Answers

• JohnMiller USForum Administrator, Xamarin Team Xamurai

  December 2016

  @CheahEngSoon,

  MediaFile has GetStream().

  You could use this to the Stream and then convert that to a byte[]. Here is one way to do that:

  public byte[] GetImageStreamAsBytes(Stream input)
      {
          var buffer = new byte[16*1024];
          using (MemoryStream ms = new MemoryStream())
          {
              int read;
              while ((read = input.Read(buffer, 0, buffer.Length)) > 0)
              {
                  ms.Write(buffer, 0, read);
              }
              return ms.ToArray();
          }
  }
  

  1
• CheahEngSoon USMember ✭✭

  December 2016

  @JohnMiller said:
  @CheahEngSoon,

  MediaFile has GetStream().

  You could use this to the Stream and then convert that to a byte[]. Here is one way to do that:

  public byte[] GetImageStreamAsBytes(Stream input)
      {
          var buffer = new byte[16*1024];
          using (MemoryStream ms = new MemoryStream())
          {
              int read;
              while ((read = input.Read(buffer, 0, buffer.Length)) > 0)
              {
                  ms.Write(buffer, 0, read);
              }
              return ms.ToArray();
          }
  }
  

  @JohnMiller How about convert the bytes array to images?

  0
• JohnMiller USForum Administrator, Xamarin Team Xamurai

  December 2016

  @CheahEngSoon,

  myImage.Source = ImageSource.FromStream(() => new MemoryStream(bytes));
  

  0
• Ivanosito COMember ✭✭

  October 2017

  Hi, I'm really new with Xamarin.Forms.
  How can I read the jpg file from a specific path I have to an image variable?
  Can it be done at the PCL Project?

  Thanks!

  0
• IonCojucovschi USMember ✭✭

  December 2017 edited January 2018

  imageBitmap = ImageHelper.GetImageBitmapFromFilePath(imageFile.Path, width, height);
  
     if (imageBitmap != null)
              {
                  PictureImageView.SetImageBitmap(imageBitmap);
                  imageBitmap = null;
                  FileimagePath = imageFile.Path;
  
              }
  
  

  it wirk for me

  0
• IonCojucovschi USMember ✭✭

  December 2017 edited January 2018

  an d image helper just copy this class to your project...

  class ImageHelper
          {
              public static Bitmap GetImageBitmapFromUrl(string url)
              {
                  Bitmap imageBitmap = null;
                  using (var webClient = new WebClient())
                  {
                      var imageBytes = webClient.DownloadData(url);
                      if (imageBytes != null && imageBytes.Length > 0)
                      {
                          imageBitmap = BitmapFactory.DecodeByteArray(imageBytes, 0, imageBytes.Length);
                      }
                  }
                  return imageBitmap;
              }
  
              public static Bitmap GetImageBitmapFromFilePath(string fileName, int width, int height)
              {
                  // first we get the the dimensions of the file on disk
                  BitmapFactory.Options options = new BitmapFactory.Options { InJustDecodeBounds = true };
                  BitmapFactory.DecodeFile(fileName, options);
  
                  // next we calculate the ratio that we need to resize the image by 
                  // in order to fit the requested dimensions
                  int outHeight = options.OutHeight;
                  int outWidth = options.OutWidth;
                  int inSampleSize = 1;
  
                  if (outHeight > height || outWidth > width)
                  {
                      inSampleSize = outWidth > outHeight
                                      ? outHeight / height
                                      : outWidth / width;
                  }
  
                  // now we will load the image and have BitmapFactory resize it for us
                  options.InSampleSize = inSampleSize;
                  options.InJustDecodeBounds = false;
                  Bitmap resizedBitmap = BitmapFactory.DecodeFile(fileName, options);
  
                  return resizedBitmap;
              }
  
  
          }
  

  0