QPixmap bug under Qt4.3.1 ?

[Nyphel]

Hello,

I use Qt 4.3.1 OpenSource Edition on Windows XP Pro SP2 32bits.
My application has an interface with a QLabel.
My objective is to post an image, also I display it in the QLabel using a QPixmap.

int hauteur_jaquette = (tree->height ()) /2; // 50% of the height of the interface
 
QPixmap jaquette_pixmap;
jaquette_pixmap.load (acces_jaquette); // Loading of the image in QPixmap
jaquette_pixmap = jaquette_pixmap.scaledToHeight (hauteur_jaquette, Qt:: SmoothTransformation); // Scaling the image
 
label_jaquette->setPixmap (jaquette_pixmap); // Posting of QPixmap (and thus of the image) in the QLabel of the interface

int hauteur_jaquette = (tree->height ()) /2; // 50% of the height of the interface

QPixmap jaquette_pixmap;
jaquette_pixmap.load (acces_jaquette); // Loading of the image in QPixmap
jaquette_pixmap = jaquette_pixmap.scaledToHeight (hauteur_jaquette, Qt:: SmoothTransformation); // Scaling the image

label_jaquette->setPixmap (jaquette_pixmap); // Posting of QPixmap (and thus of the image) in the QLabel of the interface

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That functions perfectly with the version OpenSource of Qt distribuated by Trolltech.
However, if I reconfigure Qt in static mode (configures static, make sub-src) and if I recompile my project, then the image is not displayed any more…

Would somebody have an idea, a council, a suggestion ?

[jpn]

And the image is in which format? Try PNG..?

[Nyphel]

The image is downloaded from the web before to be displayed, so it's generally .jpg and sometimes .gif

So I don't know if I can convert it to .png from my application, but I'll test some .png images to understand well the problem.

Thanks for this tip

[jpn]

First of all, make sure your Qt was built with GIF and JPG support (configure script outputs detailed information about this, after qmake has been compiled, before reading all the .pro files). Secondly, since you're using static Qt, you will have to import static plugins:

.pro:

QTPLUGIN += qjpeg

main.cpp:

Q_IMPORT_PLUGIN(qjpeg)

More info: http://doc.trolltech.com/latest/qtpl..._IMPORT_PLUGIN

[Nyphel]

Thanks !

So, if I understood well, I've to re-configure Qt with the following options :
-relase
-static
-qt-libgif
-qt-libpng (instead of the default option : -system-libpng)
-qt-libjpeg (instead of the default option : -system-libjpeg)

Next, I'll add "Q_IMPORT_PLUGIN(qjpeg)" (without ";" ?) at the top of my class .cpp and "QTPLUGIN += qgif qpng qjpeg" in my .pro file.

That's right ?

[Nyphel]

I've re-configured and re-built (make sub-src) my Qt4.3.1 OpenSource edition for Windows with the options that were listed above.
I got no errors, no warning.

Here is my .pro file :

TEMPLATE = app
TARGET = Listeur
QT += core \
    gui \
    network
HEADERS += Thread_existing_files.h \
    Thread_HTTP_VC.h \
    Thread_HTTP_MC.h \
    Thread_HTTP_AC.h \
    Thread_HTTP_QLCS.h \
    Listeur.h \
    Thread_scanneur.h \
    donnee.h \
    interface.h \
    interface_impl.h
SOURCES += Thread_existing_files.cpp \
    Thread_HTTP_VC.cpp \
    Thread_HTTP_MC.cpp \
    Thread_HTTP_AC.cpp \
    Thread_HTTP_QLCS.cpp \
    Listeur.cpp \
    Thread_scanneur.cpp \
    donnee.cpp \
    interface_impl.cpp \
    main.cpp
FORMS += interface.ui
QTPLUGIN += qgif \
    qjpeg

TEMPLATE = app
TARGET = Listeur
QT += core \
    gui \
    network
HEADERS += Thread_existing_files.h \
    Thread_HTTP_VC.h \
    Thread_HTTP_MC.h \
    Thread_HTTP_AC.h \
    Thread_HTTP_QLCS.h \
    Listeur.h \
    Thread_scanneur.h \
    donnee.h \
    interface.h \
    interface_impl.h
SOURCES += Thread_existing_files.cpp \
    Thread_HTTP_VC.cpp \
    Thread_HTTP_MC.cpp \
    Thread_HTTP_AC.cpp \
    Thread_HTTP_QLCS.cpp \
    Listeur.cpp \
    Thread_scanneur.cpp \
    donnee.cpp \
    interface_impl.cpp \
    main.cpp
FORMS += interface.ui
QTPLUGIN += qgif \
    qjpeg

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Here is my main.cpp :

#include "Listeur.h"
 
#include <QtPlugin>
Q_IMPORT_PLUGIN(qjpeg)
Q_IMPORT_PLUGIN(qgif)
 
int main(int argc, char *argv[])
{	
    QApplication app(argc, argv);
 
	Listeur * mon_listeur = new Listeur();
 
    return app.exec();
}

#include "Listeur.h"

#include <QtPlugin>
Q_IMPORT_PLUGIN(qjpeg)
Q_IMPORT_PLUGIN(qgif)

int main(int argc, char *argv[])
{	
    QApplication app(argc, argv);

	Listeur * mon_listeur = new Listeur();

    return app.exec();
}

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When I build my application, using "qmake" an "make", I get the following error message :

D:\Applications\Qt\4.3.1\Workspace\Listeur>qmake
 
D:\Applications\Qt\4.3.1\Workspace\Listeur>make
mingw32-make -f Makefile.Release
mingw32-make[1]: Entering directory `D:/Applications/Qt/4.3.1/Workspace/Listeur'
 
g++ -c -O2 -Wall -fno-exceptions -fno-rtti -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT
_NO_DEBUG -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -DQT_THREAD_SUPPORT -DQT_N
EEDS_QMAIN -I"..\..\include\QtCore" -I"..\..\include\QtCore" -I"..\..\include\Qt
Network" -I"..\..\include\QtNetwork" -I"..\..\include\QtGui" -I"..\..\include\Qt
Gui" -I"..\..\include" -I"..\..\include\ActiveQt" -I"tmp\moc\release_static" -I"
." -I"..\..\mkspecs\win32-g++" -o tmp\obj\release_static\main.o main.cpp
main.cpp: In function `int qMain(int, char**)':
main.cpp:15: warning: unused variable 'mon_listeur'
g++ -enable-stdcall-fixup -Wl,-enable-auto-import -Wl,-enable-runtime-pseudo-rel
oc -Wl,-s -Wl,-subsystem,windows -o "release\Listeur.exe" object_script.Listeur.
Release  -L"d:\Applications\Qt\4.3.1\lib" -L"d:\Applications\Qt\4.3.1\lib" -lmin
gw32 -lqtmain -LD:/Applications/Qt/4.3.1/plugins/imageformats/ -lqgif4 -LD:/Appl
ications/Qt/4.3.1/plugins/imageformats/ -lqjpeg4 -lQtGui -lQtNetwork -lgdi32 -lc
omdlg32 -loleaut32 -limm32 -lwinmm -lwinspool -lmsimg32 -lQtCore -lkernel32 -lus
er32 -lshell32 -luuid -lole32 -ladvapi32 -lws2_32
./tmp\obj\release_static\main.o(.text+0x83):main.cpp: undefined reference to `qt
_plugin_instance_qjpeg()'
./tmp\obj\release_static\main.o(.text+0xa3):main.cpp: undefined reference to `qt
_plugin_instance_qgif()'
collect2: ld returned 1 exit status
mingw32-make[1]: *** [release\Listeur.exe] Error 1
mingw32-make[1]: Leaving directory `D:/Applications/Qt/4.3.1/Workspace/Listeur'
mingw32-make: *** [release] Error 2
 
D:\Applications\Qt\4.3.1\Workspace\Listeur>

D:\Applications\Qt\4.3.1\Workspace\Listeur>qmake

D:\Applications\Qt\4.3.1\Workspace\Listeur>make
mingw32-make -f Makefile.Release
mingw32-make[1]: Entering directory `D:/Applications/Qt/4.3.1/Workspace/Listeur'

g++ -c -O2 -Wall -fno-exceptions -fno-rtti -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT
_NO_DEBUG -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -DQT_THREAD_SUPPORT -DQT_N
EEDS_QMAIN -I"..\..\include\QtCore" -I"..\..\include\QtCore" -I"..\..\include\Qt
Network" -I"..\..\include\QtNetwork" -I"..\..\include\QtGui" -I"..\..\include\Qt
Gui" -I"..\..\include" -I"..\..\include\ActiveQt" -I"tmp\moc\release_static" -I"
." -I"..\..\mkspecs\win32-g++" -o tmp\obj\release_static\main.o main.cpp
main.cpp: In function `int qMain(int, char**)':
main.cpp:15: warning: unused variable 'mon_listeur'
g++ -enable-stdcall-fixup -Wl,-enable-auto-import -Wl,-enable-runtime-pseudo-rel
oc -Wl,-s -Wl,-subsystem,windows -o "release\Listeur.exe" object_script.Listeur.
Release  -L"d:\Applications\Qt\4.3.1\lib" -L"d:\Applications\Qt\4.3.1\lib" -lmin
gw32 -lqtmain -LD:/Applications/Qt/4.3.1/plugins/imageformats/ -lqgif4 -LD:/Appl
ications/Qt/4.3.1/plugins/imageformats/ -lqjpeg4 -lQtGui -lQtNetwork -lgdi32 -lc
omdlg32 -loleaut32 -limm32 -lwinmm -lwinspool -lmsimg32 -lQtCore -lkernel32 -lus
er32 -lshell32 -luuid -lole32 -ladvapi32 -lws2_32
./tmp\obj\release_static\main.o(.text+0x83):main.cpp: undefined reference to `qt
_plugin_instance_qjpeg()'
./tmp\obj\release_static\main.o(.text+0xa3):main.cpp: undefined reference to `qt
_plugin_instance_qgif()'
collect2: ld returned 1 exit status
mingw32-make[1]: *** [release\Listeur.exe] Error 1
mingw32-make[1]: Leaving directory `D:/Applications/Qt/4.3.1/Workspace/Listeur'
mingw32-make: *** [release] Error 2

D:\Applications\Qt\4.3.1\Workspace\Listeur>

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I don't understand how to solve this linking error :s

[jpn]

-qt-libjpeg (instead of the default option : -system-libjpeg)

I suppose both are fine as long as needed libs can be found and configure outputs something like:

JPEG support............plugin

Next, I'll add "Q_IMPORT_PLUGIN(qjpeg)" (without ";" ?) at the top of my class .cpp and "QTPLUGIN += qgif qpng qjpeg" in my .pro file.

That's right ?

Yes, that's right.

[Nyphel]

(Small up, because JPN was writting an answer while I was posting more informations about my problem ^^)

[Nyphel]

Everything looks OK. Strange. See
>objdump.exe -t libqgif4.a
what function are in.
If there is no [_]qt_plugin_instance_qgif() then delete everything in plugins\imageformats folder and mingw32-make Qt library (or just mingw32-make in [qt base]\src\plugins\imageformats)

D:\Applications\Qt\4.3.1>cd plugins
 
D:\Applications\Qt\4.3.1\plugins>cd imageformats
 
D:\Applications\Qt\4.3.1\plugins\imageformats>objdump -t libqgif4.a
In archive libqgif4.a:
 
d000003.o:     file format pe-i386
 
SYMBOL TABLE:
[  0](sec  1)(fl 0x00)(ty   0)(scl   3) (nx 0) 0x00000000 .idata$4
[  1](sec  2)(fl 0x00)(ty   0)(scl   3) (nx 0) 0x00000000 .idata$5
[  2](sec  3)(fl 0x00)(ty   0)(scl   3) (nx 0) 0x00000000 .idata$7
[  3](sec  3)(fl 0x00)(ty   0)(scl   2) (nx 0) 0x00000000 _qgif4_dll_iname
 
 
 
d000000.o:     file format pe-i386
 
SYMBOL TABLE:
[  0](sec  1)(fl 0x00)(ty   0)(scl   3) (nx 0) 0x00000000 .idata$2
[  1](sec  2)(fl 0x00)(ty   0)(scl   3) (nx 0) 0x00000000 .idata$5
[  2](sec  3)(fl 0x00)(ty   0)(scl   3) (nx 0) 0x00000000 .idata$4
[  3](sec  1)(fl 0x00)(ty   0)(scl   2) (nx 0) 0x00000000 __head_qgif4_dll
[  4](sec  0)(fl 0x00)(ty   0)(scl   2) (nx 0) 0x00000000 _qgif4_dll_iname
 
 
 
d000002.o:     file format pe-i386
 
SYMBOL TABLE:
[  0](sec  1)(fl 0x00)(ty   0)(scl   3) (nx 0) 0x00000000 .text
[  1](sec  2)(fl 0x00)(ty   0)(scl   3) (nx 0) 0x00000000 .idata$7
[  2](sec  3)(fl 0x00)(ty   0)(scl   3) (nx 0) 0x00000000 .idata$5
[  3](sec  4)(fl 0x00)(ty   0)(scl   3) (nx 0) 0x00000000 .idata$4
[  4](sec  5)(fl 0x00)(ty   0)(scl   3) (nx 0) 0x00000000 .idata$6
[  5](sec  1)(fl 0x00)(ty   0)(scl   2) (nx 0) 0x00000000 _qt_plugin_query_verif
ication_data
[  6](sec  3)(fl 0x00)(ty   0)(scl   2) (nx 0) 0x00000000 __imp__qt_plugin_query
_verification_data
[  7](sec  0)(fl 0x00)(ty   0)(scl   2) (nx 0) 0x00000000 __head_qgif4_dll
 
 
 
d000001.o:     file format pe-i386
 
SYMBOL TABLE:
[  0](sec  1)(fl 0x00)(ty   0)(scl   3) (nx 0) 0x00000000 .text
[  1](sec  2)(fl 0x00)(ty   0)(scl   3) (nx 0) 0x00000000 .idata$7
[  2](sec  3)(fl 0x00)(ty   0)(scl   3) (nx 0) 0x00000000 .idata$5
[  3](sec  4)(fl 0x00)(ty   0)(scl   3) (nx 0) 0x00000000 .idata$4
[  4](sec  5)(fl 0x00)(ty   0)(scl   3) (nx 0) 0x00000000 .idata$6
[  5](sec  1)(fl 0x00)(ty   0)(scl   2) (nx 0) 0x00000000 _qt_plugin_instance
[  6](sec  3)(fl 0x00)(ty   0)(scl   2) (nx 0) 0x00000000 __imp__qt_plugin_insta
nce
[  7](sec  0)(fl 0x00)(ty   0)(scl   2) (nx 0) 0x00000000 __head_qgif4_dll
 
 
 
D:\Applications\Qt\4.3.1\plugins\imageformats>

D:\Applications\Qt\4.3.1>cd plugins

D:\Applications\Qt\4.3.1\plugins>cd imageformats

D:\Applications\Qt\4.3.1\plugins\imageformats>objdump -t libqgif4.a
In archive libqgif4.a:

d000003.o:     file format pe-i386

SYMBOL TABLE:
[  0](sec  1)(fl 0x00)(ty   0)(scl   3) (nx 0) 0x00000000 .idata$4
[  1](sec  2)(fl 0x00)(ty   0)(scl   3) (nx 0) 0x00000000 .idata$5
[  2](sec  3)(fl 0x00)(ty   0)(scl   3) (nx 0) 0x00000000 .idata$7
[  3](sec  3)(fl 0x00)(ty   0)(scl   2) (nx 0) 0x00000000 _qgif4_dll_iname



d000000.o:     file format pe-i386

SYMBOL TABLE:
[  0](sec  1)(fl 0x00)(ty   0)(scl   3) (nx 0) 0x00000000 .idata$2
[  1](sec  2)(fl 0x00)(ty   0)(scl   3) (nx 0) 0x00000000 .idata$5
[  2](sec  3)(fl 0x00)(ty   0)(scl   3) (nx 0) 0x00000000 .idata$4
[  3](sec  1)(fl 0x00)(ty   0)(scl   2) (nx 0) 0x00000000 __head_qgif4_dll
[  4](sec  0)(fl 0x00)(ty   0)(scl   2) (nx 0) 0x00000000 _qgif4_dll_iname



d000002.o:     file format pe-i386

SYMBOL TABLE:
[  0](sec  1)(fl 0x00)(ty   0)(scl   3) (nx 0) 0x00000000 .text
[  1](sec  2)(fl 0x00)(ty   0)(scl   3) (nx 0) 0x00000000 .idata$7
[  2](sec  3)(fl 0x00)(ty   0)(scl   3) (nx 0) 0x00000000 .idata$5
[  3](sec  4)(fl 0x00)(ty   0)(scl   3) (nx 0) 0x00000000 .idata$4
[  4](sec  5)(fl 0x00)(ty   0)(scl   3) (nx 0) 0x00000000 .idata$6
[  5](sec  1)(fl 0x00)(ty   0)(scl   2) (nx 0) 0x00000000 _qt_plugin_query_verif
ication_data
[  6](sec  3)(fl 0x00)(ty   0)(scl   2) (nx 0) 0x00000000 __imp__qt_plugin_query
_verification_data
[  7](sec  0)(fl 0x00)(ty   0)(scl   2) (nx 0) 0x00000000 __head_qgif4_dll



d000001.o:     file format pe-i386

SYMBOL TABLE:
[  0](sec  1)(fl 0x00)(ty   0)(scl   3) (nx 0) 0x00000000 .text
[  1](sec  2)(fl 0x00)(ty   0)(scl   3) (nx 0) 0x00000000 .idata$7
[  2](sec  3)(fl 0x00)(ty   0)(scl   3) (nx 0) 0x00000000 .idata$5
[  3](sec  4)(fl 0x00)(ty   0)(scl   3) (nx 0) 0x00000000 .idata$4
[  4](sec  5)(fl 0x00)(ty   0)(scl   3) (nx 0) 0x00000000 .idata$6
[  5](sec  1)(fl 0x00)(ty   0)(scl   2) (nx 0) 0x00000000 _qt_plugin_instance
[  6](sec  3)(fl 0x00)(ty   0)(scl   2) (nx 0) 0x00000000 __imp__qt_plugin_insta
nce
[  7](sec  0)(fl 0x00)(ty   0)(scl   2) (nx 0) 0x00000000 __head_qgif4_dll



D:\Applications\Qt\4.3.1\plugins\imageformats>

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Oki, I deleted the contents of Qt4.3.1/plugins/imageformats (lots of .a and .dll files).

Next I made what he told me to do :
cd src
cd plugins
cd imagefomats
make

And now all works well.
My Qt4.3.1/plugins/imageformats dir contains 5 files :
- libqgif.a
- libqjpeg.a
- libqmng.a
- libqsvg.a
- libqtiff.a

When I build my application, I've no errors and I works perfectly
Thanks a lot !