topic Re: convert image or imageobject to binary in qml in Qt Maps SDK Questions

convert image or imageobject to binary in qml

rsharma — Wed, 16 Dec 2020 11:14:32 GMT

Hi,

I want to convert image object url image to binary, but unable to do so, as further i have to conver it to base64.

I am not getting help from anywhere, i tried alot, thanks in advance.

i m trying like this

                var buffer_data = imageObject.toArrayBuffer();

but when i convert it into base64 it do not convert properly

with the fnc below. but if any string i want to convert, it converts properly

function arrayBufferToBase64( buffer ) {

    var binary = '';

    var bytes = new Uint8Array( buffer );

    var len = bytes.byteLength;

    for (var i = 0; i < len; i++) {

        binary += String.fromCharCode( bytes[ i ] );

    return Qt.btoa( binary );

Please help. i am stuck in it from last 3weeks

Re: convert image or imageobject to binary in qml

JamesBallard1 — Wed, 16 Dec 2020 19:45:02 GMT

Hi @rsharma ,

Is there any ArcGIS Runtime workflow you're trying to achieve with this? If not it's a bit off topic and more related to QML general programming.

Generally speaking, whenever we've had to do image processing we use the QQuickImageProvider pattern, which does require a bit of C++ logic. I don't know if this directly applies to your use case, but I hope it is helpful.

https://github.com/Esri/arcgis-runtime-samples-qt/blob/master/ArcGISRuntimeSDKQt_CppSamples/Maps/TakeScreenshot/MapImageProvider.h

https://doc.qt.io/qt-5/qtquick-imageprovider-example.html

https://doc.qt.io/qt-5/qquickimageprovider.html

Re: convert image or imageobject to binary in qml

rsharma — Mon, 21 Dec 2020 04:18:17 GMT

please have the solution of my problem

var s =imageObject.toArrayBuffer('jpeg') ; var b = AppFramework.binaryData(s); // produces a binary data object console.log(b.base64); imageObject.loadFromData(b.base64);