Below code specifies that we we can make http connection in blackberry and how to store html page as a string?
I am doing this but I am able to get that http request but when I get response i.e http_ok it is not correct so that I can save text oh html as a string and I can further store that into sqlite.
LabelField title = new LabelField("SQLite Create Database Sample",
LabelField.ELLIPSIS |
LabelField.USE_ALL_WIDTH);
setTitle(title);
add(new RichTextField("Creating a database."));
argURL="https://www.google.com:80";
try {
connDesc = connFact.getConnection(argURL);
if (connDesc != null) {
httpConn = (HttpConnection) connDesc.getConnection();
// //Send Data on this connection
// httpConn.setRequestMethod(HttpConnection.GET);
// //Server Response
StringBuffer strBuffer = new StringBuffer();
inStream = httpConn.openInputStream();
int chr;
int retResponseCode = httpConn.getResponseCode();
if (retResponseCode == HttpConnection.HTTP_OK) {
if (inStream != null) {
while ((chr = inStream.read()) != -1) {
strBuffer.append((char) chr);
}
serverResponceStr = strBuffer.toString();
// appLe.alertForms.get_userWaitAlertForm().append("\n"+serverResponceStr);
//returnCode = gprsConstants.retCodeSuccess;
}
} else {
//returnCode = gprsConstants.retCodeNOK;
}
}
} catch (Exception excp) {
//returnCode = gprsConstants.retCodeDisconn;
excp.printStackTrace();
} `enter code here`
The code does not perform any database functionality, however I tested and it does successfully perform an HttpRequest to an external URL. The data that comes back is based on the response of the server you are making the request to.
The code I used can be found here:
http://snipt.org/vrl7
The only modifications is to keep a running summary of various events, and the response is displayed in the RichTextField. Basically, this looks to be working as intended, and the resulting String should be able to be saved however you see fit; though you may need to be cautious of encoding when saving to a database so that special characters are not lost or misinterpreted.
Related
I m using Given below code to post the tweet on twitter. But when we upload it on the server then special character (!,:,$ etc) tweets not published on twitter. this code is working fine in the local system
string key = "";
string secret = "";
string token="";
string tokenSecret="";
try
{
string localFilename = HttpContext.Current.Server.MapPath("../images/").ToString();
using (WebClient client = new WebClient())
{
client.DownloadFile(imagePath, localFilename);
}
var service = new TweetSharp.TwitterService(key, secret);
service.AuthenticateWith(token, tokenSecret);
// Tweet wtih image
if (imagePath.Length > 0)
{
using (var stream = new FileStream(localFilename, FileMode.Open))
{
var result = service.SendTweetWithMedia(new SendTweetWithMediaOptions
{
Status = message,
Images = new Dictionary<string, Stream> { { "name", stream } }
});
}
}
else // just message
{
var result = service.SendTweet(new SendTweetOptions
{
Status = HttpUtility.UrlEncode(message)
});
}
}
catch (Exception ex)
{
throw ex;
}
The statuses/update_with_media API endpoint is actually deprecated by Twitter and shouldn't be used (https://dev.twitter.com/rest/reference/post/statuses/update_with_media).
TweetSharp also has some issues with using this method when the tweet contains both a 'special character' AND an image (works fine with either, but not both). I don't know why and I haven't been able to fix it, it's something to do with the OAuth signature I'm pretty sure.
As a solution I suggest you use TweetMoaSharp (a fork of TweetSharp). It has been updated to support the new Twitter API's for handling media in tweets, and it will work in this situation if you use the new stuff.
Basically you upload each media item using a new UploadMedia method, and that will return you a 'media id'. You then use the normal 'SendTweet' method and provide a list of the media ids to it along with the other status details. Twitter will attach the media to the tweet when it is posted, and it will work when there are both special characters and images.
In addition to TweetMoaSharp you can use Tweetinvi with the following code:
var binary = File.ReadAllBytes(#"C:\videos\image.jpg");
var media = Upload.UploadMedia(binary);
var tweet = Tweet.PublishTweet("hello", new PublishTweetOptionalParameters
{
Medias = {media}
});
I want to create an application wide feed on my ASP.net 3.5 web site using the application cache. The data that I am using to populate the cache is slow to obtain, maybe up to 10 seconds (from a remote server's data feed). My question/confusion is, what is the best way to structure the cache management.
private const string CacheKey = "MyCachedString";
private static string lockString = "";
public string GetCachedString()
{
string data = (string)Cache[CacheKey];
string newData = "";
if (data == null)
{
// A - Should this method call go here?
newData = SlowResourceMethod();
lock (lockString)
{
data = (string)Cache[CacheKey];
if (data != null)
{
return data;
}
// B - Or here, within the lock?
newData = SlowResourceMethod();
Cache[CacheKey] = data = newData;
}
}
return data;
}
The actual method would be presented by and HttpHandler (.ashx).
If I collect the data at point 'A', I keep the lock time short, but might end up calling the external resource many times (from web pages all trying to reference the feed). If I put it at point 'B', the lock time will be long, which I am assuming is a bad thing.
What is the best approach, or is there a better pattern that I could use?
Any advice would be appreciated.
I add the comments on the code.
private const string CacheKey = "MyCachedString";
private static readonly object syncLock = new object();
public string GetCachedString()
{
string data = (string)Cache[CacheKey];
string newData = "";
// start to check if you have it on cache
if (data == null)
{
// A - Should this method call go here?
// absolut not here
// newData = SlowResourceMethod();
// we are now here and wait for someone else to make it or not
lock (syncLock)
{
// now lets see if some one else make it...
data = (string)Cache[CacheKey];
// we have it, send it
if (data != null)
{
return data;
}
// not have it, now is the time to look for it.
// B - Or here, within the lock?
newData = SlowResourceMethod();
// set it on cache
Cache[CacheKey] = data = newData;
}
}
return data;
}
Better for me is to use mutex and lock depended on the name CacheKey and not lock all resource and the non relative one. With mutex one basic simple example will be:
private const string CacheKey = "MyCachedString";
public string GetCachedString()
{
string data = (string)Cache[CacheKey];
string newData = "";
// start to check if you have it on cache
if (data == null)
{
// lock it base on resource key
// (note that not all chars are valid for name)
var mut = new Mutex(true, CacheKey);
try
{
// Wait until it is safe to enter.
// but also add 30 seconds max
mut.WaitOne(30000);
// now lets see if some one else make it...
data = (string)Cache[CacheKey];
// we have it, send it
if (data != null)
{
return data;
}
// not have it, now is the time to look for it.
// B - Or here, within the lock?
newData = SlowResourceMethod();
// set it on cache
Cache[CacheKey] = data = newData;
}
finally
{
// Release the Mutex.
mut.ReleaseMutex();
}
}
return data;
}
You can also read
Image caching issue by using files in ASP.NET
I'm looking for a code example that demonstrates practical real-world usage of the Storage interface. I'm especially interested in HTML5 implementation. I've just started working on my own proof-of-concept, so I'll post that if no better answers arrive before then.
The Storage interface is introduced in this Google presentation here:
http://playn-2011.appspot.com/
Here's some code that demonstrates the use of the storage interface together with PlayN's JSON interface:
private void loadStoredData() {
// storage parameters
String storageKey = "jsonData";
Json.Object jsonData = PlayN.json().createObject();
// to reset storage, uncomment this line
//PlayN.storage().removeItem(storageKey);
// attempt to load stored data
String jsonString = PlayN.storage().getItem(storageKey);
// if not loaded, create stored data
if ( jsonString == null ) {
DemoApi.log("stored data not found");
jsonData.put("firstWrite", new Date().toString());
// else display data
} else {
jsonData = PlayN.json().parse(jsonString);
DemoApi.log("stored data loaded");
DemoApi.log("data first written at " + jsonData.getString("firstWrite"));
DemoApi.log("data last read at " + jsonData.getString("lastRead"));
DemoApi.log("data last written at " + jsonData.getString("lastWrite"));
}
// update last read
jsonData.put("lastRead", new Date().toString());
// write data (this works in Java -- not in HTML)
// see https://stackoverflow.com/q/10425877/1093087
/*
Json.Writer jsonWriter = PlayN.json().newWriter();
jsonWriter.object(jsonData).done();
jsonString = jsonWriter.write();
*/
// alternative write routine
Json.Writer jsonWriter = PlayN.json().newWriter();
jsonWriter.object();
for ( String key : jsonData.keys() ) {
jsonWriter.value(key, jsonData.getString(key));
}
jsonWriter.end();
jsonString = jsonWriter.write();
// store data as json
PlayN.storage().setItem(storageKey, jsonString);
// confirm
if ( PlayN.storage().isPersisted() ) {
DemoApi.log("data successfully persisted");
} else {
DemoApi.log("failed to persist data");
}
}
There's one little hitch with the Json.Writer that seems a bit buggy that I document in this question here: In the HTML version of PlayN, why does the following JSON-handling code throw an exception?
My scenario is this:
I create o custom report based on a stored procedure that returns three columns (person_id[long], name[varchar(100)], age[int], photo[image]). Those are the columns and types in my database table.
Right now i'm using something like this for each image of the report.
<img src="<%= Url.Action("ShowImage", "Reports", new {personId = result["PERSON_ID"]}) %>" />
with ShowImage being
public virtual ActionResult ShowImage(long? personId)
{
try
{
if (personId.HasValue)
{
byte[] imageArray = StudentClient.GetPersonPhotoById(personId.Value);
if (imageArray == null)
return File(noPhotoArray, "image/jpg");
#region Validate that the uploaded picture is an image - temporary code
// Get Mime Type
byte[] buffer = new byte[256];
buffer = imageArray.Take(imageArray.Length >= 256 ? 256 : imageArray.Length).ToArray();
var mimeType = UrlmonMimeType.GetMimeType(buffer);
if (String.IsNullOrEmpty(mimeType) || mimeType.IndexOf("image") == -1)
return File(noPhotoArray, "image/jpg");
#endregion
return File(imageArray, "image/jpg");
}
}
catch
{
return File(noPhotoArray, "image/jpg");
}
}
I would like to use some sort of alternative because this is very stresful due to the fact the ShowImage() calls a service method StudentClient.GetPersonPhotoById(personId.Value); for every single picture, meaning allot of calls to the service and the DB also.
I would like to actually use that photo column that returns a byte array instead of using the Person_id column through the ShowImage controller method.
That would practicaly reduce the number of calls to the service to 0 and use the actual data from the image column. This seems pretty straight forward but I struggle to find a solution.
Thank you!
Simplest solution - use OutputCache. Moreover, you can set cache location to client, and the browser will cache the images once they're downloaded. VaryByParam will give you the ability to cache images depending on personId.
There's quite a neat technique where you can stream the binary data directly from the SQL Server to the client, via the webserver.
This is my code for doing it:
public void StreamFile(Stream stream)
{
DbDataReader dr = LoadDbStream();
if (!dr.Read())
return;
const int BUFFERSIZE = 512;
byte[] Buffer = new byte[BUFFERSIZE];
long StartIndex = 0;
long Read = dr.GetBytes(0, StartIndex, Buffer, 0, BUFFERSIZE);
while (Read == BUFFERSIZE)
{
stream.Write(Buffer, 0, BUFFERSIZE);
StartIndex += BUFFERSIZE;
Read = dr.GetBytes(0, StartIndex, Buffer, 0, BUFFERSIZE);
}
stream.Write(Buffer, 0, (int)Read);
}
private DbDataReader LoadDbStream()
{
DbCommand cmd = Cms.Data.GetCommand("SELECT Data FROM CMS_Files WHERE FileId = #FileId", "#FileId", Id.ToString());
cmd.CommandType = System.Data.CommandType.Text;
cmd.Connection.Open();
return cmd.ExecuteReader(CommandBehavior.SequentialAccess | CommandBehavior.CloseConnection);
}
The command object is an ordinary command object. The key part is the CommandBehavior.SequentialAccess flag as this makes sql server only send data when you ask for. You therefore can only read the columns in the order they are specified in the query. the other point to make is stream should be the outputstream from the request & switch output buffering off.
Couple this with outputcaching and you reduce the memory load on the server.
Simon
You can use this as source form the image.
src="data:image/jpg;base64,<%= System.Convert.ToBase64String(result["PHOTO"] as byte[]) %>"
We have an ASP.Net site that redirects you to a url that shows a session-id. like this:
http://localhost/(S(f3rjcw45q4cqarboeme53lbx))/main.aspx
This id is unique with every request.
Is it possible to test this site using a standard visual studio 2008/2010 webtest? How can I provide the test this data?
I have to call a couple of different pages using that same id.
Yes, it is relatively easy to do this. You will need to create a coded webtest however.
In my example we have a login post that will return the url including the session string.
Just after the we yield the login post request (request3) to the enumerator I call the following.
WebTestRequest request3 = new WebTestRequest((this.Context["WebServer1"].ToString() + "/ICS/Login/English/Login.aspx"));
//more request setup code removed for clarity
yield return request3;
string responseUrl = Context.LastResponse.ResponseUri.AbsoluteUri;
string cookieUrl = GetUrlCookie(responseUrl, this.Context["WebServer1"].ToString(),"/main.aspx");
request3 = null;
Where GetUrlCookie is something like this:
public static string GetUrlCookie(string fullUrl, string webServerUrl, string afterUrlPArt)
{
string result = fullUrl.Substring(webServerUrl.Length);
result = result.Substring(0, result.Length - afterUrlPArt.Length);
return result;
}
Once you have the session cookie string, you can substitute it really easy in any subsequent urls for request/post
e.g.
WebTestRequest request4 = new WebTestRequest((this.Context["WebServer1"].ToString() + cookieUrl + "/mySecureForm.aspx"));
I apologise for my code being so rough, but it was deprecated in my project and is pulled from the first version of the codebase - and for saying it was easy :)
For any load testing, depending on your application, you may have to come up with a stored procedure to call to provide distinct login information each time the test is run.
Note, because the response url cannot be determined ahead of time, for the login post you will have to temporarily turn off the urlValidationEventHandler. To do this I store the validationruleeventhandler in a local variable:
ValidateResponseUrl validationRule1 = new ValidateResponseUrl();
urlValidationRuleEventHandler = new EventHandler<ValidationEventArgs>(validationRule1.Validate);
So can then turn it on and off as I require:
this.ValidateResponse -= urlValidationRuleEventHandler ;
this.ValidateResponse += urlValidationRuleEventHandler ;
The alternative is to code your own such as this (reflectored from the Visual Studio code and changed to be case insensitive.
class QueryLessCaseInsensitiveValidateResponseUrl : ValidateResponseUrl
{
public override void Validate(object sender, ValidationEventArgs e)
{
Uri uri;
string uriString = string.IsNullOrEmpty(e.Request.ExpectedResponseUrl) ? e.Request.Url : e.Request.ExpectedResponseUrl;
if (!Uri.TryCreate(e.Request.Url, UriKind.Absolute, out uri))
{
e.Message = "The request URL could not be parsed";
e.IsValid = false;
}
else
{
Uri uri2;
string leftPart = uri.GetLeftPart(UriPartial.Path);
if (!Uri.TryCreate(uriString, UriKind.Absolute, out uri2))
{
e.Message = "The request URL could not be parsed";
e.IsValid = false;
}
else
{
uriString = uri2.GetLeftPart(UriPartial.Path);
////this removes the query string
//uriString.Substring(0, uriString.Length - uri2.Query.Length);
Uri uritemp = new Uri(uriString);
if (uritemp.Query.Length > 0)
{
string fred = "There is a problem";
}
//changed to ignore case
if (string.Equals(leftPart, uriString, StringComparison.OrdinalIgnoreCase))
{
e.IsValid = true;
}
else
{
e.Message = string.Format("The value of the ExpectedResponseUrl property '{0}' does not equal the actual response URL '{1}'. QueryString parameters were ignored.", new object[] { uriString, leftPart });
e.IsValid = false;
}
}
}
}
}