How can I convert Windows.Storage.Streams.IRandomAccessStream to System.IO.Stream?
I'm using a C# library which accepts System.IO.Stream as input, but when I open files in Metro I get Windows.Storage.Streams.IRandomAccessStream.
The easiest way is to call AsStream.
You can convert Windows.Storage.Streams.IRandomAccessStream to a byte[] and then convert byte[] to a System.IO.Stream.
Byte[] from IRandomAccessStream
var file = await new FileOpenPicker().PickSingleFileAsync();
var fStream = await file.OpenAsync(FileAccessMode.Read);
var reader = new DataReader(fStream.GetInputStreamAt(0));
var bytes = new byte[fStream.Size];
await reader.LoadAsync((uint)fStream.Size);
reader.ReadBytes(bytes);
Stream from Byte[]
var stream = new MemoryStream(bytes);
Related
How to read the video file sent from the postman in body binary...
Content-Type : video/mp4
Content-Range: bytes 0-5119999/33230845
Content-Length: 5120000
IFormFile file;
using (var sr = new BufferedStream(Request.Body))
{
var byteArray = await sr.ReadAllBytes();
var stream = new MemoryStream(byteArray);
file = new FormFile(stream, 0, byteArray.Length, "testName", "testFileName");
string path = $"C:\\Projects\\vid{uploadRequest.BlockId}.mp4";
using FileStream str = new FileStream(path, FileMode.Create);
str.Position = 0;
await stream.CopyToAsync(str);
}
public static async Task<byte[]> ReadAllBytes(this Stream instream)
{
if (instream is MemoryStream)
return ((MemoryStream)instream).ToArray();
await using MemoryStream memoryStream = new MemoryStream();
await instream.CopyToAsync(memoryStream);
return memoryStream.ToArray();
}
When I save this file into C Disk and open it, says that: item is unplayable...
I am using an azure function with event grid trigger and CloudBlockBlob as input binding. The content is getting downloaded from CloudBlockBob using DownloadTextAsync(AccessCondition accessCondition, BlobRequestOptions options, OperationContext operationContext)
If the file being downloaded above is being generated using XmlDocument, DownloadTextAsync returns gibberish. However, if the file is generated by using FileStream, it works fine. PFB the implementations of generating the file-
Using XmlDocument
var stringwriter = new System.IO.StringWriter();
var serializer = new XmlSerializer(typeof(List<ContractName>), new XmlRootAttribute("RootAttributeName"));
serializer.Serialize(stringwriter, contractData);
var xmlString = stringwriter.ToString();
XmlDocument doc = new XmlDocument();
doc.LoadXml(xmlString);
doc.PreserveWhitespace = true;
doc.Save(fileName);
Using FileStream
var serializer = new XmlSerializer(typeof(List<ContractName>), new XmlRootAttribute("RootAttributeName"));
var file = new FileStream(fileName, FileMode.OpenOrCreate);
serializer.Serialize(file, contractData);
file.Close();
Code being used to download the content-
Using DownloadTextAsync
private static async System.Threading.Tasks.Task<string> DownloadContentAsync_DownloadTextAsync(string storageAccountConnectionString, string containerName, string blobName)
{
CloudBlobContainer container = GetContainer(storageAccountConnectionString, containerName);
ICloudBlob blob = await container.GetBlobReferenceFromServerAsync(blobName);
// Download the blob content
string xmlBlobContent =
await (blob as CloudBlockBlob).DownloadTextAsync(
null,
new BlobRequestOptions { LocationMode = LocationMode.PrimaryThenSecondary },
new OperationContext());
return xmlBlobContent;
}
Using DownloadToStreamAsync
private static async System.Threading.Tasks.Task<string> DownloadContentAsync_DownloadToStreamAsync(string storageAccountConnectionString, string containerName, string blobName)
{
CloudBlobContainer container = GetContainer(storageAccountConnectionString, containerName);
ICloudBlob blob = await container.GetBlobReferenceFromServerAsync(blobName);
// Download the blob content
MemoryStream resultStream = new MemoryStream();
await (blob as CloudBlockBlob).DownloadToStreamAsync(
resultStream,
null,
new BlobRequestOptions { LocationMode = LocationMode.PrimaryThenSecondary },
new OperationContext());
string xmlBlobContent = System.Text.Encoding.UTF8.GetString(resultStream.ToArray());
return xmlBlobContent;
}
Why there is a difference in response from DownloadTextAsync.
Updated 0713:
Figured it out. The root cause is that when you're using XmlDocument to generate the xml file, the encoding is utf-16. But for FileStream, it generates the xml file with encoding utf-8.
So, the solution is that, when using XmlDocument, we can specify the encoding to utf-8(no code change for FileStream). Sample code as below:
Generate xml file using XmlDocument:
//2. Using XMLDoc
serializer.Serialize(stringwriter, contractData);
var xmlString = stringwriter.ToString();
XmlDocument doc = new XmlDocument();
doc.LoadXml(xmlString);
doc.PreserveWhitespace = true;
string fileName = String.Format(#"C:\TestBlobDownloadContent\UsingXMLDoc" + count + ".xml");
//encoding as utf-8
using (TextWriter sw = new StreamWriter(fileName, false, Encoding.UTF8))
{
doc.Save(sw);
}
When read the xml file from blob storage via DownloadTextAsync() method, no need to specify the encoding option, like below:
// Download the blob content
string xmlBlobContent =
await (blob as CloudBlockBlob).DownloadTextAsync(
null,
new BlobRequestOptions { LocationMode = LocationMode.PrimaryThenSecondary },
new OperationContext());
Original answer:
This is due to the encode/decode issue.
Solution:
In the DownloadTextAsync() method, add parameter System.Text.Encoding.Unicode. Like below:
string xmlBlobContent =
await (blob as CloudBlockBlob).DownloadTextAsync(
System.Text.Encoding.Unicode,
null,
new BlobRequestOptions { LocationMode = LocationMode.PrimaryThenSecondary },
new OperationContext());
The test result:
How do I post GZip data using RestSharp. I have the following code but it isn't working as I would expect:
var restRequest = new RestRequest(url, Method.POST)
{
Timeout = Constants.DefaultTimeoutMilliseconds
};
var dataStream = new MemoryStream();
using (var zipStream = new GZipStream(dataStream, CompressionMode.Compress))
{
using (var writer = new StreamWriter(zipStream))
{
writer.Write(new DotNetXmlSerializer().Serialize(content));
}
}
var compressedBytes = dataStream.ToArray();
restRequest.AddParameter("application/x-gzip", compressedBytes, ParameterType.RequestBody);
return _restClient.Execute<TResponseData>(restRequest);
When I run this and check the wireshark trace, the compressedBytes variable is posted as
'System.Byte[]' - as if ToString() has been called on it despite the parameter being a system.object.
If I pass the compressed byte array through as a string using both Convert.ToBase64String() and Encoding.Utf8.GetString() then I am unable to decompress the GZip at the server. I simply get 'System.IO.InvalidDataException: The magic number in GZip header is not correct. Make sure you are passing in a GZip'.
Is there any way of posting Gzipped data using RestSharp?
Make sure you've updated to the latest version of RestSharp (like 104.4.0) as this was a bug in a previous version.
I think this was fixed in 104.2 where the PUT or POST of binary data ended up with the System.Byte[] being represented as the string.
Update your NuGet reference and try it again. Good luck!
var body = "some string";
var dataStream = new MemoryStream();
byte[] dataToCompress = Encoding.UTF8.GetBytes(body);
using (var memoryStream = new MemoryStream())
{
using (var gzipStream = new GZipStream(memoryStream, CompressionLevel.Optimal))
{
gzipStream.Write(dataToCompress, 0, dataToCompress.Length);
}
dataStream = memoryStream;
}
var client = new RestClient("url");
var request = new RestRequest("", Method.POST);
var compressedBytes = dataStream.ToArray();
request.AddHeader("Content-Encoding", "gzip");
request.AddParameter("application/x-gzip", compressedBytes, ParameterType.RequestBody);
//client.RemoteCertificateValidationCallback = (sender, certificate, chain, sslPolicyErrors) => true;
IRestResponse response = await client.ExecuteAsync(request);
Console.WriteLine(response.Content);
I am using the HttpClient class in Windows 8. With Windows Phone, I use
the WebClient class in combination with encoding to get the right encoding.
WebClient xml = new WebClient();
xml.Encoding = Encoding.GetEncoding("ISO-8859-1");
In Windows 8 it is looks like this:
HttpClient xml = new HttpClient();
HttpResponseMessage response = await xml.GetAsync(uri);
responsetext = await response.Content.ReadAsStringAsync();
How can I add a encoding to support German (umlaute)?
I don't have time to test right now, but have you tried using the HttpContent.ReadAsByteArrayAsync method (rather than ReadAsStringAsync) and encoding the resulting byte[] into ISO-8859-1 separately?
Change ReadAsStringAsync to ReadAsBufferAsync and parse result with required encoding
var buffer = await response.Content.ReadAsBufferAsync();
byte [] rawBytes = new byte[buffer.Length];
using (var reader = DataReader.FromBuffer(buffer))
{
reader.ReadBytes(rawBytes);
}
var res = Encoding.UTF8.GetString(rawBytes, 0, rawBytes.Length);
How do I get access to the underlying response stream from a WebOperationContext?
Change the return type of the method to Stream.
The code I use for returning an html/text stream is:
public Stream GetHTML()
{
MemoryStream stream = new MemoryStream();
StreamWriter writer = new StreamWriter(stream, Encoding.UTF8);
writer.Write("HTML STRING");
conn.Close();
writer.Flush();
stream.Position = 0;
WebOperationContext.Current.OutgoingResponse.ContentType = "text/html";
return stream;
}
Obviously you'll have a different content type, and I don't think you'll have to use UTF8 encoding.