.net - C# downloading from Windows Azure Storage returns an empty file without any exceptions -


i'm trying use windows azure storage windows store app mobile services store images. made uploading work following guide:

http://www.windowsazure.com/en-us/develop/mobile/tutorials/upload-images-to-storage-dotnet/

however, couldn't find material on downloading files. couldn't find classes reference windows store version! if guide me documentation grateful.

anyway, wrote code doesn't seem work:

public static async system.threading.tasks.task downloaduserimage(sqluser userdata) {     var usersfolder = await getusersfolder();     var imageuri = new uri(userdata.imageuri);     var accountname = "<snip>";     var key = "<snip>";      storagecredentials cred = new storagecredentials(accountname, key);     cloudblobcontainer container = new cloudblobcontainer(new uri(string.format("https://{0}/{1}", imageuri.host, userdata.containername)), cred);     cloudblockblob blob = container.getblockblobreference(userdata.resourcename);      var imagefile = await usersfolder.createfileasync(userdata.id.tostring() + ".jpg", creationcollisionoption.replaceexisting);     using (var filestream = await imagefile.openasync(fileaccessmode.readwrite))     {         try         {             await blob.downloadtostreamasync(filestream);         }         catch (exception e)         {             tools.handleliveexception(e);         }     } }

this code results in empty file creation, doesn't throw exceptions whatsoever. if paste value of imageuri browser, starts downloading file , completes download successfully. however, program not, reason.

any help, please?

apparently, i've been opening stream in wrong way. here's fix:

public static async system.threading.tasks.task downloaduserimage(sqluser userdata) {     var usersfolder = await getusersfolder();     var imageuri = new uri(userdata.imageuri);     var accountname = "<snip>";     var key = "<snip>";      storagecredentials cred = new storagecredentials(accountname, key);     cloudblobclient client = new cloudblobclient(new uri(string.format("https://{0}", imageuri.host)), cred);     cloudblobcontainer container = client.getcontainerreference(userdata.containername);     var blob = await container.getblobreferencefromserverasync(userdata.resourcename);      var imagefile = await usersfolder.createfileasync(userdata.id.tostring() + ".jpg", creationcollisionoption.replaceexisting);     using (var filestream = await imagefile.openstreamforwriteasync())     {         try         {             await blob.downloadtostreamasync(filestream.asoutputstream());         }         catch (exception e)         {             tools.handleliveexception(e);         }     } }

it works now.


Comments

Post a Comment

Popular posts from this blog

monitor web browser programmatically in Android? -

i've got tricky question here. need users make payment bank (namely barclaycard) in uk. so, have https url , add parameters (such amount pay, order reference, etc) url, start http connection intent.actionview, redirect user browser can enter credit card details on bank's webpage , make payment our account successfully. far ? the code use below (i changed values privacy reasons) problem is, need app when user has completed/failed/cancelled payment. barclaycardautomatically redirects particular url when payment has succeeded, 1 if failed. there no way of knowing when barclaycard payment has succeeded go android app somehow ? button cardbutton = (button) findviewbyid(r.id.card_button); cardbutton.setonclicklistener(new view.onclicklistener() { @override public void onclick(view arg0) { string prehashstring = new string(); string prohashstring = new string(); string shapassphrase = new string(); shapassphrase = "gsvth£h70zkh...
Read more

Shrink a YouTube video to responsive width -

i have youtube video embedded on our website , when shrink screen tablet or phone sizes stops shrinking @ around 560px in width. standard youtube videos or there can add code make go smaller? you can make youtube videos responsive css. wrap iframe in div class of "videowrapper" , apply following styles: .videowrapper { float: none; clear: both; width: 100%; position: relative; padding-bottom: 56.25%; padding-top: 25px; height: 0; } .videowrapper iframe { position: absolute; top: 0; left: 0; width: 100%; height: 100%; } the .videowrapper div should inside responsive element. padding on .videowrapper necessary keep video collapsing. may have tweak numbers depending upon layout.
Read more

wpf - PdfWriter.GetInstance throws System.NullReferenceException -

i'm trying create pdf document using itextsharp 5.3.4 using following document document = new document(); filestream stm = new filestream(filename, filemode.create); pdfwriter writer = pdfwriter.getinstance(document, stm); i'm getting system.nullreferenceexception following stack trace: system.nullreferenceexception occurred hresult=-2147467261 message=la référence d'objet n'est pas définie à une instance d'un objet. source=itextsharp stacktrace: à itextsharp.text.version.getinstance() innerexception: i've verified neither document nor stm null, , if select "continue" in vs12 document created - exception thrown. updated itextsharp 5.4.0 , it's still occurring. can't find information on anywhere - got ideas? make sure not catching exceptions. nullreferenceexception can 1 caught , handled inside itextsharp, don't care it. fact can continue supports theory. change following setting verify: debug -> exceptions ...
Read more