+ Reply to Thread
Page 1 of 2 12 LastLast
Results 1 to 20 of 22

Thread: Image resources (png, ico) not rendering in app

  1. #1
    Join Date
    Aug 2010
    Posts
    99
    Thanks
    3
    Qt products
    Qt4
    Platforms
    Windows

    Default Image resources (png, ico) not rendering in app

    Hello,

    I'm having a problem with my Qt app where none of the icons show when the app is ran. I haven't worked on it in a while, but I know it used to work. It must have stopped working when I upgraded from Qt 4 to 5.
    I have created a .qrc file, and all the images are in there. I can also see the "RCC'ing" line in the compile output, so it seems to be compiling the resources correctly. But when I run the app, all the buttons are blank and there are no icons in the menu items. Even the image on the about dialog is not showing.

    Here are some details:
    Qt 5.1.0
    Visual Studio 2010
    VS Addin 1.2.2
    Windows 7, 64bit

    I'm not seeing anything in the debug output, and I don't know where to start looking. Can someone please advise how I can debug this issue?

    thanks
    [Window Detective] - Windows UI spy utility
    [War Thunder]

  2. #2
    Join Date
    Jul 2016
    Posts
    13
    Thanks
    7
    Qt products
    Qt5
    Platforms
    Unix/X11 Windows

    Default Re: Image resources (png, ico) not rendering in app

    Hello,
    Can you show us your qrc file and some lines of code where you create an icon that doesn't work ?

  3. #3
    Join Date
    Aug 2010
    Posts
    99
    Thanks
    3
    Qt products
    Qt4
    Platforms
    Windows

    Default Re: Image resources (png, ico) not rendering in app

    My qrc file is just your basic list of files:
    Qt Code:
    1. <RCC>
    2. <qresource prefix="/">
    3. <file>Window Detective.ico</file>
    4. <file>img/picker.png</file>
    5. <file>img/preferences.png</file>
    6. <file>img/find.png</file>
    7. <file>img/window_large.png</file>
    8. ...
    9. </qresource>
    10. </RCC>
    To copy to clipboard, switch view to plain text mode 

    The button icons are specified in the .ui files. Qt Designer correctly shows all the icons.

    I'm currently looking at the code which loads the image for the About dialog.
    Qt Code:
    1. void AboutDialog::setupUi() {
    2. ...
    3. mainFrame = new QFrame(this);
    4. mainFrameLayout = new QHBoxLayout(mainFrame);
    5. mainFrameLayout->setContentsMargins(10, 10, 0, 0);
    6. leftFrame = new QFrame(mainFrame);
    7. leftFrame->setMinimumSize(QSize(128, 0));
    8. windowImageLabel = new QLabel(leftFrame);
    9. QPixmap windowImage(":img/window_large.png");
    10. windowImageLabel->setGeometry(QRect(QPoint(7, 24), windowImage.size()));
    11. windowImageLabel->setMinimumSize(windowImage.size());
    12. windowImageLabel->setMaximumSize(windowImage.size());
    13. windowImageLabel->setPixmap(windowImage);
    14. mainFrameLayout->addWidget(leftFrame);
    15. ...
    16. }
    To copy to clipboard, switch view to plain text mode 

    Stepping into the qpixmap.cpp code, I can see it's getting QFileInfo and returning false because the file does not exist. Something about the resource not being valid in QResourceFileEngine::fileFlags.
    [Window Detective] - Windows UI spy utility
    [War Thunder]

  4. #4
    Join Date
    Jan 2008
    Location
    Alameda, CA, USA
    Posts
    3,080
    Thanks
    190
    Thanked 484 Times in 475 Posts
    Qt products
    Qt5
    Platforms
    Unix/X11 Windows Android

    Default Re: Image resources (png, ico) not rendering in app

    Try using ":/img/window_large.png". From the documentation for resource files:

    Resource Collection Files (.qrc)

    The resources associated with an application are specified in a .qrc file, an XML-based file format that lists files on the disk and optionally assigns them a resource name that the application must use to access the resource.

    Here's an example .qrc file:

    <!DOCTYPE RCC><RCC version="1.0">
    <qresource>
    <file>images/copy.png</file>
    <file>images/cut.png</file>
    <file>images/new.png</file>
    <file>images/open.png</file>
    <file>images/paste.png</file>
    <file>images/save.png</file>
    </qresource>
    </RCC>

    The resource files listed in the .qrc file are files that are part of the application's source tree. The specified paths are relative to the directory containing the .qrc file. Note that the listed resource files must be located in the same directory as the .qrc file, or one of its subdirectories.

    Resource data can either be compiled into the binary and thus accessed immediately in application code, or a binary resource can be created and at a later point in application code registered with the resource system.

    By default, resources are accessible in the application under the same file name as they have in the source tree, with a :/ prefix, or by a URL with a qrc scheme.
    For example, the file path :/images/cut.png or the URL qrc:///images/cut.png would give access to the cut.png file, whose location in the application's source tree is images/cut.png.
    Please use CODE tags when posting source code so it is more readable. Click "Go Advanced" and then the "#" icon to insert the tags. Paste your code between them.

  5. #5
    Join Date
    Aug 2010
    Posts
    99
    Thanks
    3
    Qt products
    Qt4
    Platforms
    Windows

    Default Re: Image resources (png, ico) not rendering in app

    Oh, with a leading slash after the colon? I'll try that.
    I suppose that was something that changed in Qt 5, because it used to work with just the colon.
    [Window Detective] - Windows UI spy utility
    [War Thunder]

  6. #6
    Join Date
    Aug 2010
    Posts
    99
    Thanks
    3
    Qt products
    Qt4
    Platforms
    Windows

    Default Re: Image resources (png, ico) not rendering in app

    Unfortunately, that didn't work. Many of the other images in my project are already referenced with a leading slash (e.g. ":/img/something.png").

    I traced execution into the QResourcePrivate::load function, and res->findNode() always returns -1. It would seem as though the resources aren't being loaded.

  7. #7
    Join Date
    Jan 2006
    Location
    Graz, Austria
    Posts
    8,068
    Thanks
    35
    Thanked 1,460 Times in 1,415 Posts
    Qt products
    Qt3 Qt4 Qt5
    Platforms
    Unix/X11 Windows

    Default Re: Image resources (png, ico) not rendering in app

    You can use QDir or QDirIterator on ":/" to look into and traverse the resource "file system".

    Or the resource inspector of GammaRay

    Cheers,
    _

  8. The following user says thank you to anda_skoa for this useful post:

    xtal256 (15th February 2017)

  9. #8
    Join Date
    Aug 2010
    Posts
    99
    Thanks
    3
    Qt products
    Qt4
    Platforms
    Windows

    Default Re: Image resources (png, ico) not rendering in app

    Quote Originally Posted by anda_skoa View Post
    Or the resource inspector of GammaRay
    Dude, that looks amazing! It's sort of like what my application is to Windows, but better
    It should definitely help me in debugging Qt issues.

    thanks

  10. #9
    Join Date
    Aug 2010
    Posts
    99
    Thanks
    3
    Qt products
    Qt4
    Platforms
    Windows

    Default Re: Image resources (png, ico) not rendering in app

    I used the following code to print all resources:
    Qt Code:
    1. QDirIterator it(":/", QDirIterator::Subdirectories);
    2. while (it.hasNext()) {
    3. qDebug() << it.next();
    4. }
    To copy to clipboard, switch view to plain text mode 
    But none of my images were there. Just a bunch of default Qt resources. So it's clear that the resources are not even getting into the build. They are definitely all there in the .qrc file, and I touched it to make sure the build would run RCC on it.
    [Window Detective] - Windows UI spy utility
    [War Thunder]

  11. #10
    Join Date
    Jan 2006
    Location
    Graz, Austria
    Posts
    8,068
    Thanks
    35
    Thanked 1,460 Times in 1,415 Posts
    Qt products
    Qt3 Qt4 Qt5
    Platforms
    Unix/X11 Windows

    Default Re: Image resources (png, ico) not rendering in app

    Hmm, is your resource part of the application or a library?

    I.e. is it in the RESOURCES variable of the .pro file that generates the main executable?

    Cheers,
    _

  12. #11
    Join Date
    Aug 2010
    Posts
    99
    Thanks
    3
    Qt products
    Qt4
    Platforms
    Windows

    Default Re: Image resources (png, ico) not rendering in app

    I don't have a .pro file, I'm using the VS add-in to handle the build. I suspect that I just haven't configured it right, but I don't know exactly how it works. All I know is that it is definitely processing the .qrc file, but obviously it isn't picking up the images and compiling them into the app.

  13. #12
    Join Date
    Jan 2008
    Location
    Alameda, CA, USA
    Posts
    3,080
    Thanks
    190
    Thanked 484 Times in 475 Posts
    Qt products
    Qt5
    Platforms
    Unix/X11 Windows Android

    Default Re: Image resources (png, ico) not rendering in app

    The more important part of anda_skoa's question is whether the resources you are trying to use are in your app EXE or if they are in a DLL you are dynamically loading into your app. If they are in a DLL, you'll need to put a Q_INIT_RESOURCE() macro in main() after your QApplication instance is declared so it will load them properly:

    Qt Code:
    1. QApplication app( argc, argv );
    2.  
    3. Q_INIT_RESOURCE( MyDLL );
    To copy to clipboard, switch view to plain text mode 

    (assuming your DLL is named "MyDLL.dll")

    In Visual Studio, right-click on your qrc file name in the Solution Browser and go to the General properties page. It should look something like the attached screenshot; basically, it should be running rcc on the resource file and putting something in the GeneratedFiles directory.

    Capture.jpg
    Last edited by d_stranz; 16th February 2017 at 03:35.
    Please use CODE tags when posting source code so it is more readable. Click "Go Advanced" and then the "#" icon to insert the tags. Paste your code between them.

  14. #13
    Join Date
    Aug 2010
    Posts
    99
    Thanks
    3
    Qt products
    Qt4
    Platforms
    Windows

    Default Re: Image resources (png, ico) not rendering in app

    It's in my app's exe, not a dll.

    But I think the problem is that the properties that are not correct.
    Comparing my property window to your screenshot, the only difference is that my "Additional Dependencies" doesn't list any of the image files like yours does. It just has "%(FullPath);%(AdditionalInputs)". I don't know what %(AdditionalInputs) is.

    However, even when I change "Additional Dependencies" to include all my images (using relative paths, like in your screenshot), it still doesn't work. I even tried touching one of the images thinking maybe the incremental build was skipping over them, but nope.

    Here is the build output, at "diagnostic" verbosity.

  15. #14
    Join Date
    Mar 2008
    Location
    Kraków, Poland
    Posts
    1,297
    Thanked 239 Times in 235 Posts
    Qt products
    Qt4
    Platforms
    Unix/X11 Windows

    Default Re: Image resources (png, ico) not rendering in app

    Try to remove all qrc_*.cpp files from GeneratedFiles folder and then build the project.
    If this work something is wrong with the qrc file definition in the project.

  16. #15
    Join Date
    Jan 2017
    Posts
    21
    Thanks
    2
    Qt products
    Qt5
    Platforms
    Windows

    Default Re: Image resources (png, ico) not rendering in app

    I had the same problem. Try to uncheck "Shadow build" in "Projects".

  17. #16
    Join Date
    Jan 2008
    Location
    Alameda, CA, USA
    Posts
    3,080
    Thanks
    190
    Thanked 484 Times in 475 Posts
    Qt products
    Qt5
    Platforms
    Unix/X11 Windows Android

    Default Re: Image resources (png, ico) not rendering in app

    I had the same problem. Try to uncheck "Shadow build" in "Projects".
    The OP is using Visual Studio, not Qt Creator. VS has no explicit concept of shadow builds although it does allow you to set various output and intermediate directories so you can do an out-of-source build in the same way as a shadow build.

    I doubt this is the OP's problem. It is probably a dependency issue - maybe the resource files are being excluded from the build because of some VS property setting.
    Please use CODE tags when posting source code so it is more readable. Click "Go Advanced" and then the "#" icon to insert the tags. Paste your code between them.

  18. #17
    Join Date
    Aug 2010
    Posts
    99
    Thanks
    3
    Qt products
    Qt4
    Platforms
    Windows

    Default Re: Image resources (png, ico) not rendering in app

    I get the feeling that I'm doing something incredibly stupid, like I've actually fixed the problem somehow but I'm accidentally looking at an old exe so I keep seeing the problem. But that can't be it, as I usually run using F5 in Visual Studio. I've done a full clean & build numerous times. I've touched the qrc and image files to make sure the build picks them up. I've done everything I can think of.

    When I ran the build with diagnostic verbosity, it didn't give any more information for the RCC'ing stage. Is there a way I can configure Qt's build process to output more detailed information? Perhaps it can tell me whether or not it's reading the image files. Actually, procmon might come in handy.

  19. #18
    Join Date
    Jan 2008
    Location
    Alameda, CA, USA
    Posts
    3,080
    Thanks
    190
    Thanked 484 Times in 475 Posts
    Qt products
    Qt5
    Platforms
    Unix/X11 Windows Android

    Default Re: Image resources (png, ico) not rendering in app

    Try wiping out everything in the GeneratedFiles directory for whichever build type you are doing. I have found that sometimes the Qt VS plugin gets confused over this. I've sometimes had to manually edit the .vcxproj / .vcproj files to fix build options so that all the right files are being included and built.
    Please use CODE tags when posting source code so it is more readable. Click "Go Advanced" and then the "#" icon to insert the tags. Paste your code between them.

  20. #19
    Join Date
    Aug 2010
    Posts
    99
    Thanks
    3
    Qt products
    Qt4
    Platforms
    Windows

    Default Re: Image resources (png, ico) not rendering in app

    Ah, I just noticed "GeneratedFiles" in the Visual Studio tree. I thought you were talking about the build output directory (Visual Studio uses the names "Debug" and "Release"), but this one is different. It's not a directory, just a node in the project tree structure. And I don't see the rcc generated file in there, only the moc and ui files. I'll have to read up on how to use the VS add-in, I suspect it should have added the rcc file in there and that's the reason why it's not working.

  21. #20
    Join Date
    Jan 2008
    Location
    Alameda, CA, USA
    Posts
    3,080
    Thanks
    190
    Thanked 484 Times in 475 Posts
    Qt products
    Qt5
    Platforms
    Unix/X11 Windows Android

    Default Re: Image resources (png, ico) not rendering in app

    Hmmm - if things are working as they should, you should have an actual "GeneratedFiles" directory on disk at the same level as your source code. For my projects, the directory structure is typically:

    Qt Code:
    1. Solution root /
    2. Project root /
    3. Source *.cpp, *.h
    4. Debug / (for Win32 builds)
    5. GeneratedFiles /
    6. Debug /
    7. moc_*.cpp
    8. Release /
    9. moc_*.cpp
    10. qrc_<projectname>.cpp
    11. ui_*.cpp
    12. Release / (Win32 builds)
    13. Resources /
    14. *.png
    15. x64 /
    16. Debug /
    17. Release /
    To copy to clipboard, switch view to plain text mode 

    The qrc_<projectname>.cpp file is generated by RCC and is the conversion of your resources into binary strings to be compiled into your project.

    Maybe you need to reinstall the Qt VS Add-in?
    Please use CODE tags when posting source code so it is more readable. Click "Go Advanced" and then the "#" icon to insert the tags. Paste your code between them.

+ Reply to Thread

Similar Threads

  1. Replies: 4
    Last Post: 28th April 2014, 12:01
  2. load image from resources in library
    By stevocz in forum Newbie
    Replies: 0
    Last Post: 11th July 2013, 09:21
  3. Replies: 5
    Last Post: 10th October 2012, 21:05
  4. Replies: 2
    Last Post: 14th January 2012, 22:39
  5. Speeding up Image Rendering
    By reno77 in forum Newbie
    Replies: 2
    Last Post: 15th June 2010, 09:58

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts