Copying image to clipboard fails

aran

Hi everybody,
For my application, I try to copy an image to the clipboard. The image is loaded successfully to the QImage, but calling setImage() on the clipboard does simply nothing. Here is a simple compileable example, and you can get a tar containing all of these files here. Does anybody know what I am doing wrong?

// clipboard.pro

QT += core gui widgets

TARGET = Clipboard
TEMPLATE = app

SOURCES += main.cpp\
        mainwindow.cpp

HEADERS  += mainwindow.h

RESOURCES += image.qrc

// main.cpp

#include "mainwindow.h"
#include <QApplication>

int main(int argc, char *argv[]) {

    QApplication a(argc, argv);
    MainWindow w;
    w.show();

    return a.exec();
}

// mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QHBoxLayout>
#include <QPushButton>
#include <QApplication>
#include <QClipboard>

class MainWindow : public QMainWindow {

    Q_OBJECT

public:
    MainWindow(QWidget *parent = 0);
    ~MainWindow();

private slots:
    void copy();
};

#endif // MAINWINDOW_H

// mainwindow.cpp

#include "mainwindow.h"

MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) {

    QWidget *center = new QWidget;
    this->setCentralWidget(center);
    QHBoxLayout *lay = new QHBoxLayout;
    center->setLayout(lay);
    QPushButton *but = new QPushButton("Copy");
    lay->addWidget(but);
    connect(but, &QPushButton::clicked, this, &MainWindow::copy);

}

void MainWindow::copy() {

    QImage img("image.jpg");

    QApplication::clipboard()->setImage(img, QClipboard::Clipboard);
    QApplication::clipboard()->setImage(img, QClipboard::Selection);

}

MainWindow::~MainWindow() { }

image.jpg

SGaist

Hi,

What version of Qt are you using ? On what platform ?

aran

I'm using Qt 5.8.0, running Arch Linux 64Bit

kenchan

From the QClipboard docs, why not try this...
QMimeData *data = new QMimeData;
data->setImageData(image);
clipboard->setMimeData(data, mode);

or use a clipboard->setPixmap(...) make the pixmap from your image. Pixmaps always work like this for me.

aran

Using QPixmap strangely worked... Thanks!

SGaist

Using the same code ?