Here is my situation,
I have an ESRI Map Silverlight application that needs to display ShapeFiles that were given to me the client.
The only third party library I've found that will allow you to do this is the ESRI Silverlight API Contrib. The example they give is to use an Open File Dialog to select the shape files and to load them into a FileInfo classes to show. (See example on site's frontpage).
However I run into the issue that since it is a Silverlight app, any attempt to instantiate an instance of a FileInfo object causes the app to crash.
So my question is, is there a way for me to load/display shape files that I have saved locally to the app in Silverlight?
Please let me know if you need me to give more info.
Thanks in advance!
Code:
FileInfo runwayShp = new FileInfo("Layers\\Runway.shp"); //This line breaks, says file access is denied.
FileInfo runwayDbf = new FileInfo("Layers\\Runway.dbf");
ShapeFile shapeFileReader = new ShapeFile();
if (runwayShp != null && runwayDbf != null)
{
shapeFileReader.Read(runwayShp, runwayDbf);
}
GraphicsLayer graphicsLayer = MyMap.Layers["ShapeLayer"] as GraphicsLayer;
foreach (ShapeFileRecord record in shapeFileReader.Records)
{
Graphic graphic = record.ToGraphic();
if (graphic != null)
graphicsLayer.Graphics.Add(graphic);
}
}
I have a silveright app that is doing pretty much the same thing, but what I am doing is uploading the shapefile as a blob to a SQL db on the back end, and then grabbing it from there.
for what you are trying to do, you should look at this codeplex project. I think it will help you out.
Related
So, the title may be misleading. I am building an android app that reads information from a text file, which is located on a cloud server (I would prefer to use either OneDrive, DropBox, or Google Drive [whichever is easiest]; others are fine). Periodically, the program will write information to the text file, still located on the cloud server. So, my question is twofold: Is it possible to read and write to a text file that is located on a cloud server? If so, how in the world would I complete this task? I have noticed the use of WebClient but I can't find a reasonable method or explanation on how this works. This program is coded in C#. This is what I have so far:
private string filename = "datafile.txt";
private List<Category> myList; //A list of an object that I developed ('Category')
//Allow the user interface to handle the error
public void readDatabase() {
//Here is where the magic has to occur, in order to read the file
...
//The usual reader that I use to read standard text files
StreamReader fileReader = new StreamReader(filename);
string line = "";
while ((line = fileReader.ReadLine()) != null)
//convertToCategory is my private method to convert the string to
myLine.Add(convertToCategory(line);
fileReader.close();
}
public void writeDatabase() {
//Here is where the magic has to occur, in order to write to the file
...
//The usual writer that I use to write standard text files
StreamWriter fileWriter = new StreamWriter(filename);
for (int i = 0; i < this.myList.Count; i++)
//toString() is something was developed in my object called 'Category'
fileWriter.WriteLine(fileWriter[i].toString());
fileWriter.close();
}
I would love to use Google Drive as my cloud server, but I am open to other possibilities, if necessary. I just want an easy and efficient method to read/write to the text file.
Possible Implementations:
Have seen possible solutions, where the file is downloaded locally and then read like normal and then uploaded at time of closing. However, if I could get away with it, I don't want the text file to be downloaded.
I have, also, seen several places where a SQL database is used in this instance. But the unfortunate thing is that I don't have any knowledge in developing with SQL. So, using a SQL server would be ideal (because speed is very important for this application) but it will be difficult for me to understand how it works.
I have an issue with a class library; I am preparing a library with an interface that represents a specific data storage signature. The purpose is to use the interface as a basis for implementing a number of specific classes storing configuration information in different formats (text files, xml files, etc.) while retaining the same usage profile to the application using it. I have a problem, though. In this case I am trying to embed an xml file as a resource - this file is one type of format to store configuration data. The file is located as an embedded resource in a subfolder to the project, as shown in the attached illustration.
In the following code snippet it is shown how I have implemented the functionality until now.
public ConfigInfoXmlSource()
{
if (!string.IsNullOrEmpty(Settings.Default.CurrentConfigFile))
FileNameAndPath = Settings.Default.CurrentConfigFile;
else
FileNameAndPath = DefaultConfigFileName + DefaultFileExtension;
// Prepare XML.
System.Reflection.Assembly a = Assembly.GetExecutingAssembly();
XmlDocument doc = new XmlDocument();
Stream manifestResourceStream =
a.GetManifestResourceStream("TestTool.Config.Config1.xml");
if (manifestResourceStream == null)
{
// ???
}
...
doc.Load(manifestResourceStream);
...
}
In the section marked "Prepare XML" I am trying to read a stream from the embedded resource. After the reading, it is tested whether a stream was indeed created. If the file is found, the manifestResourceStream will contain the xml data - so far so good. The problem arises if the file for some reason has been accidentally deleted - in that case I want to create a new file as an embedded resource to replace the deleted file. That is supposed to happen in the conditional in the part shown as "???".
I have tried everything I could think of, searched Google for answers, etc. - to no avail.
Does anyone have a clue to how this is accomplished? Any help will be greatly appreciated.
Thanks in advance.
Best regards.
If you have a embedded resource,it is built into your binaries.It is not an physical file,rather something which is present inside the built file(dll in this case).So,once it is included,I do not think it can ever be deleted. As per my knowledge embedded resource can only be set while building your project binaries and you can not explicitly do it at runtime as it is not needed due to reasons mentioned above.
I'm writing a VOD solution. For some time I have been working with the SSME:SmoothStreamingMediaElement successfully for testing and now I would like to utilise one of the Expression Players.
I'm using Azure Media Services, specifically Smooth Streaming. While these work fine in SSME I can't get them to work with an ExpressionPlayer. I don't know why.
I'm now at a point where I'm hard coding a Uri to try and get this to work as below:
void dataConectorPopulatePlaylistDownloadComplete(MemoryStream returnData, EventArgs e)
{
<snip>
var myPlaylist = new ExpressionMediaPlayer.Playlist();
var playlistItem = new PlaylistItem();
playlistItem.MediaSource = new Uri("http://xxxxxms1.origin.mediaservices.windows.net/b78750fc-9e2f-448c-86e3-d5de084791ea/GOPR0009.MP4-b2d2b578-3560-42c6-9927-2a791f395e19.ism/manifest",UriKind.Absolute);
playlistItem.IsAdaptiveStreaming = true;
myPlaylist.Items.Add(playlistItem);
SmoothPlayerStreaming.Playlist = myPlaylist;
<snip>
}
Using the above returns 404 not found in the player video playback window.
This is a valid URL and a valid Smooth Streaming Uri. Using this exact same Uri in a SSME control works fine.
What have I done wrong?
The ExpressionMediaPlayer class makes a hidden call to the ClientBin/SmoothStreaming.xap file. If you don't have it there - you should add it.
Here is the link to the blog post where you can download the xap file and source code of the expression player. Direct link
After you download the archive above, you can find this file at this path: EE4SP1SilverlightDefaultWithAudioVolume.zip\Templates\Silverlight Default -- with Audio Volume On Start\SmoothStreaming.xap
If it still doesn't work, you should replace the MediaPlayer.dll by projects from the archive. You need to add (Add -> Existing Project) 3 projects from the SharedV4SP1 folder: MediaPlayer, OfflineShared, PlugInMSSCtrl.
I've already tested your code in my application and it started to work after I have copied the xap file and replaced the dll-reference by existing projects.
I bought a website template that has a scrolling photo gallery. As it came, the images are static in the fla file itself. I would like to edit the fla and load images dynamically. Ideally from MSSQL. I'm using VS2010, C# webforms, and SQL Server 2008 R2.
Are there any code snippets or tutorials or general guidance on how to do this? I do have a CS3 disc with Flash on it I can use for editing.
You can use a Loader + URLRequest, something like: (untested code)
var imgLoader:Loader = new Loader();
imgLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, imageHasBeenLoaded);
imgLoader.load(new URLRequest("imagePath/from/database.jpg"));
public function imageHasBeenLoaded(e:Event) {
//Get the loaded bitmap image, do what you want with it from here.
var img:Bitmap = Bitmap(e.target.content);
}
Of course you would also want to feed the file paths to flash, either by FlashVars or by hitting a web service type of page (or xml file) via a Flash URLLoader + URLRequest. I prefer an xml file myself.
I have a text file with a list of 300,000 words and the frequency with wich they occur. Each line is in the format Word:FequencyOfOccurence.
I want this information to be accessible from within the C# code. I can't hard code the list since it is too long, and I'm not sure how to go about accessing it from a file on the server. Ideally I'd ideally like the information to be downloaded only if it's used (To save on bandwidth) but this is not a high priority as the file is not too big and internet speeds are always increasing.
It doesn't need to be useable for binding.
The information does not need to be editable once the project has been built.
Here is another alternative. Zip the file up and stick it in the clientBin folder next to the apllication XAP. Then at the point in the app where the content is needed do something like this:-
public void GetWordFrequencyResource(Action<string> callback)
{
WebClient client = new WebClient();
client.OpenReadAsync += (s, args) =>
{
try
{
var zipRes = new StreamResourceInfo(args.Result, null)
var txtRes = Application.GetResourceStream(zipRes, new Uri("WordFrequency.txt", UriKind.Relative));
string result = new StreamReader(txtRes.Stream).ReadToEnd();
callback(result);
}
catch
{
callback(null); //Fetch failed.
}
}
client.OpenReadAsync(new Uri("WordFrequency.zip", UriKind.Relative"));
}
Usage:-
var wordFrequency = new Dictionary<string, int>();
GetWordFrequencyResource(s =>
{
// Code here to burst string into dictionary.
});
// Note code here is asynchronous with the building of the dictionary don't attempt to
// use the dictionary here.
The above code allows you to store the file in an efficient zip format but not in the XAP itself. Hence you can download it on demand. It makes use of the fact that a XAP is a zip file so Application.GetResourceStream which is designed to pull resources from XAP files can be used on a zip file.
BTW, I'm not actually suggesting you use a dictionary, I'm just using a dictionary as simple example. In reality I would imagine the file is in sorted order. If that is the case you could use a KeyValuePair<string, int> for each entry but create a custom collection type that holds them in an array or List and then use some Binary search methods to index into it.
Based on your comments, you could download the word list file if you are required to have a very thin server layer. The XAP file containing your Silverlight application is nothing more than a ZIP file with all the referenced files for your Silverlight client layer. Try adding the word list as content that gets compiled into the XAP and see how big the file gets. Text usually compresses really well. In general, though, you'll want to be friendly with your users in how much memory your application consumes. Loading a huge text file into memory, in addition to everything else you need in your app, may untimately make your app a resource hog.
A better practice, in general, would be to call a web service. The service could would perform whatever look up logic you need. Here's a blog post from a quick search that should get you started: (This was written for SL2, but should apply the same for SL3.)
Calling web services with Silverlight 2
Even better would be to store your list in a SQL Server. It will be much easier and quicker to query.
You could create a WCF service on the server side that will send the data to the Silverlight application. Once you retrieve the information you could cache it in-memory inside the client. Here's an example of calling a WCF service method from Silverlight.
Another possibility is to embed the text file into the Silverlight assembly that is deployed to the client:
using (var stream = Assembly.GetExecutingAssembly()
.GetManifestResourceStream("namespace.data.txt"))
using (var reader = new StreamReader(stream))
{
string data = reader.ReadToEnd();
// Do something with the data
}