Deployed program fails to load JPEG

closer_ex

Thanks for the suggestion, but could you show me how to redirect QT_DEBUG_PLUGINS output to a powershell window or a log file, when running the deployed program? I tried qInstallMessageHandler but it only logged null qpixmap warning.

However, running from Qt Creator gave the result that all plugins are loaded correctly and successfully:

Line 388: loaded library "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qgif.dll"
Line 389: loaded library "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qicns.dll"
Line 390: loaded library "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qico.dll"
Line 391: loaded library "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qjpeg.dll"
Line 392: loaded library "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qsvg.dll"
Line 393: loaded library "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qtga.dll"
Line 394: loaded library "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qtiff.dll"
Line 395: loaded library "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qwbmp.dll"
Line 396: loaded library "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qwebp.dll"
Line 554: loaded library "F:/Qt/5.15.0/msvc2019_64/plugins/platforms/qwindows.dll"
Line 625: loaded library "F:/Qt/5.15.0/msvc2019_64/plugins/styles/qwindowsvistastyle.dll"

I also tried loading qjpeg.dll manully by adding following code then compile&deploy(don't know if it's correct though):

QPluginLoader loader("./imageformats/qjpeg.dll");
if(!loader.load())
{
    QMessageBox::warning(nullptr, "warning", "qjpeg not loaded");
}

And the warning box showed up.

jsulm

@closer_ex

set QT_DEBUG_PLUGINS=1
myApp > myApp.log

Christian Ehrlicher

@closer_ex said in Deployed program fails to load JPEG:

F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qjpeg.dll

As you can see the library is loaded. There must be something else wrong are you sure the jpeg file exists on the deployed system. Check with QFile::exists()

closer_ex

@Christian-Ehrlicher
qjpeg.dll is loaded when running directly from Qt Creator, and the pictures show normally. Problem is the deployed one won't load it.

The reason for which I'm sure the file exists is that they are readed from music tag(mp3, flac for example), the music files can be loaded and played, the covers exist , and absolute paths are passed for both function.

Christian Ehrlicher

@closer_ex said in Deployed program fails to load JPEG:

qjpeg.dll is loaded when running directly from Qt Creator, and the pictures show normally. Problem is the deployed one won't load it.

Please read my post, I never asked you to try to load a plugin with QLibrary - it's simply useless what you're doing there.
You should check if the images exists on the deployed machine with QFile::exits()

closer_ex

@Christian-Ehrlicher
I DO read your posts, and I am saying the images exist on the deployed machine. QFile::exists() is called when I check for music info at program startup, and I am using absolute path in every case - info storing, parsing and saving.

This has been tested on different machines, and the first thing I did when this glitch came out is checking for file existence.

And I am not loading a plugin with QPluginLoader - it's just a blind try and have been discarded.

Christian Ehrlicher

Please convert the file to a png and see if it works then on your deployed machine. I still think the path may be wrong.
Also you did not post the output of QT_DEBUG_PLUGINS to see if the plugin can be really loaded.

closer_ex

@jsulm said in Deployed program fails to load JPEG:

@closer_ex

set QT_DEBUG_PLUGINS=1
myApp > myApp.log

I tried this but unfortunately the output file is 0 KB. I've set the environment variable and Qt Creator is producing plugin debug output.

@Christian-Ehrlicher said in Deployed program fails to load JPEG:

Please convert the file to a png and see if it works then on your deployed machine. I still think the path may be wrong.
Also you did not post the output of QT_DEBUG_PLUGINS to see if the plugin can be really loaded.

A few songs use png format cover and they are all loaded correctly, and I am also using a default png cover for those without a cover tag.

For the full QT_DEBUG_PLUGINS output:

11:18:32: Starting F:\QtProjects\build-QXGMusic-Desktop_Qt_5_15_0_MSVC2019_64bit-Release\release\QXGMusic.exe ...
QFactoryLoader::QFactoryLoader() checking directory path "F:/Qt/5.15.0/msvc2019_64/plugins/iconengines" ...
QFactoryLoader::QFactoryLoader() looking at "F:/Qt/5.15.0/msvc2019_64/plugins/iconengines/qsvgicon.dll"
Found metadata in lib F:/Qt/5.15.0/msvc2019_64/plugins/iconengines/qsvgicon.dll, metadata=
{
    "IID": "org.qt-project.Qt.QIconEngineFactoryInterface",
    "MetaData": {
        "Keys": [
            "svg",
            "svgz",
            "svg.gz"
        ]
    },
    "archreq": 0,
    "className": "QSvgIconPlugin",
    "debug": false,
    "version": 331520
}
Got keys from plugin meta data ("svg", "svgz", "svg.gz")
QFactoryLoader::QFactoryLoader() looking at "F:/Qt/5.15.0/msvc2019_64/plugins/iconengines/qsvgicond.dll"
Found metadata in lib F:/Qt/5.15.0/msvc2019_64/plugins/iconengines/qsvgicond.dll, metadata=
{
    "IID": "org.qt-project.Qt.QIconEngineFactoryInterface",
    "MetaData": {
        "Keys": [
            "svg",
            "svgz",
            "svg.gz"
        ]
    },
    "archreq": 1,
    "className": "QSvgIconPlugin",
    "debug": true,
    "version": 331520
}
"The plugin 'F:/Qt/5.15.0/msvc2019_64/plugins/iconengines/qsvgicond.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 
         not a plugin
QFactoryLoader::QFactoryLoader() checking directory path "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats" ...
QFactoryLoader::QFactoryLoader() looking at "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qgif.dll"
Found metadata in lib F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qgif.dll, metadata=
{
    "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
    "MetaData": {
        "Keys": [
            "gif"
        ],
        "MimeTypes": [
            "image/gif"
        ]
    },
    "archreq": 0,
    "className": "QGifPlugin",
    "debug": false,
    "version": 331520
}
Got keys from plugin meta data ("gif")
QFactoryLoader::QFactoryLoader() looking at "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qgifd.dll"
Found metadata in lib F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qgifd.dll, metadata=
{
    "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
    "MetaData": {
        "Keys": [
            "gif"
        ],
        "MimeTypes": [
            "image/gif"
        ]
    },
    "archreq": 1,
    "className": "QGifPlugin",
    "debug": true,
    "version": 331520
}
"The plugin 'F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qgifd.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qicns.dll"
Found metadata in lib F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qicns.dll, metadata=
{
    "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
    "MetaData": {
        "Keys": [
            "icns"
        ],
        "MimeTypes": [
            "image/x-icns"
        ]
    },
    "archreq": 0,
    "className": "QICNSPlugin",
    "debug": false,
    "version": 331520
}
Got keys from plugin meta data ("icns")
QFactoryLoader::QFactoryLoader() looking at "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qicnsd.dll"
Found metadata in lib F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qicnsd.dll, metadata=
{
    "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
    "MetaData": {
        "Keys": [
            "icns"
        ],
        "MimeTypes": [
            "image/x-icns"
        ]
    },
    "archreq": 1,
    "className": "QICNSPlugin",
    "debug": true,
    "version": 331520
}
"The plugin 'F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qicnsd.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qico.dll"
Found metadata in lib F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qico.dll, metadata=
{
    "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
    "MetaData": {
        "Keys": [
            "ico",
            "cur"
        ],
        "MimeTypes": [
            "image/vnd.microsoft.icon",
            "image/vnd.microsoft.icon"
        ]
    },
    "archreq": 0,
    "className": "QICOPlugin",
    "debug": false,
    "version": 331520
}
Got keys from plugin meta data ("ico", "cur")
QFactoryLoader::QFactoryLoader() looking at "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qicod.dll"
Found metadata in lib F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qicod.dll, metadata=
{
    "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
    "MetaData": {
        "Keys": [
            "ico",
            "cur"
        ],
        "MimeTypes": [
            "image/vnd.microsoft.icon",
            "image/vnd.microsoft.icon"
        ]
    },
    "archreq": 1,
    "className": "QICOPlugin",
    "debug": true,
    "version": 331520
}
"The plugin 'F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qicod.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qjpeg.dll"
Found metadata in lib F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qjpeg.dll, metadata=
{
    "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
    "MetaData": {
        "Keys": [
            "jpg",
            "jpeg"
        ],
        "MimeTypes": [
            "image/jpeg",
            "image/jpeg"
        ]
    },
    "archreq": 0,
    "className": "QJpegPlugin",
    "debug": false,
    "version": 331520
}
Got keys from plugin meta data ("jpg", "jpeg")
QFactoryLoader::QFactoryLoader() looking at "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qjpegd.dll"
Found metadata in lib F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qjpegd.dll, metadata=
{
    "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
    "MetaData": {
        "Keys": [
            "jpg",
            "jpeg"
        ],
        "MimeTypes": [
            "image/jpeg",
            "image/jpeg"
        ]
    },
    "archreq": 1,
    "className": "QJpegPlugin",
    "debug": true,
    "version": 331520
}
"The plugin 'F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qjpegd.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qsvg.dll"
Found metadata in lib F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qsvg.dll, metadata=
{
    "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
    "MetaData": {
        "Keys": [
            "svg",
            "svgz"
        ],
        "MimeTypes": [
            "image/svg+xml",
            "image/svg+xml-compressed"
        ]
    },
    "archreq": 0,
    "className": "QSvgPlugin",
    "debug": false,
    "version": 331520
}
Got keys from plugin meta data ("svg", "svgz")
QFactoryLoader::QFactoryLoader() looking at "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qsvgd.dll"
Found metadata in lib F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qsvgd.dll, metadata=
{
    "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
    "MetaData": {
        "Keys": [
            "svg",
            "svgz"
        ],
        "MimeTypes": [
            "image/svg+xml",
            "image/svg+xml-compressed"
        ]
    },
    "archreq": 1,
    "className": "QSvgPlugin",
    "debug": true,
    "version": 331520
}
"The plugin 'F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qsvgd.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qtga.dll"
Found metadata in lib F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qtga.dll, metadata=
{
    "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
    "MetaData": {
        "Keys": [
            "tga"
        ],
        "MimeTypes": [
            "image/x-tga"
        ]
    },
    "archreq": 0,
    "className": "QTgaPlugin",
    "debug": false,
    "version": 331520
}
Got keys from plugin meta data ("tga")
QFactoryLoader::QFactoryLoader() looking at "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qtgad.dll"
Found metadata in lib F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qtgad.dll, metadata=
{
    "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
    "MetaData": {
        "Keys": [
            "tga"
        ],
        "MimeTypes": [
            "image/x-tga"
        ]
    },
    "archreq": 1,
    "className": "QTgaPlugin",
    "debug": true,
    "version": 331520
}
"The plugin 'F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qtgad.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qtiff.dll"
Found metadata in lib F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qtiff.dll, metadata=
{
    "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
    "MetaData": {
        "Keys": [
            "tiff",
            "tif"
        ],
        "MimeTypes": [
            "image/tiff",
            "image/tiff"
        ]
    },
    "archreq": 0,
    "className": "QTiffPlugin",
    "debug": false,
    "version": 331520
}
Got keys from plugin meta data ("tiff", "tif")
QFactoryLoader::QFactoryLoader() looking at "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qtiffd.dll"
Found metadata in lib F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qtiffd.dll, metadata=
{
    "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
    "MetaData": {
        "Keys": [
            "tiff",
            "tif"
        ],
        "MimeTypes": [
            "image/tiff",
            "image/tiff"
        ]
    },
    "archreq": 1,
    "className": "QTiffPlugin",
    "debug": true,
    "version": 331520
}
"The plugin 'F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qtiffd.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qwbmp.dll"
Found metadata in lib F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qwbmp.dll, metadata=
{
    "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
    "MetaData": {
        "Keys": [
            "wbmp"
        ],
        "MimeTypes": [
            "image/vnd.wap.wbmp"
        ]
    },
    "archreq": 0,
    "className": "QWbmpPlugin",
    "debug": false,
    "version": 331520
}
Got keys from plugin meta data ("wbmp")
QFactoryLoader::QFactoryLoader() looking at "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qwbmpd.dll"
Found metadata in lib F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qwbmpd.dll, metadata=
{
    "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
    "MetaData": {
        "Keys": [
            "wbmp"
        ],
        "MimeTypes": [
            "image/vnd.wap.wbmp"
        ]
    },
    "archreq": 1,
    "className": "QWbmpPlugin",
    "debug": true,
    "version": 331520
}
"The plugin 'F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qwbmpd.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qwebp.dll"
Found metadata in lib F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qwebp.dll, metadata=
{
    "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
    "MetaData": {
        "Keys": [
            "webp"
        ],
        "MimeTypes": [
            "image/webp"
        ]
    },
    "archreq": 0,
    "className": "QWebpPlugin",
    "debug": false,
    "version": 331520
}
Got keys from plugin meta data ("webp")
QFactoryLoader::QFactoryLoader() looking at "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qwebpd.dll"
Found metadata in lib F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qwebpd.dll, metadata=
{
    "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
    "MetaData": {
        "Keys": [
            "webp"
        ],
        "MimeTypes": [
            "image/webp"
        ]
    },
    "archreq": 1,
    "className": "QWebpPlugin",
    "debug": true,
    "version": 331520
}
"The plugin 'F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qwebpd.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 
         not a plugin
loaded library "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qgif.dll"
loaded library "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qicns.dll"
loaded library "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qico.dll"
loaded library "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qjpeg.dll"
loaded library "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qsvg.dll"
loaded library "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qtga.dll"
loaded library "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qtiff.dll"
loaded library "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qwbmp.dll"
loaded library "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qwebp.dll"
QFactoryLoader::QFactoryLoader() checking directory path "F:/Qt/5.15.0/msvc2019_64/plugins/platforms" ...
QFactoryLoader::QFactoryLoader() looking at "F:/Qt/5.15.0/msvc2019_64/plugins/platforms/qdirect2d.dll"
Found metadata in lib F:/Qt/5.15.0/msvc2019_64/plugins/platforms/qdirect2d.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "direct2d"
        ]
    },
    "archreq": 0,
    "className": "QWindowsDirect2DIntegrationPlugin",
    "debug": false,
    "version": 331520
}
Got keys from plugin meta data ("direct2d")
QFactoryLoader::QFactoryLoader() looking at "F:/Qt/5.15.0/msvc2019_64/plugins/platforms/qdirect2dd.dll"
Found metadata in lib F:/Qt/5.15.0/msvc2019_64/plugins/platforms/qdirect2dd.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "direct2d"
        ]
    },
    "archreq": 1,
    "className": "QWindowsDirect2DIntegrationPlugin",
    "debug": true,
    "version": 331520
}
"The plugin 'F:/Qt/5.15.0/msvc2019_64/plugins/platforms/qdirect2dd.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "F:/Qt/5.15.0/msvc2019_64/plugins/platforms/qminimal.dll"
Found metadata in lib F:/Qt/5.15.0/msvc2019_64/plugins/platforms/qminimal.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "minimal"
        ]
    },
    "archreq": 0,
    "className": "QMinimalIntegrationPlugin",
    "debug": false,
    "version": 331520
}
Got keys from plugin meta data ("minimal")
QFactoryLoader::QFactoryLoader() looking at "F:/Qt/5.15.0/msvc2019_64/plugins/platforms/qminimald.dll"
Found metadata in lib F:/Qt/5.15.0/msvc2019_64/plugins/platforms/qminimald.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "minimal"
        ]
    },
    "archreq": 1,
    "className": "QMinimalIntegrationPlugin",
    "debug": true,
    "version": 331520
}
"The plugin 'F:/Qt/5.15.0/msvc2019_64/plugins/platforms/qminimald.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "F:/Qt/5.15.0/msvc2019_64/plugins/platforms/qoffscreen.dll"
Found metadata in lib F:/Qt/5.15.0/msvc2019_64/plugins/platforms/qoffscreen.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "offscreen"
        ]
    },
    "archreq": 0,
    "className": "QOffscreenIntegrationPlugin",
    "debug": false,
    "version": 331520
}
Got keys from plugin meta data ("offscreen")
QFactoryLoader::QFactoryLoader() looking at "F:/Qt/5.15.0/msvc2019_64/plugins/platforms/qoffscreend.dll"
Found metadata in lib F:/Qt/5.15.0/msvc2019_64/plugins/platforms/qoffscreend.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "offscreen"
        ]
    },
    "archreq": 1,
    "className": "QOffscreenIntegrationPlugin",
    "debug": true,
    "version": 331520
}
"The plugin 'F:/Qt/5.15.0/msvc2019_64/plugins/platforms/qoffscreend.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "F:/Qt/5.15.0/msvc2019_64/plugins/platforms/qwebgl.dll"
Found metadata in lib F:/Qt/5.15.0/msvc2019_64/plugins/platforms/qwebgl.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "webgl"
        ]
    },
    "archreq": 0,
    "className": "QWebGLIntegrationPlugin",
    "debug": false,
    "version": 331520
}
Got keys from plugin meta data ("webgl")
QFactoryLoader::QFactoryLoader() looking at "F:/Qt/5.15.0/msvc2019_64/plugins/platforms/qwebgld.dll"
Found metadata in lib F:/Qt/5.15.0/msvc2019_64/plugins/platforms/qwebgld.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "webgl"
        ]
    },
    "archreq": 1,
    "className": "QWebGLIntegrationPlugin",
    "debug": true,
    "version": 331520
}
"The plugin 'F:/Qt/5.15.0/msvc2019_64/plugins/platforms/qwebgld.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "F:/Qt/5.15.0/msvc2019_64/plugins/platforms/qwindows.dll"
Found metadata in lib F:/Qt/5.15.0/msvc2019_64/plugins/platforms/qwindows.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "windows"
        ]
    },
    "archreq": 0,
    "className": "QWindowsIntegrationPlugin",
    "debug": false,
    "version": 331520
}
Got keys from plugin meta data ("windows")
QFactoryLoader::QFactoryLoader() looking at "F:/Qt/5.15.0/msvc2019_64/plugins/platforms/qwindowsd.dll"
Found metadata in lib F:/Qt/5.15.0/msvc2019_64/plugins/platforms/qwindowsd.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "windows"
        ]
    },
    "archreq": 1,
    "className": "QWindowsIntegrationPlugin",
    "debug": true,
    "version": 331520
}
"The plugin 'F:/Qt/5.15.0/msvc2019_64/plugins/platforms/qwindowsd.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 
         not a plugin
QFactoryLoader::QFactoryLoader() checking directory path "F:/QtProjects/build-QXGMusic-Desktop_Qt_5_15_0_MSVC2019_64bit-Release/release/platforms" ...
loaded library "F:/Qt/5.15.0/msvc2019_64/plugins/platforms/qwindows.dll"
QFactoryLoader::QFactoryLoader() checking directory path "F:/Qt/5.15.0/msvc2019_64/plugins/platformthemes" ...
QFactoryLoader::QFactoryLoader() looking at "F:/Qt/5.15.0/msvc2019_64/plugins/platformthemes/qxdgdesktopportal.dll"
Found metadata in lib F:/Qt/5.15.0/msvc2019_64/plugins/platformthemes/qxdgdesktopportal.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformThemeFactoryInterface.5.1",
    "MetaData": {
        "Keys": [
            "xdgdesktopportal",
            "flatpak",
            "snap"
        ]
    },
    "archreq": 0,
    "className": "QXdgDesktopPortalThemePlugin",
    "debug": false,
    "version": 331520
}
Got keys from plugin meta data ("xdgdesktopportal", "flatpak", "snap")
QFactoryLoader::QFactoryLoader() looking at "F:/Qt/5.15.0/msvc2019_64/plugins/platformthemes/qxdgdesktopportald.dll"
Found metadata in lib F:/Qt/5.15.0/msvc2019_64/plugins/platformthemes/qxdgdesktopportald.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformThemeFactoryInterface.5.1",
    "MetaData": {
        "Keys": [
            "xdgdesktopportal",
            "flatpak",
            "snap"
        ]
    },
    "archreq": 1,
    "className": "QXdgDesktopPortalThemePlugin",
    "debug": true,
    "version": 331520
}
"The plugin 'F:/Qt/5.15.0/msvc2019_64/plugins/platformthemes/qxdgdesktopportald.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 
         not a plugin
QFactoryLoader::QFactoryLoader() checking directory path "F:/QtProjects/build-QXGMusic-Desktop_Qt_5_15_0_MSVC2019_64bit-Release/release/platformthemes" ...
QFactoryLoader::QFactoryLoader() checking directory path "F:/Qt/5.15.0/msvc2019_64/plugins/styles" ...
QFactoryLoader::QFactoryLoader() looking at "F:/Qt/5.15.0/msvc2019_64/plugins/styles/qwindowsvistastyle.dll"
Found metadata in lib F:/Qt/5.15.0/msvc2019_64/plugins/styles/qwindowsvistastyle.dll, metadata=
{
    "IID": "org.qt-project.Qt.QStyleFactoryInterface",
    "MetaData": {
        "Keys": [
            "windowsvista"
        ]
    },
    "archreq": 0,
    "className": "QWindowsVistaStylePlugin",
    "debug": false,
    "version": 331520
}
Got keys from plugin meta data ("windowsvista")
QFactoryLoader::QFactoryLoader() looking at "F:/Qt/5.15.0/msvc2019_64/plugins/styles/qwindowsvistastyled.dll"
Found metadata in lib F:/Qt/5.15.0/msvc2019_64/plugins/styles/qwindowsvistastyled.dll, metadata=
{
    "IID": "org.qt-project.Qt.QStyleFactoryInterface",
    "MetaData": {
        "Keys": [
            "windowsvista"
        ]
    },
    "archreq": 1,
    "className": "QWindowsVistaStylePlugin",
    "debug": true,
    "version": 331520
}
"The plugin 'F:/Qt/5.15.0/msvc2019_64/plugins/styles/qwindowsvistastyled.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 
         not a plugin
QFactoryLoader::QFactoryLoader() checking directory path "F:/QtProjects/build-QXGMusic-Desktop_Qt_5_15_0_MSVC2019_64bit-Release/release/styles" ...
loaded library "F:/Qt/5.15.0/msvc2019_64/plugins/styles/qwindowsvistastyle.dll"
QFactoryLoader::QFactoryLoader() checking directory path "F:/Qt/5.15.0/msvc2019_64/plugins/accessible" ...
QFactoryLoader::QFactoryLoader() checking directory path "F:/QtProjects/build-QXGMusic-Desktop_Qt_5_15_0_MSVC2019_64bit-Release/release/accessible" ...
QFactoryLoader::QFactoryLoader() checking directory path "F:/Qt/5.15.0/msvc2019_64/plugins/accessiblebridge" ...
QFactoryLoader::QFactoryLoader() checking directory path "F:/QtProjects/build-QXGMusic-Desktop_Qt_5_15_0_MSVC2019_64bit-Release/release/accessiblebridge" ...
libpng warning: iCCP: known incorrect sRGB profile

When finish debugging:

QLibraryPrivate::unload succeeded on "F:/Qt/5.15.0/msvc2019_64/plugins/styles/qwindowsvistastyle.dll" 
QLibraryPrivate::unload succeeded on "F:/Qt/5.15.0/msvc2019_64/plugins/platforms/qwindows.dll" 
QLibraryPrivate::unload succeeded on "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qgif.dll" 
QLibraryPrivate::unload succeeded on "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qicns.dll" 
QLibraryPrivate::unload succeeded on "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qico.dll" 
QLibraryPrivate::unload succeeded on "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qjpeg.dll" 
QLibraryPrivate::unload succeeded on "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qsvg.dll" 
QLibraryPrivate::unload succeeded on "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qtga.dll" 
QLibraryPrivate::unload succeeded on "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qtiff.dll" 
QLibraryPrivate::unload succeeded on "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qwbmp.dll" 
QLibraryPrivate::unload succeeded on "F:/Qt/5.15.0/msvc2019_64/plugins/imageformats/qwebp.dll" 
QLibraryPrivate::unload succeeded on "F:/Qt/5.15.0/msvc2019_64/plugins/./imageformats/qjpeg.dll"

Note these are Qt Creator output, I am looking for a way to get output from my deployed program

Christian Ehrlicher

@closer_ex said in Deployed program fails to load JPEG:

Note these are Qt Creator output

So this does not help as we know it works there.

/edit:

I am looking for a way to get output from my deployed program

I would take a look at windbg or similar or compile the program so it opens a command prompt (pro: CONFIG += console)

closer_ex

@Christian-Ehrlicher said in Deployed program fails to load JPEG:

@closer_ex said in Deployed program fails to load JPEG:

Note these are Qt Creator output

So this does not help as we know it works there.

/edit:

I am looking for a way to get output from my deployed program

I would take a look at windbg or similar or compile the program so it opens a command prompt (pro: CONFIG += console)

CONFIG += console does open a console window, but it only produce plugin debug output when running from Qt Creator(not after deploying, should I try deploy a debug version?)

windbg result:

CommandLine: "F:\cutexg music\QXGMusic_win10.exe"

************* Path validation summary **************
Response                         Time (ms)     Location
Deferred                                       srv*
Symbol search path is: srv*
Executable search path is: 
ModLoad: 00007ff6`7f960000 00007ff6`7f9c0000   image00007ff6`7f960000
ModLoad: 00007fff`00f10000 00007fff`01105000   ntdll.dll
ModLoad: 00007ffe`ff8c0000 00007ffe`ff97d000   C:\WINDOWS\System32\KERNEL32.DLL
ModLoad: 00007ffe`fe650000 00007ffe`fe917000   C:\WINDOWS\System32\KERNELBASE.dll
ModLoad: 00007fff`00da0000 00007fff`00ec9000   C:\WINDOWS\System32\ole32.dll
ModLoad: 00007ffe`fea90000 00007ffe`feb90000   C:\WINDOWS\System32\ucrtbase.dll
ModLoad: 00007fff`00c10000 00007fff`00d34000   C:\WINDOWS\System32\RPCRT4.dll
ModLoad: 00007ffe`ffb30000 00007ffe`ffe85000   C:\WINDOWS\System32\combase.dll
ModLoad: 00007fff`00a70000 00007fff`00a9a000   C:\WINDOWS\System32\GDI32.dll
ModLoad: 00007ffe`fef40000 00007ffe`fef62000   C:\WINDOWS\System32\win32u.dll
ModLoad: 00007ffe`fe980000 00007ffe`fea89000   C:\WINDOWS\System32\gdi32full.dll
ModLoad: 00007ffe`febe0000 00007ffe`fec7d000   C:\WINDOWS\System32\msvcp_win.dll
ModLoad: 00007ffe`ff980000 00007ffe`ffb20000   C:\WINDOWS\System32\USER32.dll
ModLoad: 00007ffe`8f260000 00007ffe`8f7a7000   F:\cutexg music\Qt5Widgets.dll
ModLoad: 00007ffe`830d0000 00007ffe`83693000   F:\cutexg music\Qt5Core.dll
ModLoad: 00007ffe`95130000 00007ffe`9527f000   F:\cutexg music\Qt5Network.dll
ModLoad: 00007ffe`8d8e0000 00007ffe`8dfb6000   F:\cutexg music\Qt5Gui.dll
ModLoad: 00007ffe`fed60000 00007ffe`feebd000   C:\WINDOWS\System32\CRYPT32.dll
ModLoad: 00007ffe`fffc0000 00007fff`00701000   C:\WINDOWS\System32\SHELL32.dll
ModLoad: 00007ffe`ff6f0000 00007ffe`ff79a000   C:\WINDOWS\System32\ADVAPI32.dll
ModLoad: 00007fff`00710000 00007fff`007ae000   C:\WINDOWS\System32\msvcrt.dll
ModLoad: 00007ffe`fef70000 00007ffe`ff00b000   C:\WINDOWS\System32\sechost.dll
ModLoad: 00007ffe`ef2a0000 00007ffe`ef331000   C:\WINDOWS\SYSTEM32\MSVCP140.dll
ModLoad: 00007ffe`fff50000 00007ffe`fffbb000   C:\WINDOWS\System32\WS2_32.dll
ModLoad: 00007ffe`c9750000 00007ffe`c985a000   C:\WINDOWS\SYSTEM32\MFReadWrite.dll
ModLoad: 00007ffe`d1a10000 00007ffe`d1bcb000   C:\WINDOWS\SYSTEM32\MFPlat.DLL
ModLoad: 00007ffe`efb40000 00007ffe`efb59000   C:\WINDOWS\SYSTEM32\VCRUNTIME140.dll
ModLoad: 00007ffe`feb90000 00007ffe`febdd000   C:\WINDOWS\System32\cfgmgr32.dll
ModLoad: 00007ffe`efb30000 00007ffe`efb3c000   C:\WINDOWS\SYSTEM32\VCRUNTIME140_1.dll
ModLoad: 00007ffe`ffea0000 00007ffe`fff4e000   C:\WINDOWS\System32\shcore.dll
ModLoad: 00007ffe`fdb20000 00007ffe`fdbeb000   C:\WINDOWS\SYSTEM32\DNSAPI.dll
ModLoad: 00007ffe`fdae0000 00007ffe`fdb1b000   C:\WINDOWS\SYSTEM32\IPHLPAPI.DLL
ModLoad: 00007ffe`fc2c0000 00007ffe`fc2ef000   C:\WINDOWS\SYSTEM32\dwmapi.dll
ModLoad: 00007ffe`fc0d0000 00007ffe`fc16f000   C:\WINDOWS\SYSTEM32\UxTheme.dll
ModLoad: 00007ffe`faae0000 00007ffe`faae9000   C:\WINDOWS\SYSTEM32\MSVCP140_1.dll
ModLoad: 00007ffe`fa730000 00007ffe`fa993000   C:\WINDOWS\SYSTEM32\d3d11.dll
ModLoad: 00007ffe`fcf90000 00007ffe`fd083000   C:\WINDOWS\SYSTEM32\dxgi.dll
ModLoad: 00007ffe`fe540000 00007ffe`fe56e000   C:\WINDOWS\SYSTEM32\USERENV.dll
ModLoad: 00007ffe`f90e0000 00007ffe`f90ea000   C:\WINDOWS\SYSTEM32\VERSION.dll
ModLoad: 00007ffe`e4040000 00007ffe`e405d000   C:\WINDOWS\SYSTEM32\MPR.dll
ModLoad: 00007ffe`f02e0000 00007ffe`f02f8000   C:\WINDOWS\SYSTEM32\NETAPI32.dll
ModLoad: 00007ffe`f2c10000 00007ffe`f2c37000   C:\WINDOWS\SYSTEM32\WINMM.dll
ModLoad: 00007ffe`fdbf0000 00007ffe`fdbfc000   C:\WINDOWS\SYSTEM32\NETUTILS.DLL
ModLoad: 00007ffe`eae10000 00007ffe`eae38000   C:\WINDOWS\SYSTEM32\SRVCLI.DLL
ModLoad: 00007ffe`fe030000 00007ffe`fe03c000   C:\WINDOWS\SYSTEM32\CRYPTBASE.DLL
(1b9c.c8c): Break instruction exception - code 80000003 (first chance)
ntdll!LdrInitShimEngineDynamic+0x360:
00007fff`00fe0630 cc              int     3

Does this mean only the basic Qt modules are loaded?
I used Dependencies before and it showed the same structure.

Christian Ehrlicher

WinDbg has also a mode to catch the debug output afaik.

As you see there are no plugins loaded. Is you jpeg plugin really in F:\cutexg music\imageformats ?

Bonnie

@closer_ex
I'm not a WinDbg expert, but with only these output, your UI probably haven't shown yet, right?
You need to give it a "Go" from the "Debug" menu because it will auto break at the start.

closer_ex

@Christian-Ehrlicher
Yes they are, that's why I'm so confused. More output listed below, but still no image plugins loaded.

I've also added config += release to make sure it uses release version plugins.

Here is my deploy folder structure:( sorry images are uploaded to imgur, please click link to see)
root

Inside /imageformats are plugins copied by windeployqt and are release version:

And by "doesn't load" I mean something like this:
jpeg not loaded

Running from Qt Creator:
jpeg loaded

There is another phenomenon that might help, as is mentioned in the main post:

I kept a former version exe under the same deploy folder, which had no problem loading jpeg. I moved the qjpeg.dll out of the /imageformats folder, run it and saw the same null pixmap. Then I move the dll back, but this former one still can't load jpeg.

@Bonnie
Thanks for the hint, now it's creating more output:

************* Path validation summary **************
Response                         Time (ms)     Location
Deferred                                       srv*
Symbol search path is: srv*
Executable search path is: 
ModLoad: 00007ff6`90ba0000 00007ff6`90c00000   F:\cutexg music\QXGMusic_win10.exe
ModLoad: 00007fff`00f10000 00007fff`01105000   C:\WINDOWS\SYSTEM32\ntdll.dll
ModLoad: 00007ffe`ff8c0000 00007ffe`ff97d000   C:\WINDOWS\System32\KERNEL32.DLL
ModLoad: 00007ffe`fe650000 00007ffe`fe917000   C:\WINDOWS\System32\KERNELBASE.dll
ModLoad: 00007fff`00da0000 00007fff`00ec9000   C:\WINDOWS\System32\ole32.dll
ModLoad: 00007ffe`fea90000 00007ffe`feb90000   C:\WINDOWS\System32\ucrtbase.dll
ModLoad: 00007fff`00c10000 00007fff`00d34000   C:\WINDOWS\System32\RPCRT4.dll
ModLoad: 00007ffe`ffb30000 00007ffe`ffe85000   C:\WINDOWS\System32\combase.dll
ModLoad: 00007fff`00a70000 00007fff`00a9a000   C:\WINDOWS\System32\GDI32.dll
ModLoad: 00007ffe`fef40000 00007ffe`fef62000   C:\WINDOWS\System32\win32u.dll
ModLoad: 00007ffe`fe980000 00007ffe`fea89000   C:\WINDOWS\System32\gdi32full.dll
ModLoad: 00007ffe`febe0000 00007ffe`fec7d000   C:\WINDOWS\System32\msvcp_win.dll
ModLoad: 00007ffe`ff980000 00007ffe`ffb20000   C:\WINDOWS\System32\USER32.dll
ModLoad: 00007ffe`c84a0000 00007ffe`c8b76000   F:\cutexg music\Qt5Gui.dll
ModLoad: 00007ffe`ce4d0000 00007ffe`cea17000   F:\cutexg music\Qt5Widgets.dll
ModLoad: 00007ffe`ef2a0000 00007ffe`ef331000   C:\WINDOWS\SYSTEM32\MSVCP140.dll
ModLoad: 00007ffe`c7ed0000 00007ffe`c8493000   F:\cutexg music\Qt5Core.dll
ModLoad: 00007ffe`c9750000 00007ffe`c985a000   C:\WINDOWS\SYSTEM32\MFReadWrite.dll
ModLoad: 00007fff`00710000 00007fff`007ae000   C:\WINDOWS\System32\msvcrt.dll
ModLoad: 00007ffe`fffc0000 00007fff`00701000   C:\WINDOWS\System32\SHELL32.dll
ModLoad: 00007ffe`d1a10000 00007ffe`d1bcb000   C:\WINDOWS\SYSTEM32\MFPlat.DLL
ModLoad: 00007ffe`efb40000 00007ffe`efb59000   C:\WINDOWS\SYSTEM32\VCRUNTIME140.dll
ModLoad: 00007ffe`fef70000 00007ffe`ff00b000   C:\WINDOWS\System32\sechost.dll
ModLoad: 00007ffe`ce380000 00007ffe`ce4cf000   F:\cutexg music\Qt5Network.dll
ModLoad: 00007ffe`fff50000 00007ffe`fffbb000   C:\WINDOWS\System32\WS2_32.dll
ModLoad: 00007ffe`efb30000 00007ffe`efb3c000   C:\WINDOWS\SYSTEM32\VCRUNTIME140_1.dll
ModLoad: 00007ffe`ff6f0000 00007ffe`ff79a000   C:\WINDOWS\System32\ADVAPI32.dll
ModLoad: 00007ffe`fa730000 00007ffe`fa993000   C:\WINDOWS\SYSTEM32\d3d11.dll
ModLoad: 00007ffe`fed60000 00007ffe`feebd000   C:\WINDOWS\System32\CRYPT32.dll
ModLoad: 00007ffe`fcf90000 00007ffe`fd083000   C:\WINDOWS\SYSTEM32\dxgi.dll
ModLoad: 00007ffe`fc0d0000 00007ffe`fc16f000   C:\WINDOWS\SYSTEM32\UxTheme.dll
ModLoad: 00007ffe`feb90000 00007ffe`febdd000   C:\WINDOWS\System32\cfgmgr32.dll
ModLoad: 00007ffe`faae0000 00007ffe`faae9000   C:\WINDOWS\SYSTEM32\MSVCP140_1.dll
ModLoad: 00007ffe`fc2c0000 00007ffe`fc2ef000   C:\WINDOWS\SYSTEM32\dwmapi.dll
ModLoad: 00007ffe`e4040000 00007ffe`e405d000   C:\WINDOWS\SYSTEM32\MPR.dll
ModLoad: 00007ffe`fe540000 00007ffe`fe56e000   C:\WINDOWS\SYSTEM32\USERENV.dll
ModLoad: 00007ffe`f90e0000 00007ffe`f90ea000   C:\WINDOWS\SYSTEM32\VERSION.dll
ModLoad: 00007ffe`f02e0000 00007ffe`f02f8000   C:\WINDOWS\SYSTEM32\NETAPI32.dll
ModLoad: 00007ffe`ffea0000 00007ffe`fff4e000   C:\WINDOWS\System32\shcore.dll
ModLoad: 00007ffe`fdae0000 00007ffe`fdb1b000   C:\WINDOWS\SYSTEM32\IPHLPAPI.DLL
ModLoad: 00007ffe`fdb20000 00007ffe`fdbeb000   C:\WINDOWS\SYSTEM32\DNSAPI.dll
ModLoad: 00007ffe`f2c10000 00007ffe`f2c37000   C:\WINDOWS\SYSTEM32\WINMM.dll
ModLoad: 00007ffe`fdbf0000 00007ffe`fdbfc000   C:\WINDOWS\SYSTEM32\NETUTILS.DLL
ModLoad: 00007ffe`eae10000 00007ffe`eae38000   C:\WINDOWS\SYSTEM32\SRVCLI.DLL
ModLoad: 00007ffe`fe030000 00007ffe`fe03c000   C:\WINDOWS\SYSTEM32\CRYPTBASE.DLL
ModLoad: 00007fff`00b00000 00007fff`00b30000   C:\WINDOWS\System32\IMM32.DLL
ModLoad: 00007ffe`ffe90000 00007ffe`ffe99000   C:\WINDOWS\System32\NSI.dll
ModLoad: 00007ffe`fc5b0000 00007ffe`fc5c3000   C:\WINDOWS\SYSTEM32\kernel.appcore.dll
ModLoad: 00007ffe`feec0000 00007ffe`fef3f000   C:\WINDOWS\System32\bcryptPrimitives.dll
ModLoad: 00007ffe`d19a0000 00007ffe`d19d0000   C:\WINDOWS\SYSTEM32\RTWorkQ.DLL
ModLoad: 00007ffe`fc7b0000 00007ffe`fcf43000   C:\WINDOWS\SYSTEM32\windows.storage.dll
ModLoad: 00007ffe`fe0c0000 00007ffe`fe0ec000   C:\WINDOWS\SYSTEM32\Wldp.dll
ModLoad: 00007fff`00aa0000 00007fff`00af5000   C:\WINDOWS\System32\shlwapi.dll
ModLoad: 00007ffe`fe580000 00007ffe`fe5a6000   C:\WINDOWS\SYSTEM32\profapi.dll
ModLoad: 00007ffe`c7d50000 00007ffe`c7ec5000   F:\cutexg music\platforms\qwindows.dll
ModLoad: 00007fff`00b40000 00007fff`00c0d000   C:\WINDOWS\System32\OLEAUT32.dll
ModLoad: 00007ffe`fa280000 00007ffe`fa294000   C:\WINDOWS\SYSTEM32\WTSAPI32.dll
ModLoad: 00007ffe`fdc50000 00007ffe`fdc9b000   C:\WINDOWS\SYSTEM32\powrprof.dll
ModLoad: 00007ffe`fdac0000 00007ffe`fdad2000   C:\WINDOWS\SYSTEM32\UMPDC.dll
ModLoad: 00007ffe`de3e0000 00007ffe`de406000   F:\cutexg music\styles\qwindowsvistastyle.dll
ModLoad: 00007ffe`dbe50000 00007ffe`dc0ce000   C:\WINDOWS\system32\dwrite.dll
ModLoad: 00007ffe`f8930000 00007ffe`f8947000   C:\WINDOWS\SYSTEM32\dhcpcsvc6.DLL
ModLoad: 00007ffe`f8910000 00007ffe`f892d000   C:\WINDOWS\SYSTEM32\dhcpcsvc.DLL
ModLoad: 00007ffe`f61f0000 00007ffe`f63bd000   C:\WINDOWS\system32\d3d9.dll
ModLoad: 00007ffe`d8ba0000 00007ffe`d8c3e000   C:\WINDOWS\SYSTEM32\xaudio2_9.dll
ModLoad: 00007ffe`f90f0000 00007ffe`f9175000   C:\WINDOWS\SYSTEM32\MMDevAPI.DLL
ModLoad: 00007ffe`f8ea0000 00007ffe`f8eaa000   C:\WINDOWS\SYSTEM32\AVRT.dll
ModLoad: 00007ffe`fe400000 00007ffe`fe42c000   C:\WINDOWS\SYSTEM32\DEVOBJ.dll
ModLoad: 00007fff`007b0000 00007fff`00858000   C:\WINDOWS\System32\clbcatq.dll
ModLoad: 00007ffe`f8eb0000 00007ffe`f8ee1000   C:\WINDOWS\SYSTEM32\cryptnet.dll
ModLoad: 00007ffe`fe920000 00007ffe`fe980000   C:\WINDOWS\System32\WINTRUST.DLL
ModLoad: 00007ffe`fe240000 00007ffe`fe252000   C:\WINDOWS\SYSTEM32\MSASN1.dll
ModLoad: 00007ffe`ff510000 00007ffe`ff52d000   C:\WINDOWS\System32\imagehlp.dll
ModLoad: 00007ffe`f9280000 00007ffe`f9400000   C:\WINDOWS\SYSTEM32\AUDIOSES.DLL
ModLoad: 00007ffe`fc1d0000 00007ffe`fc1e4000   C:\WINDOWS\SYSTEM32\resourcepolicyclient.dll
ModLoad: 00007ffe`fe010000 00007ffe`fe028000   C:\WINDOWS\SYSTEM32\CRYPTSP.dll
ModLoad: 00007ffe`fd760000 00007ffe`fd794000   C:\WINDOWS\system32\rsaenh.dll
ModLoad: 00007ffe`fed30000 00007ffe`fed57000   C:\WINDOWS\System32\bcrypt.dll
ModLoad: 00007ffe`ff7a0000 00007ffe`ff8b5000   C:\WINDOWS\System32\MSCTF.dll
ModLoad: 00007ffe`dcae0000 00007ffe`dcb1e000   C:\WINDOWS\system32\dataexchange.dll
ModLoad: 00007ffe`fb340000 00007ffe`fb525000   C:\WINDOWS\system32\dcomp.dll
ModLoad: 00007ffe`f8050000 00007ffe`f8257000   C:\WINDOWS\system32\twinapi.appcore.dll
ModLoad: 00007ffe`edc10000 00007ffe`edd0d000   C:\WINDOWS\SYSTEM32\textinputframework.dll
ModLoad: 00007ffe`fb8b0000 00007ffe`fbc0a000   C:\WINDOWS\System32\CoreUIComponents.dll
ModLoad: 00007ffe`fbc10000 00007ffe`fbd02000   C:\WINDOWS\System32\CoreMessaging.dll
ModLoad: 00007ffe`fd380000 00007ffe`fd3b3000   C:\WINDOWS\SYSTEM32\ntmarta.dll
ModLoad: 00007ffe`fb1e0000 00007ffe`fb336000   C:\WINDOWS\SYSTEM32\wintypes.dll
ModLoad: 00007ffe`e7ab0000 00007ffe`e7b16000   C:\WINDOWS\system32\Oleacc.dll
ModLoad: 00007ffe`d5840000 00007ffe`d5b34000   C:\WINDOWS\system32\UIAutomationCore.dll
ModLoad: 00007ffe`f9fd0000 00007ffe`fa0c7000   C:\WINDOWS\SYSTEM32\PROPSYS.dll
ModLoad: 00007ffe`fe450000 00007ffe`fe4f2000   C:\WINDOWS\SYSTEM32\sxs.dll
(3558.275c): Break instruction exception - code 80000003 (first chance)
ntdll!DbgBreakPoint:
00007fff`00faf8b0 cc              int     3

Seems the platforms and styles plugins are loaded, but still no imageformats.

Christian Ehrlicher

We need the debug output from the system where the plugins are not loaded.

closer_ex

@Christian-Ehrlicher

The following lines are missing:

ModLoad: 00007ffe`eef80000 00007ffe`eef8d000   F:\Qt\5.15.0\msvc2019_64\plugins\imageformats\qgif.dll
ModLoad: 00007ffe`e3130000 00007ffe`e313f000   F:\Qt\5.15.0\msvc2019_64\plugins\imageformats\qicns.dll
ModLoad: 00007ffe`de440000 00007ffe`de44d000   F:\Qt\5.15.0\msvc2019_64\plugins\imageformats\qico.dll
ModLoad: 00007ffe`d8bd0000 00007ffe`d8c3a000   F:\Qt\5.15.0\msvc2019_64\plugins\imageformats\qjpeg.dll
ModLoad: 00007ffe`de430000 00007ffe`de43c000   F:\Qt\5.15.0\msvc2019_64\plugins\imageformats\qsvg.dll
ModLoad: 00007ffe`de3b0000 00007ffe`de404000   F:\Qt\5.15.0\msvc2019_64\bin\Qt5Svg.dll
ModLoad: 00007ffe`de370000 00007ffe`de37c000   F:\Qt\5.15.0\msvc2019_64\plugins\imageformats\qtga.dll
ModLoad: 00007ffe`cf660000 00007ffe`cf6c3000   F:\Qt\5.15.0\msvc2019_64\plugins\imageformats\qtiff.dll
ModLoad: 00007ffe`d8bc0000 00007ffe`d8bcb000   F:\Qt\5.15.0\msvc2019_64\plugins\imageformats\qwbmp.dll
ModLoad: 00007ffe`cf5d0000 00007ffe`cf653000   F:\Qt\5.15.0\msvc2019_64\plugins\imageformats\qwebp.dll

Right before qwindows.dll.
I compared 2 outputs, other lines are the same except some loading sequence. No clue why Qt5Svg is not loaded though...

Christian Ehrlicher

Again: please find a way to catch the debug outputs (e.g. with qInstallMessageHandler) so we can see what QT_DEBUG_PLUGINS prints out!

closer_ex

@Christian-Ehrlicher
The message handler somehow started to log plugins debug info.

Debug: QFactoryLoader::QFactoryLoader() checking directory path "F:/cutexg music/platforms" ...
Debug: QFactoryLoader::QFactoryLoader() looking at "F:/cutexg music/platforms/qminimal.dll"
Warning: Found metadata in lib F:/cutexg music/platforms/qminimal.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "minimal"
        ]
    },
    "archreq": 0,
    "className": "QMinimalIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Debug: Got keys from plugin meta data ("minimal")
Debug: QFactoryLoader::QFactoryLoader() looking at "F:/cutexg music/platforms/qwindows.dll"
Warning: Found metadata in lib F:/cutexg music/platforms/qwindows.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "windows"
        ]
    },
    "archreq": 0,
    "className": "QWindowsIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Debug: Got keys from plugin meta data ("windows")
Debug: loaded library "F:/cutexg music/platforms/qwindows.dll"
Debug: QFactoryLoader::QFactoryLoader() checking directory path "F:/cutexg music/platformthemes" ...
Debug: QFactoryLoader::QFactoryLoader() checking directory path "F:/cutexg music/styles" ...
Debug: QFactoryLoader::QFactoryLoader() looking at "F:/cutexg music/styles/qwindowsvistastyle.dll"
Warning: Found metadata in lib F:/cutexg music/styles/qwindowsvistastyle.dll, metadata=
{
    "IID": "org.qt-project.Qt.QStyleFactoryInterface",
    "MetaData": {
        "Keys": [
            "windowsvista"
        ]
    },
    "archreq": 0,
    "className": "QWindowsVistaStylePlugin",
    "debug": false,
    "version": 331520
}


Debug: Got keys from plugin meta data ("windowsvista")
Debug: loaded library "F:/cutexg music/styles/qwindowsvistastyle.dll"
Debug: QFactoryLoader::QFactoryLoader() checking directory path "F:/cutexg music/accessible" ...
Debug: QFactoryLoader::QFactoryLoader() checking directory path "F:/cutexg music/accessiblebridge" ...

Indicating it's not even looking for the imageformats.

Christian Ehrlicher

Please take a look at QCoreApplication::libraryPaths(), it's the source where Qt iterates over: QFactoryLoader::update()

closer_ex

@Christian-Ehrlicher

...
QApplication a(argc, argv);
qDebug() << QCoreApplication::libraryPaths() << Qt::endl;
...

Lists only the root folder, "F:/cutexg music".

Then I tried to add an absolute path directing to MSVC plugins folder by QApplication::addLibraryPath("F:\\Qt\\5.15.0\\msvc2019_64\\plugins");

It lists both paths and pictures are shown. Plugins debug info also indicates the plugins from MSVC folder are loaded.

Christian Ehrlicher

Ok, this does not help, did not read carefully enough.
Please check the output of QImageReader::supportedImageFormats(). Did you maybe compile Qt by your own and disabled the image format plugins (QT_NO_IMAGEFORMATPLUGIN)?

/edit: im referring to https://code.woboq.org/qt5/qtbase/src/gui/image/qimagereaderwriterhelpers.cpp.html#_ZN25QImageReaderWriterHelpers21supportedImageFormatsENS_10CapabilityE - as you can see calling supportedImageFormats() should trigger the QFactoryLoader for imageformats should be called.