I have followed the instructions as found in the documentation; however, when I launch my app using the specified protocol my-protocol:// (typed into a web browser), the app will launch but then it just stays on the splash screen, as if the navigation fails to do anything:
Code Example:
// MyApp.UWP/App.xaml.cs
protected override void OnActivated(IActivatedEventArgs args)
{
if (args.Kind == ActivationKind.Protocol)
{
ProtocolActivatedEventArgs eventArgs =
args as ProtocolActivatedEventArgs;
// TODO: Decide where to navigate, but for now just go to main page
Frame rootFrame = Window.Current.Content as Frame;
rootFrame.Navigate(typeof(MainPage), args);
}
}
Is there something obvious that I am doing wrong? Perhaps there is a better way to handle navigation? Or perhaps there is something that I overlooked?
Edit
This is particularly hard to troubleshoot, since I can't just run with debug in visual studio. To test it out I actually have to launch it from the my-protocol://, which is not connected to the debugger.
Is there a way to debug this when launched from the url / protocol?
I could reproduce your issue. #kennyzx's suggestion was correct. You would first need to do judgement before navigating.
Please refer to the following code sample for reference.
protected override void OnActivated(IActivatedEventArgs args)
{
base.OnActivated(args);
if (args.Kind == ActivationKind.Protocol)
{
ProtocolActivatedEventArgs eventArgs =
args as ProtocolActivatedEventArgs;
// TODO: Decide where to navigate, but for now just go to main page
Frame rootFrame = Window.Current.Content as Frame;
if (rootFrame == null)
{
rootFrame = new Frame();
}
Window.Current.Content = rootFrame;
rootFrame.Navigate(typeof(MainPage), args);
Window.Current.Activate();
}
}
Related
I would like to show ActivityIndicator object after user tap the login button on page. Unfortunately there is small problem to do that because it seems like ActivityIndicator change state after entire method is completed. This is code I wrote so far:
private void Login(object sender, EventArgs ev)
{
BusyIndicator.IsVisible = true; //<- here I want to show indicator
try
{
//some input validation, connection opening etc
ConnectionHandler.OpenConnection(ServerIP, "dmg", false);
}
catch (Exception e)
{
Logging.Error(e.Message, "Connection", e);
}
}
When I set breakpoint after BusyIndicator.IsVisible = true; there is absolutely no change in app. However I noticed that when method is completed then indicator is shown. Is this a correct behavior of this control?
Why I need this? Because field validation and connecting with server takes some time and I need to show to user that something happens in background. Login function takes ~1 sec so indicator show and hide quickly I can't even see any change.
How can I show indicator immediately after user tap a button?
Your problem is that Login() method is being executed in the UI thread. So, despite setting BusyIndicator.IsVisible = true;, the thread continues tio execute the method to get data, so the UI does not respond.
Solution, run the OpenConnection in a different thread:
private async void Login(object sender, EventArgs ev)
{
BusyIndicator.IsVisible = true; //<- here I want to show indicator
try
{
//some input validation, connection opening etc
await Task.Run(() => { ConnectionHandler.OpenConnection(ServerIP, "dmg", false);});
}
catch (Exception e)
{
Logging.Error(e.Message, "Connection", e);
}
}
I'm trying to show window when user need to be notify about some work to do. Every think work fine, but i want to show form absolute topmost. I set form property TopMost = true but it does not work, window still show behind other forms.
I figure out that TopMost = true don't work only with BackgroundWorker, when i use Timer class it work fine. I'm wonder why? Anybody can explain me this?
Here is simple example what i want to do.
static void Main(string[] args)
{
try
{
BackgroundWorker worker = new BackgroundWorker();
worker.DoWork += new DoWorkEventHandler(worker_DoWork);
worker.RunWorkerAsync();
Application.Run(new Form());
}
catch (Exception exp)
{
Console.WriteLine(exp);
}
}
static void worker_DoWork(object sender, DoWorkEventArgs e)
{
while (true)
{
System.Threading.Thread.Sleep(1000);
if (NeedNotify())
{
NotifyForm myNotifyForm = new NotifyForm();
myNotifyForm.TopMost = true;
myNotifyForm.ShowDialog(); // NotifyForm still show behind others windows
}
}
}
private static bool NeedNotify()
{
return true;
}
}
Creating the form within the background worker causes the form to be created on a different thread. Instead, create and show the form in your main thread before calling RunWorkerAsync.
Another problem may arise from the fact that you're creating the "notification" before the application's main loop is even started. You may consider reorganizing your code so that the background worker is started from the main form's OnLoad event.
Newbie question about JavaFX that I haven't been able to answer, despite knowing it must be pretty simple to do and not finding any resources on it anywhere I've looked (tutorials, many of the Oracle online docs, articles, the well-known JavaFX bloggers, etc.)
I'm developing a command line (script) running application and I have successfully gotten output (via ProcessBuilder) from the script that I can display in an ongoing manner, as things happen on the command line. That is, I can do System.out.println(line); all day long, showing the output in the console, which simply returns output from an input stream returned by the 'myProcess' that's running, created like this:
BufferedReader bri = new BufferedReader(new InputStreamReader(myProcess.getInputStream()))
So I am able to see all the output coming back from the script.
I'd like to set-up a JavaFX TextArea or ScrollPane or, not sure what, to display this output text (there's a lot of it, like several thousand lines) as an ongoing 'progress' of what's taking place in the script, as it happens. I have a Scene, I have buttons and get input from this scene to start the script running, but now I'd like to show the result of clicking the button "RUN THIS SCRIPT", so to speak.
I assume I need to create a TextArea as described here or perhaps a TextBuilder would be useful to begin making it. Not sure.
I need a bit of help in how to setup the binding or auto-scroll/auto-update part of this.
Can someone provide me a place to start, to do this with JavaFX? I'd rather not use Swing.
(I'm using JavaFX 2.2, JDK 1.7u7, all the latest stuff, and yes, this is an FXML app--so doing it that way would be preferred.)
UPDATE: Sergey Grinev's answer was very helpful in the binding part. But here is some more detail on what I mean when I ask for "a bit of help in how to setup" -- basically, I need to return control to the main Scene to allow the user to Cancel the script, or to otherwise monitor what's going on. So I'd like to "spawn" the process that runs that script (that is, have some kind of 'free running process'), but still get the output from it. (I wasn't very clear on that in my initial question.)
The technique I'm using here (see below) is to do a waitFor on the process, but of course this means the dialog/Scene is 'hung' while the script executes. I'd like to gain control back, but how do I pass the 'p' (Process) to some other controller piece (or alternatively, simply kick off that other process passing in the parameters to start the script and have it start the script) that will then do the auto-update, via the binding Sergey Grinev mentions--without 'hanging' the Scene/window? Also: Can I then 'stop' this other process if the user requests it?
Here is my current code ('waits' while script--which takes 20-40 min to run!--completes; this is not what I want, I'd like control returned to the user):
public class MyController implements Initializable {
#FXML
private void handleRunScript(ActionEvent event) throws IOException {
ProcessBuilder pb = new ProcessBuilder("myscript.sh", "arg1", "arg2", ...);
Process p = pb.start();
try {
BufferedReader bri = new BufferedReader
(new InputStreamReader(p.getInputStream()));
String line;
while ((line = bri.readLine()) != null) {
System.out.println(line);
textAreaRight.setText(line);
}
bri.close();
p.waitFor();
}
catch (Exception err) {
err.printStackTrace();
}
}
#FXML
private void handleCancel(ActionEvent event) {
doSomethingDifferent();
}
}
To log strings you can use TextArea
To make it asynchronious you need to make a separate thread for output reader.
public class DoTextAreaLog extends Application {
TextArea log = new TextArea();
Process p;
#Override
public void start(Stage stage) {
try {
ProcessBuilder pb = new ProcessBuilder("ping", "stackoverflow.com", "-n", "100");
p = pb.start();
// this thread will read from process without blocking an application
new Thread(new Runnable() {
#Override
public void run() {
try {
//try-with-resources from jdk7, change it back if you use older jdk
try (BufferedReader bri = new BufferedReader(new InputStreamReader(p.getInputStream()))) {
String line;
while ((line = bri.readLine()) != null) {
log(line);
}
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
}).start();
stage.setScene(new Scene(new Group(log), 400, 300));
stage.show();
} catch (IOException ex) {
ex.printStackTrace();
}
}
#Override
public void stop() throws Exception {
super.stop();
// this called on fx app close, you may call it in user action handler
if (p!=null ) {
p.destroy();
}
}
private void log(final String st) {
// we can access fx objects only from fx thread
// so we need to wrap log access into Platform#runLater
Platform.runLater(new Runnable() {
#Override
public void run() {
log.setText(st + "\n" + log.getText());
}
});
}
public static void main(String[] args) {
launch();
}
}
Last few days I thinkin about output cache in asp.net. In my task I need to implement output cache for the very big project. After hours of searching I did not find any examples.
Most popular way to use output cache is declarative, in this case you need to write something like this on the page which you want to cache.
But if you need to cache whole site you must write this on all pages or master pages on project. It is madness. In this case you cant store all configuration in one place. All page have his own configurations..
Global.asax could help me, but my site contains about 20 web progects and ~20 global.asax files. And i don't want copy same code to each project.
For these reasons, i made decision to create HTTPModule.
In Init method i subscribe to two events :
public void Init(HttpApplication app)
{
app.PreRequestHandlerExecute += new EventHandler(OnApplicationPreRequestHandlerExecute);
app.PostRequestHandlerExecute += new EventHandler(OnPostRequestHandlerExecute);
}
In method "OnPostRequestHandlerExecute" I set up output caching parameters for each new request :
public void OnPostRequestHandlerExecute(object sender, EventArgs e)
{
HttpApplication app = (HttpApplication)sender;
HttpCachePolicy policy = app.Response.Cache;
policy.SetCacheability(HttpCacheability.Server);
policy.SetExpires(app.Context.Timestamp.AddSeconds((double)600));
policy.SetMaxAge(new TimeSpan(0, 0, 600));
policy.SetValidUntilExpires(true);
policy.SetLastModified(app.Context.Timestamp);
policy.VaryByParams.IgnoreParams = true;
}
In "OnApplicationPreRequestHandlerExecute" method I set calback method to cache validation:
public void OnApplicationPreRequestHandlerExecute(object sender, EventArgs e)
{
HttpApplication app = (HttpApplication)sender;
app.Context.Response.Cache.AddValidationCallback(new HttpCacheValidateHandler(Validate), app);
}
And last part - callback validation method :
public void Validate(HttpContext context, Object data, ref HttpValidationStatus status)
{
if (context.Request.QueryString["id"] == "5")
{
status = HttpValidationStatus.IgnoreThisRequest;
context.Response.Cache.AddValidationCallback(new HttpCacheValidateHandler(Validate), "somecustomdata");
}
else
{
status = HttpValidationStatus.Valid;
}
}
To attach my HttpModule I use programmatically attach method :
[assembly: PreApplicationStartMethod(typeof(OutputCacheModule), "RegisterModule")]
This method works perfectly, but I want to know is there other ways to do this.
Thanks.
Try seeing if IIS caching provides what you need.
http://www.iis.net/configreference/system.webserver/caching
Along the lines of this question I want to create a HttpModule that will do some custom logging of requests and responses for us. Using the code in the most popular answer for that question I've got a HttpModule up and running which does indeed work:
class PortalTrafficModule : IHttpModule
{
public void Dispose()
{
// Do Nothing
}
public void Init(HttpApplication context)
{
context.BeginRequest += new EventHandler(context_BeginRequest);
context.EndRequest += new EventHandler(context_EndRequest);
}
private void context_BeginRequest(object sender, EventArgs e)
{
HttpContext context = ((HttpApplication)sender).Context;
// Create and attach the OutputFilterStream to the Response and store it for later retrieval.
OutputFilterStream filter = new OutputFilterStream(context.Response.Filter);
context.Response.Filter = filter;
context.Items.Add("OutputFilter", filter);
// TODO: If required the request headers and content could be recorded here
}
private void context_EndRequest(object sender, EventArgs e)
{
HttpContext context = ((HttpApplication)sender).Context;
OutputFilterStream filter = context.Items["OutputFilter"] as OutputFilterStream;
if (filter != null)
{
// TODO: Log here - for now just debug.
Debug.WriteLine("{0},{1},{2}",
context.Response.Status,
context.Request.Path,
filter.ReadStream().Length);
}
}
}
(note that the OutputFilterStream class referred to in the code is in the referenced question).
However, the responses seem to be missing some HTTP headers that I see in Fiddler (like "Date") and more importantly, when I turn on compression the responses I'm logging aren't compressed whereas what I see in Fiddler is.
So my question - is it possible to log the compressed content or is this happening in a subsequent step my module can't hook in to?
For the record, I've also tried handling the PreSendRequestContent event and the response is still uncompressed.
Hi although I cannot answer your questions directly I have had cause to do similar things in the past and have found the following resource extremely helpful and enlightening. In the end I managed to acheive what I needed for raw soap headers by configuring the System.Diagnostics node within web config and create a trace log of traffic. I understand that your needs may be more granular than that however I believe this resource may still help.
http://msdn.microsoft.com/en-us/library/ms731859
Of particular interest may be the message log configuration and viewing message logs links from the one above.