qt-webengine-javascript-failed-to-load-png-image

SandyMedical

My work Environment : Qt 5.8 MSVC2015 64bit, Windows 7 64 bit, Web engine, JavaScript.

In in QT code i am loading image, converting data into QByteArray & transfering back to JavaScript. So javaScript can render image.

But Why JavaScript failed to load .png images, any clue what I am missing here ?

QT .h file code :

Q_INVOKABLE QByteArray GetTile();

QT .cpp file code :

QByteArray ExportedObject::GetTile()
{
QByteArray arr;
QFile imageFile("D:\\2.png");
arr = imageFile.readAll();
imageFile.close();
return arr;
}

JavaScript code :

var myRetValue;
window.interface.GetTile(function(returnValue) {
       myRetValue = returnValue;

        return returnValue;

});

alert(myRetValue) ///Why myRetValue always NULL ?
document.getElementById("ItemPreview").src = "data:image/png;base64," + myRetValue ; // Why it failed to load image ?