Base64 QString to QImage to QString in Qt5

I have tested it on Qt5.10 and it works well.

Encode -

QStringToQImage(const QString msg)

{

    QByteArray by = QByteArray::fromBase64(msg.toLatin1());

    QImage img = QImage::fromData(by,"JPEG");

    return img;

}

Decode -

QImageToQString(const QImage &image)

{

    QByteArray byteArray;

    QBuffer buffer(&byteArray);

    image.save(&buffer, "JPEG"); // writes the image in JPEG format inside the buffer

    QString iconBase64 = QString::fromLatin1(byteArray.toBase64().data());

    return iconBase64;

}

Base64 encode/decode in MATLAB

The method I have written below converts an image in JPG format to base64.

To encode an image, Download the code from https://www.mathworks.com/matlabcentral/fileexchange/24514-base64-image-encoder

and use it like this - 

imname = imread('pic.jpg');

base64str = base64file(imname);

To decode an image, I could not find a more direct solution in MATLAB than to write it as a JPG file and then read it back.

raw = base64decode(xmlImageBytes);   % convert xml image to raw binary
fid = fopen('decodedImage.jpg', 'wb');
fwrite(fid, raw, 'uint8');            % dump the raw binary to the hard disk
fclose(fid);
img = imread('decodedImage.jpg');

This method does not remove/convert escape characters correctly sometimes, thus decoded image is not correct. Additional code has to be written to convert escape characters before decoding the XML image bytes.