Problems with QPushButton displaying an icon

[John82]

Hi

I tried initializing a QPushButton with an icon ( image file in the resource file ). But the button is not displaying the icon. I have tried changing the layout direction. I also checked the icon size and it is giving me a size of 16 x 16. The original icon size is 40 x 34. So I am assuming that the icon has been assigned to the push button but it is not being displayed. Does anyone out there have any ideas?

Thanks

[Lykurg]

Can we see your code? Probably you have an error in your file, and have you bind the resource file to your application properly?

[John82]

The code is simple :

QPushButton* button = new QPushButton (QIcon (":/options.png"), tr ("Options"), this);

QPushButton* button = new QPushButton (QIcon (":/options.png"), tr ("Options"), this);

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As far as binding is concerned, I am using Visual Studio.net with Qt integration and the resource file (.qrc) does have the above mentioned icon.

Thanks

[IRON_MAN]

Try like this:

QPixmap buttonImage("argazkiak/flecha.bmp");
QIcon Icon;
Icon.addPixmap ( buttonImage, QIcon::Normal, QIcon::Off );
QPushButton *Button = new QPushButton();
Button->setIcon(Icon);
Button->setIconSize(QSize(100,100));

QPixmap buttonImage("argazkiak/flecha.bmp");
QIcon Icon;
Icon.addPixmap ( buttonImage, QIcon::Normal, QIcon::Off );
QPushButton *Button = new QPushButton();
Button->setIcon(Icon);
Button->setIconSize(QSize(100,100));

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[Lykurg]

Are you using other resource files without any problem?
what does

QPixmap p(":/options.png");
qWarning() << p.isNull();

QPixmap p(":/options.png");
qWarning() << p.isNull();

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say?

[John82]

Are you using other resource files without any problem?
what does

QPixmap p(":/options.png");
qWarning() << p.isNull();

QPixmap p(":/options.png");
qWarning() << p.isNull();

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say?

I checked out your code and yes I think I am having problems with the resource file. QPixmap is giving me a null value; though I don't know why.

[Lykurg]

and yes I think I am having problems with the resource file.

1. How does your main function look like (Q_INIT_RESOURCE?)
2. did you use prefixes in your qrc file?

[John82]

I did not use Q_INIT_RESOURCE earlier because I thought it would be loaded automatically. After adding the line I am now facing a new error while compilation. It is giving me an "unresolved external symbol" error.

Error message :

unresolved external symbol "int __cdecl qInitResources_project(void)" (?qInitResources_project@@YAHXZ) referenced in function _main

My resource file is stored in a folder called Resources.

Contents :

<RCC>
<qresource prefix="Project">
<file>options.png</file>
</qresource>
</RCC>

Main function :

int main (int argc, char* argv[])
  {
    Q_INIT_RESOURCE (project);
 
    // Create a QApplication with passed arguments
    QApplication app (argc, argv);
 
    // Create the main program window
    MainWindow mw;
 
    // Main window geometry management 
    int width = 800;
    int height = 640;
 
    // Show the main window. 
    mw.show();
 
    return app.exec();
  }

int main (int argc, char* argv[])
  {
    Q_INIT_RESOURCE (project);

    // Create a QApplication with passed arguments
    QApplication app (argc, argv);

    // Create the main program window
    MainWindow mw;

    // Main window geometry management 
    int width = 800;
    int height = 640;

    // Show the main window. 
    mw.show();
 
    return app.exec();
  }

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[Lykurg]

Q_INIT_RESOURCE (project);

Q_INIT_RESOURCE (project);

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If you use that, your resource file has to be named project.qrc. And you are using a prefix so also ":/options.png" is wrong. I suggest you read this first.

[John82]

My resource file is named "project". After some trial and error, I got the code to work. It seems every time I add files to the .qrc file, I have to reload it in Visual studio. So icons are being read now. Thanks for the help!!