This fantastic Flip Image Plugin lets me design the back of my photo to complement the text I put there. It offers a great choice of colors and fonts. Way to go Flip Image!

http://wordpress.org/extend/plugins/wp-flip-image-free

Thanks.

Sorry to "up" this old thread...

Steve, did you solve your problem?
I have the same message with my custom image plugin. the only thing I had found is that there is some mismatch with Qt versions (4.7.4 and 4.8.0 installed...). And my plugin is nether recognised (QImageReader::supportedImageFormats does not return my image format).

Regards,
Nmut.

My plugin is not yet ready to be published, so I cannot offer something to test and compare for you.

@ obj->moveToThread(QCoreApplicationPrivate::mainThread());@

Which, in turn is called by line 292 in qimagereader.cpp:

@ QImageIOPlugin *plugin = qobject_cast<QImageIOPlugin *>(l->instance(QString::fromLatin1(suffix)));
@

It's trying to get a plugin pointer for my DLL class so it can call the 'create' method. The thread error causes the above line to return zero for 'plugin', and hence, none of my other plugin classes gets called.

@#include "qimsktest.h"

#include "qfileinfo.h"

#include "qpluginloader.h"
#include "qlibrary.h"
#include "qimageiohandler.h"

QIMskTest::QIMskTest(QWidget *parent, Qt::WFlags flags)
: QMainWindow(parent, flags)
{
ui.setupUi(this);

QString mskFp("...0012.msk");

QImage* mskImg = new QImage(mskFp);

QPixmap mskPmp = QPixmap::fromImage(*mskImg);

ui.mskImg->setPixmap(sMskPmp);
}

QIMskTest::~QIMskTest()
{

}
@

As a first step: Cut down your application to just the imageformat plugin and a very, very simple test application. No threads, no fancy GUI. Just a dialog containing a label and three lines to set an image on the label - setPixmap(QPixmap::fromImage(xxx)). Nothing more.

If that works, move on to a bigger project. If not, feel free to come back here, of course :)

QObject::moveToThread: Current thread (0x1f2a7b0) is not the object's thread (0x398450).
Cannot move to target thread (0x1f2a7b0)

Although, I cant, for the life of me, see how it relates.

Do you get any output on the console? Some warnings, etc.?

@class QICOPlugin : public QImageIOPlugin
{
public:
QStringList keys() const;
Capabilities capabilities(QIODevice *device, const QByteArray &format) const;
QImageIOHandler *create(QIODevice *device, const QByteArray &format = QByteArray()) const;
};
@

@
QT_BEGIN_NAMESPACE

class MskPlugin : public QImageIOPlugin
{
Q_OBJECT
public:
QStringList keys() const;
@

@#ifndef MSKPLUGIN_H
#define MSKPLUGIN_H

#include "mskplugin_global.h"
#include "MskHandler.h"

#include <qstringlist.h>
#include <QImageIOPlugin>
//#include <QtPlugin>

QT_BEGIN_NAMESPACE

class MskPlugin : public QImageIOPlugin
{
public:
QStringList keys() const;
Capabilities capabilities(QIODevice *device, const QByteArray &format) const;
QImageIOHandler *create(QIODevice *device, const QByteArray &format = QByteArray()) const;

private:

};

#endif // MSKPLUGIN_H
@

and the .cpp:

@#include "mskplugin.h"

QStringList MskPlugin::keys() const
{
return QStringList() << QLatin1String("msk");
}

QImageIOPlugin::Capabilities MskPlugin::capabilities(
QIODevice *device, const QByteArray &format) const
{
if (format == "msk")
return Capabilities(CanRead);
//return Capabilities(CanRead | CanWrite); Writing currently disabled.

if (!(format.isEmpty() && device->isOpen()))
    return 0;

Capabilities cap;

if (device->isReadable() && device->peek(4) == "MSK2")
cap |= CanRead;

/* Currently, disable writing.
if (device->isWritable())
cap |= CanWrite;
*/

return cap;

}

QImageIOHandler *MskPlugin::create(QIODevice *device, const QByteArray &format) const
{
QImageIOHandler *handler = new MskHandler;
handler->setDevice(device);
handler->setFormat(format);
return handler;
}

Q_EXPORT_PLUGIN2(mskPlugin, MskPlugin)

QT_END_NAMESPACE
@

If qmetaobject.cpp contained an error, I would suspect it to have popped up long before.