Using the code example on the Twitterizer website I am trying to post a tweet to twitter with this code:
Dim asyncResult As IAsyncResult = TwitterStatusAsync.Update(
tokens.Tokens,
Tweet.Text,
[Code]....
My app is basically talking to a device via RS232. I need to 'listen' to the data received and do certain things based on it, update labels, etc. When I started, I only had a couple cross-thread calls and I used JMC's example to get by that. Now my app is bigger and I am calling the ThreadProcSafe all the time. I am hoping there is an easier way so I don't have to create sub routines for every control. Here's the relevant parts of my code.
Private Sub StepperSerialPort_DataReceived(ByVal sender As Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles StepperSerialPort.DataReceived
Dim ReceiveBuffer As String
[Code].....
I am trying to run this
vb
Public Sub SendPing(ByVal strHostname As String, ByVal objSelectedNode As TreeNode)
Try
Dim objPing As New Ping
[code]....
My problem is that in this code (and I know it's a lame way to do it) I'm checking to see if the node is Green after the Ping has been completed to determine if the ping was successful. I would prefer to return a boolean value to be True if the ping was successful.
When it executes the SendPing on the DragDrop function, it starts that thread and executes the If statement to determine if the node is green, but the ping isnt complete. Now I have to do this function on many nodes at once, so I dont want this to be a single thread. Is it possible to return a value from an async call and then execute a function after that value has been returned, or will this have to be a single thread?
I've created a Delegate that I intend to call Async.
[Code]...
Im trying to make a program in vb that will remind Me To fill out twitter party's. Where you Put the date and the time its at. hit the enter button Save the info then i messege pop up on your screen when it time for the party. And how to make it run when your computer start up.
View 10 RepliesI think this is a simple question for you, but I don't understand other cases of webRequests, so I asked here: How can I make this webRequest asynchronous?
Dim sBuffer As String
Dim oRequest As WebRequest = WebRequest.Create(url)
oRequest.Method = "GET"
Dim oResponse As WebResponse = oRequest.GetResponse()
Dim oStream As New StreamReader(oResponse.GetResponseStream())
[Code] .....
I'm trying to write a 'developer friendly' wrapper for the Windows API EnumWindows - the problem is that the API uses a callback function that gets invoked on another thread, where as I want my wrapper function to simplify this and make it more useful by working like any other normal synchronous function and just returning a value.
Now if the API just called the callback once that would be fine, as I would just call the API and make the wrapper function wait until it got a signal from the callback function telling it to continue... but the API calls the callback function over 100 times (once for every window handle that exists). The biggest problem is that there is nothing that indicates that any particular call to this callback function is the last one, so my wrapper function has no idea when it is safe to continue and return the list of window handles to the caller.
The only solution I could think of is to do this:
1. The wrapper function calls the API and starts a timer that waits 2 seconds before it raises the Elapsed event. The wrapper function then pauses until it receives a signal (ManualResetEvent)
2. Each time the callback function is raised by the API on a different thread, it stops the timer (so this is before the 2 seconds have elapsed), adds the current window handle that was passed in by the API to the list of handles, then starts the timer again.
3. If the timer reaches its 2 second interval then it is assumed that we are at the end of the windows because otherwise the callback would have stopped the timer. So the timer's Elapsed event handler is what signals the original thread (that the wrapper function is executing on) to continue as we now have a complete list of windows to return.
This works fine and does exactly what I want... but I dont like it.
I dont like forcing the caller to wait an extra 2 seconds after the API has done its last callback but more importantly I dont like assuming that the API will never take longer than 2 seconds between callbacks. In reality on my PC it is never anywhere near that long between callbacks, it is something like 200 miliseconds, but I have no idea how long it would be on a slower PC and I want this to be completely reliable.
[URL]
Trying to make a call to another forum to chance some text boxes on it and update it. I had it working I thought but the values were not holding when I closed the box so I came up with this solution but Im getting null exceptions.[code]....
View 11 RepliesOnce I click Sign in, I want the application to test to see if the user has internet. If it does I want it to call another sub. If the network is not available I want a message to come up and say Error, no internet connection.
This is what I tried but can get it to work If My.Computer.Network.IsAvailable Then Call testnet()
else Messagebox.show("Error", "Truoble connecting to data base")
i wanna make a program with vb that can make pc to phone calls and i wanna know if it is possible with vb or if i need another program because im new to this programing thing
i added a tool in toolbox called phonecall but however i cant use it i dont know why
What the Win32 API is? I have looked around but no where really outlines what it is. Is it basically a set of procedures, outlined by Microsoft for programmers in order to get services from the operating system? In essence is it the equivalent to making system calls abd and library calls in UNIX? And yes I now Windows makes library calls too.
View 2 RepliesThe scenario is that an ASP.NET webforms page will call a web service in an async manner to make about 8 web service calls to various providers for data. I would like to run them in parallel to speed things up. I also need to wait for them all to come back before moving on.
View 1 RepliesI'm fairly new to .NET programming. I am trying to check if there are settings in a database table and if not, create some default settings. The problem is that when there are no settings I need to make two calls with the datareader and it keeps giving me problems. I originally was only using one datareader but made two to attempt resolving my issue, didn't work. Then I tried closing the datareader and I get errors because it returned a nullreference.
[Code]...
I am trying to create an application that will make calls to an API. I want this process to be fully automated to run a few times a day. What kind of application in vb.net can be automated? I've created windows applications in the past, but never automated anything.
View 8 RepliesI want to use a database table as a a queue...but the processing of these messages cannot be done from the database.I have a table that stores the requests i get from a .Net component. I now have to read the data from these tables and make http calls to 2 webservices. Based on the response received from the webservices, the data gets archived or deleted.I had a few specific questions:
1. How do i make sure that if i pick a record for processing and the http call fails I should be able to go on to the next record, and then come back to this record at the end of the run
2. Is there an alternative to using the database as a queue(like MSMQ etc.), which option is better
3. I want to maintain an audit trail of the record status. Is creating a trigger to log the changes before the edit the best way to do it?
I have been using DBTransaction for my current projects that access a single database. However, I read some documentation on TransactionScope and was wondering in which scenario would using TransactionScope be better? Or should I be replacing DbTransaction calls with calls to TransactionScope?
View 2 Replies[URL]
In my program, I created a list of a class that contains 5 picture boxes, a button, a label, an identifier, and some other stuff. I've got roughly 65 of these in this list. I'd be stupid to hard code all that in. The identifier is a 2nd way of identifying which specific location I'm working on.
Anways, all this is created at compile time. Works perfectly fine.
I then manually start a background worker that pings a collection of components. Based off the success of those pings, the picture boxes are enabled or disabled. Basically a proactive way to see if a collection of devices over multiple locations are actually working.
It's the background worker that fails because of thread-safe calls.
Private Sub bgwStatus_DoWork(ByVal sender As Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles bgwStatus.DoWork
Dim status As Integer
[Code].....
how I can control the tool tip popup or make calls to the text that displays based on a integer value. I'm wanting it to display a text based on a interger value inside an if statment for a picture box. So if the ingteger = 1 then tooltip.text = "" else tooltip.text = "" but that is not the correct syntax.
View 2 RepliesI have a LOB app written in VB.NET with a WinForms front-end and SQL back-end. After many months weighing up how to get onto the Web, I decided last month to use Silverlight 2. Now, Silverlight 3 Beta is out, but there is no end-user runtime.
Does anyone know when the runtime will be available for deployment of SL 3 apps onto client sites?
My dev timeline is about 3 months: should I persist with SL 2 and then u/g to SL3, or jump straight in to SL3?
I have an application that I am reworking. It has many reports and a pain to compile and roll out.I'd like to make a root user interface that "calls" the functions and subs remotely.I was concidering pulling them and making formless exe's of them, passing the needed criteria via command line. Yet still be able to update and control them.
View 4 RepliesI'm trying to import an XML that's provided by twitter into a readable format in Visual Basic.[code]...
Now, I want to display it in a panel that automatically refresh after a certain period, however, I only want to pick out certain bits of info from that xml, such as profile_image_url and text and created_at. You can guess how the data will be formatted, much like that presented in TweetDeck and other Twitter clients.
what im trying to do is programaticly click the unfollow button in a twitter profile..i use to be able to do this easily but not it seems they hid the button or i am just doing something wrong,first i'll give you the source code of the page,, then the stuff i tried, or some of the stuff i tried. [code]
View 2 RepliesI'm trying to follow this example to access Twitter Stream API(userstream) so I need to do some modifications and this is my final code:
[Code]...
after a lot of work and late nights, I finally have something to give back to the VBForums community which has helped me so much.TwitterVB is a library for communicating with Twitter. It's 100% Visual Basic.NET and coded against version 2.0 of the .NET Framework. It is free, and it is open source.
TwitterVB contains a working implementation of OAuth, which allows your application's name to appear in tweets.I hope that this library proves to be useful to VB.NET developers who are looking to develop their own Twitter applications.TwitterVB can be found at http://code.google.com/p/twittervb
If you'd like to see a working implementation of TwitterVB in action, you can look at the Twitter client that I built with it: Quitter. Like TwitterVB, Quitter is 100% Visual Basic.NET. It is also free and open source. Quitter can be found at[URL]..
I would like to add my twitter feed to my application in form1.
How would I go about doing this?
How can I parse json from such as twitter etc in vb.net applications.
View 2 RepliesI need to parse an xml document from twitter selecting certain nodes and placing the value in variables.I get an error...Conversion from string "user/screen_name" to type 'Integer' is not valid. Parsing XML is out of my league.
First the Twitter XML file...
<?xml version="1.0" encoding="UTF-8"?>
<statuses type="array">
<status>
<created_at>Sat Apr 30 04:10:46 +0000 2011</created_at>
[code]....
Now the only problem which will be a simple fix is a retweet doesn't display correctly because the nodes are different so I'll just add a If then to see if it is a retweet then adjust the nodes accordingly.
What I need to do to make my program able to change facebook/twitter Status? as the text in textbox(when button 1 clicked)
View 3 Replieshow to read tweets from a twitter account that is open to the public.i have been searching around google but everything I find is about posting to twitter or uploading photos etc nothing about actually listing (thats a lie I found one in I think c# which doesnt make sense to me)Basically there is an account #WurmOnline and I need to be able to list all of the tweets from that account in my application but I don't even know where to begin.
View 3 RepliesIs there a way I can update my twitter through a visual basic application? So like have 3 textboxes on the form for username, password, and tweet. Then a button to upload it? Or is this not possible?
View 15 Replies
