[Qt-interest] QImage fail to load jpg file after linking with qt in static lib way.

[Malyushytsky, Alex]

Using static QT has its own restrictions , disadvantages and require code modification to support some features.
Look in the documentation for Static Plugins

"Plugins can be linked statically against your application. If you build the static version of Qt, this is the only option for including Qt's predefined plugins.


To link statically against those plugins, you need to use the Q_IMPORT_PLUGIN<qtplugin.html#Q_IMPORT_PLUGIN>() macro in your application and you need to add the required plugins to your build using QTPLUGIN. For example, in your main.cpp:

 #include <QApplication>

 #include <QtPlugin>

 Q_IMPORT_PLUGIN(qjpeg)

 Q_IMPORT_PLUGIN(qgif)

 Q_IMPORT_PLUGIN(qkrcodecs)

 int main(int argc, char *argv[])

 {

     QApplication app(argc, argv);

     ...

     return app.exec();

 }

In the .pro file for your application, you need the following entry:

 QTPLUGIN     += qjpeg \

                 qgif \
                 qkrcodecs"

Alex

________________________________
From: qt-interest-bounces at trolltech.com [mailto:qt-interest-bounces at trolltech.com] On Behalf Of James Yan
Sent: Friday, December 19, 2008 3:52 AM
To: qt-interest at trolltech.com
Subject: [Qt-interest] QImage fail to load jpg file after linking with qt in static lib way.

hey all,

i'm using qt at win32/msvc2005 express, my source code using QImage:

QImage img;
if(!img.load("c:/test.jpg"))
{
   printf("fail to load jpg file.\n");
}
else
{
   printf("success to load jpg file.\n");
}

the source code works well UNTIL i link my app with qt in statilc lib way, the result always be :    printf("fail to load jpg file.\n");
after debug in i found it fail at those qt code lines:

bool QImageReader::read(QImage *image)
...
    if (!d->handler && !d->initHandler())  // return false with this "if"
        return false;
...

any suggestion for me? thanks.


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