Qt 6.8.2 Application does not show SVGs when deployed

Ja_n

Hi,

i am developing an application using C++ and Qt 6.8.2 in Visual Studio 2022. I am using the SVG module, and all my icons are displayed in debug and release modes. As soon as windeployqt adds all necessary DLLs, my app does not display SVGs anymore.
I noticed that I can delete Qt6Core.dll and start the app from within Visual Studio (release build, without debugging) and my icons are visible.
But as soon as Qt6Core.dll is present in my release folder, my app only loads the Qt6Core, Qt6Widgets, Qt6Gui, qwindows, and qmodernwindowsstyle DLLs.
Without Qt6Core.dll, it loads all the imageformats/*.dll files and Qt6Core from my Qt installation, and Qt6Widgets, Qt6Gui, and Qt6Svg from my release folder.

Can anyone explain this to me?

Thanks!
Jan

SGaist

Hi and welcome to devnet,

From where are you trying to start your application exactly ?
Can you start it with the QT_DEBUG_PLUGINS environment variable set to 1 ? You'll have a dump on the console about what is getting loaded.

Ja_n

I don't get any info when setting QT_DEBUG_PLUGINS. I have tried
qputenv("QT_DEBUG_PLUGINS", QByteArray("1"));
as the first line in my main()
as well as using CMD or PowerShell or Visual Studio or Windows environment (reboot inclusive).

I start the app either by "Start Without Debugging" in VS or by clicking it in Windows Explorer (only when all DLLs are present, obviously).

Ja_n

i've got this by just starting the app after windeployqt via explorer:

00000001 0.00000000 [2020] qt.core.plugin.factoryloader: checking directory path "C:/MyApp/Release/platforms" ...
00000002 0.00035220 [2020] qt.core.plugin.factoryloader: looking at "qwindows.dll"
00000003 0.00076190 [2020] qt.core.plugin.loader: Found metadata in lib C:/MyApp/Release/platforms/qwindows.dll, metadata=
00000004 0.00076190 [2020] {
00000005 0.00076190 [2020] "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
00000006 0.00076190 [2020] "MetaData": {
00000007 0.00076190 [2020] "Keys": [
00000008 0.00076190 [2020] "windows"
00000009 0.00076190 [2020] ]
00000010 0.00076190 [2020] },
00000011 0.00076190 [2020] "archlevel": 0,
00000012 0.00076190 [2020] "className": "QWindowsIntegrationPlugin",
00000013 0.00076190 [2020] "debug": false,
00000014 0.00076190 [2020] "version": 395264
00000015 0.00076190 [2020] }
00000016 0.00076190 [2020]
00000017 0.00076190 [2020]
00000018 0.00082810 [2020] qt.core.plugin.factoryloader: Got keys from plugin meta data QList("windows")
00000019 0.00437390 [2020] qt.core.library: "C:/MyApp/Release/platforms/qwindows.dll" loaded library
00000020 0.01337240 [2020] qt.core.plugin.factoryloader: checking directory path "C:/MyApp/Release/platformthemes" ...
00000021 0.01875510 [2020] qt.core.plugin.factoryloader: checking directory path "C:/MyApp/Release/styles" ...
00000022 0.01899090 [2020] qt.core.plugin.factoryloader: looking at "qmodernwindowsstyle.dll"
00000023 0.01940210 [2020] qt.core.plugin.loader: Found metadata in lib C:/MyApp/Release/styles/qmodernwindowsstyle.dll, metadata=
00000024 0.01940210 [2020] {
00000025 0.01940210 [2020] "IID": "org.qt-project.Qt.QStyleFactoryInterface",
00000026 0.01940210 [2020] "MetaData": {
00000027 0.01940210 [2020] "Keys": [
00000028 0.01940210 [2020] "windowsvista",
00000029 0.01940210 [2020] "windows11"
00000030 0.01940210 [2020] ]
00000031 0.01940210 [2020] },
00000032 0.01940210 [2020] "archlevel": 0,
00000033 0.01940210 [2020] "className": "QModernWindowsStylePlugin",
00000034 0.01940210 [2020] "debug": false,
00000035 0.01940210 [2020] "version": 395264
00000036 0.01940210 [2020] }
00000037 0.01940210 [2020]
00000038 0.01940210 [2020]
00000039 0.01943430 [2020] qt.core.plugin.factoryloader: Got keys from plugin meta data QList("windowsvista", "windows11")
00000040 0.02004350 [2020] qt.core.library: "C:/MyApp/Release/styles/qmodernwindowsstyle.dll" loaded library
00000041 0.14592290 [2020] qt.core.plugin.factoryloader: checking directory path "C:/MyApp/Release/accessible" ...
00000042 0.60144359 [2020] qt.qpa.fonts: DirectWrite: CreateFontFaceFromHDC() failed for QFontDef(Family="8514oem", stylename=Regular, pointsize=6, pixelsize=20, styleHint=5, weight=400, stretch=100, hintingPreference=0) LOGFONT("8514oem", lfWidth=0, lfHeight=-20) dpi=96
00000043 0.61512852 [2020] qt.qpa.fonts: DirectWrite: CreateFontFaceFromHDC() failed for QFontDef(Family="Fixedsys", stylename=Regular, pointsize=6, pixelsize=15, styleHint=5, weight=400, stretch=100, hintingPreference=0) LOGFONT("Fixedsys", lfWidth=0, lfHeight=-15) dpi=96

Christian Ehrlicher

When you deployed your app use windeployqt and don't copy something around by yourself. Also make sure no other Qt installation is in your PATH env later on.
Is in C:/MyApp/Release/ an 'imageformats' folder with the svg plugin?

Ja_n

There is not a single reference to anything Qt in my PATH. In Visual Studio there is just the one i am using. I am using windeployqt using the absolute file path inside the Release folder or directly using the MSVC-Qt-Plugin.
This is my Release-Folder after running windeployqt on MyApp.exe:

C:\MyApp\Release>dir /s /b
C:\MyApp\Release\D3Dcompiler_47.dll
C:\MyApp\Release\generic
C:\MyApp\Release\iconengines
C:\MyApp\Release\imageformats
C:\MyApp\Release\MyApp.exe
C:\MyApp\Release\networkinformation
C:\MyApp\Release\opengl32sw.dll
C:\MyApp\Release\platforms
C:\MyApp\Release\Qt6Core.dll
C:\MyApp\Release\Qt6Gui.dll
C:\MyApp\Release\Qt6Network.dll
C:\MyApp\Release\Qt6Svg.dll
C:\MyApp\Release\Qt6Widgets.dll
C:\MyApp\Release\styles
C:\MyApp\Release\tls
C:\MyApp\Release\translations
C:\MyApp\Release\vc_redist.x64.exe
C:\MyApp\Release\generic\qtuiotouchplugin.dll
C:\MyApp\Release\iconengines\qsvgicon.dll
C:\MyApp\Release\imageformats\qgif.dll
C:\MyApp\Release\imageformats\qicns.dll
C:\MyApp\Release\imageformats\qico.dll
C:\MyApp\Release\imageformats\qjpeg.dll
C:\MyApp\Release\imageformats\qsvg.dll
C:\MyApp\Release\imageformats\qtga.dll
C:\MyApp\Release\imageformats\qtiff.dll
C:\MyApp\Release\imageformats\qwbmp.dll
C:\MyApp\Release\imageformats\qwebp.dll
C:\MyApp\Release\networkinformation\qnetworklistmanager.dll
C:\MyApp\Release\platforms\qwindows.dll
C:\MyApp\Release\styles\qmodernwindowsstyle.dll
C:\MyApp\Release\tls\qcertonlybackend.dll
C:\MyApp\Release\tls\qopensslbackend.dll
C:\MyApp\Release\tls\qschannelbackend.dll
C:\MyApp\Release\translations\qt_ar.qm
C:\MyApp\Release\translations\qt_bg.qm
C:\MyApp\Release\translations\qt_ca.qm
C:\MyApp\Release\translations\qt_cs.qm
C:\MyApp\Release\translations\qt_da.qm
C:\MyApp\Release\translations\qt_de.qm
C:\MyApp\Release\translations\qt_en.qm
C:\MyApp\Release\translations\qt_es.qm
C:\MyApp\Release\translations\qt_fa.qm
C:\MyApp\Release\translations\qt_fi.qm
C:\MyApp\Release\translations\qt_fr.qm
C:\MyApp\Release\translations\qt_gd.qm
C:\MyApp\Release\translations\qt_he.qm
C:\MyApp\Release\translations\qt_hr.qm
C:\MyApp\Release\translations\qt_hu.qm
C:\MyApp\Release\translations\qt_it.qm
C:\MyApp\Release\translations\qt_ja.qm
C:\MyApp\Release\translations\qt_ka.qm
C:\MyApp\Release\translations\qt_ko.qm
C:\MyApp\Release\translations\qt_lg.qm
C:\MyApp\Release\translations\qt_lv.qm
C:\MyApp\Release\translations\qt_nl.qm
C:\MyApp\Release\translations\qt_nn.qm
C:\MyApp\Release\translations\qt_pl.qm
C:\MyApp\Release\translations\qt_pt_BR.qm
C:\MyApp\Release\translations\qt_ru.qm
C:\MyApp\Release\translations\qt_sk.qm
C:\MyApp\Release\translations\qt_tr.qm
C:\MyApp\Release\translations\qt_uk.qm
C:\MyApp\Release\translations\qt_zh_CN.qm
C:\MyApp\Release\translations\qt_zh_TW.qm

I added my Qt installation to PATH and when i click my Application i get (no SVGs visible):

00000001	0.00000000	[12596] qt.core.plugin.factoryloader: checking directory path "C:MyApp/Release/platforms" ...	
00000002	0.00038480	[12596] qt.core.plugin.factoryloader: looking at "qwindows.dll"	
00000003	0.00130110	[12596] qt.core.plugin.loader: Found metadata in lib C:MyApp/Release/platforms/qwindows.dll, metadata=	
00000004	0.00130110	[12596] {	
00000005	0.00130110	[12596]     "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",	
00000006	0.00130110	[12596]     "MetaData": {	
00000007	0.00130110	[12596]         "Keys": [	
00000008	0.00130110	[12596]             "windows"	
00000009	0.00130110	[12596]         ]	
00000010	0.00130110	[12596]     },	
00000011	0.00130110	[12596]     "archlevel": 0,	
00000012	0.00130110	[12596]     "className": "QWindowsIntegrationPlugin",	
00000013	0.00130110	[12596]     "debug": false,	
00000014	0.00130110	[12596]     "version": 395264	
00000015	0.00130110	[12596] }	
00000016	0.00130110	[12596] 	
00000017	0.00130110	[12596] 	
00000018	0.00145340	[12596] qt.core.plugin.factoryloader: Got keys from plugin meta data QList("windows")	
00000019	0.00478800	[12596] qt.core.library: "C:MyApp/Release/platforms/qwindows.dll" loaded library	
00000020	0.01351020	[12596] qt.core.plugin.factoryloader: checking directory path "C:MyApp/Release/platformthemes" ...	
00000021	0.01852130	[12596] qt.core.plugin.factoryloader: checking directory path "C:MyApp/Release/styles" ...	
00000022	0.01875220	[12596] qt.core.plugin.factoryloader: looking at "qmodernwindowsstyle.dll"	
00000023	0.01912490	[12596] qt.core.plugin.loader: Found metadata in lib C:MyApp/Release/styles/qmodernwindowsstyle.dll, metadata=	
00000024	0.01912490	[12596] {	
00000025	0.01912490	[12596]     "IID": "org.qt-project.Qt.QStyleFactoryInterface",	
00000026	0.01912490	[12596]     "MetaData": {	
00000027	0.01912490	[12596]         "Keys": [	
00000028	0.01912490	[12596]             "windowsvista",	
00000029	0.01912490	[12596]             "windows11"	
00000030	0.01912490	[12596]         ]	
00000031	0.01912490	[12596]     },	
00000032	0.01912490	[12596]     "archlevel": 0,	
00000033	0.01912490	[12596]     "className": "QModernWindowsStylePlugin",	
00000034	0.01912490	[12596]     "debug": false,	
00000035	0.01912490	[12596]     "version": 395264	
00000036	0.01912490	[12596] }	
00000037	0.01912490	[12596] 	
00000038	0.01912490	[12596] 	
00000039	0.01914580	[12596] qt.core.plugin.factoryloader: Got keys from plugin meta data QList("windowsvista", "windows11")	
00000040	0.01973210	[12596] qt.core.library: "C:MyApp/Release/styles/qmodernwindowsstyle.dll" loaded library
00000041	0.16023430	[12596] qt.core.plugin.factoryloader: checking directory path "C:MyApp/Release/accessible" ...

After removing just Qt6Core.dll i get the following output and Svgs are visible:

00000001	0.00000000	[22376] qt.core.plugin.factoryloader: checking directory path "C:/Qt/6.8.3/msvc2022_64/plugins/iconengines" ...	
00000002	0.00036150	[22376] qt.core.plugin.factoryloader: looking at "qsvgicon.dll"	
00000003	0.00078680	[22376] qt.core.plugin.loader: Found metadata in lib C:/Qt/6.8.3/msvc2022_64/plugins/iconengines/qsvgicon.dll, metadata=	
00000004	0.00078680	[22376] {	
00000005	0.00078680	[22376]     "IID": "org.qt-project.Qt.QIconEngineFactoryInterface",	
00000006	0.00078680	[22376]     "MetaData": {	
00000007	0.00078680	[22376]         "Keys": [	
00000008	0.00078680	[22376]             "svg",	
00000009	0.00078680	[22376]             "svgz",	
00000010	0.00078680	[22376]             "svg.gz"	
00000011	0.00078680	[22376]         ]	
00000012	0.00078680	[22376]     },	
00000013	0.00078680	[22376]     "archlevel": 0,	
00000014	0.00078680	[22376]     "className": "QSvgIconPlugin",	
00000015	0.00078680	[22376]     "debug": false,	
00000016	0.00078680	[22376]     "version": 395264	
00000017	0.00078680	[22376] }	
00000018	0.00078680	[22376] 	
00000019	0.00078680	[22376] 	
00000020	0.00081450	[22376] qt.core.plugin.factoryloader: Got keys from plugin meta data QList("svg", "svgz", "svg.gz")	
00000021	0.00091490	[22376] qt.core.plugin.factoryloader: looking at "qsvgicond.dll"	
00000022	0.00125860	[22376] qt.core.plugin.loader: Found metadata in lib C:/Qt/6.8.3/msvc2022_64/plugins/iconengines/qsvgicond.dll, metadata=	
00000023	0.00125860	[22376] {	
00000024	0.00125860	[22376]     "IID": "org.qt-project.Qt.QIconEngineFactoryInterface",	
00000025	0.00125860	[22376]     "MetaData": {	
00000026	0.00125860	[22376]         "Keys": [	
00000027	0.00125860	[22376]             "svg",	
00000028	0.00125860	[22376]             "svgz",	
00000029	0.00125860	[22376]             "svg.gz"	
00000030	0.00125860	[22376]         ]	
00000031	0.00125860	[22376]     },	
00000032	0.00125860	[22376]     "archlevel": 0,	
00000033	0.00125860	[22376]     "className": "QSvgIconPlugin",	
00000034	0.00125860	[22376]     "debug": true,	
00000035	0.00125860	[22376]     "version": 395264	
00000036	0.00125860	[22376] }	
00000037	0.00125860	[22376] 	
00000038	0.00125860	[22376] 	
00000039	0.00132440	[22376] qt.core.plugin.factoryloader: "The plugin 'C:/Qt/6.8.3/msvc2022_64/plugins/iconengines/qsvgicond.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 	
00000040	0.00132440	[22376]          not a plugin	
00000041	0.00236260	[22376] qt.core.library: "C:/Qt/6.8.3/msvc2022_64/plugins/iconengines/qsvgicon.dll" loaded library	
00000042	0.00559850	[22376] qt.svg: Cannot open file ':/icons/svgs/home_d.svg', because: No such file or directory	
00000043	0.00568700	[22376] qt.svg: Cannot open file ':/icons/svgs/home_d.svg', because: No such file or directory
00000044	0.01221300	[22376] qt.core.plugin.factoryloader: checking directory path "C:/Qt/6.8.3/msvc2022_64/plugins/imageformats" ...	
00000045	0.01243850	[22376] qt.core.plugin.factoryloader: looking at "qgif.dll"	
00000046	0.01277140	[22376] qt.core.plugin.loader: Found metadata in lib C:/Qt/6.8.3/msvc2022_64/plugins/imageformats/qgif.dll, metadata=	
00000047	0.01277140	[22376] {	
00000048	0.01277140	[22376]     "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",	
00000049	0.01277140	[22376]     "MetaData": {	
00000050	0.01277140	[22376]         "Keys": [	
00000051	0.01277140	[22376]             "gif"	
00000052	0.01277140	[22376]         ],	
00000053	0.01277140	[22376]         "MimeTypes": [	
00000054	0.01277140	[22376]             "image/gif"	
00000055	0.01277140	[22376]         ]	
00000056	0.01277140	[22376]     },	
00000057	0.01277140	[22376]     "archlevel": 0,	
00000058	0.01277140	[22376]     "className": "QGifPlugin",	
00000059	0.01277140	[22376]     "debug": false,	
00000060	0.01277140	[22376]     "version": 395264	
00000061	0.01277140	[22376] }	
00000062	0.01277140	[22376] 	
00000063	0.01277140	[22376] 	
00000064	0.01278460	[22376] qt.core.plugin.factoryloader: Got keys from plugin meta data QList("gif")	
00000065	0.01288420	[22376] qt.core.plugin.factoryloader: looking at "qgifd.dll"	
00000066	0.01320970	[22376] qt.core.plugin.loader: Found metadata in lib C:/Qt/6.8.3/msvc2022_64/plugins/imageformats/qgifd.dll, metadata=	
00000067	0.01320970	[22376] {	
00000068	0.01320970	[22376]     "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",	
00000069	0.01320970	[22376]     "MetaData": {	
00000070	0.01320970	[22376]         "Keys": [	
00000071	0.01320970	[22376]             "gif"	
00000072	0.01320970	[22376]         ],	
00000073	0.01320970	[22376]         "MimeTypes": [	
00000074	0.01320970	[22376]             "image/gif"	
00000075	0.01320970	[22376]         ]	
00000076	0.01320970	[22376]     },	
00000077	0.01320970	[22376]     "archlevel": 0,	
00000078	0.01320970	[22376]     "className": "QGifPlugin",	
00000079	0.01320970	[22376]     "debug": true,	
00000080	0.01320970	[22376]     "version": 395264	
00000081	0.01320970	[22376] }	
00000082	0.01320970	[22376] 	
00000083	0.01320970	[22376] 	
00000084	0.01327890	[22376] qt.core.plugin.factoryloader: "The plugin 'C:/Qt/6.8.3/msvc2022_64/plugins/imageformats/qgifd.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 	
00000085	0.01327890	[22376]          not a plugin	
00000086	0.01331110	[22376] qt.core.plugin.factoryloader: looking at "qicns.dll"	
00000087	0.01363050	[22376] qt.core.plugin.loader: Found metadata in lib C:/Qt/6.8.3/msvc2022_64/plugins/imageformats/qicns.dll, metadata=	
00000088	0.01363050	[22376] {	
00000089	0.01363050	[22376]     "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",	
00000090	0.01363050	[22376]     "MetaData": {	
00000091	0.01363050	[22376]         "Keys": [	
00000092	0.01363050	[22376]             "icns"	
00000093	0.01363050	[22376]         ],	
00000094	0.01363050	[22376]         "MimeTypes": [	
00000095	0.01363050	[22376]             "image/x-icns"	
00000096	0.01363050	[22376]         ]	
00000097	0.01363050	[22376]     },	
00000098	0.01363050	[22376]     "archlevel": 0,	
00000099	0.01363050	[22376]     "className": "QICNSPlugin",	
00000100	0.01363050	[22376]     "debug": false,	
00000101	0.01363050	[22376]     "version": 395264	
00000102	0.01363050	[22376] }	
00000103	0.01363050	[22376] 	
00000104	0.01363050	[22376] 	

00000219	0.01663810	[22376] qt.core.plugin.factoryloader: "The plugin 'C:/Qt/6.8.3/msvc2022_64/plugins/imageformats/qjpegd.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 	
00000220	0.01663810	[22376]          not a plugin	
00000221	0.01673280	[22376] qt.core.plugin.factoryloader: looking at "qsvg.dll"	
00000222	0.01702520	[22376] qt.core.plugin.loader: Found metadata in lib C:/Qt/6.8.3/msvc2022_64/plugins/imageformats/qsvg.dll, metadata=	
00000223	0.01702520	[22376] {	
00000224	0.01702520	[22376]     "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",	
00000225	0.01702520	[22376]     "MetaData": {	
00000226	0.01702520	[22376]         "Keys": [	
00000227	0.01702520	[22376]             "svg",	
00000228	0.01702520	[22376]             "svgz"	
00000229	0.01702520	[22376]         ],	
00000230	0.01702520	[22376]         "MimeTypes": [	
00000231	0.01702520	[22376]             "image/svg+xml",	
00000232	0.01702520	[22376]             "image/svg+xml-compressed"	
00000233	0.01702520	[22376]         ]	
00000234	0.01702520	[22376]     },	
00000235	0.01702520	[22376]     "archlevel": 0,	
00000236	0.01702520	[22376]     "className": "QSvgPlugin",	
00000237	0.01702520	[22376]     "debug": false,	
00000238	0.01702520	[22376]     "version": 395264	
00000239	0.01702520	[22376] }	
00000240	0.01702520	[22376] 	
00000241	0.01702520	[22376] 	
00000242	0.01706840	[22376] qt.core.plugin.factoryloader: Got keys from plugin meta data QList("svg", "svgz")	
00000243	0.01713190	[22376] qt.core.plugin.factoryloader: looking at "qsvgd.dll"	
00000244	0.01745690	[22376] qt.core.plugin.loader: Found metadata in lib C:/Qt/6.8.3/msvc2022_64/plugins/imageformats/qsvgd.dll, metadata=	
00000245	0.01745690	[22376] {	
00000246	0.01745690	[22376]     "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",	
00000247	0.01745690	[22376]     "MetaData": {	
00000248	0.01745690	[22376]         "Keys": [	
00000249	0.01745690	[22376]             "svg",	
00000250	0.01745690	[22376]             "svgz"	
00000251	0.01745690	[22376]         ],	
00000252	0.01745690	[22376]         "MimeTypes": [	
00000253	0.01745690	[22376]             "image/svg+xml",	
00000254	0.01745690	[22376]             "image/svg+xml-compressed"	
00000255	0.01745690	[22376]         ]	
00000256	0.01745690	[22376]     },	
00000257	0.01745690	[22376]     "archlevel": 0,	
00000258	0.01745690	[22376]     "className": "QSvgPlugin",	
00000259	0.01745690	[22376]     "debug": true,	
00000260	0.01745690	[22376]     "version": 395264	
00000261	0.01745690	[22376] }	
00000262	0.01745690	[22376] 	
00000263	0.01745690	[22376] 	
00000264	0.01750020	[22376] qt.core.plugin.factoryloader: "The plugin 'C:/Qt/6.8.3/msvc2022_64/plugins/imageformats/qsvgd.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 	
00000265	0.01750020	[22376]          not a plugin	
00000266	0.01757380	[22376] qt.core.plugin.factoryloader: looking at "qtga.dll"	
00000267	0.01789780	[22376] qt.core.plugin.loader: Found metadata in lib C:/Qt/6.8.3/msvc2022_64/plugins/imageformats/qtga.dll, metadata=	
00000268	0.01789780	[22376] {	
00000269	0.01789780	[22376]     "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",	
00000270	0.01789780	[22376]     "MetaData": {	
00000271	0.01789780	[22376]         "Keys": [	
00000272	0.01789780	[22376]             "tga"	
00000273	0.01789780	[22376]         ],	
00000274	0.01789780	[22376]         "MimeTypes": [	
00000275	0.01789780	[22376]             "image/x-tga"	
00000276	0.01789780	[22376]         ]	
00000277	0.01789780	[22376]     },	
00000278	0.01789780	[22376]     "archlevel": 0,	
00000279	0.01789780	[22376]     "className": "QTgaPlugin",	
00000280	0.01789780	[22376]     "debug": false,	
00000281	0.01789780	[22376]     "version": 395264	
00000282	0.01789780	[22376] }	
00000283	0.01789780	[22376] 	
00000284	0.01789780	[22376] 	

00000434	0.02150560	[22376] qt.core.library: "C:/Qt/6.8.3/msvc2022_64/plugins/imageformats/qgif.dll" loaded library	
00000435	0.02192430	[22376] qt.core.library: "C:/Qt/6.8.3/msvc2022_64/plugins/imageformats/qicns.dll" loaded library	
00000436	0.02233230	[22376] qt.core.library: "C:/Qt/6.8.3/msvc2022_64/plugins/imageformats/qico.dll" loaded library	
00000437	0.02279800	[22376] qt.core.library: "C:/Qt/6.8.3/msvc2022_64/plugins/imageformats/qjpeg.dll" loaded library	
00000438	0.02319700	[22376] qt.core.library: "C:/Qt/6.8.3/msvc2022_64/plugins/imageformats/qsvg.dll" loaded library	
00000439	0.02362360	[22376] qt.core.library: "C:/Qt/6.8.3/msvc2022_64/plugins/imageformats/qtga.dll" loaded library	
00000440	0.02404040	[22376] qt.core.library: "C:/Qt/6.8.3/msvc2022_64/plugins/imageformats/qtiff.dll" loaded library	
00000441	0.02441960	[22376] qt.core.library: "C:/Qt/6.8.3/msvc2022_64/plugins/imageformats/qwbmp.dll" loaded library	
00000442	0.02483440	[22376] qt.core.library: "C:/Qt/6.8.3/msvc2022_64/plugins/imageformats/qwebp.dll" loaded library	
00000443	0.04005290	[22376] qt.core.plugin.factoryloader: checking directory path "C:/Qt/6.8.3/msvc2022_64/plugins/platforms" ...	

00000547	0.04288690	[22376] qt.core.plugin.factoryloader: "The plugin 'C:/Qt/6.8.3/msvc2022_64/plugins/platforms/qoffscreend.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 	
00000548	0.04288690	[22376]          not a plugin	
00000549	0.04295060	[22376] qt.core.plugin.factoryloader: looking at "qwindows.dll"	
00000550	0.04326960	[22376] qt.core.plugin.loader: Found metadata in lib C:/Qt/6.8.3/msvc2022_64/plugins/platforms/qwindows.dll, metadata=	
00000551	0.04326960	[22376] {	
00000552	0.04326960	[22376]     "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",	
00000553	0.04326960	[22376]     "MetaData": {	
00000554	0.04326960	[22376]         "Keys": [	
00000555	0.04326960	[22376]             "windows"	
00000556	0.04326960	[22376]         ]	
00000557	0.04326960	[22376]     },	
00000558	0.04326960	[22376]     "archlevel": 0,	
00000559	0.04326960	[22376]     "className": "QWindowsIntegrationPlugin",	
00000560	0.04326960	[22376]     "debug": false,	
00000561	0.04326960	[22376]     "version": 395264	
00000562	0.04326960	[22376] }	
00000563	0.04326960	[22376] 	
00000564	0.04326960	[22376] 	
00000565	0.04331650	[22376] qt.core.plugin.factoryloader: Got keys from plugin meta data QList("windows")	
00000566	0.04338000	[22376] qt.core.plugin.factoryloader: looking at "qwindowsd.dll"	
00000567	0.04370960	[22376] qt.core.plugin.loader: Found metadata in lib C:/Qt/6.8.3/msvc2022_64/plugins/platforms/qwindowsd.dll, metadata=	
00000568	0.04370960	[22376] {	
00000569	0.04370960	[22376]     "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",	
00000570	0.04370960	[22376]     "MetaData": {	
00000571	0.04370960	[22376]         "Keys": [	
00000572	0.04370960	[22376]             "windows"	
00000573	0.04370960	[22376]         ]	
00000574	0.04370960	[22376]     },	
00000575	0.04370960	[22376]     "archlevel": 0,	
00000576	0.04370960	[22376]     "className": "QWindowsIntegrationPlugin",	
00000577	0.04370960	[22376]     "debug": true,	
00000578	0.04370960	[22376]     "version": 395264	
00000579	0.04370960	[22376] }	
00000580	0.04370960	[22376] 	
00000581	0.04370960	[22376] 	
00000582	0.04376890	[22376] qt.core.plugin.factoryloader: "The plugin 'C:/Qt/6.8.3/msvc2022_64/plugins/platforms/qwindowsd.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 	
00000583	0.04376890	[22376]          not a plugin	
00000584	0.04381430	[22376] qt.core.plugin.factoryloader: checking directory path "C:/MyApp/Release/platforms" ...	
00000585	0.04399180	[22376] qt.core.plugin.factoryloader: looking at "qwindows.dll"	
00000586	0.04431980	[22376] qt.core.plugin.loader: Found metadata in lib C:/MyApp/Release/platforms/qwindows.dll, metadata=	
00000587	0.04431980	[22376] {	
00000588	0.04431980	[22376]     "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",	
00000589	0.04431980	[22376]     "MetaData": {	
00000590	0.04431980	[22376]         "Keys": [	
00000591	0.04431980	[22376]             "windows"	
00000592	0.04431980	[22376]         ]	
00000593	0.04431980	[22376]     },	
00000594	0.04431980	[22376]     "archlevel": 0,	
00000595	0.04431980	[22376]     "className": "QWindowsIntegrationPlugin",	
00000596	0.04431980	[22376]     "debug": false,	
00000597	0.04431980	[22376]     "version": 395264	
00000598	0.04431980	[22376] }	
00000599	0.04431980	[22376] 	
00000600	0.04431980	[22376] 	
00000601	0.04436740	[22376] qt.core.plugin.factoryloader: Got keys from plugin meta data QList("windows")	
00000602	0.04793650	[22376] qt.core.library: "C:/Qt/6.8.3/msvc2022_64/plugins/platforms/qwindows.dll" loaded library	
00000603	0.05694330	[22376] qt.core.plugin.factoryloader: checking directory path "C:/Qt/6.8.3/msvc2022_64/plugins/platformthemes" ...	
00000604	0.05705440	[22376] qt.core.plugin.factoryloader: checking directory path "C:/MyApp/Release/platformthemes" ...	
00000605	0.06228320	[22376] qt.core.plugin.factoryloader: checking directory path "C:/Qt/6.8.3/msvc2022_64/plugins/styles" ...	
00000606	0.06254280	[22376] qt.core.plugin.factoryloader: looking at "qmodernwindowsstyle.dll"	
00000607	0.06293260	[22376] qt.core.plugin.loader: Found metadata in lib C:/Qt/6.8.3/msvc2022_64/plugins/styles/qmodernwindowsstyle.dll, metadata=	
00000608	0.06293260	[22376] {	
00000609	0.06293260	[22376]     "IID": "org.qt-project.Qt.QStyleFactoryInterface",	
00000610	0.06293260	[22376]     "MetaData": {	
00000611	0.06293260	[22376]         "Keys": [	
00000612	0.06293260	[22376]             "windowsvista",	
00000613	0.06293260	[22376]             "windows11"	
00000614	0.06293260	[22376]         ]	
00000615	0.06293260	[22376]     },	
00000616	0.06293260	[22376]     "archlevel": 0,	
00000617	0.06293260	[22376]     "className": "QModernWindowsStylePlugin",	
00000618	0.06293260	[22376]     "debug": false,	
00000619	0.06293260	[22376]     "version": 395264	
00000620	0.06293260	[22376] }	
00000621	0.06293260	[22376] 	
00000622	0.06293260	[22376] 	
00000623	0.06300010	[22376] qt.core.plugin.factoryloader: Got keys from plugin meta data QList("windowsvista", "windows11")	
00000624	0.06307810	[22376] qt.core.plugin.factoryloader: looking at "qmodernwindowsstyled.dll"	
00000625	0.06342930	[22376] qt.core.plugin.loader: Found metadata in lib C:/Qt/6.8.3/msvc2022_64/plugins/styles/qmodernwindowsstyled.dll, metadata=	
00000626	0.06342930	[22376] {	
00000627	0.06342930	[22376]     "IID": "org.qt-project.Qt.QStyleFactoryInterface",	
00000628	0.06342930	[22376]     "MetaData": {	
00000629	0.06342930	[22376]         "Keys": [	
00000630	0.06342930	[22376]             "windowsvista",	
00000631	0.06342930	[22376]             "windows11"	
00000632	0.06342930	[22376]         ]	
00000633	0.06342930	[22376]     },	
00000634	0.06342930	[22376]     "archlevel": 0,	
00000635	0.06342930	[22376]     "className": "QModernWindowsStylePlugin",	
00000636	0.06342930	[22376]     "debug": true,	
00000637	0.06342930	[22376]     "version": 395264	
00000638	0.06342930	[22376] }	
00000639	0.06342930	[22376] 	
00000640	0.06342930	[22376] 	
00000641	0.06345430	[22376] qt.core.plugin.factoryloader: "The plugin 'C:/Qt/6.8.3/msvc2022_64/plugins/styles/qmodernwindowsstyled.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 	
00000642	0.06345430	[22376]          not a plugin	
00000643	0.06353520	[22376] qt.core.plugin.factoryloader: checking directory path "C:/MyApp/Release/styles" ...	
00000644	0.06371620	[22376] qt.core.plugin.factoryloader: looking at "qmodernwindowsstyle.dll"	
00000645	0.06407070	[22376] qt.core.plugin.loader: Found metadata in lib C:/MyApp/Release/styles/qmodernwindowsstyle.dll, metadata=	
00000646	0.06407070	[22376] {	
00000647	0.06407070	[22376]     "IID": "org.qt-project.Qt.QStyleFactoryInterface",	
00000648	0.06407070	[22376]     "MetaData": {	
00000649	0.06407070	[22376]         "Keys": [	
00000650	0.06407070	[22376]             "windowsvista",	
00000651	0.06407070	[22376]             "windows11"	
00000652	0.06407070	[22376]         ]	
00000653	0.06407070	[22376]     },	
00000654	0.06407070	[22376]     "archlevel": 0,	
00000655	0.06407070	[22376]     "className": "QModernWindowsStylePlugin",	
00000656	0.06407070	[22376]     "debug": false,	
00000657	0.06407070	[22376]     "version": 395264	
00000658	0.06407070	[22376] }	
00000659	0.06407070	[22376] 	
00000660	0.06407070	[22376] 	
00000661	0.06414740	[22376] qt.core.plugin.factoryloader: Got keys from plugin meta data QList("windowsvista", "windows11")	
00000662	0.06474840	[22376] qt.core.library: "C:/Qt/6.8.3/msvc2022_64/plugins/styles/qmodernwindowsstyle.dll" loaded library	
00000663	0.53852439	[22376] qt.core.plugin.factoryloader: checking directory path "C:/Qt/6.8.3/msvc2022_64/plugins/accessible" ...	
00000664	0.53873122	[22376] qt.core.plugin.factoryloader: checking directory path "C:/MyApp/Release/accessible" ...

it seems to just not care about svgs.

The Qt6Core.dll i removed was tagged with 6.8.3 just like every other Qt-dll in my release folder

Christian Ehrlicher

@Ja_n said in Qt 6.8.2 Application does not show SVGs when deployed:

I added my Qt installation to PATH and when i click my Application i get (no SVGs visible):

Why do you add Qt to your PATH? I told you not to do...

Ja_n

I found my solution (without Qt in PATH):

This does not work:

QIcon i(":/SvgTest/help_h.svg");

SvgTest::SvgTest(QWidget *parent) : QWidget(parent)
{
	lay = new QVBoxLayout(this);
	l = new QPushButton("hi",this);
	lay->addWidget(l);
	l->setIcon(i);
}

This does work:

QIcon* i = nullptr;

SvgTest::SvgTest(QWidget *parent) : QWidget(parent)
{
	lay = new QVBoxLayout(this);
	l = new QPushButton("hi",this);
	lay->addWidget(l);
	i = new QIcon(":/SvgTest/help_h.svg");
	l->setIcon(*i);
}

I guess there is something like QApplication has to be created first?

JonB

@Ja_n
Without a QApplication currently instantiated I imagine code cannot resolve :/SvgTest/help_h.svg? In your original case did you check QIcon::isNull() prior to attempting to use it? In general you should not try to create global UI objects (like your QIcon i(...)) in code, these are instantiated before your main() is even entered or a QApplication has been created, it often leads to impenetrable error messages.

Ja_n

I did not check isNull(). It would have been true. But i dont understand why it changed when i deleted Qt6Core.dll.

JonB

@Ja_n
I don't know, but the immediate suspicion is that it uses an external Qt6core.dll which it finds somewhere else and is not the same as the one copied by windeployqt. Search your whole disk for Qt6core*.dll?

I don't know how QIcon sits in this, but I still would not create an external QIcon(....) prior to QApplication. I don't know whether it tries to to resolve the path/create the icon at construction rather than usage time, but a runtime call to new QIcon(":/SvgTest/help_h.svg") after QApplication instantiation seems much safer.

Christian Ehrlicher

a new QIcon() is wrong in 99,9% of all cases. No need to create it on the heap (and leak it afterwards). And it's for sure not the solution for your problem. You have a mix of different Qt dlls in your PATH.

Ja_n

I’d prefer not to put all my icons on the heap, but I tested my 'solution' in Windows Sandbox and the behavior is exactly the same. There is no Qt in my PATH. I checked every entry in PATH and none contain any Qt DLLs. The only way Qt gets into my PATH is via Visual Studio. If you search my logs for "dll" there are only C:/Qt/6.8.3/msvc2022_64 and C:/MyApp/Release — that’s it.

JonB

@Christian-Ehrlicher
Would you care to comment on how, say, QIcon(":/SvgTest/help_h.svg") behaves if called before a QApplication has been created? The OP's code simply shows this as a global variable, cannot tell whether this is what they really have. Do :-paths really get resolved without a QApplication object??

Christian Ehrlicher

@JonB said in Qt 6.8.2 Application does not show SVGs when deployed:

QIcon(":/SvgTest/help_h.svg") behaves if called before a QApplication has been created?

I would say it doesn't work as the resource system is not yet properly set up. But I would have to try it out to be sure.

JonB

@Christian-Ehrlicher That was my guess too :)