private async void submit_comment(object sender, RoutedEventArgs e)
{
String input = txtInput.Text;
//getting the DocumentsLibrary folder where a file is to be created and then creating the example.txt file
//and storing the StorageFile object that is returned:
try
{
StorageFolder storageFolder = KnownFolders.DocumentsLibrary;
StorageFile sampleFile = await storageFolder.GetFileAsync("sample.txt");
//Writing to file
await Windows.Storage.FileIO.WriteTextAsync(sampleFile, input);
}catch(Exception)
{
}
}
Related
I want to upload and save a zipped folder to a path on my disk drive using .net core 3.0 but the zipped folder is saving as 0bytes
[HttpPost]
[ValidateAntiForgeryToken()]
[RequestFormLimits(MultipartBodyLengthLimit = 20971520)]//max size should be 20MB
public IActionResult AddFile(List<IFormFile> files)
{
IActionResult ar = null;
try
{
if (id != 0)
{
foreach(var singlefile in files)
{
var ext = Path.GetExtension(singlefile.FileName).ToLowerInvariant();
//begin saving procedure
if(singlefile.Length > 0 && singlefile.Length <= Convert.ToInt32(_config.Value.FileSizeLimit))
{
var filepath = Path.Combine(_config.Value.StoredFilesPath, Path.GetRandomFileName().Split('.')[0] + ext);
using(var stream = System.IO.File.Create(filepath))
{
singlefile.CopyToAsync(stream);
}
}
}
}
catch (Exception e)
{
_log.Error(e);
}
return ar;
}
Please What am i missing out? I can save files with other extensions using this same piece of code, it saves and i can view properly but only .zip files saves as 0bytes
You didn't wait for the copy task to complete. Try change the method to an async action:
public async Task<IActionResult> AddFile(List<IFormFile> files)
{
...
using(var stream = System.IO.File.Create(filepath))
{
await singlefile.CopyToAsync(stream); // await here, otherwise the stream is disposed quickly
}
...
}
I'm trying to include some rich text with my app, but the app hangs when trying to load the text.
// Here is the initiating call:
await aboutDialog.ShowAsync();
// This code hangs on the second line
private async void Page_Loaded(object sender, RoutedEventArgs e)
{
var stream = Assembly.GetExecutingAssembly().GetManifestResourceStream("XamlSandbox.cities.rtf");
myRichEditBox.Document.LoadFromStream(Windows.UI.Text.TextSetOptions.FormatRtf, stream.AsRandomAccessStream());
}
// This code works OK
private async void Page_Loaded(object sender, RoutedEventArgs e)
{
var picker = new Windows.Storage.Pickers.FileOpenPicker();
var file = await picker.PickSingleFileAsync();
var fileStream = await file.OpenAsync(FileAccessMode.Read);
myRichEditBox.Document.LoadFromStream(Windows.UI.Text.TextSetOptions.FormatRtf, fileStream);
}
I've tried loading the embedded resource into a memory stream and using that, but that hangs too. Any ideas?
Here is how to properly load the embedded resource in UWP:
var rtfUri = new Uri("ms-appx:///cities.rtf");
var file = await StorageFile.GetFileFromApplicationUriAsync(rtfUri);
var stream = file.OpenAsync(FileAccessMode.Read);
myRichEditBox.Document.LoadFromStream(Windows.UI.Text.TextSetOptions.FormatRtf, stream.GetResults());
I want to set image.Source via async stream in an UWP application. Otherwise the image will flicker when switch to other image source.
My code is as below. And the log shows it works. Certainly I put 2 image files in the corresponding path before I test the demo code.
But in fact I did not see any picture shown, why?
Log:
111111111111 image file path = C:\Users\tomxu\AppData\Local\Packages\a0ca0192-f41a-43ca-a3eb-f128a29b00c6_1qkk468v8nmy0\LocalState\2.jpg
22222222222
33333333333333
4444444444444
The thread 0x6d38 has exited with code 0 (0x0).
The thread 0x6a34 has exited with code 0 (0x0).
111111111111 image file path = C:\Users\tomxu\AppData\Local\Packages\a0ca0192-f41a-43ca-a3eb-f128a29b00c6_1qkk468v8nmy0\LocalState\1.jpg
22222222222
33333333333333
4444444444444
Code:
private async void setImageSource(string imageFilePath)
{
StorageFile sFile = await StorageFile.GetFileFromPathAsync(imageFilePath);
Debug.WriteLine("111111111111 image file path = " + imageFilePath);
Stream fileStream = await sFile.OpenStreamForReadAsync();
Debug.WriteLine("22222222222");
InMemoryRandomAccessStream ras = new InMemoryRandomAccessStream();
Debug.WriteLine("33333333333333");
await fileStream.CopyToAsync(ras.AsStreamForRead());
Debug.WriteLine("4444444444444");
BitmapImage bi = new BitmapImage();
bi.SetSource(ras);
image1.Source = bi;
}
private async void Button_Click(object sender, RoutedEventArgs e)
{
string fullFolder = ApplicationData.Current.LocalFolder.Path;
if (count % 2 == 1)
{
setImageSource(fullFolder + #"\1.jpg");
//image1.Source = new BitmapImage(new Uri(#"ms-appx:///Assets/1.jpg"));
}
else
{
setImageSource(fullFolder + #"\2.jpg");
//image1.Source = new BitmapImage(new Uri(#"ms-appx:///Assets/2.jpg"));
}
count++;
}
Here is an example of how I convert a base64 image string to a BitmapImage..
var ims = new InMemoryRandomAccessStream();
var bytes = Convert.FromBase64String(base64String);
var dataWriter = new DataWriter(ims);
dataWriter.WriteBytes(bytes);
await dataWriter.StoreAsync();
ims.Seek(0);
var img = new BitmapImage();
img.SetSource(ims);
ims.Dispose();
return img;
Try some of the things I'm doing there. Like I notice your code is not setting the seek of the InMemoryReadAccessStream
For your question, I have something to clarify with you.
Your pictures are always in the application data folder. If you want to show it at runtime by programming, the easy way is using the ms-appdata URI scheme to refer to files that come from the app's local, roaming, and temporary data folders. Then, you could use this URL to initialize the BitmapImage object. With this way, you don't need to manually manipulate the file stream.
private void setImageSource(int i)
{
BitmapImage bi = new BitmapImage(new Uri("ms-appdata:///local/"+i+".png"));
image1.Source = bi;
}
private int count = 0;
private void Button_Click(object sender, RoutedEventArgs e)
{
if (count % 2 == 1)
{
setImageSource(1);
}
else
{
setImageSource(2);
}
count++;
}
If you say you have to manipulate the file stream to initialize the BitmaImage, then please add some break points to debug your code. If you add break points to check the InMemoryRandomAccessStream after call CopyToAsync method, you will see that its size is 0. It meant that the file stream has not been wrote to it. To solve this issue, you need to set a buffer size for it. Note: you used ras.AsStreamForRead() method, it's incorrect. You're writing stream to it, so you need to call ras.AsStreamForWrite().
The code looks like the following:
private async void setImageSource(string imageFilePath)
{
StorageFile sFile = await StorageFile.GetFileFromPathAsync(imageFilePath);
using (Stream fileStream = await sFile.OpenStreamForReadAsync())
{
using (InMemoryRandomAccessStream ras = new InMemoryRandomAccessStream())
{
await fileStream.CopyToAsync(ras.AsStreamForWrite((int)fileStream.Length));
ras.Seek(0);
BitmapImage bi = new BitmapImage();
bi.SetSource(ras);
img.Source = bi;
}
}
}
private int count = 0;
private void Button_Click(object sender, RoutedEventArgs e)
{
string fullFolder = ApplicationData.Current.LocalFolder.Path;
if (count % 2 == 1)
{
setImageSource(fullFolder + #"\1.jpg");
}
else
{
setImageSource(fullFolder + #"\2.jpg");
}
count++;
}
In addition, like #visc said, you need to call ras.Seek(0) method to reset the stream to beginning, else the image will not show there.
A task was canceled exception is thrown when Im trying to call fileTransferUtility.UploadAsync to upload a file i S3. I'm using dot net core 2.0 and trying to Upload file to S3.What is that i'm doing wrong in the below code?
Is is something to do with Timeout? If so how to set time for s3 bucket? or Do I have to set some properties on S3 bucket?
Below is my controller code:
public class UploadController : Controller
{
private IHostingEnvironment _hostingEnvironment;
private AmazonS3Client _s3Client = new AmazonS3Client(RegionEndpoint.APSoutheast1);
private string _bucketName = "fileupload";//this is my Amazon Bucket name
private static string _bucketSubdirectory = String.Empty;
private string uploadWithKeyName = "testFile";
public UploadController(IHostingEnvironment environment)
{
_hostingEnvironment = environment;
}
[HttpPost("UploadExcelData")]
public async Task PostExcelData()
{
var files = Request.Form.Files;
var stringVal = Request.Form.Keys;
long size = files.Sum(f => f.Length);
foreach (var formFile in files)
{
if (formFile.Length > 0)
{
var filename = ContentDispositionHeaderValue
.Parse(formFile.ContentDisposition)
.FileName
.TrimStart().ToString();
filename = _hostingEnvironment.WebRootPath + $#"\uploads" + $#"\{formFile.FileName}";
size += formFile.Length;
using (var fs = System.IO.File.Create(filename))
{
formFile.CopyTo(fs);
fs.Flush();
}//these code snippets saves the uploaded files to the project directory
await UploadToS3(filename);//this is the method to upload saved file to S3
}
}
// return Ok();
}
public async Task UploadToS3(string filePath)
{
try
{
TransferUtility fileTransferUtility = new
TransferUtility(_s3Client);
string bucketName;
if (_bucketSubdirectory == "" || _bucketSubdirectory == null)
{
bucketName = _bucketName; //no subdirectory just bucket name
}
else
{ // subdirectory and bucket name
bucketName = _bucketName + #"/" + _bucketSubdirectory;
}
// 1. Upload a file, file name is used as the object key name.
await fileTransferUtility.UploadAsync(filePath, bucketName, uploadWithKeyName).ConfigureAwait(false);
Console.WriteLine("Upload 1 completed");
}
catch (AmazonS3Exception s3Exception)
{
Console.WriteLine(s3Exception.Message,
s3Exception.InnerException);
}
catch (Exception ex)
{
Console.WriteLine("Unknown error", ex.Message);
}
}
}
I forgot to pass the credentials :
private AmazonS3Client _s3Client = new AmazonS3Client(DynamoDbCRUD.Credentials.AccessKey,DynamoDbCRUD.Credentials.SecretKey, RegionEndpoint.APSoutheast1);
This line works fine.
I'm new to win8 app programming but has been assigned to write a windows store app to capture customers' signature and save it to SQL Server. After some research I found a great tutorial
http://www.codeproject.com/Articles/416878/Metro-Paint which shows how to draw and save the image locally. My question is how do I use the InkManager class in the tutorial to save the image to byte arrays so that I can save the image to SQLServer? Thanks!
private async void btnSaveWritingAsImage_Click(object sender, RoutedEventArgs e)
{
if (MyInkManager.GetStrokes().Count > 0)
{
try
{
Windows.Storage.Pickers.FileSavePicker SavePicker = new Windows.Storage.Pickers.FileSavePicker();
SavePicker.SuggestedStartLocation = Windows.Storage.Pickers.PickerLocationId.Desktop;
SavePicker.DefaultFileExtension = ".png";
SavePicker.FileTypeChoices.Add("PNG", new string[] { ".png" });
SavePicker.FileTypeChoices.Add("JPG", new string[] { ".jpg" });
StorageFile filesave = await SavePicker.PickSaveFileAsync();
IOutputStream ab = await filesave.OpenAsync(FileAccessMode.ReadWrite);
if (ab != null)
await MyInkManager.SaveAsync(ab);
}
catch (Exception)
{
var MsgDlg = new MessageDialog("Only handwriting can be saved as image.", "Error while saving");
MsgDlg.ShowAsync();
}
}
else
{
var MsgDlg = new MessageDialog("Only handwriting can be saved as image.", "Error while saving");
await MsgDlg.ShowAsync();
}
}
add: (IBuffer.ToArray() is defined in WindowsRuntimeBufferExtensions)
using System.Runtime.InteropServices.WindowsRuntime;
then just do:
var buffer = await FileIO.ReadBufferAsync(image);//replace ab instead of image
var bytes = buffer.ToArray();