将来自 Xam.Plugin.Media 5.0.1 的图像源转换为 Xamarin Forms 中的字节数组？

Question

if (!CrossMedia.Current.IsPickPhotoSupported)
        {
            await Application.Current.MainPage.DisplayAlert("Photos Not Supported", ":( Permission not granted to photos.", "OK");
            return;
        }
        var file = await Plugin.Media.CrossMedia.Current.PickPhotoAsync(new Plugin.Media.Abstractions.PickMediaOptions
        {
            PhotoSize = Plugin.Media.Abstractions.PhotoSize.Medium,
        });


        if (file == null)
            return;

        var tmpSrc = ImageSource.FromStream(() =>
        {
            var stream = file.GetStream();
            file.Dispose();
            return stream;
        });

ImageSource toBeConverted = tmpSrc;

我希望将变量 toBeConverted 转换为 Byte[] 所以我可以将它发送到我的 webapi ...

Answer 1

ImageSource 是一种为 Xamarin.Forms.Image 提供源图像以显示某些内容的方法。如果你已经在屏幕上显示了一些东西，你的 Image 视图填充了来自其他地方的数据，例如文件或资源或存储在内存中的数组中......或者你在第一名。与其尝试从 ImageSource 取回该数据，不如保留对它的引用并根据需要上传。

所以你可以在选择照片后从文件中获取字节数组。

var file = await Plugin.Media.CrossMedia.Current.PickPhotoAsync(new Plugin.Media.Abstractions.PickMediaOptions
    {
        PhotoSize = Plugin.Media.Abstractions.PhotoSize.Medium,
    });
if (file == null)
return;    
var bytes = File.ReadAllBytes(file.Path); // you could get  the byte[] here from the file path.

Answer 2

这段代码对我也有用...

 private async void Capture()
 {
     if (!CrossMedia.Current.IsCameraAvailable || !CrossMedia.Current.IsTakePhotoSupported)
     {
         await Application.Current.MainPage.DisplayAlert("No Camera", ":( No camera available.", "OK");
         return;
     }

     var file = await CrossMedia.Current.TakePhotoAsync(new Plugin.Media.Abstractions.StoreCameraMediaOptions
     {
         Directory = "Test",
         SaveToAlbum = true,
         CompressionQuality = 75,
         CustomPhotoSize = 50,
         PhotoSize = PhotoSize.Medium,
         DefaultCamera = CameraDevice.Front
     });

     if (file == null)
         return;

     var stream = file.GetStream();
     if (stream != null)
     {
         var StreamByte = ReadAllBytes(stream);
         var NewStream = new MemoryStream(StreamByte);
         // stream = mystream;
         Device.BeginInvokeOnMainThread(() => {
             ImageSource = ImageSource.FromStream(() => NewStream);
         });

         student.ProfilePicture = StreamByte;
     }
 }
 public byte[] ReadAllBytes(Stream instream)
 {
     if (instream is MemoryStream)
         return ((MemoryStream)instream).ToArray();

     using (var memoryStream = new MemoryStream())
     {
         instream.CopyTo(memoryStream);
         return memoryStream.ToArray();
     }
 }

将来自 Xam.Plugin.Media 5.0.1 的图像源转换为 Xamarin Forms 中的字节数组？

Convert imageSource coming from Xam.Plugin.Media 5.0.1 to byte array in Xamarinforms?

c#

arrays

imagesource

xamarin.forms