QImageIOPlugin doesn't work

[sandro4912]

I get this error on startup:

"The plugin 'E:/Qt/5.12.2/msvc2017/plugins/imageformats/textimage1.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 
         not a plugin
QFactoryLoader::QFactoryLoader() checking directory path "E:/Cpp_Projekte/QT/Foundations_of_QT/CH11_image_plugin/read/build-read-Desktop_Qt_5_12_2_MSVC2017_32bit-Debug/debug/imageformats" ...
loaded library "E:/Qt/5.12.2/msvc2017/plugins/imageformats/qgifd.dll"
loaded library "E:/Qt/5.12.2/msvc2017/plugins/imageformats/qicnsd.dll"
loaded library "E:/Qt/5.12.2/msvc2017/plugins/imageformats/qicod.dll"
loaded library "E:/Qt/5.12.2/msvc2017/plugins/imageformats/qjpegd.dll"
loaded library "E:/Qt/5.12.2/msvc2017/plugins/imageformats/qsvgd.dll"
loaded library "E:/Qt/5.12.2/msvc2017/plugins/imageformats/qtgad.dll"
loaded library "E:/Qt/5.12.2/msvc2017/plugins/imageformats/qtiffd.dll"
loaded library "E:/Qt/5.12.2/msvc2017/plugins/imageformats/qwbmpd.dll"
loaded library "E:/Qt/5.12.2/msvc2017/plugins/imageformats/qwebpd.dll"

I build the plugin and the project with MSVC2017 32 Bit Debug to get the Debug Output. There should not be a mix?

The output of the plugin file looks like this:

22:57:44: Running steps for project image_plugin...
22:57:44: Configuration unchanged, skipping qmake step.
22:57:44: Starting: "E:\Qt\Tools\QtCreator\bin\jom.exe" install
	E:\Qt\Tools\QtCreator\bin\jom.exe -f Makefile.Release install
	copy /y release\textimage1.dll E:\Qt\5.12.2\msvc2017\plugins\imageformats\textimage1.dll
        1 Datei(en) kopiert.
22:57:44: The process "E:\Qt\Tools\QtCreator\bin\jom.exe" exited normally.
22:57:44: Elapsed time: 00:00.

[Christian Ehrlicher]

@sandro4912 said in QImageIOPlugin doesn't work:

copy /y release\textimage1.dll E:\Qt\5.12.2\msvc2017\plugins\imageformats\textimage1.dll

This does not look like a debug build.

[SGaist]

Your plugin is named: textimage1.dll It is missing the d suffix for your debug build.

You can use TARGET = $$qtLibraryTarget(textimage)

[sandro4912]

Than i wonder why it is not build as debug.

I clearly select debug and then build:

The build settings for debug:

I already removed the release flag from CONFIG so it should not get forced into release or should it?

TEMPLATE = lib
CONFIG += plugin
TARGET = $$qtLibraryTarget(textimage)
VERSION = 1.0.0

HEADERS += \
    textimagehandler.h \
    textimageplugin.h

SOURCES += \
    textimagehandler.cpp \
    textimageplugin.cpp

target.path += $$[QT_INSTALL_PLUGINS]/imageformats
INSTALLS += target

DISTFILES += \
    textimageplugin.json

What does TARGET = $$qtLibraryTarget(textimage) do? why is it needed?

[aha_1980]

@sandro4912

Your plugin is named: textimage1.dll It is missing the d suffix for your debug build.

On Windows, the library must be called textimage1d.dll if it is a debug version. The reason was already explained above: On Windows, you cannot mix debug and release objects.

[sandro4912]

Ok but were do i change the name with the d suffix? In the pro file? Or can i just rename it manually?

[Christian Ehrlicher]

@sandro4912 said in QImageIOPlugin doesn't work:

Ok but were do i change the name with the d suffix? In the pro file? Or can i just rename it manually?

Simply read @SGaist 's answer: 'You can use TARGET = $$qtLibraryTarget(textimage)'

[sandro4912]

I added the target but it doesn't seem to add the d suffix to make it debug:

TEMPLATE = lib
CONFIG += plugin
VERSION = 1.0.0

HEADERS += \
    textimagehandler.h \
    textimageplugin.h

SOURCES += \
    textimagehandler.cpp \
    textimageplugin.cpp

TARGET = $$qtLibraryTarget(textimage)
target.path += $$[QT_INSTALL_PLUGINS]/imageformats
INSTALLS += target

DISTFILES += \
    textimageplugin.json

[SGaist]

Did you re-run qmake after changing the TARGET value ?

[sandro4912]

Ok i guess i forgot to rerun it. Now i could generate the debug files.

When running my testprogram with debug it stills fails but the message is different

Got keys from plugin meta data ()
QFactoryLoader::QFactoryLoader() checking directory path "E:/Cpp_Projekte/QT/Foundations_of_QT/CH11_image_plugin/read/build-read-Desktop_Qt_5_12_2_MSVC2017_32bit-Debug/debug/imageformats" ...
loaded library "E:/Qt/5.12.2/msvc2017/plugins/imageformats/qgifd.dll"
loaded library "E:/Qt/5.12.2/msvc2017/plugins/imageformats/qicnsd.dll"
loaded library "E:/Qt/5.12.2/msvc2017/plugins/imageformats/qicod.dll"
loaded library "E:/Qt/5.12.2/msvc2017/plugins/imageformats/qjpegd.dll"
loaded library "E:/Qt/5.12.2/msvc2017/plugins/imageformats/qsvgd.dll"
loaded library "E:/Qt/5.12.2/msvc2017/plugins/imageformats/qtgad.dll"
loaded library "E:/Qt/5.12.2/msvc2017/plugins/imageformats/qtiffd.dll"
loaded library "E:/Qt/5.12.2/msvc2017/plugins/imageformats/qwbmpd.dll"
loaded library "E:/Qt/5.12.2/msvc2017/plugins/imageformats/qwebpd.dll"
"bmp"
"cur"
"gif"
"icns"
"ico"
"jpeg"
"jpg"
"pbm"
"pgm"
"png"
"ppm"
"svg"
"svgz"
"tga"
"tif"
"tiff"
"wbmp"
"webp"
"xbm"
"xpm"
Failed to load.
QLibraryPrivate::unload succeeded on "E:/Qt/5.12.2/msvc2017/plugins/styles/qwindowsvistastyled.dll" 
QLibraryPrivate::unload succeeded on "E:/Qt/5.12.2/msvc2017/plugins/imageformats/qgifd.dll" 
QLibraryPrivate::unload succeeded on "E:/Qt/5.12.2/msvc2017/plugins/imageformats/qicnsd.dll" 
QLibraryPrivate::unload succeeded on "E:/Qt/5.12.2/msvc2017/plugins/imageformats/qicod.dll" 
QLibraryPrivate::unload succeeded on "E:/Qt/5.12.2/msvc2017/plugins/imageformats/qjpegd.dll" 
QLibraryPrivate::unload succeeded on "E:/Qt/5.12.2/msvc2017/plugins/imageformats/qsvgd.dll" 
QLibraryPrivate::unload succeeded on "E:/Qt/5.12.2/msvc2017/plugins/imageformats/qtgad.dll" 
QLibraryPrivate::unload succeeded on "E:/Qt/5.12.2/msvc2017/plugins/imageformats/qtiffd.dll" 
QLibraryPrivate::unload succeeded on "E:/Qt/5.12.2/msvc2017/plugins/imageformats/qwbmpd.dll" 
QLibraryPrivate::unload succeeded on "E:/Qt/5.12.2/msvc2017/plugins/imageformats/qwebpd.dll" 
QLibraryPrivate::unload succeeded on "E:/Qt/5.12.2/msvc2017/plugins/platforms/qwindowsd.dll"

let me know if you need more information...