I have a service that converts images stored on a website to byte array
HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create("URLTOIMAGE");
myRequest.Method = "GET";
HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();
Bitmap bmp = new Bitmap(myResponse.GetResponseStream());
myResponse.Close();
ms = new MemoryStream();
bmp.Save(ms, ImageFormat.Bmp);
This code returns a byte array that I store in a database (SQL Azure). In my Windows Phone application, I try to convert this byte array to display it on my page.
public class BytesToImageConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
BitmapImage empImage = new BitmapImage();
empImage.SetSource(new MemoryStream((Byte[])value));
return empImage;
}
public object ConvertBack(object value, Type targetType, object parameter,
System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
}
The byte array is well received by the application, but an exception is thrown when I try to do a SetSource.
empImage.SetSource(new MemoryStream((Byte[])value));
=> "Exception was unhandled", The request is not supported
Can you help me? Thx
This code works :
public class BytesToImageConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
MemoryStream stream = new MemoryStream((Byte[])value);
WriteableBitmap bmp = new WriteableBitmap(173, 173);
bmp.LoadJpeg(stream);
return bmp;
}
public object ConvertBack(object value, Type targetType, object parameter,
System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
}
Thank you everyone :)
private ImageSource GetPhoto(byte[] bytearr)
{
if (bytearr != null)
{
BitmapImage image = new BitmapImage();
InMemoryRandomAccessStream ms = new InMemoryRandomAccessStream();
ms.AsStreamForWrite().Write(bytearr, 0, bytearr.Length);
ms.Seek(0);
image.SetSource(ms);
ImageSource src = image;
return src;
}
else
return null;
}
For my UWP app i use the following IValueConverter to convert a byte array to a bindable object for an <Image Source={Binding} />
internal class ByteImageSourceConverter : IValueConverter
{
object IValueConverter.Convert(object value, Type targetType, object parameter, string language)
{
if (value == null)
return null;
return ByteToImage((byte[])value);
}
object IValueConverter.ConvertBack(object value, Type targetType, object parameter, string language)
{
throw new NotImplementedException();
}
static ImageSource ByteToImage(byte[] imageBytes)
{
BitmapImage image = new BitmapImage();
image.SetSource(imageBytes.ConvertToInMemoryRandomAcessStream());
ImageSource src = image;
return src;
}
}
internal static InMemoryRandomAccessStream ConvertToInMemoryRandomAcessStream(this byte[] arr)
{
var randomAccessStream = new InMemoryRandomAccessStream();
randomAccessStream.WriteAsync(arr.AsBuffer());
randomAccessStream.Seek(0);
return randomAccessStream;
}
Excuse me for the WriteAsync in a synchronous function. For the purpose of this post I don't have the time to solve this one, but it works this way :)
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.