Hello) Can you please help me I need to make a thread sleep with pressing the button and continue this thread by pressing button1. I deal with WPF and when i call WaitOne() method in button1_click event my form becomes freezed and i can't click any button. here's example of my code:
AutoResetEvent objAuto = new AutoResetEvent(false);
private void Button_Click(object sender, RoutedEventArgs e)
{
if (thread != null)
{
objAuto.Set();
}
thread = new Thread(new ThreadStart(zoo.FeedAnimals));
thread.Start();
}
private void Button_Click_1(object sender, RoutedEventArgs e)
{
objAuto.WaitOne();
}
Thanks for advance
The reason why it freezes is because you call WaitOne on the UI thread. You probably want something along the lines
AutoResetEvent objAuto = new AutoResetEvent(false);
private void Button_Click(object sender, RoutedEventArgs e)
{
thread = new Thread(new ThreadStart(zoo.FeedAnimals));
thread.Start();
}
private void Button_Click_1(object sender, RoutedEventArgs e)
{
if (thread != null)
{
objAuto.Set(); // this is in the main UI thread
}
}
public void FeedAnimals()
{
...
objAuto.WaitOne(); // this blocks your other thread
...
}
Related
I interested in one interesting task. I have UI in JavaFx with another thread which updates UI. I started updates from Platform.runLater. Code:
private void startUpdateDaemon() {
updateUserStatus();
updateTable();
}
private void startUpdateDaemonTask() {
Task task = new Task<Void>() {
#Override
protected Void call() throws Exception {
while (true) {
Platform.runLater(() -> {
startUpdateDaemon();
});
Thread.sleep(1000);
}
}
};
Thread th = new Thread(task);
th.setDaemon(true);
th.start();
}
#Override
public void initialize(URL location, ResourceBundle resources) {
startUpdateDaemonTask();
}
Also I have place in another class where I updates UI:
private void startUpdateDaemonTask() {
Task task = new Task<Void>() {
#Override
protected Void call() throws Exception {
while (true) {
Platform.runLater(new Runnable() {
#Override
public void run() {
updateGameStatus();
}
});
Thread.sleep(1000);
}
}
};
Thread th = new Thread(task);
th.setDaemon(true);
th.start();
}
So, finally I have two places with call "Platform.runLater" and different methods inside.
My question is Can I create only "one" method with one time call "Platform.runLater" and send to this method different methods which will be call ?? May be I can write finish method with consumers and send to him methods 'startUpdateDaemon()' and 'updateGameStatus()'?
Thanks a lot.
You can add a Runnable parameter to your method. This parameter is given to you Platform.runLater:
private void startUpdateDaemonTask(Runnable runner) {
Task task = new Task<Void>() {
#Override
protected Void call() throws Exception {
while (true) {
Platform.runLater(runner);
Thread.sleep(1000);
}
}
};
Thread th = new Thread(task);
th.setDaemon(true);
th.start();
}
Now you can invoke this method with your method references:
startUpdateDaemonTask(this::startUpdateDaemon);
startUpdateDaemonTask(this::updateGameStatus);
Is there a way for a button to be executed in seconds without touching it.
The following code execute the button in one second but after i touch the button. My question is can this be achieved without touching the button?
View.OnClickListener mButtonStartListener = new View.OnClickListener() {
public void onClick(View v) {
try {
mHandler.removeCallbacks(hMyTimeTask);
// Parameters
// r The Runnable that will be executed.
// delayMillis The delay (in milliseconds) until the Runnable will be executed.
mHandler.postDelayed(hMyTimeTask, 1000); // delay 1 second
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
};
private Runnable hMyTimeTask = new Runnable() {
public void run() {
nCounter++;
hTextView.setText("Hallo from thread counter: " + nCounter);
}
};
/**
*
*/
View.OnClickListener mButtonStopListener = new View.OnClickListener() {
public void onClick(View v) {
mHandler.removeCallbacks(hMyTimeTask);
}
};
You may simulate click event by following code
View.performClick();
originally posted at https://stackoverflow.com/a/4877526/5329101.
Try .onLoadCompleteListener instead of .onClickListener
This is Form1
public static BackgroundWorker[] threadArray;
//public static AutoResetEvent[] _eventHandles ;
public static readonly object _lockObj = new object();
public static bool _go ;
//public static ManualResetEvent _manualResetEvent = new ManualResetEvent(false);
private void BackgroundWorkerFilesDoWork(object sender, DoWorkEventArgs e)
{
...
lock (_lockObj)
{
//_manualResetEvent.WaitOne(30000);
//_manualResetEvent.Reset();
//if (clsValueStatic.CaptchaText != null)
//{
// foreach (var id in clsValueStatic.CaptchaText)
// {
while (!_go)
{
Monitor.Wait(_lockObj);
}
// }
//}
}
...
}
private void btn_Start_Scraping_Click(object sender, EventArgs e)
{
ServicePointManager.DefaultConnectionLimit = slider_Thread.Value;
threadArray = new BackgroundWorker[listView_Site.Items.Count];
for (var f = 0; f < listView_Site.Items.Count; f++)
{
threadArray[f] = new BackgroundWorker();
threadArray[f].DoWork += new DoWorkEventHandler(BackgroundWorkerFilesDoWork);
threadArray[f].RunWorkerCompleted += new RunWorkerCompletedEventHandler(BackgroundWorkerFilesRunWorkerCompleted);
threadArray[f].ProgressChanged += new ProgressChangedEventHandler(BackgroundWorkerFilesProgressChanged);
threadArray[f].WorkerReportsProgress = true;
threadArray[f].WorkerSupportsCancellation = true;
threadArray[f].RunWorkerAsync(listView_Site.Items[f].Tag.ToString());
}
}
This is Form2
private void textBoxCaptcha_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Enter)
{
var textBox = sender as TextBoxX;
if (textBox != null)
{
lock (frmScrapingAnalysis._lockObj)
{
//clsValueStatic.CaptchaText = null;
////frmScrapingAnalysis._go = true;
//clsValueStatic.CaptchaText.Add(textBox.Tag.ToString(), textBox.Text.Trim());
//textBox.Parent.Parent.Dispose();
Monitor.Pulse(frmScrapingAnalysis._lockObj);
}
//frmScrapingAnalysis._manualResetEvent.Set();
//frmScrapingAnalysis._eventHandles[frmScrapingAnalysis.positionThread].Set();
}
}
}
this is program to login website
Form1 have 1 button to start multiple backgroundworker and show form2 then all backgroundworker wait to get text captcha of textbox from form2
my way want when user enter text of backgroundworker is shown on form2 then only the backgroundworker is released. All other backgroundworker still wait
I try to code and debug with AutoResetEvent/ManualResetEvent and Monitor.Wait()/Pulse() and EventWaitHandle but order execution of all backgroundworker is FIFO
3 days ago, I still have not been anyway to solve this problem :(
Or other anyway can solve my problem. Thank you so much
I have a TableView associated with some data, and once i hit a run button i perform some processing on that data. Each row of data is handled in a seperate thread, and while those threads are running i want a ProgressInducator to replace the table within its vbox.
In the attached code:
If I stop where is says "WORKS IF STOP HERE" - table is replaced with pi.
If I continue waiting for the threads to join - no replacing.
What am I missing?
runButton.setOnAction(
new EventHandler<ActionEvent>() {
#Override
public void handle(final ActionEvent e) {
List<Thread> threadList = new ArrayList<Thread>();
int threadCounter = 0;
final ProgressIndicator pi = new ProgressIndicator(threadCounter);
vbox.getChildren().clear();
vbox.getChildren().addAll(pi);
for (ProductInTable product : data) {
Thread thread = new Thread(new Runnable() {
#Override
public void run() {
try
{
product.calculate();
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
});
threadList.add(thread);
thread.start();
}
int x = threadList.size();
/** WORKS IF STOP HERE **/
// wait for all threads to end
for (Thread t : threadList) {
try {
t.join();
threadCounter++;
pi.setProgress(threadCounter / x);
} catch (InterruptedException interE) {
interE.printStackTrace();
}
}
/** DOESNT WORKS IF STOP HERE **/
Thread.join() blocks execution until the thread is completed. Since you are calling this on the FX Application Thread, you block that thread until all your worker threads finish. This means the UI is unable to update until those threads are complete.
A better approach is probably to represent each computation with a task, and update a counter of complete tasks back on the FX Application Thread using setOnSucceeded. Something like:
runButton.setOnAction(
new EventHandler<ActionEvent>() {
#Override
public void handle(final ActionEvent e) {
final ProgressIndicator pi = new ProgressIndicator(threadCounter);
vbox.getChildren().clear();
vbox.getChildren().addAll(pi);
final int numTasks = data.size();
// only access from FX Application thread:
final IntegerProperty completedTaskCount = new SimpleIntegerProperty(0);
pi.progressProperty().bind(completedTaskCount.divide(1.0*numTasks));
completedTaskCount.addListener(new ChangeListener<Number>() {
#Override
public void changed(ObservableValue<? extends Number> obs, Number oldValue, Number newValue) {
if (newValue.intValue() >= numTasks) {
// hide progress indicator and show table..
}
}
});
for (final ProductInTable product : data) {
Task<Void> task = new Task<Void>() {
#Override
public Void call() {
try
{
product.calculate();
} catch (IOException ioe) {
ioe.printStackTrace();
}
return null ;
}
});
task.setOnSucceeded(new EventHandler<WorkerStateEvent>() {
#Override
public void handle(WorkerStateEvent event) {
completedTaskCount.set(completedTaskCount.get()+1);
}
});
new Thread(task).start();
}
}
});
If you potentially have a large number of items here, you should use some kind of ExecutorService instead to avoid creating too many threads:
ExecutorService exec = Executors.newFixedThreadPool(
Runtime.getRuntime().availableProcessors()); // for example...
and then replace
new Thread(task).start();
with
exec.submit(task);
[DefaultEvent("MyCustomEvent")]
public partial class WebUserControl1 : System.Web.UI.UserControl
{
public delegate void onButtonClick(object sender, Myeventargs e);
public event onButtonClick btnHandler;
protected void ASPxButton1_Click(object sender, EventArgs e)
{
if (btnHandler != null)
{
btnHandler(this,e);
}
}
}
this code can work with
public partial class jscript : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
XFButton1.MYClick += new EventHandler(XFButton1_MYClick);
}
void XFButton1_MYClick(object sender, EventArgs e)
{
ASPxLabel1.Text = "Hello";
}
but the problem is i want it automatically generate a new event when i double click on the button. can i done this by using a web user control ?
too bad to tell you that web user control may not able to do like that... pls read this http://dotnet-framework-aspnet.itgroups.info/32/9/thread-796040.html.