caused when adding additional libs I commented it out, but still that error would not go away.
It's probably something to do with the Qt Creator which caches things?

[nitzan]

Ok, I finally managed to get everything working!

What I did was to set the Default build directory to . instead of what it has there, and I unchecked the Use jom instead of nmake box.
Now it seems to actually rebuilding the up to date code.

Thanks for all the help!

[ambershark]

Good, glad ya got it sorted out. Sorry I've been super busy lately and haven't lurked the forums here. :)