I am working on a web based OHIF Dicom viewer. I am using clear canvas as my PACs server. So I developed one broker application in .net core which works like WADO-RS and supply information to OHIF viewer from clear canvas. In my broker application I am passing metadata to OHIF viewer in json format by using FO-dicom json converter which converts dcm file into Json string.
My code for sending metadata:
var files = Directory.GetFiles(directory);
List<JObject> lstjo = new List<JObject>();
JObject jo;
foreach (var file in files)
{
var dicomDirectory = DicomFile.Open(file, FileReadOption.ReadAll);
if (dicomDirectory.Dataset.InternalTransferSyntax.UID.UID != DicomTransferSyntax.ImplicitVRLittleEndian.UID.UID)
{
var transcoder = new DicomTranscoder(dicomDirectory.Dataset.InternalTransferSyntax, DicomTransferSyntax.ImplicitVRLittleEndian);
dicomDirectory = transcoder.Transcode(dicomDirectory);
}
JsonDicomConverter dicomConverter = new JsonDicomConverter();
StringBuilder sb = new StringBuilder();
StringWriter sw = new StringWriter(sb);
JsonWriter writer = new JsonTextWriter(sw);
Newtonsoft.Json.JsonSerializer serializer = new Newtonsoft.Json.JsonSerializer();
dicomConverter.WriteJson(writer, dicomDirectory.Dataset, serializer);
jo = JObject.Parse(sb.ToString());
// jo.Property("7FE00010").Remove();
retJsonstring += jo.ToString() + ",";
}
if (retJsonstring.Length > 6)
{
retJsonstring = retJsonstring.Substring(0, retJsonstring.Length - 1) + "]";
}
else
{
retJsonstring += "]";
}
retJsonstring = retJsonstring.Replace("\r", "").Replace("\n", "");
}
return retJsonstring;
During passing metadata there is no issue in Ohif viewer. After then OHIF viewer sending WADORS request for frames to display. My broker application also send responding for that request in multipart.
My code for sending Multipart response :
{
var dicomFile = DicomFile.Open(path, FileReadOption.ReadAll);
string transfersyntax = dicomFile.Dataset.InternalTransferSyntax.UID.UID;
MemoryStream streamContent = new MemoryStream();
if (transfersyntax != DicomTransferSyntax.ImplicitVRLittleEndian.UID.UID)
{
var transcoder = new DicomTranscoder(dicomFile.Dataset.InternalTransferSyntax, DicomTransferSyntax.ImplicitVRLittleEndian);
dicomFile = transcoder.Transcode(dicomFile);
}
dicomFile.Save(streamContent);
DicomImage img = new DicomImage(dicomFile.Dataset, 0);
streamContent.Seek(0, SeekOrigin.Begin);
string boundary = Guid.NewGuid().ToString();
MultipartContent multipartContent = new MultipartContent();
//newFile.Save(multipartContent.Stream);
multipartContent.Stream = streamContent;// File.OpenRead(path);
multipartContent.ContentType = "application/octet-stream";
multipartContent.transfersyntax = dicomFile.Dataset.InternalTransferSyntax.UID.UID;
multipartContent.FileName = "";
multiContentResult = new MultipartResult("related", boundary) { multipartContent };
return multiContentResult;
}
Mulitpart class and MulticontentResult Class:
public class MultipartContent
{
public string ContentType { get; set; }
public string FileName { get; set; }
public Stream Stream { get; set; }
public string transfersyntax { get; set; }
}
public class MultipartResult : Collection<MultipartContent>, IActionResult
{
private readonly System.Net.Http.MultipartContent content;
public MultipartResult(string subtype = "byteranges", string boundary = null)
{
if (boundary == null)
{
this.content = new System.Net.Http.MultipartContent(subtype);
}
else
{
this.content = new System.Net.Http.MultipartContent(subtype, boundary);
}
}
public async Task ExecuteResultAsync(ActionContext context)
{
foreach (var item in this)
{
if (item.Stream != null)
{
var content = new StreamContent(item.Stream);
if (item.ContentType != null)
{
content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue(item.ContentType);
content.Headers.ContentType.Parameters.Add(new System.Net.Http.Headers.NameValueHeaderValue("transfer-syntax", item.transfersyntax));
}
this.content.Add(content);
}
}
context.HttpContext.Response.ContentLength = content.Headers.ContentLength;
context.HttpContext.Response.ContentType = content.Headers.ContentType.ToString();
await content.CopyToAsync(context.HttpContext.Response.Body);
}
}
After sending WAROrs response , I getting error in OHIF viewer in RangeError: offset is out of bounds in stackviewport.js during set pixeldata flat32array to scaledata flat32array like below Image
So I inspect in browser after then I come know that Pixel data size and scaledata size is different like below image..
To verify my dcm file I checked with ohif viewer by directly opened those file in https://v3-demo.ohif.org/local. It is opening properly.
So what are possible reason for this issue ? how to rectify?
Related
Whenever I upload a file I want to have it automatically converted into .pdf (I am doing that using NuGet). The thing is the upload scheme is done using relative paths. I do not know what to put into these parentheses:
var wordDocument = appWord.Documents.Open(uploadedFile);
What should I replace uploadedFile with in order to work? I will leave my relative path mapping code below:
public IActionResult Index1()
{
// Get files from the server
var model = new FilesViewModel();
foreach (var item in Directory.GetFiles(Path.Combine(Directory.GetCurrentDirectory(), "upload")))
{
model.Files.Add(
new FileDetails { Name = System.IO.Path.GetFileName(item), Path = item });
}
return View(model);
}
[HttpPost]
public IActionResult Index1(IFormFile[] files)
{
// Iterate each files
foreach (var file in files)
{
// Get the file name from the browser
var fileName = System.IO.Path.GetFileName(file.FileName);
// Get file path to be uploaded
var filePath = Path.Combine(Directory.GetCurrentDirectory(), "upload", fileName);
// Check If file with same name exists and delete it
if (System.IO.File.Exists(filePath))
{
System.IO.File.Delete(filePath);
}
// Create a new local file and copy contents of uploaded file
using (var localFile = System.IO.File.OpenWrite(filePath))
using (var uploadedFile = file.OpenReadStream())
{
var appWord = new Application();
if (appWord.Documents != null)
{
//yourDoc is your word document
var wordDocument = appWord.Documents.Open(uploadedFile);
string pdfDocName = "pdfDocument.pdf";
if (wordDocument != null)
{
wordDocument.ExportAsFixedFormat(pdfDocName,
WdExportFormat.wdExportFormatPDF);
wordDocument.Close();
}
appWord.Quit();
}
uploadedFile.CopyTo(localFile);
}
}
ViewBag.Message = "Files are successfully uploaded";
// Get files from the server
var model = new FilesViewModel();
foreach (var item in Directory.GetFiles(Path.Combine(Directory.GetCurrentDirectory(), "upload")))
{
model.Files.Add(
new FileDetails { Name = System.IO.Path.GetFileName(item), Path = item });
}
return View(model);
}
public async Task<IActionResult> Download(string filename)
{
if (filename == null)
return Content("filename is not availble");
var path = Path.Combine(Directory.GetCurrentDirectory(), "upload", filename);
var memory = new MemoryStream();
using (var stream = new FileStream(path, FileMode.Open))
{
await stream.CopyToAsync(memory);
}
memory.Position = 0;
return File(memory, GetContentType(path), Path.GetFileName(path));
}
private string GetContentType(string path)
{
var types = GetMimeTypes();
var ext = Path.GetExtension(path).ToLowerInvariant();
return types[ext];
}
private Dictionary<string, string> GetMimeTypes()
{
return new Dictionary<string, string>
{
{".txt", "text/plain"},
{".pdf", "application/pdf"},
{".doc", "application/vnd.ms-word"},
{".docx", "application/vnd.ms-word"},
{".xls", "application/vnd.ms-excel"},
{".xlsx", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"},
{".png", "image/png"},
{".jpg", "image/jpeg"},
{".jpeg", "image/jpeg"},
{".gif", "image/gif"},
{".csv", "text/csv"}
};
}
In my app I need to pass images from one page to another page image view to display. I am taking a photo from camera and do some stuffs, then I want to send that images to the second page.
if (await isCamAvailable())
{
MediaFile photo1 = await CrossMedia.Current.TakePhotoAsync(new StoreCameraMediaOptions() { Directory = "NewBusiness", Name = "image1.jpg", PhotoSize = PhotoSize.MaxWidthHeight, MaxWidthHeight = 1024, CompressionQuality = 95 });
if (photo1 != null)
{
PhotoImage1.Source = ImageSource.FromStream(() => { return photo1.GetStream(); });
countList.Remove("a");
countList.Add("a");
}
}
Then I am added it to a string array by doing
private List<string> sendImgList = new List<string>();
sendImgList.Add(createImgByteString(photo1.GetStream()));
private string createImgByteString(Stream data)
{
var bytes = new byte[data.Length];
return Convert.ToBase64String(bytes);
}
Then from second page (for testing i just added only one image)
foreach (string ss in imgList) {
byte[] Base64Stream = Convert.FromBase64String(ss);
imgView.Source = ImageSource.FromStream(() => new MemoryStream(Base64Stream));
}
I followed this example. But image not showing.
https://forums.xamarin.com/discussion/139360/how-to-transfer-images-from-one-page-to-another
Also getting this in logcat..
[0:] ImageLoaderSourceHandler: Image data was invalid: Xamarin.Forms.StreamImageSource05-29 14:22:43.758 W/monodroid-assembly( 8737): typemap: unable to find mapping to a Java type from managed type 'System.Byte, mscorlib'
It seems that you used the Media.Plugin . Why don't you pass the ImageSource directly?
If you do want to convert it to byte array , check the following code
public byte[] GetImageStreamAsBytes(Stream input)
{
var buffer = new byte[16*1024];
using (MemoryStream ms = new MemoryStream())
{
int read;
while ((read = input.Read(buffer, 0, buffer.Length)) > 0)
{
ms.Write(buffer, 0, read);
}
return ms.ToArray();
}
}
var imgDate = GetImageStreamAsBytes(photo1.GetStream());
It would be better to pass the byte array directly .
The best mode to pass parameter in pages is with Prism.
https://prismlibrary.com/docs/xamarin-forms/navigation/passing-parameters.html
>
_navigationService.NavigateAsync(new Uri("MainPage", new NavigationParameters
{
{ "key_parameter", image }
})));
And on other page:
>
public override void OnNavigatedTo(INavigationParameters parameters)
{
image = (Image)parameters["key_parameter"];
}
I have the following two methods that handles taking photos from a camera and picking photos from a library. They're both similar methods as at the end of each method, I get an ImageSource back from the Stream and I pass it onto another page which has an ImageSource binding ready to be set. These two method work perfectly. The next step now is to save the Image in SQLite so I can show the images in a ListView later on. My question for the XamGods (Xamarin Pros =), what is the best way to save image in SQLite in 2019? I have been in the forums for hours and I still don't have a tunnel vision on what I want to do. I can either
Convert Stream into an array of bytes to save in Sqlite.
Convert ImageSource into an array of bytes (messy/buggy).
Somehow retrieve the actual Image selected/taken and convert that into an array of bytes into SQLite
I'm sorry if my question is general, but Xamarin does not provide a clear-cut solution on how to save images in SQLite and you can only find bits and pieces of solutions throughout the forums listed below.
How to save and retrieve Image from Sqlite
Load Image from byte[] array.
Creating a byte array from a stream
Thank you in advance!
private async Task OnAddPhotoFromCameraSelected()
{
Console.WriteLine("OnAddPhotoFromCameraSelected");
var photo = await Plugin.Media.CrossMedia.Current.TakePhotoAsync(new Plugin.Media.Abstractions.StoreCameraMediaOptions() { });
var stream = photo.GetStream();
photo.Dispose();
if (stream != null)
{
ImageSource cameraPhotoImage = ImageSource.FromStream(() => stream);
var parms = new NavigationParameters();
parms.Add("image", cameraPhotoImage);
var result = await NavigationService.NavigateAsync("/AddInspectionPhotoPage?", parameters: parms);
if (!result.Success)
{
throw result.Exception;
}
}
}
private async Task OnAddPhotoFromLibrarySelected()
{
Console.WriteLine("OnAddPhotoFromLibrarySelected");
Stream stream = await DependencyService.Get<IPhotoPickerService>().GetImageStreamAsync();
if (stream != null)
{
ImageSource selectedImage = ImageSource.FromStream(() => stream);
var parms = new NavigationParameters();
parms.Add("image", selectedImage);
parms.Add("stream", stream);
var result = await NavigationService.NavigateAsync("/AddInspectionPhotoPage?", parameters: parms);
if (!result.Success)
{
throw result.Exception;
}
}
}
As Jason said that you can save image path into sqlite database, but if you still want to save byte[] into sqlite database, you need to convert stream into byte[] firstly:
private byte[] GetImageBytes(Stream stream)
{
byte[] ImageBytes;
using (var memoryStream = new System.IO.MemoryStream())
{
stream.CopyTo(memoryStream);
ImageBytes = memoryStream.ToArray();
}
return ImageBytes;
}
Then load byte[] from sqlite, converting into stream.
public Stream BytesToStream(byte[] bytes)
{
Stream stream = new MemoryStream(bytes);
return stream;
}
For simple sample, you can take a look:
Insert byte[] in sqlite:
private void insertdata()
{
var path = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "sqlite1.db3");
using (var con = new SQLiteConnection(path))
{
Image image = new Image();
image.Content = ConvertStreamtoByte();
var result = con.Insert(image);
sl.Children.Add(new Label() { Text = result > 0 ? "insert successful insert" : "fail insert" });
}
}
Loading image from sqlite:
private void getdata()
{
var path = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "sqlite1.db3");
using (var con = new SQLiteConnection(path))
{
var image= con.Query<Image>("SELECT content FROM Image ;").FirstOrDefault();
if(image!=null)
{
byte[] b = image.Content;
Stream ms = new MemoryStream(b);
image1.Source = ImageSource.FromStream(() => ms);
}
}
}
Model:
public class Image
{
[PrimaryKey, AutoIncrement]
public int Id { get; set; }
public string FileName { get; set; }
public byte[] Content { get; set; }
}
Is there a package that does screen capture in xamarin.forms ?
I need also to capture google maps screen shots
Check out this blog post by Daniel Hindrikes.
I'm going to assume that you use a PCL for your shared code.
You will need to create an interface in your PCL. He calls it IScreenshotManager. The declaration looks like this:
public interface IScreenshotManager
{
Task<byte[]> CaptureAsync();
}
Now all platforms will have their own implementation for it.
For iOS;
public class ScreenshotManager : IScreenshotManager
{
public async System.Threading.Tasks.Task<byte[]> CaptureAsync()
{
var view = UIApplication.SharedApplication.KeyWindow.RootViewController.View;
UIGraphics.BeginImageContext(view.Frame.Size);
view.DrawViewHierarchy(view.Frame, true);
var image = UIGraphics.GetImageFromCurrentImageContext();
UIGraphics.EndImageContext();
using(var imageData = image.AsPNG())
{
var bytes = new byte[imageData.Length];
System.Runtime.InteropServices.Marshal.Copy(imageData.Bytes, bytes, 0, Convert.ToInt32(imageData.Length));
return bytes;
}
}
}
For Android:
public class ScreenshotManager : IScreenshotManager
{
public static Activity Activity { get; set; }
public async System.Threading.Tasks.Task<byte[]> CaptureAsync()
{
if(Activity == null)
{
throw new Exception("You have to set ScreenshotManager.Activity in your Android project");
}
var view = Activity.Window.DecorView;
view.DrawingCacheEnabled = true;
Bitmap bitmap = view.GetDrawingCache(true);
byte[] bitmapData;
using (var stream = new MemoryStream())
{
bitmap.Compress(Bitmap.CompressFormat.Png, 0, stream);
bitmapData = stream.ToArray();
}
return bitmapData;
}
}
And for Windows Phone:
public class ScreenshotManager : IScreenshotManager
{
public async Task<byte[]> CaptureAsync()
{
var rootFrame = Application.Current.RootVisual as PhoneApplicationFrame;
var screenImage = new WriteableBitmap((int)rootFrame.ActualWidth, (int)rootFrame.ActualHeight);
screenImage.Render(rootFrame, new MatrixTransform());
screenImage.Invalidate();
using (var stream = new MemoryStream())
{
screenImage.SaveJpeg(stream, screenImage.PixelWidth, screenImage.PixelHeight, 0, 100);
var bytes = stream.ToArray();
return bytes;
}
}
}
Don't forget to register your platform specific implementations with the attribute which registers it with the Dependency Service, like this:
[assembly: Xamarin.Forms.Dependency (typeof (ScreenshotManager))]
It goes above the namespace declaration.
Now from your shared code you would be able to get the byte[] of a screenshot with a call like this:
var screenshotBytes = DependencyService.Get<IScreenshotManager>().CaptureAsync();
You probably want to check if DependencyService.Get<IScreenshotManager>() isn't null before using it.
After that you can turn your byte[] into an image and do whatever you like with it!
Implementation for UWP
public async Task<byte[]> CaptureAsync()
{
//create and capture Window
var renderTargetBitmap = new RenderTargetBitmap();
await renderTargetBitmap.RenderAsync(Window.Current.Content);
var pixelpuffer = await renderTargetBitmap.GetPixelsAsync();
var logicalDpi = DisplayInformation.GetForCurrentView().LogicalDpi;
IRandomAccessStream stream = new InMemoryRandomAccessStream();
BitmapEncoder encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.PngEncoderId, stream);
encoder.BitmapTransform.InterpolationMode = BitmapInterpolationMode.Fant;
encoder.SetPixelData(BitmapPixelFormat.Bgra8, BitmapAlphaMode.Straight, (uint)renderTargetBitmap.PixelWidth, (uint)renderTargetBitmap.PixelHeight, logicalDpi, logicalDpi, pixelpuffer.ToArray());
await encoder.FlushAsync();
byte[] resultingBuffer = new byte[stream.Size];
await stream.ReadAsync(resultingBuffer.AsBuffer(), (uint)resultingBuffer.Length, InputStreamOptions.None);
return resultingBuffer;
}
I am trying to a read a RSS feed and display in my C# application. i have used the code below and it works perfectly for other RSS feeds. I want to read this RSS feed ---> http://ptwc.weather.gov/ptwc/feeds/ptwc_rss_indian.xml and the code below doesn't work for it. I don't get any errors but nothing happens, the text box which i want the RSS feed to be displayed is empty. Please help. What am I doing wrong?
public class RssNews
{
public string Title;
public string PublicationDate;
public string Description;
}
public class RssReader
{
public static List<RssNews> Read(string url)
{
var webResponse = WebRequest.Create(url).GetResponse();
if (webResponse == null)
return null;
var ds = new DataSet();
ds.ReadXml(webResponse.GetResponseStream());
var news = (from row in ds.Tables["item"].AsEnumerable()
select new RssNews
{
Title = row.Field<string>("title"),
PublicationDate = row.Field<string>("pubDate"),
Description = row.Field<string>("description")
}).ToList();
return news;
}
}
private string covertRss(string url)
{
var s = RssReader.Read(url);
StringBuilder sb = new StringBuilder();
foreach (RssNews rs in s)
{
sb.AppendLine(rs.Title);
sb.AppendLine(rs.PublicationDate);
sb.AppendLine(rs.Description);
}
return sb.ToString();
}
//Form Load code///
string readableRss;
readableRss = covertRss("http://ptwc.weather.gov/ptwc/feeds/ptwc_rss_indian.xml");
textBox5.Text = readableRss;
It seems that the DataSet.ReadXml method fails because there category is specified twice in the item, however under a different namespace.
This seems to work better:
public static List<RssNews> Read(string url)
{
var webClient = new WebClient();
string result = webClient.DownloadString(url);
XDocument document = XDocument.Parse(result);
return (from descendant in document.Descendants("item")
select new RssNews()
{
Description = descendant.Element("description").Value,
Title = descendant.Element("title").Value,
PublicationDate = descendant.Element("pubDate").Value
}).ToList();
}