i can add images without any problem to my website.with my below code..i am using linq and asp.net with c#....
ImageDatabaseDataContext imdb = new ImageDatabaseDataContext();
Dosyalar ds;
Katilimci kt;
protected void btnEkle_Click(object sender, EventArgs e)
{
if (FileUpload1.FileContent != null)
{
string dosyaAdi = Guid.NewGuid().ToString();
byte[] icerik = FileUpload1.FileBytes;
string dosyaTipi = FileUpload1.PostedFile.ContentType;
try
{
ds = new Dosyalar();
kt = new Katilimci();
kt.AdSoyad = txtAdSoyad.Text;
kt.BolgeMudurlugu = txtBolgeMudurlugu.Text;
kt.Gorevi = txtGorev.Text;
kt.NoktaAd = txtNoktaAd.Text;
kt.NoktaTuru = txtNoktaTuru.Text;
imdb.Katilimcis.InsertOnSubmit(kt);
imdb.SubmitChanges();
int idsi = kt.KID;
ds.DosyaAD = dosyaAdi;
ds.DosyaICERIK = icerik;
ds.DosyaTIP = dosyaTipi;
ds.KID = idsi;
imdb.Dosyalars.InsertOnSubmit(ds);
imdb.SubmitChanges();
}
catch (Exception ex)
{
lblHataci.Text = ex.Message;
}
}
}
here is my question..How do i show my images that i was saving on sql server?on asp.Net website with linq queries?
Thanks for your answer...
you can use the solution to this question as long as you get the contents of the image from the database. it doesnt depend on any linq-to-sql.
Dynamically Rendering asp:Image from BLOB entry in ASP.NET
`public class ImageHandler : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
using(Image image = GetImage(context.Request.QueryString["ID"]))
{
context.Response.ContentType = "image/jpeg";
image.Save(context.Response.OutputStream, ImageFormat.Jpeg);
}
}
public bool IsReusable
{
get
{
return true;
}
}
}`
this code solves my question thank you.
Related
If I have an element like this in a Windows Store or Windows Phone application:
<Image Source="{Binding UrlToWebServer}" />
the image is cached locally. This is great. But how do I remove all cached images on disc from code?
You just have to set the imagesource to NULL
Something like this:
BitmapImage bitmapImage = myimage.Source as BitmapImage;
bitmapImage.UriSource = null;
myimage.Source = null;
This works for me. Here you can find mor infos handling images (section Image Caching for example).
Hi it´s a little bit late to answer this question but you can use this class to delete the cache of a specific files or all if you want
this is the class helper
class CacheCleanup : IDisposable
{
private DispatcherTimer cleanCacheTimer;
public CacheCleanup(TimeSpan? cleanInterval = null)
{
if (!cleanInterval.HasValue)
cleanInterval = TimeSpan.FromMinutes(0.2);
cleanCacheTimer = new DispatcherTimer();
cleanCacheTimer.Interval = cleanInterval.Value;
cleanCacheTimer.Tick += CleanCacheTimer_Tick;
cleanCacheTimer.Start();
}
private void CleanCacheTimer_Tick(object sender, object e)
{
try
{
StorageFolder localDirectory = ApplicationData.Current.LocalFolder;
string[] tmpCacheDirectories = Directory.GetDirectories(localDirectory.Path + "\\..\\ac\\inetcache");
foreach (string dir in tmpCacheDirectories)
{
string[] tmpCacheFilesPng = Directory.GetFiles(dir, "*.png");
foreach (string file in tmpCacheFilesPng)
{
try
{
File.Delete(file);
Debug.WriteLine("Deleted png: " + file);
}
catch (Exception) { }
}
string[] tmpCacheFilesJpg = Directory.GetFiles(dir, "*.jpg");
foreach (string file in tmpCacheFilesJpg)
{
try
{
File.Delete(file);
Debug.WriteLine("Deleted jpg: " + file);
}
catch (Exception) { }
}
}
}
catch (Exception ex) { Debug.WriteLine("ERROR CLEANING CACHE: " + ex.Message); }
}
public void Dispose()
{
if (cleanCacheTimer != null)
{
cleanCacheTimer.Stop();
cleanCacheTimer = null;
}
}
}
and this is the way how you can call this class in some part of your c# code
CacheCleanup cacheCleanup = new CacheCleanup();
Im developing a small Tcp Client Socket application in windows phone. Actually i have a text box, in that whatever the data received from a TCP server, should update continuously in UI text box control.
while (val)
{
result = Receive();
Dispatcher.BeginInvoke((Action)(() =>
{
txtOutput.Text += result;
}));
}
Here in above code, method receive() will receive string data and should update in textbox control but it is not happening,no data is updating to it.
Can any one suggest, how can i resolve this.
Just telling you what i have been advised, "avoid Dispatcher, CoreDispatcher, etc. There are always better solutions."
Below is the piece of code worked for me for both wp8 and wp8.1 WinRT app,
IProgress<object> progress = new Progress<object>(_ => UpdateTicker());
Task.Run(async () =>
{
while (val)
{
progress.Report(null);
}
});
where UpdateTicker() method contains your instructions, in this case...
public void UpdateTicker()
{
result = Receive();
txtOutput.Text += result;
}
Hope this helps...
Thanks for everyone, who given a valuable response for my post.
Hi Nishchith,
I tried your code, but it dint works for me
Here is my logic used to update textbox continuously with data received from TCP server.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Navigation;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Shell;
using PhoneApp3.Resources;
using System.Net.Sockets;
using System.Threading;
using System.Text;
using Windows.Phone.Networking;
using System.Threading.Tasks;
namespace PhoneApp3
{
public partial class MainPage : PhoneApplicationPage
{
Socket _socket = null;
static ManualResetEvent _clientDone = new ManualResetEvent(false);
const int TIMEOUT_MILLISECONDS = 1000;
const int MAX_BUFFER_SIZE = 2048;
const int ECHO_PORT = 9055; // The Echo protocol uses port 7 in this sample
const int QOTD_PORT = 49152; // The Quote of the Day (QOTD) protocol uses port 17 in this sample
string result = string.Empty;
public MainPage()
{
InitializeComponent();
}
private void btnEcho_Click(object sender, RoutedEventArgs e)
{
SocketClient client = new SocketClient();
Connect(txtRemoteHost.Text, ECHO_PORT);
//close();
}
public void Connect(string hostName, int portNumber)
{
DnsEndPoint hostEntry = new DnsEndPoint(hostName, portNumber);
_socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
SocketAsyncEventArgs socketEventArg = new SocketAsyncEventArgs();
socketEventArg.RemoteEndPoint = hostEntry;
socketEventArg.Completed += new EventHandler<SocketAsyncEventArgs>(delegate(object s, SocketAsyncEventArgs e)
{
result = e.SocketError.ToString();
_clientDone.Set();
});
_clientDone.Reset();
Thread.Sleep(2000);
_socket.ConnectAsync(socketEventArg);
Thread.Sleep(5000);
_clientDone.WaitOne(TIMEOUT_MILLISECONDS);
bool val;
if (result == "Success")
{
val = true;
}
else
{
val = false;
}
IProgress<object> progress = new Progress<object>(_ => UpdateTicker());
Task.Run(async () =>
{
while (val)
{
progress.Report(null);
}
});
}
public void UpdateTicker()
{
result = Receive();
string[] strsplit = result.Split(' ');
txtOutput.Text = strsplit[1];
}
public string Receive()
{
string response = "Operation Timeout";
if (_socket != null)
{
SocketAsyncEventArgs socketEventArg = new SocketAsyncEventArgs();
socketEventArg.RemoteEndPoint = _socket.RemoteEndPoint;
socketEventArg.SetBuffer(new Byte[MAX_BUFFER_SIZE], 0, MAX_BUFFER_SIZE);
socketEventArg.Completed += new EventHandler<SocketAsyncEventArgs>(delegate(object s, SocketAsyncEventArgs e)
{
if (e.SocketError == SocketError.Success)
{
// Retrieve the data from the buffer
response = Encoding.UTF8.GetString(e.Buffer, e.Offset, e.BytesTransferred);
response = response.Trim('\0');
}
else
{
response = e.SocketError.ToString();
}
_clientDone.Set();
});
_clientDone.Reset();
Thread.Sleep(1000);
_socket.ReceiveAsync(socketEventArg);
Thread.Sleep(1000);
_clientDone.WaitOne(TIMEOUT_MILLISECONDS);
}
else
{
response = "Socket is not initialized";
}
return response;
}
public void Close()
{
if (_socket != null)
{
_socket.Close();
}
}
}
}
I have a list wich is loaded with elements each time the user make a research...These elements contain an Icon which is dowloaded with an async method GetByteArrayAsync of the HttpClient object. I have an issue when the user make a second research while the icon of the first list are still downloading.Because the list of elements is changing while Icon downloads are processing on each element of the first list. So my guess is that I need to cancel these requests each time the user proceed to a new research...Ive readen some stuuf on Task.run and CancellationTokenSource but I can't find really helpful example for my case so here is my code...Hope you can help me with that ...Thank you
public static async Task<byte[]> DownloadElementFile(BdeskElement bdeskElement)
{
//create and send the request
DataRequest requesteur = new DataRequest();
byte[] encryptedByte = await requesteur.GetBytesAsync(dataRequestParam);
return encryptedByte;
}
public async Task<Byte[]> GetBytesAsync(DataRequestParam datarequesparam)
{
var handler = new HttpClientHandler { Credentials = new NetworkCredential(datarequesparam.AuthentificationLogin, datarequesparam.AuthentificationPassword, "bt0d0000") };
HttpClient httpClient = new HttpClient(handler);
try
{
byte[] BytesReceived = await httpClient.GetByteArrayAsync(datarequesparam.TargetUri);
if (BytesReceived.Length > 0)
{
return BytesReceived;
}
else
{
return null;
}
}
catch (WebException)
{
throw new MyException(MyExceptionsMessages.Webexception);
}
}
EDIT
public async Task<Byte[]> GetBytesAsync(DataRequestParam datarequesparam)
{
var handler = new HttpClientHandler { Credentials = new NetworkCredential(datarequesparam.AuthentificationLogin, datarequesparam.AuthentificationPassword, "bt0d0000") };
HttpClient httpClient = new HttpClient(handler);
try
{
cts = new CancellationTokenSource();
HttpResponseMessage reponse = await httpClient.GetAsync(datarequesparam.TargetUri,cts.Token);
if (reponse.StatusCode == HttpStatusCode.OK)
{
byte[] BytesReceived = reponse.Content.ReadAsByteArrayAsync().Result;
if (BytesReceived.Length > 0)
{
return BytesReceived;
}
else
{
return null;
}
}
else
{
return null;
}
}
catch (WebException)
{
throw new MyException(MyExceptionsMessages.Webexception);
}
catch(OperationCanceledException)
{
throw new OperationCanceledException();
}
EDIT2
I need to cancel this funntion when the user make a new research and the list "listBoxGetDocsLibs" changed.
private async void LoadIconDocLibs()
{
foreach (var doclib in listBoxGetDocsLibs)//ERROR HERE COLLECTION HAS CHANGED
{
doclib.Icon = new BitmapImage();
try
{
byte[] Icon = await ServerFunctions.GetDocLibsIcon(doclib);
if (Icon != null)
{
{
var ms = new MemoryStream(Icon);
BitmapImage photo = new BitmapImage();
photo.DecodePixelHeight = 64;
photo.DecodePixelWidth = 92;
photo.SetSource(ms);
doclib.Icon = photo;
}
}
}
catch(OperationCanceledException)
{
}
}
}
First you need to define CancellationTokenSource:
private System.Threading.CancellationTokenSource cts;
place above code somewhere, where you can access it with your Button or other method.
Unfortunately GetByteArrayAsync lacks Cancelling - so it cannot be used with cts.Token, but maybe you can accomplish your task using GetAsync - which supports Cancelling:
ctsDownload = new System.Threading.CancellationTokenSource();
HttpResponseMessage response = await httpClient.GetAsync(requestUri, cts.Token);
Then you can get your content from response.
And when you want to Cancel your Task it can look like this:
private void cancelBtn_Click(object sender, RoutedEventArgs e)
{
if (this.cts != null)
this.cts.Cancel();
}
When you Cancel task an Exception will be thrown.
If you want to cancel your own async Task, a good example you can find at Stephen Cleary blog.
EDIT - you can also build your own method (for example with HttpWebRequest) which will support Cancelling:
For this purpose you will have to extend HttpWebRequest (under WP it lacks GetResponseAsync):
// create a static class in your namespace
public static class Extensions
{
public static Task<HttpWebResponse> GetResponseAsync(this HttpWebRequest webRequest)
{
TaskCompletionSource<HttpWebResponse> taskComplete = new TaskCompletionSource<HttpWebResponse>();
webRequest.BeginGetResponse(
asyncResponse =>
{
try
{
HttpWebRequest responseRequest = (HttpWebRequest)asyncResponse.AsyncState;
HttpWebResponse someResponse = (HttpWebResponse)responseRequest.EndGetResponse(asyncResponse);
taskComplete.TrySetResult(someResponse);
}
catch (WebException webExc)
{
HttpWebResponse failedResponse = (HttpWebResponse)webExc.Response;
taskComplete.TrySetResult(failedResponse);
}
catch (Exception exc) { taskComplete.SetException(exc); }
}, webRequest);
return taskComplete.Task;
}
}
Then your method can look like this:
public async Task<Byte[]> GetBytesAsync(DataRequestParam datarequesparam, CancellationToken ct)
{
HttpWebRequest request = HttpWebRequest.CreateHttp(datarequesparam.TargetUri);
request.Method = "GET";
request.Credentials = new NetworkCredential(datarequesparam.AuthentificationLogin, datarequesparam.AuthentificationPassword, "bt0d0000");
request.AllowReadStreamBuffering = false;
try
{
if (request != null)
{
using (HttpWebResponse response = await request.GetResponseAsync())
using (Stream mystr = response.GetResponseStream())
using (MemoryStream output = new MemoryStream())
{
const int BUFFER_SIZE = 10 * 1024;
byte[] buf = new byte[BUFFER_SIZE];
int bytesread = 0;
while ((bytesread = await mystr.ReadAsync(buf, 0, BUFFER_SIZE)) > 0)
{
output.Write(buf, 0, bytesread);
ct.ThrowIfCancellationRequested();
}
return output.ToArray();
}
}
else return null;
}
catch (WebException)
{
throw new MyException(MyExceptionsMessages.Webexception);
}
}
You can freely change Buffer Size which will affect how often Cancellation will be checked.
I haven't tried this but I think it should work.
I'm new to WP7 app development and I'm having trouble passing parameters to an API on a website.
It's my understanding that the onNavigatedTo() is fired first when a page is open on the WP7, however when I try to grab the parameters the webClient_DownloadStringCompleted() is fired first.
public partial class Ranks : PhoneApplicationPage
{
private WebClient webClient;
private string pageType;
private string pagePosition;
public Ranks()
{
InitializeComponent();
this.webClient = new WebClient();
string header_auth = "application/json";
this.webClient.DownloadStringCompleted += new DownloadStringCompletedEventHandler(webClient_DownloadStringCompleted);
this.webClient.Headers[HttpRequestHeader.Authorization] = header_auth;
Uri serviceUri = new Uri(#"http://www.example.com/api/API.php?type=" + pageType + "&position=" + pagePosition);
this.webClient.DownloadStringAsync(serviceUri);
}
protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
{
string type, position;
if (NavigationContext.QueryString.TryGetValue("type", out type))
{
pageType = type;
}
if (NavigationContext.QueryString.TryGetValue("pos", out position))
{
pagePosition = position;
}
}
void webClient_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
{
string myJsonString = e.Result;
List<PlayerDetails> dataSource = new List<PlayerDetails>();
//load into memory stream
using (var ms = new MemoryStream(Encoding.Unicode.GetBytes(myJsonString)))
{
//parse into jsonser
var ser = new DataContractJsonSerializer(typeof(PlayerDetails[]));
PlayerDetails[] obj = (PlayerDetails[])ser.ReadObject(ms);
foreach (PlayerDetails plyr in obj)
{
dataSource.Add(plyr);
}
playerList.ItemsSource = dataSource;
}
}
Whenever the URI string is built it's missing the parameters 'pageType' and 'pagePosition'
Any help would be greatly appreciated!
The class constructor will always get called before OnNavigatedTo. you should move that code from the constructor, and into OnNavigatedTo (or Loaded).
I'm guessing that you have that code in the constructor because you only want it to happen once per page load (i.e. not when the user navigates Back onto the page). If that's the case, you can check the NavigationMode.
protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
{
if (e.NavigationMode == NavigationMode.New)
{
string type, position;
if (NavigationContext.QueryString.TryGetValue("type", out type))
{
pageType = type;
}
if (NavigationContext.QueryString.TryGetValue("pos", out position))
{
pagePosition = position;
}
this.webClient = new WebClient();
string header_auth = "application/json";
this.webClient.DownloadStringCompleted += new DownloadStringCompletedEventHandler(webClient_DownloadStringCompleted);
this.webClient.Headers[HttpRequestHeader.Authorization] = header_auth;
Uri serviceUri = new Uri(#"http://www.example.com/api/API.php?type=" + pageType + "&position=" + pagePosition);
this.webClient.DownloadStringAsync(serviceUri);
}
}
I am trying to post some data to our webservice(written in c#) and get the response. The response is in JSON format.
I am using the Blackberry Code Sample which is BlockingSenderDestination Sample. When I request a page it returns with no problem. But when I send my data to our webservice it does not return anything.
The code part that I added is :
ByteMessage myMsg = bsd.createByteMessage();
//myMsg.setStringPayload("I love my BlackBerry device!");
myMsg.setMessageProperty("querytpe","myspecialkey");//here is my post data
myMsg.setMessageProperty("uname","myusername");
myMsg.setMessageProperty("pass","password");
((HttpMessage) myMsg).setMethod(HttpMessage.POST);
// Send message and wait for response myMsg
response = bsd.sendReceive(myMsg);
What am i doing wrong? And what is the alternatives or more efficients way to do Post with Blackberry.
Regards.
Here is my whole code:
class BlockingSenderSample extends MainScreen implements FieldChangeListener {
ButtonField _btnBlock = new ButtonField(Field.FIELD_HCENTER);
private static UiApplication _app = UiApplication.getUiApplication();
private String _result;
public BlockingSenderSample()
{
_btnBlock.setChangeListener(this);
_btnBlock.setLabel("Fetch page");
add(_btnBlock);
}
public void fieldChanged(Field button, int unused)
{
if(button == _btnBlock)
{
Thread t = new Thread(new Runnable()
{
public void run()
{
Message response = null;
String uriStr = "http://192.168.1.250/mobileServiceOrjinal.aspx"; //our webservice address
//String uriStr = "http://www.blackberry.com";
BlockingSenderDestination bsd = null;
try
{
bsd = (BlockingSenderDestination)
DestinationFactory.getSenderDestination
("name", URI.create(uriStr));//name for context is name. is it true?
if(bsd == null)
{
bsd =
DestinationFactory.createBlockingSenderDestination
(new Context("ender"),
URI.create(uriStr)
);
}
//Dialog.inform( "1" );
ByteMessage myMsg = bsd.createByteMessage();
//myMsg.setStringPayload("I love my BlackBerry device!");
myMsg.setMessageProperty("querytpe","myspecialkey");//here is my post data
myMsg.setMessageProperty("uname","myusername");
myMsg.setMessageProperty("pass","password");
((HttpMessage) myMsg).setMethod(HttpMessage.POST);
// Send message and wait for response myMsg
response = bsd.sendReceive(myMsg);
if(response != null)
{
BSDResponse(response);
}
}
catch(Exception e)
{
//Dialog.inform( "ex" );
// process the error
}
finally
{
if(bsd != null)
{
bsd.release();
}
}
}
});
t.start();
}
}
private void BSDResponse(Message msg)
{
if (msg instanceof ByteMessage)
{
ByteMessage reply = (ByteMessage) msg;
_result = (String) reply.getStringPayload();
} else if(msg instanceof StreamMessage)
{
StreamMessage reply = (StreamMessage) msg;
InputStream is = reply.getStreamPayload();
byte[] data = null;
try {
data = net.rim.device.api.io.IOUtilities.streamToBytes(is);
} catch (IOException e) {
// process the error
}
if(data != null)
{
_result = new String(data);
}
}
_app.invokeLater(new Runnable() {
public void run() {
_app.pushScreen(new HTTPOutputScreen(_result));
}
});
}
}
..
class HTTPOutputScreen extends MainScreen
{
RichTextField _rtfOutput = new RichTextField();
public HTTPOutputScreen(String message)
{
_rtfOutput.setText("Retrieving data. Please wait...");
add(_rtfOutput);
showContents(message);
}
// After the data has been retrieved, display it
public void showContents(final String result)
{
UiApplication.getUiApplication().invokeLater(new Runnable()
{
public void run()
{
_rtfOutput.setText(result);
}
});
}
}
HttpMessage does not extend ByteMessage so when you do:
((HttpMessage) myMsg).setMethod(HttpMessage.POST);
it throws a ClassCastException. Here's a rough outline of what I would do instead. Note that this is just example code, I'm ignoring exceptions and such.
//Note: the URL will need to be appended with appropriate connection settings
HttpConnection httpConn = (HttpConnection) Connector.open(url);
httpConn.setRequestMethod(HttpConnection.POST);
OutputStream out = httpConn.openOutputStream();
out.write(<YOUR DATA HERE>);
out.flush();
out.close();
InputStream in = httpConn.openInputStream();
//Read in the input stream if you want to get the response from the server
if(httpConn.getResponseCode() != HttpConnection.OK)
{
//Do error handling here.
}