QLabel + QImage Error.

mrjj

Hi
Im not sure what tool that is. ?
Seems not to be installed in my windows.

Pada_

use this tool.

mrjj

Ok.
But i cant get to it to paste anything to a QGraphicsView .
Nothing happens.
Did you write some code to allow this ?

Pada_

@mrjj

QGraphicsView I'm working on it, so you can do it with Ctrl + V.

In addition to QGraphicsView, the result is the same even if you create a new project and set the Image stored in the Clipboard in the QLabel.

Capture the image with the capture tool and do not save it. Then click the right mouse button and click Copy. It will then enter the Clipboard.
Run it as my source.
Looking at the left corner or the corners of the image, you will see the RGB dots.

QClipboard *clipboard = QApplication::clipboard();
if(!clipboard)
return;

test source !

#include "mainwindow.h"
#include "ui_mainwindow.h"

#include <QBuffer>
#include <QClipboard>
#include <QMimeData>

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);

QClipboard *clipboard = QApplication::clipboard();
if(!clipboard)
    return;

const QMimeData *mimeData = clipboard->mimeData();
if(!mimeData)
    return;

if(mimeData->hasImage())
{
    QImage image = qvariant_cast<QImage> (mimeData->imageData());
    ui->label->setPixmap(QPixmap::fromImage(image));
}

}

MainWindow::~MainWindow()
{
delete ui;
}

mrjj

Hi
Using your code and paste to QLabel did not show RGB dots
alt text

What Qt version are you using ?

Pada_

@mrjj

I am using Qt5.4 version and Windows8 64Bit.

The same phenomenon came out on Windows10 64Bit.

I did it with the same source, but did not come out with RGB dots like the picture?

Can I check the source?

mrjj

@Pada_
Which source ?
I used your QClipboard *clipboard = QApplication::clipboard(); code and a blank project with QLabel.

Pada_

@mrjj

I also tested it with the source I wrote.

But it looks like a picture. I do not know where the problem is.

mrjj

@Pada_
Are you saying the code you show here and QLablel works but
in real program it don't with QGraphicsView ?

Would it be possible to test with a newer Qt version ?
5.4 is pretty old.

Pada_

@mrjj

5.4 or later Qt can not be installed and used for convenience.

Have you tried mrjj in 5.4?

mrjj

@Pada_
nope. i dont have 5.4.