How to display a picture

Pradeep Kumar

I put this "file:///C:/Users/David/Documents/addddd/r.jpg"

Yes i added a Qlabel with the .ui and named label (dont worry i changed the name in my code)

A small info, u can also place image in resource file of the project , so no need to worry about absolute path.

Payx

@mrjj said in How to display a picture:

@Payx

int step=4;
for (i=0,i<s.width()+1,i=i+step)
  for (j=0,j<s.height()+1,j=j+step)
  just use  QImage QImage::copy(int x, int y, int width, int height) const

This will generate small images of each 4x4

Okay i will test that.

I got an other question, with that code : "QImage img("C:/path/filename.jpg");" i have to put the destination of the file (sorry for my english)

but if i want to create a file explorer (for example in facebook we can change a picture with a file explorer and choose what picture i want)
what can i do ?

mrjj

but if i want to create a file explorer (for example in facebook we can change a picture with a file explorer and choose what picture i want)

Im not 100% sure what you ask, but I give a guess:

Instead of using a fixed path in the program you can use
http://doc.qt.io/qt-5/qfiledialog.html
to let user browser and select an image.

Like in this example
http://doc.qt.io/qt-5/qtwidgets-widgets-imageviewer-example.html

so
QImage img("C:/path/filename.jpg"
becomes

QString imagefile = QFileDialog::getOpenFileNames(this, tr("Files"), QDir::currentPath(), tr("*.jpg *.png"));
QImage img(imagefile);

Hope that is what you asked about.

Payx

I found what i sought :

QStringList fileNames = QFileDialog::getOpenFileNames(this, tr("Open Image"),"/path",tr("Image Files (*.jpg)"));

But i got all files, and i just want .jpg for now """"""tr("Image Files (*.jpg)"));"""""""""" dont work ?

then i want to put my picture file in a label, but i can't find how to convert a QStringList to a Qimage or Qpixmap

mrjj

@Payx
it should work with *.jpg.

but i can't find how to convert a QStringList to a Qimage or Qpixmap

Oh just use
fileName = QFileDialog::getOpenFileName(this,
tr("Open Image"), "/", tr("Image Files (*.png *.jpg *.bmp)"));

It only returns the 1 filename. ( NOTE THE MISSING s)

ui->mylabel->setPixmap( new QPixmap(fileName ));

Payx

I got one error : Expected one specifier before pixmap

mrjj

@Payx
the class is QPixmap
so its "new QPixmap"

~~setPixmap( new QPixmap(fileName ));~~

Sorry, was just fast code.

Payx

Yes i tried too before post but i had one error too, so i post the first error.

The second is :
No matching function for call to 'Qlabel::setPixmap(QPixmap*)"

mrjj

@Payx
Sorry not enough coffee :)

QPixmap pix(fileName );
setPixmap(pix);

Pradeep Kumar

If u are using QImage

m_imageLabel = new QLabel;
QImage imagePixmap;
imagePixmap.load(":/new/prefix1/Images/imageName.extension");
m_imageLabel->setPixmap(QPixmap::fromImage(imagePixmap));

Or

Only QPixmap

m_imageLabel = new QLabel;
QPixmap imagePixmap;
imagePixmap.load(":/new/prefix1/Images/imageName.extension");
m_imageLabel->setPixmap(imagePixmap);

imageName.extension can be image.png, image.jpeg.

Payx

@Pradeep-Kumar said in How to display a picture:

If u are using QImage

m_imageLabel = new QLabel;
QImage imagePixmap;
imagePixmap.load(":/new/prefix1/Images/imageName.extension");
m_imageLabel->setPixmap(QPixmap::fromImage(imagePixmap));

Or

Only QPixmap

m_imageLabel = new QLabel;
QPixmap imagePixmap;
imagePixmap.load(":/new/prefix1/Images/imageName.extension");
m_imageLabel->setPixmap(imagePixmap);

imageName.extension can be image.png, image.jpeg.

U didnt read the thread i think :-).
But thx

@mrjj Lol no problem :-)
Thanks it works i will create an other thread for an other question after

Pradeep Kumar

Thread says how to display a picture

@Payx
Is this the thing?.
correct me if i was wrong.

Payx

@Pradeep-Kumar said in How to display a picture:

Thread says how to display a picture

@Payx
Is this the thing?.
correct me if i was wrong.

wow u just answer the question after 5 guys answer me.

Pradeep Kumar

Hmmmmmmmmmm was toooooooooooo late.:)))

Pradeep Kumar

Thanks it works i will create an other thread for an other question after

If it is working can u mark thread has solved, so it will be useful in future.
Cheers.:)))))))

Thanks,

Payx

How can i do that ?

Pradeep Kumar

u have already marked as solved for this thread.

Pradeep Kumar

Anyways in the right bottom of the topic u will see topic button and u see mark as solved under the topic button, click on it.

:)

Thanks.

spice

The link address has expired
Please pay attention to select the example corresponding to your current qt version in the upper right corner
https://code.qt.io/cgit/qt/qtbase.git/tree/examples/widgets/widgets/imageviewer?h=5.15

Milad 24

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