Using this code:
private async void writeToStorage(string contents)
{
var roamingFolder = Windows.Storage.ApplicationData.Current.RoamingFolder;
var storFile = await roamingFolder.CreateFileAsync("test", CreationCollisionOption.ReplaceExisting);
await Windows.Storage.FileIO.WriteTextAsync(storFile, contents);
}
Do I need to close the file? And if so.. how do I do that? There is no Close on the storFile.
No you do not need to close this file.
StorageFolder and StorageFile instances are just a pointers to a folder and a file.
Using the WriteTextAsync method will open/write and close automatically the stream.
Related
I have an image file in my projects directory, I need to Post it to another api but no success so far.
I have tried to mock IFormFile but it seems like its empty or something.
any ideas?
here is the extension I found and used but it doesn't seem to work.
public static IFormFile AsMockIFormFile(this FileInfo physicalFile)
{
var fileMock = new Mock<IFormFile>();
var ms = new MemoryStream();
var writer = new StreamWriter(ms);
writer.Write(physicalFile.OpenRead());
writer.Flush();
ms.Position = 0;
var fileName = physicalFile.Name;
//Setup mock file using info from physical file
fileMock.Setup(_ => _.FileName).Returns(fileName);
fileMock.Setup(_ => _.Length).Returns(ms.Length);
fileMock.Setup(m => m.OpenReadStream()).Returns(ms);
fileMock.Setup(m => m.ContentDisposition).Returns(string.Format("inline; filename={0}", fileName));
//...setup other members (code removed for brevity)
return fileMock.Object;
}
then when I try to copy this image to the folder to see if its actualy an image the image is 0 bytes:
var stream = System.IO.File.Create(#"wwwroot\images\dsadas.jpeg");
await fileMock.Object.CopyToAsync(stream);
if there is another way, or a way to make this work I would appreciate it!
I am using this code to download file from my bot.
this work in local but does'nt work in server.
i'm using webhook. please help me.
thanks
private async Task SaveFileAsync(Update update, TelegramBotClient bot)
{
string fs = AppDomain.CurrentDomain.BaseDirectory+ #"Uploads\";
var FileId = update.Message.Document.FileId;
var fileInfo = await bot.GetFileAsync(FileId);
var filename = fileInfo.FileId + "." + fileInfo.FilePath.Split('.').Last();
string strFilePath = fs + filename;
FileStream saveImageStream = System.IO.File.Open(strFilePath, System.IO.FileMode.Create, FileAccess.ReadWrite);
await bot.DownloadFileAsync(fileInfo.FilePath, saveImageStream, CancellationToken.None);
saveImageStream.Dispose();
}
enter image description here
I solved the problem.
this method should be void and without async.
and then we must remove await before bot.DownloadFileAsync
I have a .NET Core API that I'd like to extend to save uploaded images asynchronously.
Using ImageSharp I should be able to check uploads and resize if predefined size limits are exceeded. However I can't get a simple async save working.
A simple (non-async) save to file works without problem:
My Controller extracts IFormFile from the upload and calls the following method without any problem
public static void Save(IFormFile image, string imagesFolder)
{
var fileName = Path.Combine(imagesFolder, image.FileName);
using (var stream = image.OpenReadStream())
using (var imgIS = Image.Load(stream, out IImageFormat format))
{
imgIS.Save(fileName);
}
}
ImageSharp is currently lacking async methods so a workaround is necessary.
The updated code below saves the uploaded file but the format is incorrect - when viewing the file I get the message "It appears we don't support this file format".
The format is extracted from the ImageSharp Load method. and used when saving to MemoryStream.
MemoryStream CopyToAsync method is used to save to FileStream to make the upload asynchronous.
public static async void Save(IFormFile image, string imagesFolder)
{
var fileName = Path.Combine(imagesFolder, image.FileName);
using (var stream = image.OpenReadStream())
using (var imgIS = Image.Load(stream, out IImageFormat format))
using (var memoryStream = new MemoryStream())
using (var fileStream = new FileStream(fileName, FileMode.OpenOrCreate))
{
imgIS.Save(memoryStream, format);
await memoryStream.CopyToAsync(fileStream).ConfigureAwait(false);
fileStream.Flush();
memoryStream.Close();
fileStream.Close();
}
}
I can't work out whether the issue is with ImageSharp Save to MemoryStream, or the MemoryStream.CopyToAsync.
I'm currently getting 404 on SixLabors docs - hopefully not an indication that the project has folded.
How can I make the upload async and save to file in the correct format?
CopyToAsync copies a stream starting at its current position. You must change the current position of memoryStream back to start before copying:
// ...
memoryStream.Seek(0, SeekOrigin.Begin);
await memoryStream.CopyToAsync(fileStream).ConfigureAwait(false);
// ...
This one is hard to explain, so I give you some actual and pseudo code:
try
{
// If source (a string) points towards a file that is available with
// StorageFile.GetFileFromPathAsync(), just open the file that way.
// If that is not possible, use the path to look up an Access Token
// and use the file from the StorageFolder gotten via that token.
StorageFile file = await GetFileFromAccessList(source);
if (file != null)
{
bitmap = new BitmapImage();
using (IRandomAccessStream fileStream = await file.OpenAsync(FileAccessMode.Read))
{
await bitmap.SetSourceAsync(fileStream);
}
}
}
catch (Exception e)
{
string s = e.Message;
bitmap = null;
}
with the following method:
public async Task<StorageFile> GetFileFromAccessList(string path)
{
StorageFile result = null;
if (String.IsNullOrEmpty(path) == false)
try
{
// Try to access to file directly...
result = await StorageFile.GetFileFromPathAsync(path);
}
catch (Exception)
{
result = null;
try
{
// See if the folder this thing is in is in the access list...
StorageFolder folder = await GetFolderFromAccessList(Path.GetFullPath(path));
// If there is a folder, try that.
if (folder != null)
result = await folder.GetFileAsync(Path.GetFileName(path));
}
catch (Exception)
{
result = null;
}
}
return result;
}
The resulting bitmap is used in Image.SetSource() as an ImageSource.
Now what kills me: this call works perfectly, fast and rock solid for files stored within the apps folder or KnownFolders. So it works like a charm when I don't need an Access Token. Windows.Storage.AccessCache.StorageApplicationPermissions.FutureAccessList.GetFolderAsync(token)
However, it breaks if I have to use an access token, just not all the time
This code does not break immediately: it breaks when I try to open more than 5-7 source files at the same time.
Repeat that: this works if I display 5-7 images. If I try to open more, it freezes the PC. No such problem occurs when I open StorageFiles without tokens.
I can access such files using normal file operations. I can create bitmaps from them, process them, the work.
I just cannot make them a source of an XAML Image.
Any thoughts?
Ah clarity.
So it turns out that using the DataContextChanged event to refresh the bitmap through Image.SetSource() is the murder weapon.
The solution: declare a property of type BitmapSource. Bind the Image.Source to that property. Update the property with the loaded bitmap upon Image.Loaded and Image.DataContextChanged. Works stable and fast now in all conditions I was able to test.
When I upload an image file to a blob, the image is uploaded apparently successfully (no errors). When I go to cloud storage studio, the file is there, but with a size of 0 (zero) bytes.
The following is the code that I am using:
// These two methods belong to the ContentService class used to upload
// files in the storage.
public void SetContent(HttpPostedFileBase file, string filename, bool overwrite)
{
CloudBlobContainer blobContainer = GetContainer();
var blob = blobContainer.GetBlobReference(filename);
if (file != null)
{
blob.Properties.ContentType = file.ContentType;
blob.UploadFromStream(file.InputStream);
}
else
{
blob.Properties.ContentType = "application/octet-stream";
blob.UploadByteArray(new byte[1]);
}
}
public string UploadFile(HttpPostedFileBase file, string uploadPath)
{
if (file.ContentLength == 0)
{
return null;
}
string filename;
int indexBar = file.FileName.LastIndexOf('\\');
if (indexBar > -1)
{
filename = DateTime.UtcNow.Ticks + file.FileName.Substring(indexBar + 1);
}
else
{
filename = DateTime.UtcNow.Ticks + file.FileName;
}
ContentService.Instance.SetContent(file, Helper.CombinePath(uploadPath, filename), true);
return filename;
}
// The above code is called by this code.
HttpPostedFileBase newFile = Request.Files["newFile"] as HttpPostedFileBase;
ContentService service = new ContentService();
blog.Image = service.UploadFile(newFile, string.Format("{0}{1}", Constants.Paths.BlogImages, blog.RowKey));
Before the image file is uploaded to the storage, the Property InputStream from the HttpPostedFileBase appears to be fine (the size of the of image corresponds to what is expected! And no exceptions are thrown).
And the really strange thing is that this works perfectly in other cases (uploading Power Points or even other images from the Worker role). The code that calls the SetContent method seems to be exactly the same and file seems to be correct since a new file with zero bytes is created at the correct location.
Does any one have any suggestion please? I debugged this code dozens of times and I cannot see the problem. Any suggestions are welcome!
Thanks
The Position property of the InputStream of the HttpPostedFileBase had the same value as the Length property (probably because I had another file previous to this one - stupid I think!).
All I had to do was to set the Position property back to 0 (zero)!
I hope this helps somebody in the future.
Thanks Fabio for bringing this up and solving your own question. I just want to add code to whatever you have said. Your suggestion worked perfectly for me.
var memoryStream = new MemoryStream();
// "upload" is the object returned by fine uploader
upload.InputStream.CopyTo(memoryStream);
memoryStream.ToArray();
// After copying the contents to stream, initialize it's position
// back to zeroth location
memoryStream.Seek(0, SeekOrigin.Begin);
And now you are ready to upload memoryStream using:
blockBlob.UploadFromStream(memoryStream);