QLabel + QImage Error.

[Pada_]

Copy and paste the picture into QGraphicsView to create an RGB representation. What is the problem?

[jsulm]

@Pada_ Can you please rephrase your question? I really don't understand what you're asking...

[Pada_]

@jsulm
This does not happen on Linux, only on Windows. Use the capture tool. After capturing, ctrl + C / ctrl + V will create a RGB Sign like the picture in the lower left corner. Is there a way to get rid of it?

[jsulm]

@Pada_ said in QLabel + QImage Error.:

capture tool

what is this?
Ctrl-C/Ctrl-V where?

[Pada_]

@jsulm

I want to create an image in QGraphicsView in QGraphicsScene with the Ctrl + V image copied from the clipboard.

The capture tool is a tool provided by Windows.

It is created in the corner like a photograph.

1. Run the capture tool provided by Windows.

2. Do not save to the path, right-click, and then click Copy.
   

3. Set the image on the label. There is an RGB display in the lower left corner.
   

[jsulm]

@Pada_ I don't see how you can set image on a QLabel via copy/paste? You need to select a resource or image file.
So, how exactly do you do this "Set the image on the label"?

[Pada_]

It is set to QLabel-> setPixMap.

I'm importing QImgae from the clipboard and converting it to Pixmapd.

No, I already did it because I could do it by setting the image on the path and setting it.

However, if you save the image to the clipboard without a path and paste it, it is created without the path.

This is also created by setting the image on the label. But as I said, there is an RGB Sign in the corner. That may explain why it occurs and how to get rid of it. I'm asking that.

[jsulm]

@Pada_ said in QLabel + QImage Error.:

I'm importing QImgae from the clipboard and converting it to Pixmapd.

How?

"However, if you save the image to the clipboard without a path and paste it, it is created without the path." - paste where?
I really don't understand what you're doing. Where exactly do you do Ctrl-v?

[Pada_]

@jsulm

QGraphicsScene, as I said before.

There is an item in the sceneItem that deals with the image, but it is not the same as me.

I did not put it anywhere. Just the label of the new projet and the way I told you before, there's an RGB mark in the corner.

[mrjj]

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

[Pada_]

@mrjj

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.

1. 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.

2. Run it as my source.

3. 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

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.