Load an image in QLabel

[zeeb100]

why if i execute:

QImage image(imgPath);
label->setPixmap(QPixmap::fromImage(image));

QImage image(imgPath);
label->setPixmap(QPixmap::fromImage(image));

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don't show image

qt is install on linux in static mode whitout demo and example...

[mazurekwrc]

I think that you are doing something wrong when you create object QImage, use this code and see what load function return

QImage image;
bool result = image.load( imgPath );

QImage image;
bool result = image.load( imgPath );

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[wysota]

I would say you are using a relative path to the image and QImage simply can't find it.

[zeeb100]

the imgPath is

/Users/user/Desktop/img.jpg

is absolute path not relative

when i do

QImage image;
bool result = image.load( imgPath );
cout <<"result ="<<result;

QImage image;
bool result = image.load( imgPath );
cout <<"result ="<<result;

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result =0.

[Lykurg]

Is the image readable to your application? Try using QFile and get the attributes of the image file. And sorry, but check via

qWarning() << QFile::exists(imgPath);

qWarning() << QFile::exists(imgPath);

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[zeeb100]

qWarning return true...

[Lykurg]

Ok, what't the output of

QFileInfo fi(imgPath);
qWarning() << fi.permissions();

QFileInfo fi(imgPath);
qWarning() << fi.permissions();

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and maybe the jpg is defect, that you may open it with gimp etc. but qt fails. So for debug open the file and save it as png and try to load this in Qt.

[zeeb100]

jpg are correct and qWarning output is

30583

[Lykurg]

Sorry if I bother you, but then it must be in your code. Last debug question (with your image):

#include <QtGui>
 
int main(int argc, char **argv)
{
  QApplication app(argc, argv);
 
  QImage image;
  bool result = image.load( "/qt/qtsdk-2009.01/qt/src/3rdparty/libtiff/html/images/smallliz.jpg" );
  qWarning() << result;
 
  QLabel lab;
  lab.setPixmap(QPixmap::fromImage(image));
  lab.show();
 
  return app.exec();
}

#include <QtGui>

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

  QImage image;
  bool result = image.load( "/qt/qtsdk-2009.01/qt/src/3rdparty/libtiff/html/images/smallliz.jpg" );
  qWarning() << result;
    
  QLabel lab;
  lab.setPixmap(QPixmap::fromImage(image));
  lab.show();

  return app.exec();
}

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don't work? Here on my linux machine it works as expected.

[zeeb100]

ok thanks the problem was installation of qt... the static mode don't load jpg becouse it find pluging thanks for help