Xamarin : Convert image to Pdf format in Xamarin.forms - xamarin

Question

I am getting error width cannot be null , when passing image to inputstream.As i didn't find any alterante method . Basically i want to convert image to Pdf format in Xamarin.forms which supports UWP platform .
I am using xfinium pdf library for this.
public void ConvertJpegToPdf()
{
try
{
PdfFixedDocument document = new PdfFixedDocument();
Xfinium.Pdf.PdfPage page = document.Pages.Add();
page.Width = 800;
page.Height = 600;
var imageStream = GetStream();
PdfJpegImage jpeg = new PdfJpegImage(imageStream);//<-Error
PdfStandardFont helvetica = new PdfStandardFont(PdfStandardFontFace.Helvetica, 24);
PdfBrush brush = new PdfBrush(PdfRgbColor.Red);
page.Graphics.DrawImage(jpeg, 0, 0, page.Width, page.Height);
Stream pdfStream = null;
document.Save(pdfStream);
}
catch (Exception ex)
{
throw ex;
}
}
protected Stream GetStream()
{
byte[] byteArray = Encoding.UTF8.GetBytes("http://david.qservicesit.com/images/3.jpg");
MemoryStream stream = new MemoryStream(byteArray);
return stream;
}
Please suggest some alternate to do this

Answer 1

byte[] byteArray = Encoding.UTF8.GetBytes("http://david.qservicesit.com/images/3.jpg");
You could not get image stream in this way. The method you have used can only get the Bytes of string. For your scenario, you could use http client to acquire image stream. Please refer to the following code:
public async Task<Stream> GetStream()
{
HttpClient client = new HttpClient();
HttpResponseMessage res = await client.GetAsync(new Uri("http://david.qservicesit.com/images/3.jpg"));
Stream stream = await res.Content.ReadAsStreamAsync();
return stream;
}
public async Task ConvertJpegToPdf()
{
try
{
PdfFixedDocument document = new PdfFixedDocument();
Xfinium.Pdf.PdfPage page = document.Pages.Add();
page.Width = 800;
page.Height = 600;
var imageStream = await GetStream();
PdfJpegImage jpeg = new PdfJpegImage(imageStream);
PdfStandardFont helvetica = new PdfStandardFont(PdfStandardFontFace.Helvetica, 24);
PdfBrush brush = new PdfBrush(PdfRgbColor.Red);
page.Graphics.DrawImage(jpeg, 0, 0, page.Width, page.Height);
Stream pdfStream = new MemoryStream();
document.Save(pdfStream);
}
catch (Exception ex)
{
throw ex;
}
}