Could not download PDF from base 64 data from web service . Why?

Ionic Framework ionic-v3
7

Hi Sathasivam,

I changed my code some bit as follows

getOwnershipCertificate(lb, bid, reason) {
    this.certificateProvider.getOwnershipCertificate(lb, bid, reason)
    .then(data => {
        let downloadPDF: any = data[0].ownershippdf;
        let base64pdf = downloadPDF;
        var binary = atob(base64pdf.replace(/\s/g, ''));
        var len = binary.length;
        var buffer = new ArrayBuffer(len);
        var view = new Uint8Array(buffer);
        for (var i = 0; i < len; i++) {
            view[i] = binary.charCodeAt(i);
        }
           
        var blobPdf = new Blob( [view], { type: "application/pdf" });
        this.file.writeFile(this.file.externalRootDirectory, 'OwnershipCertificate.pdf', blobPdf, { replace: true })
     .then(res => {
           console.log('wres', res);
         this.fileOpener.open(res.toInternalURL(), 'application/pdf').then((ores) => {
               console.log('ores', ores)
         }).catch(err => {
             console.log('open error');
         });
     }).catch(err => {
         console.log('save error');
     });
    }).catch(err => {
        console.error('ownership get error',err);
    });
 }

It work fine in Kitkat(4.4) and lolipop(5.1) . But not in Nougat and Marshmallow…

Please advise …

N.B https://app.box.com/s/r97ue9woi4ehg7d99ofmkswo2ye8tbep

In this app , there is an option to Ownership Certificate

Give Wardno and Door no as 1

in second form select Purpose as Bank

Tell is PDF downloaded … Waiting reply

Thanks

Anes