[Interest] Accessing Qbytearray of C++ in QML

[Nilesh Kokane]

Hi Alejandro,

Thanks for your suggestion. I made it all working with the string.

On Fri, Nov 21, 2014 at 3:54 PM, Alejandro Exojo <suy at badopi.org> wrote:

> El Friday 21 November 2014, Nilesh Kokane escribió:
> > Hi,
> >
> >  I'm accessing the Qbytearray from c++ in the qml code and assigning it
> to
> > a property real ,but getting error while run as *qrc:///main.qml:65:
> Error:
> > Cannot assign [undefined] to double*.
>
> A "real" in QML is a double in C++. How do you expect a QByteArray to be
> converted to a real? There is a QByteArray::toFloat, but that's "interpret
> the
> byte array as text, and parse it as a float". If you are reading binary
> data
> that is not going to work.
>
> The closest representation of the original QByteArray would be a string,
> since
> can be seen as a string of bytes, and IIRC, you can use whatever byte
> value in
> a JavaScript string.
>
> $ node
> > byteArray = '\x02hi!\x03\x00'
> '\u0002hi!\u0003\u0000'
> > byteArray.length
> 6
> > for (var i=0; i < byteArray.length; i++) {
> ... console.log(byteArray.charCodeAt(i));
> ... }
> 2
> 104
> 105
> 33
> 3
> 0
>
> >  I've registered the c++ class in the main by
> > qmlRegisterType<MainWindow>("serial", 1, 0, "serialdata"); and imported
> the
> > serial 1.0 in the qml file. Am i wrong somewhere.
>
> You've got an error on the QML file, line 65. This line of the C++ side is
> not
> very useful.
>
> --
> Alex (a.k.a. suy) | GPG ID 0x0B8B0BC2
> http://barnacity.net/ | http://disperso.net
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>



-- 
Nilesh
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