.h

#ifndef MYIMAGEPROVIDER_H
#define MYIMAGEPROVIDER_H

#include <QQuickImageProvider>
#include <QQuickWindow>
#include <QImage>

class MyImageProvider : public QQuickImageProvider
{
public:
    explicit MyImageProvider(QQuickWindow *window = 0);

    QImage requestImage(const QString &id, QSize *size, const
 
 QSize &requestedSize)；

signals:

public slots:

private:
    QQuickWindow   *m_window;
};

#endif // MYIMAGEPROVIDER_H

.cpp

#include "myimageprovider.h"

MyImageProvider::MyImageProvider(QQuickWindow *window)
    : QQuickImageProvider(QQuickImageProvider::Image)
{
    m_window = window;
}


QImage MyImageProvider::requestImage
 
(const QString &id, QSize *size, const QSize &requestedSize)
{
    if(m_window == NULL)
    {
        return QImage();
    }
    QImage image = m_window->grabWindow();  //截圖全屏
    if(requestedSize.isValid())
    {
        return image.scaled(requestedSize);
    }
    return image;
}

main.cpp中新增如下程式碼：

QQuickView *viewer；
int main()
{
    ....
    viewer = new QQuickView();
    viewer->engine()->addImageProvider("windowScreen",new myImageProvider(viewer));  //設定圖片的位置
}

.qml

I
mage{
    source:"image://windowScreen/screenImage";
    }

requestImage()生成圖片，可在C++中使用或者qml中使用，
QImage image = m_window->grabWindow(); //截圖全屏
同樣的也可以擷取部分圖片