I really can't get this to work, basically when my JSON feeds loads I want the indicator to show, then hide when it's stopped. It loads top level menu items 1st "Publishing, Broadcasting, Marketing Services", then when Broadcasting is selected it loads a feed using the JSON framework hosted on Google. Round this load I call startIndicat...
Possible Duplicate: .NET Controls: Why arent all calls thread-safe? This question is not about what is a cross-thread operation, and how to avoid it, but why internal mechanics of .NET framework does not allow a cross-thread operation. I can`t understand why a SerialPort DataReceived event cannot update a simple text box on ...
Hi, I encounter a problem with a Windows Forms application. A form must be displayed from another thread. So in the form class, I have the following code: private delegate void DisplayDialogCallback(); public void DisplayDialog() { if (this.InvokeRequired) { this.Invoke(new DisplayDialogCallback(DisplayDialog)); }...
Hello Friends, I am new to .NET Windows application & unfortunately, to the MultiThreading. My problem is as below: I have application in which I spawn three threads (3: activity thread, snapshot thread, upload thread) which every minute take snapshot of screen and logs mouse-keyboard activity in database. Now, every time I insert a re...
I have an application wherein I am hosting multiple types of content (images, PowerPoint presentations, videos etc) in a kiosk-type app. The user has to be able to page back and forth between these bits of content, preferably using gestures of the touchscreen on the kiosk, i.e. tap one side of the screen to go forward, the other side to ...
I have a function which adds a control to a parent control which is called from threads different to the thread the controls were created on. This is how it goes: 1 delegate void AddControlToParentDelegate(Control child, Control parent); 2 private void addControlToParent(Control child, Control parent) { 3 if (parent...
Hi, I'm working on a system which has a 4 modules, each working on its own server and each should be able to clustered. What I basically need is to have the ability to work on the same entities on the different modules and have them update appropriately when changes occur on different threads,JVMs and servers. I've heard, mostly as a b...
Hi, I've a little problem with this code: This is the "main" method of the app: private Thread main_process; private Clases.GestorTR processor; public void begin() { processor = new Clases.GestorTR(); main_process = new Thread(new ThreadStart(processor.ExecuteP)); main_process.Start(); } I've created a Thread to process ot...
According to Single-Threaded Application with Long-Running Calculation MSDN example, there is a possibility of creating a responsive GUI in just 1 thread. Thanks to the Dispatcher object, as we can set the Priority of work items. My question is, what sense does it have to do simple tasks (supposing we just have 1 single core cpu) in a ...
I have two forms, Form A and Form B. My Properties.Settings.Default has a timer object that when "ticked" needs to open Form B. What I would like to do is program the timer_tick(object sender, Eventargs e) event for the timer object that is in the solution's properties. Is this possible? If so how? The issue I am having is I don't know...
Here is my situation: I instantiated a c# usercontrol on a main thread, but it is not added to the form. //global declaration usercontrol1 datacontrol; constructor() { ....... datacontrol = new usercontrol1(); ........ } I then have an asyhcnronous background thread that fires an event that is handled by the instantiated data...
Here is my code scenario, In main thread I create panel(s) (based on some configuration), and then in the next step based on the file type (like video, ppt, image...) I create appropriate controls (dynamically) to show on the forms. The creation of the control will be done in separate threads (for each file). After creating the control...
I'm trying to add items to a list view in a different thread than it was created in and am getting a cross-thread error. How can I make this element accessible in other threads? ...
Hello. I am work with SharpPcap library. I have following code: private void button1_Click(object sender, EventArgs e) { LivePcapDevice device = deviceList[cbDeviceList.SelectedIndex]; device.OnPacketArrival += new PacketArrivalEventHandler(device_OnPacketArrival); device.Open(DeviceMode.Promiscuous, 1000); ...
I am dealing a big situation in architecture design flaw in multiple threading. I try to keep my application completely thread safe and avoid conflict with each others. The problem I was aware was this: Assume there are two threads, Thread A and Thread B. Thread A is something that you'll see from Static Void Main method as the only t...
Since .NET 4.0 there is the TPL to execute asynchronous tasks. If you are reading the msdn, all async operations interacting with forms / UI still uses the InvokeRequire ... Invoke() pattern. What I'm asking is that is there a reason for it? From what I learned, TPL should be sort of a replacement of older threading mechanisms. So what's...
I am attempting to write a specialized onscreen keyboard (OSK) for an application I'm writing in C#. To facilitate this, I've created a form which has several buttons on it representing keys, and clicking them calls SendKeys and sends out the appropriate keys. This form is owned by the main window that is shown when the application firs...
I've been reading around trying to find out why I'd be getting this exception to no avail. I hope someone has seen this before: I'm using Visual Basic 2010. Briefly, I have a "Settings Panel" form which takes a while to create (it contains a lot of labels and textboxes), so I create it in another thread. After it's loaded, it can be ...
So this is a very weird situation, and I'm sure not very pythonic. But I'm not actually using this in any production code, I'm just considering how (if?) this could work. It doesn't have to be python specific, but I'd like a solution that at least WORKS within python framework. Basically, I have a thread safe singleton object that imple...
I was debugging an application and somewhere in the code, a thread tries to reach a listbox that was created by another thread. On attempt to access the listbox, the application throws a "Cross-thread operation not valid: Control 'listbox' accessed from a thread other than the thread it was created on" exception while debugging. However,...