I want to frequently read some data from some Internet pages, so I've written a loop and I've used WebRequest Class to download data. After running it, in 1st loop's repeat it read the data properly but in the 2nd repeat it gave "The operation has timed out!" message. All web addresses are correct (I've checked them). Should I close request or something else after each loop's repeat. The brief code is here:
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I am using an httpWebRequest in my windows app to download files from a webserver (sURL), to a local folder (fileDestination) as such:
Public Function DownloadFile(ByVal sURL As String, _
ByVal fileDestination As String, _
ByVal WebRequestType As String) As Boolean
Dim URLReq As HttpWebRequest
Dim URLRes As HttpWebResponse
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This works fine for the first few files. But then it starts giving the error:
"operation has timed out"
on the URLReq.GetResponse line.
i have a datagridview and each row got link.. and i using timer and backgroundworker as downloading file.. the 1st file download, its perfect working.. but when its going to download 2nd link from datagridview, nothing happened.. even its said, "The operation has timed out"..
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When I push in my program button which read data from serial port, then when are here not data, it write this error which stop program:The operation has timed out.When I push in my program button to read data from serial port and when the data exists there, then is all OK...Please what can I do for eliminating this message = when are not data in serial port, then I want become NO DATA and when exists data in serial port then I write this data....Here is shorted program:
Private Sub program_Load(ByVal eventSender As System.Object, ByVal eventArgs As System.EventArgs) Handles MyBase.Load
Port1.PortName = "COM1"
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When I push in my program button which read data from serial port, then when are here not data, it write this error which stop program:The operation has timed out.When I push in my program button to read data from serial port and when the data exists there, then is all OK...what can I do for eliminating this message = when are not data in serial port, then I want become NO DATA and when exists data in serial port then I write this data....
Private Sub program_Load(ByVal eventSender As System.Object, ByVal eventArgs As System.EventArgs) Handles MyBase.Load
Port1.PortName = "COM1"
Port1.BaudRate = 9600
Port1.DataBits = 8
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"The operation is timed out " in use with timer and reading serial buffer.I read every 50msec (timer) serial buffer and when are not data in serial buffer, then VB2008 write "The operation is timed out" and program stopped.When are data in serial buffer, then is all OK.PLEASE what can I do, when I want NOT stop program, when are not data in serial buffer.I use this code in timer:
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I am calling 5 external servers to retrieve XML-based data for each request for a particular webpage on my IIS 6 server. Present volume is between 3-5 incoming requests per second, meaning 15-20 outgoing requests per second.
99% of the outgoing requests from my server (the client) to the external servers (the server) work OK but about 100-200 per day end up with a "The operation has timed out" exception.
I have a resource problem on my server - some shortage of sockets, ports etc or a thread lock but the problem with this theory is that the failures are entirely random - there are not a number of requests in a row that all fail - and two of the external servers account for the majority of the failures.
My question is how can I further diagnose these exceptions to determine if the problem is on my end (the client) or on the other end (the servers)?
The volume of requests precludes putting an analyzer on the wire - it would be very difficult to capture these few exceptions. I have reset CONNECTIONS and THREADS in my machine.config and the basic code looks like:
Dim hRequest As HttpWebRequest
Dim responseTime As String
Dim objWatch As New Stopwatch
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I am trying to Send an Email with an attachment (using Gmail) but I keep getting errors like "Operation Timed out" or Failure Sending Email". It was working earlier today but I found out that i needed to add Using statement because the email was having a file open that had to be deleted after it was sent but afterwards it doesn't work.
Here's what I have (Portion of it):
Private Sub SendMailOneAttachment(ByVal un As String, ByVal pass As String, Optional ByVal smtp As String = "smtp.gmail.com")
Using oAttach As Net.Mail.Attachment = New Net.Mail.Attachment((Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData) & "\" & My.Computer.Name & "_" & fName & " .zip"))
Dim client As SmtpClient = New SmtpClient(smtp)
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The ports are correct I believe, no firewall up on my PC...
I'm trying to convert code from Delphi to .Net. I'm stuck on one line:
//Delphi code ss := Copy(ss, Length(ss), 1) + Copy(ss, 1,Length(ss) - 1); 'vb.net code ss = ss.Substring(0, ss.Length - 1) + ss.Substring(1, ss.Length - 1)
Delphi combines the two substrings, while .Net just concatenate them like a copy.
I have a piece of hardware that is controlled via USB.There are 8 LEDs on the output byte. One LED per bit.I like to toggle the outputs based on selection of checkboxes and given frequency entered in TextBox.I inserted 8 checkboxes to allow me to select the desired LEDs to be on.I select the checkboxes to select the required LEDs.The checkbox gives me the byte value. XORing the byte value with 255I can see them toggling very fast. I have a while loop to blink forever until I click on stop button.The stop makes the seq=false and this should stop the blinking but it keeps going.How can I insert desired delay of flashing frequency in my output routine?How can I stop on demand to change pattern without exiting the program.
View 2 Repliesi need to download a file from a webserver on a regular basis ( every 5 minutes ), the url is something like url...
View 1 RepliesPrivate Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim req As HttpWebRequest
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I run a program with 20 threads getting data from web.
After about 10 minutes I keep getting operation timed out exception.
If I restart the program it works again for 10 minutes.
Looks like there is a memory leak or something.
Some says that webclient uses webrequest object somewhere. I do not see it in watch though.
I am trying to add functionality to automatically click the receive button if the Form1 is loaded.Even when i did not attach it to the timer the bCheckmail.PerformClick() did not work - Ideally this application will be loaded and check mail every 15 min.
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim Code As Integer
Dim Version As Integer
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Ok heres my idea Start(button)> start timer1 countdown> keypress> start timer2 countdown> keypress2> if keypress2 happend twice> then keypress3> loop> end>I understand the science behind it but I fail to grasp the knowhow of the program lang if anyone knows how this could be done in VB Express.
View 9 RepliesI'm trying to make a simple program that keeps track of a list of phone directories. It offers the option of adding new names to the directory and deleting names already stored.I want the program to display a small unobtrusive message when a name is added or removed.For example, a label that shows "James Potter added to directory..."and then disappears after a few secondsGoing through th file mentions the timer but it seems like an awfully long winded way involving a new control and a new subroutine for every single timed event. I was wondering if there's an easier way, perhaps a single command like:
View 16 Repliesim trying to make a short term ordering system for my major work for year 12 , i need to know how to run a timer in a label and progressbar at the same time , run by selections by combo boxes in another form.
View 7 RepliesI am working on a program to turn on devices at times of day and days of week. I am designing it for 15 devices and each device has a file. The problem I have is monitoring all 15 files. I can monitor each one and it works for that device, but only the device file I have called. I used data binding to create the files and can display the files one at a time, but I need to monitor the info on all 15 files actively.
View 3 RepliesI am trying to use a timer and stopwatches to control timed events and it's not working. This should be easy to implement and I don't understand why it's not working.
Code:
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
'hide label1 after 3 seconds.
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I have built a Windows Service and this runs great but what I would like to do is have this service check a website every 5 mins and ensure that a status code of 200 (Success) is returned.
checking aspect and the timing side of it.
I have a timed event that displays a balloon in the system tray. I would like this icon to remain active for 2 minutes or when the user closes it. When this time expires, the balloon should close and begin a function. I am having 2 problems with this:
1) The baloon icon is limited to between 10 and 30 seconds, when the user is active, so it closes to soon.
2) when the user is not active, the inactive time does not count agenst the timer.
I have some software that grabs information from a mysql server. However, users minimize it to the system tray, and leave it idle for hours until using it again.If a user leaves the program idling for about 15 minutes, then goes into the program again to perform a query, it throws a Fatal Error in the mysql, and says 'connection must be valid and open'
The reason is simply because the mysql connection has timed out..I was wondering what the code would be to re-connect to the server IF it has timed out.
How can I create a simple application to send timed controls to an external device?
What I need is to create a very simple application that sends control signals or voltages out to an external device connected via serial perhaps. The external device will in turn trigger some electromechanical devices. There needs to be 24 independent controls each with a simple command equivalent to on or off. What is important is being able to control the timings of the on and off on each control.[code]....
I'm trying to make a form that will read my wordlist. txt (one word or phrase per line) then using a timer, insert one word randomly selected from the list, and display it in textbox1 where it will remain until another timer changes the word. The word in the textbox will display for a random time 1min to 7 min, then the textbox displays another word randomly selected from the word list.
View 1 RepliesI am getting an intermittent "System.Web.HttpException: Request timed out." error when my code hits the line response.write():
sMessage = "Searching...0% complete."<br>
sSetVal = "<script>document.getElementById('MessageDiv').innerHTML='" & sMessage & "';</script>"<br>
Response.write(sSetVal)
Note that Response.BufferOutput = false is set when the page first starts executing (well before the above code executes).The code is used to update a progress message while other threads execute long-running processes. One thread runs continuously and checks the status of the other threads. As the other threads finish, this thread outputs updated status messages to the end user. I realise that this could (should) be recoded using ajax, but it is a legacy app and that is not an option at the moment.
This code is run 10,000+ times a day, and the error only occurs about 5 times - so I suspect the response object is being blocked by other threads when the website gets busy. However, I don't know which performance counters to check in the performance monitor. Or is this problem caused by something else? I am using IIS 6, asp.net v2 and vb.net?
What's the best way to implement the timed event / scheduled event? An application that incorporates the functionality of Windows Scheduled Tasks.
View 3 RepliesI am having two constants of 64 byte (X,Y) string type and a structure of 64 bytes with 5 parameters of different sizes like(1,7,12,20,14,10) no i have to xor operation with these three and store in a binary file. X XOR Y XOR Structure. the structure will be formed by taking user input values.
View 2 RepliesI want to Drag out an item from the program to the draged out Location ie. Desktop.
Mainly its a picture in a picture box that needs to be Draged and Droped from the program to the droped location on explorer
when I came across an error (The I/O operation has been aborted because of either a thread exit or an application request) regarding this code:
"Private Sub SerialPort1_DataReceived(ByVal sender As Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles SerialPort1.DataReceived
If closingdown = False Then
received = SerialPort1.ReadTo(vbCr & "R") 'Motion port receiving data. needs a vbCR & "R" is sensor out is an ASCII "R" followed by three characters(which is the distance measured)
End If"
It only occurred on "received = SerialPort1.ReadTo(vbCr & "R")".
However sometimes this error is not shown, but most of the time it does occur.
This error only occur when i want to close the form. Other than that it's perfectly alright.
I have a form called frmReport and on this form a user makes selections and clicks the "btnBuild" button which in turn creates a crystal report and displays it. However sometimes this process can take some time to build the report. So I placed a panel control along with a progress bar to let the user know that the system is working. However when the form runs the progressbar does not run until the last few seconds before the report is displayed. how to get the progressbar to "run" while the report is building ? (The progress bar is set to marquee.)
Private Sub btnBuild_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnBuild.Click
' Display panel control with progress bar
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