VS 2008 Port1.ReadByte() - The Operation Has Timed Out?
Feb 2, 2009
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"
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
"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:
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 [Code] .....
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"..
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.
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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
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) [Code] .....
The ports are correct I believe, no firewall up on my PC...
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:
I learn vb6 years ago but very limited. My goal is to get good with serial communications. I have bought the 2nd edition book of "Serial Port Complete".I wrote this code to send and receive data. Very crude yet I know. I'd like to display the number of bytes being sent in a label or textbox so the user can see the progress. Not sure why it doesn't work as I step through the For/Next statement. I send one text position at a time and have set the write buffer to one byte to help but no avail! [code]
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.
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.
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
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.
I'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:
im 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.
I 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.
I 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.
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.
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.
Dim Conn As New ADODB.Connection Dim rs As New ADODB.Recordset Conn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & "C:Documents and SettingsUserDesktopContribucionescontribuciones.mdb" rs.Open() rs.Open("SELECT * FROM master") rs.MoveFirst() TextBox1.Text = rs.Fields("sueldoanual").Value
I have this error The connection cannot be used to perform this operation. It is either closed or invalid in this context.
i have written a code bit for Pan operation for an image in Picture box. the code bit is as follows: Public Function PANImage(ByVal img As System.Drawing.Bitmap, ByVal PAN_X As Integer, ByVal PAN_Y As Integer) As System.Drawing.Image
[Code]...
I will be detecting the mouse co-ordinates and based on the difference between the co-ordinates from the point of left mouse button click, i will be panning the image. Now the problem is though the image gets Panned, the original image in the Picturebox (PBImage) is not getting cleared.
For iLoop As Integer = 0 To length Dim byte1 As Byte = Fs1.ReadByte() Dim byte2 As Byte = Fs2.ReadByte() Dim offset As Byte = Fs1.Position() If byte1 <> byte2 Then OffSetFS.WriteByte(offset) OutPutFS.WriteByte(byte2) End If Next Arithmetic operation resulted in an overflow.
This code is from [URL], so I assumed it would have worked, but I am probably missing something simple.
[Code]....
When I run this code, I get an InvalidOperationException (cross thread operation). How can I get my progress bar on the second thread, or does it have to be created at runtime on that thread?
I have created a DB connection, loaded my data grid and am looking to perform accumulation on the salaries that are shown. However it won't give me access to my grid view or the table for the Row.
This is the code that I have. The loop and the accumulator is at the bottom.
If rdoFullTime.Checked = True Then 'Dim con As OleDbConnection = New OleDbConnection("Provider=Microsoft.jet.oledb.4.0;data3
[Code]....
I tried to dim the Row as myDA.Row and myDataSet.Row and it won't allow me to and I can't figure out why. I know this deals with database but the problem is the logic not the database.
Dim f1 As String = "File1Path" Dim f2 As String = "File2Path" Dim Fs1 As New FileStream(f1, FileMode.Open) Dim Fs2 As New FileStream(f2, FileMode.Open) Dim f1length As Integer = Fs1.Length - 1 Dim f2length As Integer = Fs2.Length - 1
[Code]...
Application.StartupPath & "PatchData.dat": PatchData.dat isn't created yet, but my program makes PatchData.dat, and PatchData.dat is ~8KB when my program gives me this error.
I have written a simple VB.net application which saves information to an RFID tag. I am now trying to compress my data. The solution I have come up with involves bitwire operation.Basically I store 2 numbers per 1 byte (0-9, 10 being a period, 12 possibly being a negative/positive flag,13,14,15 unused as of yet).The code I am using basically shifts the byte containing a number left, 4 spaces, then 'OR's it against another number.Therefore 12 is now represented as 00010010. The problem i'm having is decompressing. Obviously getting the '1' back is easy, as I just shift right 4, then grab it. I need to append or remove the last 4 bits.My solution after many headaches was to reverse the bit order, shift left 4, then reverse, then tostring it.
