Icons from resource file not showing

[saber]

I am in linux.And i am using Qt 5.9
I found this app's source code from git hub.
Creator of this app, include icon from the system theme .
In this app i included a resource file and select a push button's icon from the resource file that i include.
It shows in Qt creator ,but shwoing blank Pushbutton after build.I deleted every code that named theme and icon,but no change.
Icon from system theme shows after build .But icon selected from resource file are not showing.
What i can do to show icon from my resource file??
What code do i remove to not show icon from system theme?

[Vinod Kuntoji]

@saber

Delete your build folder. Clean your project, qmake and build and then run your project.

[saber]

I did it .but no change.
I think it is in code to select the icon from theme.
the app is "lximage-qt"

[Vinod Kuntoji]

@saber ,
Show me your code

[saber]

@Vinod-Kuntoji
thanks for help.
as a new user in the forum ,i can't upload a zip folder.
here is the cmake file of it.
https://forum.qt.io/topic/85016/convert-cmake-file-to-qmake

and here is the original code.from github
https://github.com/lxde/lximage-qt

[SGaist]

Hi,

Please show the content of your .qrc file and the part of the code where you load the icons.

[saber]

Here is the qrc file

I use this code first

  QPixmap iu("<:/icons/before.png>");
   ui.cNext->setIcon(iu);

But not showing the icon.
so i apply the icons from designer
and also see the output .the icon is not showing in after build.

thanks.

[joeQ]

@saber hi,friend.welcome.

try following snippet:

ui->pushButton->setIcon(QIcon(":/icons/left.ico"));

or

ui->pushButton->setIcon(QIcon("qrc:/icons/left.ico"));

[saber]

as i am using qt 5 i used
ui.cPrevious->setIcon(QIcon("qrc:/icons/left.ico"));

but no result.I don't understand .It should work with code and designer.
i think writer of this code made something to take only select the icone from system theme.

[joeQ]

@saber hi, you use cmake. maybe some error in cmake. like source path not set right.

if use qmake, my snippet code is ok. you can check the the path in cmake.

or To try the absolute path. like following snippet:

QPixmap pix;
if(pix.load("absolute icon path")){
    qDebug("icon load ok");
    QIcon ico(pix);
    ui->btn->setIcon(ico);
}

[saber]

@joeQ
nothing.
please can u see my post to convert it cmake file to qmake.
i think it will solve the problem.
https://forum.qt.io/topic/85016/convert-cmake-file-to-qmake