Icon for linux application

[Christian Ehrlicher]

@Joe-von-Habsburg said in Icon for linux application:

I've worked this hard on Qt in Ubuntu before

You're aware that the rc application icon is for windows??? Please read the full thread.

[Joe von Habsburg]

Ok, I am sorry, I read : https://forum.qt.io/topic/102167/how-to-add-qt-application-icon-in-ubuntu
I need both of them also, .destop file and QMainWindow::setWindowIcon().

I create icon.destop file and add resouces.qrc and add also to build folder.
My file :

[Desktop Entry]
Version=1.0
Type=Application
Name=MyApp
Icon=Resources/icon/icon.png
Exec=MyApp
Comment=MyApp Application
Categories=Application
Terminal=false

I could not see any thing.
And QMainWindow::setWindowIcon(). not work.

I checked, is icon null, it is return false. icon is not null.

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    QIcon ic(":/Resources/icon/icon.png");
    qDebug() << "ic.isNull" << ic.isNull(); // return false
    QMainWindow::setWindowIcon(QIcon(":/Resources/icon/icon.png"));
}

Did I create .destop file correct location ?

[JonB]

@Joe-von-Habsburg said in Icon for linux application:

Icon=Resources/icon/icon.png

QIcon ic(":/Resources/icon/icon.png");

The first looks in the filing system for Resources/icon/icon.png, which doesn't exist. I do not think you can tell desktop to use a resource in a Qt executable, or I don't know how if you can (unless :/Resources/icon/icon.png works which I doubt). For the desktop shortcut I imagine you have to extract or copy the png file so you can point to that.

[Joe von Habsburg]

@JonB said in Icon for linux application:

Icon=Resources/icon/icon.png

thay are in same directory.

• icon.destop

• Resources/

I added on project location and build location. So it exists.

@JonB said in Icon for linux application:

I do not think you can tell desktop to use a resource in a Qt executable,

I know what you mean. You think I'm using a file in resources.qrc, but I copied Resources/icon/icon.png to the build folder myself. So I know you can't use it from the .qrc file, it's inside the icon.desktop file.

@JonB said in Icon for linux application:

QIcon ic(":/Resources/icon/icon.png");

That was for mainwindow icon. I tested for access to icon.png file or it is null, app can access to file because it returns as false for ask is it null.

[JonB]

@Joe-von-Habsburg
I do not understand your English or what you are saying.

.qrc is not relevant, it is only used at compilation time. Ubuntu/desktop will not look for Icon=Resources/icon/icon.png as an embedded resource within your executable, nor if you specify it as any Icon=:/... like you can inside Qt code.

Let's say your home directory is /home/joe. Copy icon.png to that directory, so /home/joe/icon.png. Specify Icon=/home/joe/icon.png in .desktop file. Try that. If that does not work then perhaps you have something wrong in your .desktop file.

[Joe von Habsburg]

@JonB said in Icon for linux application:

I do not understand your English or what you are saying.

Sorry for that.

@JonB said in Icon for linux application:

Let's say your home directory is /home/joe. Copy icon.png to that directory, so /home/joe/icon.png. Specify Icon=/home/joe/icon.png in .desktop file. Try that. If that does not work then perhaps you have something wrong in your .desktop file.

I said that. I copied the image same directory(build) with .desktop file.

[JonB]

@Joe-von-Habsburg said in Icon for linux application:

I said that. I copied the image same directory(build) with .desktop file.

It's quite simple. I suggested you:

1. Copy icon.png to /home/joe/icon.png (whatever your home directory is).
2. Put Icon=/home/joe/icon.png (that's whatever full path) in .desktop file.

I don't know what your screenshot is supposed to be showing me. I never said to put anything anywhere near a Resources directory or in your "build" area. And your .desktop file is in somewhere like ~/.local/share/applications/, right?

[Joe von Habsburg]

I add to home

Build directory

[Desktop Entry]
Version=1.0
Type=Application
Name=App
Icon=/home/x/icon.png
Exec=myapp
Comment=My Application
Categories=Application
Terminal=false

Icon is :

I saw that

@JonB said in Icon for linux application:

desktop file is in somewhere like ~/.local/share/applications/, right?

should i create .destop file in there ?

[JonB]

@Joe-von-Habsburg
As I understand it, your icon.desktop file seems to be in some build directory. I said you should have nothing to do with build directory at runtime. What makes you think Ubuntu/GNOME will look in your build directory for any .desktop file, why should it? It does not even know it is there.

1. Put your icon.png in /home/joe.
2. Leave your icon executable in something like /home/joe/iconproject/build/Desktop/ directory. (I assume your executable is named icon.)
3. Ensure icon.desktop includes the following 2 lines among its other content:

Icon=/home/joe/icon.png
Exec=/home/joe/iconproject/build/Desktop/icon

4. Put/copy icon.desktop to directory /home/joe/.local/share/applications/. That is where Ubuntu/GNOME/desktop manager looks for .desktop files. You might have some more there if you have any other applications with .desktop files, or your might be the only one.

You might have to log out of desktop and back in again after you have done item #4, to make GNOME look in /home/joe/.local/share/applications/ again for your new icon.desktop file.

When you have this working you can think again/play with lines

Icon=/home/joe/icon.png
Exec=/home/joe/iconproject/build/Desktop/icon

so that they do not necessarily have to have /home/joe in them if you want this to run/distribute elsewhere. But first get it working with the absolute paths so we know where we are.

[Joe von Habsburg]

Thank you so much, It works. For that kind of things, must be so explanatory. Thanks everyone :)