How to convert EImage into QImage and show it in a QWidget?

[FloFox]

Hello everybody,

I'm working on a video acquisition project with an EURESYS frame grabber (Picolo).
I develop on Qt Creator EDI (Qt 4.8.3 based) with MS VC++ 10 compiler and I use eVision 6.7.1 library.

There is no problems with board configuration and image acquisition.
With OpenCV library, I can convert EImage to Mat and show it in a secondary window:

void MainWindow::ProcessingCallback(Channel &Ch, SignalInfo &Info)
{
    try
    {
        // Update the eVision image with the acquired image data
        UpdateImageConfig(*Info.Surf, EImgSrc);
 
        // Convert EImage to Mat
        Mat cvImg(EImgSrc.GetHeight(), EImgSrc.GetWidth(), CV_8UC3, EImgSrc.GetGenericImagePtr());
 
        // Display the new image
        imshow( "Display window", cvImg );                   
    }
    catch (Euresys::MultiCam::Exception &e)
    {
        // Display the exceptions...
    }
 
}

void MainWindow::ProcessingCallback(Channel &Ch, SignalInfo &Info)
{
    try
    {
        // Update the eVision image with the acquired image data
        UpdateImageConfig(*Info.Surf, EImgSrc);
		
        // Convert EImage to Mat
        Mat cvImg(EImgSrc.GetHeight(), EImgSrc.GetWidth(), CV_8UC3, EImgSrc.GetGenericImagePtr());

        // Display the new image
        imshow( "Display window", cvImg );                   
    }
    catch (Euresys::MultiCam::Exception &e)
    {
        // Display the exceptions...
    }

}

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So in the same way with Qt I done the next code:

void MainWindow::ProcessingCallback(Channel &Ch, SignalInfo &Info)
{
    try
    {
        // Update the eVision image with the acquired image data
        UpdateImageConfig(*Info.Surf, EImgSrc);
 
        // Convert EImage to QImage
        QImage imaq((const uchar*)EImgSrc.GetGenericImagePtr(), EImgSrc.GetWidth(), EImgSrc.GetHeight(), EImgSrc.GetBitsPerRow(), QImage::Format_RGB888);
 
        // Display the new image
        QPainter painter(this);
        painter.drawImage(QPoint(0, 0), imaq);
    }
    catch (Euresys::MultiCam::Exception &e)
    {
        // Display the exceptions...
    }
}

void MainWindow::ProcessingCallback(Channel &Ch, SignalInfo &Info)
{
    try
    {
        // Update the eVision image with the acquired image data
        UpdateImageConfig(*Info.Surf, EImgSrc);

        // Convert EImage to QImage
        QImage imaq((const uchar*)EImgSrc.GetGenericImagePtr(), EImgSrc.GetWidth(), EImgSrc.GetHeight(), EImgSrc.GetBitsPerRow(), QImage::Format_RGB888);
        
        // Display the new image
        QPainter painter(this);
        painter.drawImage(QPoint(0, 0), imaq);
    }
    catch (Euresys::MultiCam::Exception &e)
    {
        // Display the exceptions...
    }
}

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But in this case, there are no display and output show this message :

QPainter::begin: Paint device returned engine == 0, type: 1

QPainter::begin: Paint device returned engine == 0, type: 1

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Could you advice me please?