public async Task UploadFile(Windows.Storage.StorageFile file)
{
var fileName = file.Name;
using (Windows.Storage.Streams.IRandomAccessStreamWithContentType stream = await file.OpenReadAsync())
await deviceClient.UploadToBlobAsync(fileName, stream.AsStream());
}
protected async static Task <Windows.Storage.Streams.IRandomAccessStreamWithContentType> GetFileReaderStreamAsync(Windows.Storage.StorageFile fle)
{
Windows.Storage.Streams.IRandomAccessStreamWithContentType strm = null;
strm = await fle.OpenReadAsync();
return(strm);
}
public void ShowPage()
{//To render PDF page, finally to the image control.
//Calculate render size.
CalcRenderSize();
PixelSource bitmap = new PixelSource();
bitmap.Width = (int)m_iRenderAreaSizeX;
bitmap.Height = (int)m_iRenderAreaSizeY;
Windows.Storage.Streams.IRandomAccessStreamWithContentType stream = m_SDKDocument.RenderPageAsync(bitmap, m_iStartX, m_iStartY, m_iRenderAreaSizeX, m_iRenderAreaSizeY, m_iRotation).GetResults();
if (stream == null)
{
//ShowErrorLog("Error: Fail to render page.", ref new UICommandInvokedHandler(this, &demo_view::renderPage::ReturnCommandInvokedHandler),true, FSCRT_ERRCODE_ERROR);
return;
}
Windows.UI.Xaml.Media.Imaging.BitmapImage bmpImage = new Windows.UI.Xaml.Media.Imaging.BitmapImage();
bmpImage.SetSource(stream);
image.Width = (int)m_iRenderAreaSizeX;
image.Height = (int)m_iRenderAreaSizeY;
image.Source = bmpImage;
}
/*
* public override Stream GetWriterStream( string path )
* {
* return null;
*
* /*
* byte[] data = Encoding.Unicode.GetBytes(content);
*
* var folder = ApplicationData.Current.LocalFolder;
* var file = await folder.CreateFileAsync(fileName, CreationCollisionOption.ReplaceExisting);
*
* using (var s = await file.OpenStreamForWriteAsync())
* {
* await s.WriteAsync(data, 0, data.Length);
* }
*
* }
*/
public override System.IO.Stream GetReaderStream(string path, bool bForPreview)
{
//FAILS...
/*
* if( bForPreview )
* {
* MessageBox.Show( path );
*
* StorageFile fle = GetFileObject( path );
* if( fle == null )
* {
* MessageBox.Show( "fle is null" );
* return null;
* }
*
* StorageItemThumbnail tn = null;
*
* //protected async static Task<StorageItemThumbnail> GetFileThumbnailAsync( StorageFile fle )
*
* MessageBox.Show( "Before call." );
*
* var taskHlp1 = Task.Run(async () => { tn = await GetFileThumbnailAsync(fle); });
* taskHlp1.Wait();
*
* if( tn == null )
* {
* MessageBox.Show( "tn is null" );
* return null;
* }
*
* MessageBox.Show( "Before AsStream." );
*
* Stream strm = tn.AsStream();
* if( strm == null )
* {
* MessageBox.Show( "strm is null" );
* return null;
* }
*
* MessageBox.Show( "Stream length: " + strm.Length.ToString() );
*
* return strm;
*
* /*
* InMemoryRandomAccessStream win8Stream = GetData(); // Get a data stream from somewhere.
* System.IO.Stream inputStream = win8Stream.AsStream()
*
* For converting from .NET streams -> WinRT streams:
*
* Windows.Storage.Streams.IInputStream inStream = stream.AsInputStream();
* Windows.Storage.Streams.IOutputStream outStream = stream.AsOutputStream();
*
* //
* // //
* //
* StorageFile storageFile =
* await Windows.Storage.StorageFile.GetFileFromApplicationUriAsync(uri);
*
* var randomAccessStream = await storageFile.OpenReadAsync();
* Stream stream = randomAccessStream.AsStreamForRead();
*
*
* //return tn.AsStream();
* //return tn.GetInputStreamAt( 0 ).AsStreamForRead();
* }
* else
*/
{
//WORKS FINE!!!
/*
* int iPos = path.LastIndexOf( '\\' );
* if( iPos < 0 )
* return null;
*
* StorageFolder fldr = GetFolderObject( path.Substring( 0, iPos ) );
* if( fldr == null )
* return null;
*
* Stream strm = null;
*
* var taskHlp1 = Task.Run(async () => { strm = await GetFileReaderStreamAsync(fldr, path.Substring( iPos + 1 )); });
* taskHlp1.Wait();
*
* return strm;
*/
Windows.Storage.StorageFile fle = GetFileObject(path);
if (fle == null)
{
MessageBox.Show("fle is null");
return(null);
}
Windows.Storage.Streams.IRandomAccessStreamWithContentType strm = null;
var taskHlp1 = Task.Run(async() => { strm = await GetFileReaderStreamAsync(fle); });
taskHlp1.Wait();
if (strm == null)
{
return(null);
}
return(strm.AsStreamForRead());
}
}
public async void Run(IBackgroundTaskInstance taskInstance)
{
var deferral = taskInstance.GetDeferral();
try
{
Task.Run(async() =>
{
string myConnectionDevice = "HostName=gabp2017.azure-devices.net;DeviceId=TestDevice;SharedAccessKey=3bG0qc+rxpaIyNT8ckCzM1BWJFRav+29mfGimdM7kig=";
DeviceClient deviceClient = DeviceClient.CreateFromConnectionString(myConnectionDevice);
StorageFile file = await StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///Images/GAB.png"));
var fileName = file.Name;
using (Windows.Storage.Streams.IRandomAccessStreamWithContentType stream = await file.OpenReadAsync())
await deviceClient.UploadToBlobAsync(fileName, stream.AsStream());
}).Wait();
}
catch (Exception ex)
{
var a = ex;
}
}
private async void BackgroundInit()
{
// 这是之所以这么纠结，只初始化了一个stream，是因为这里OpenReadAsync只能做异步操作
// 异步的下一行是在另一个线程，而在App.cs里还不能通过Windows.UI.Core.CoreWindow.GetForCurrentThread().Dispatcher;
// 来拿到UI线程的Dispatcher
// 目前的UI线程Dispatcher是直到MainPage构造了之后才有的
// MainPage构造时拿到这个stream，然后用这个stream去构造他自己的Image
Uri imageUri = new Uri(CareConstDefine.MainPageBackgroundURI);
var rass = Windows.Storage.Streams.RandomAccessStreamReference.CreateFromUri(imageUri);
MainPageBackgroundImageStream = await rass.OpenReadAsync();
}