如何将图像从图库上传到Windows Phone 8.1中的服务器…？

Question

如何将图像从画廊上传到服务器？

我正在使用FileOpenPicker来选择屏幕上的图像显示BitmapImage显示。 在将图像上传到服务器的同时，这可以正常工作。 我正在使用此代码使用FileOpenPicker将图像选择为图库。

 private async void MenuFlyoutItem_Click(object sender, RoutedEventArgs e)
        {
            ImagePath = string.Empty;
            FileOpenPicker filePicker = new FileOpenPicker();
            filePicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
            filePicker.ViewMode = PickerViewMode.Thumbnail;

            // Filter to include a sample subset of file types
            filePicker.FileTypeFilter.Clear();
            filePicker.FileTypeFilter.Add(".bmp");
            filePicker.FileTypeFilter.Add(".png");
            filePicker.FileTypeFilter.Add(".jpeg");
            filePicker.FileTypeFilter.Add(".jpg");

            filePicker.PickSingleFileAndContinue();
            view.Activated += viewActivatedddd;

        }



private async void viewActivatedddd(CoreApplicationView sender, IActivatedEventArgs args1)
        {
            FileOpenPickerContinuationEventArgs args = args1 as FileOpenPickerContinuationEventArgs;

            if (args != null)
            {
                if (args.Files.Count == 0) return;

                view.Activated -= viewActivatedddd;
                StorageFile storageFile = args.Files[0];
                var imageFile = args.Files[0] as StorageFile;

                var stream = await storageFile.OpenAsync(Windows.Storage.FileAccessMode.Read);
                var bitmapImage = new Windows.UI.Xaml.Media.Imaging.BitmapImage();
                await bitmapImage.SetSourceAsync(stream);

                var decoder = await Windows.Graphics.Imaging.BitmapDecoder.CreateAsync(stream);
                displayImage.Source = bitmapImage;
                btnclose.Visibility = Visibility.Visible;



            }
        }`

Answer 1

这是利用WebAPI时遇到此问题的解决方案。

将图像转换为内存流。

客户：

 public async Task UploadImage(byte[] image, string url)
        {
            Stream stream = new System.IO.MemoryStream(image);
            HttpStreamContent streamContent = new HttpStreamContent(stream.AsInputStream());

            Uri resourceAddress = null;
            Uri.TryCreate(url.Trim(), UriKind.Absolute, out resourceAddress);
            Windows.Web.Http.HttpRequestMessage request = new Windows.Web.Http.HttpRequestMessage(Windows.Web.Http.HttpMethod.Post, resourceAddress);
            request.Content = streamContent;

            var httpClient = new Windows.Web.Http.HttpClient();
            var cts = new CancellationTokenSource();
            Windows.Web.Http.HttpResponseMessage response = await httpClient.SendRequestAsync(request).AsTask(cts.Token);
        }

控制器：

public async Task<HttpResponseMessage> Post()
{
    Stream requestStream = await this.Request.Content.ReadAsStreamAsync();
    byte[] byteArray = null;
    using (MemoryStream ms = new MemoryStream())
    {
        await requestStream.CopyToAsync(ms);
        byteArray = ms.ToArray();
    }
    .
    .
    .
    return Request.CreateResponse(HttpStatusCode.OK);
}