VS 2008 IP To Country: Probable I/O Race Condition Detected While Copying Memory?
Jun 7, 2012
im having problems with IP To country code, it checks country on .dat file, and it gives this error.Probable I/O race condition detected while copying memory. The I/O package is not thread safe by default. In multithreaded applications, a stream must be accessed in a thread-safe way, such as a thread-safe wrapper returned by TextReader's or TextWriter's Synchronized methods. This also applies to classes like StreamWriter and StreamReader.
My
Dim country As String = Me.geo.lookupCountryName(DataGridView1.Item(1, count).Value)
DataGridView1.Item(4, count).Value = country.ToString
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Jan 21, 2012
I use a worker thread to do the procedure of query and fill the datasetAnd I use 3rd party component called DevExpress XtraGrid: GridControl to view the query outputI don't forget to use invoke and delegate to set the GridControl.datasourceOn Timer.Tick(), the thread is started and the procedure is called user has scrolled down the GridControl, even only one scroll value instead,and then the Timer.Tick() fired, I gottwo errors randomly. Mostly aNullReferenceException error and eventually anInvalidOperationException error
************** Exception Text **************
System.NullReferenceException: Object reference not set to an instance of an object.
at DevExpress.XtraGrid.Views.Grid.ViewInfo.GridViewInfo.UpdateCellAppearance(GridCellInfo
[code].....
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Mar 30, 2009
I have a legacy data table in SQL Server 2005 that has a PK with no identity/autoincrement and no power to implement one. As a result, I am forced to create new records in ASP.NET manually via the ole "SELECT MAX(id) + 1 FROM table"-before-insert technique.Obviously this creates a race condition on the ID in the event of simultaneous inserts.
What's the best way to gracefully resolve the event of a race collision? I'm looking for VB.NET or C# code ideas along the lines of detecting a collision and then re-attempting the failed insert by getting yet another max(id) + 1. Can this be done?
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Apr 23, 2012
I have a query (qryTallyMedalInformation) that i bound on datagridview and it has 5 columns ( country, athlete, medal, game and date). Instead of having country in the datagrid, I want to use it in a combobox to display records base on country selected.what i did (with wizard) doesnt work fine though. My country combobox shows duplicate data and the datagrid is showing all the records from different country. In one word I JUST DID NOTHING.
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Feb 18, 2012
Suppose I have a function that accepts a string as parameter. But the parameter has a limited number of values (i.e. I've defined the function to work with only say, four exact strings). What I want is that when the user types the name of the function and starts the parentheses, the intellisense will show up giving the values that are defined in the function. Its just like a function that accepts a boolean parameter. The intellisense shows up giving the two values "True" and "False" when using the function.
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Mar 18, 2010
New one on me. RaceOnRCWCleanup was detected happens when I close my application. The complete error was:"RaceOnRCWCleanup was detected Message: An attempt has been made to free an RCW that is in use. The RCW is in use on the active thread or another thread. Attempting to free an in-use RCW can cause corruption or data loss."
I found a link for the error here[URL]...34(VS.80).aspx . That either went screaming over my head, or it is like listening to politicians, a lot of words that don't mean much.
My best guess is that I added a WMI query that runs periodically in a background thread, thinking that because it was a background thread I had nothing to worry about. I added some code to close the background thread before the application closes and so far,
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May 27, 2009
I cannot use Visual Basic 2008 at all. When I go to "new project" and choose "Windows Form Application" I get this error.I have tried multiple uninstall/reinstall with no result.A microsoft reply to this suggested that I needed: " .NET Framework 2.0 Service Pack 1 " I checked, and I did not have the .netframework 2.0 service Pack 1.
When I tried to download and install the above from Microsoft.com, the istaller said that "it was not allowsed" and I was not able to install the service pack 1.
I tried Uninstalling net framework 3.5, 3.0, 2.0 and then reinstalling .netframework 2.0 sevice pack 1; then reinstalling Visual basic 2008 express edition. At the reinstall of Visual basic 2008, .netframework 2.0 sevice pack 1 is unistalled by .net framework service pack 2.When I check the foruims for simiar problems, the formus are mostly for Visual basic 5.0, or other programs that I do not have.
Here is the programs I have installed:
Operating system: Windows XP
Microsoft .net framework 1.1
Microsoft .NET framwork 1.1 Hotfix(KB928366)
Microsoft .Net Framework 2.0 Service Pack 2
[code]....
All the security updates and hotfixes for Widows XP.
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Aug 1, 2011
For a race, I am trying to evenly disperse the heats for smaller race groups within those of larger race groups. I do not want the smaller groups to finish too early and I am also trying to minimize groups running back to back heats.
As an example:
Group A has 4 heats
Group B has 2 heats
Group C has 1 heat
The resulting schedule would look something like this:
A1 B1 A2 C1 A3 B2 A4
To complicate things, there could be any number of race groups and each race group can have any number of heats.
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Dec 29, 2011
Basic out line connecting to an irc server. We connect to this server using a TCP client on a separate thread from the UI. Now the raw numeric for the MOTD is "372" so when our streamreader reads this value from the worker thread it raises it's value and displays it to a RTB. Now my issue. When i connect to a server i wait till raw "372" before i check to see if i need to join a channel. But a lot of servers have more then then one line MOTD each sending there own "372". So if a server has a long MOTD that could mean over 100 "372".
Now while it does not effect the UI of my app i wish to move the "372" to it's own thread from the current worker thread. But thats the problem. How do i move the MOTD to it's own thread when it's still being read.
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Jan 23, 2009
I have been given an assignment for my VB.Net class. Basically,given the race car's weight, horsepower and distance traveled,determine the time.I am going a couple of steps further...
(1) I am including two pictures of competing race cars at the staging area and a short track to travel (makes the assignment more interesting). I would like to know if it is possible to provide an animated light sequence of the Race Tree (staging lights, 3 sets of amber lights, and the green light) with a timer activating the start of the race.
(2) I would also like to incorporate a "sound" track of a race car as the two race cars proceed to the finish line. I realize that the user may enter any distance for the race. Regardless of the amount of time it takes to run the track (if given a long distance),I'm going to calculate the total time to span just 15 sec. Again, I would like to know if it's possible to incorporate these two
separate modules into my program using the Window's form application?Also, what resources should I study to gain knowledge on how to
execute the two modules?
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Apr 22, 2009
I have a copying error with my program. I am trying to copy the internet cache folder, and the error states that some files cannont be copied (read only maybe?) How can i make it copy, or just skip the uncopyable files?
My.Computer.FileSystem.CopyDirectory(Environment.GetFolderPath(Environment.SpecialFolder.Internet Cache), "d:My Documents")
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May 5, 2005
how to resolve country name from ip address.
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Oct 20, 2009
I have add,update,delete buttons on my form.A message box should appear on the screen "should have values to Add/delete/update/" if user clicks on Add/delete/update buttons without having any values in the textfiled,i have around 20 text fields on my form.
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Oct 18, 2010
I was create a web services(Ip2Country)
i send my visitor Ip to this service and return his/her country information(like US|USA|United State of America)
and it's work correct.
BUT if our visitor connect useing (vpn or proxy) it does not work correct
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Mar 24, 2009
Dim hostname As IPHostEntry = Dns.GetHostEntry(TextBoxIP.Text)
Dim ip As IPAddress() = hostname.AddressList
TextBoxIP.Text = ip(0).ToString()
I have a windows form with the code above to get the ip address of the user. what would be the easiest way to get the country location of the user? based on the IP in the textbox. The solution doesnt need to be 100% accurate but good enough to work most of the time. the simpler the better.is there are any work arounds or built in fuctions for pulling a users country or language, this would be better than creating or managing a giant database.
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Jan 20, 2009
I have the following code which reports the users Ip address but need to display another textbox which the country of the IP belongs to.[code]...
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Sep 3, 2010
I have written simple code to determine country location using the suffix on the url eg..cn, .se, .br etc. even if its possible to determine country or location using urls that end in .com or .net? I was just reading up on something and found online apps that can determine location/country from the ip so how would I determine the ip or look it up using the url? can I do this in .net?
OK
So I have the following code and I get an exception when the url is invalid or faulty, can anyone help me to catch the error and add the url to another list and continue with my loop.
Public Sub getIpAddress(ByVal querylist As ArrayList)
Dim IPList As New ArrayList
Dim badList As New ArrayList[code].....
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Feb 12, 2012
I'm trying to get user's country and continent, in VB.NET.
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Nov 20, 2010
I have a csv file with countries and their IP ranges. The numbers are numeric representations of the dotted IP address, calculated with the following formula.[code]...
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Jan 19, 2010
In my program, I have a condition I need to constantly check for. When my program gives an error, I change a label to a different text, lets say "fail" for now. I'm trying to make a condition where the program constantly checks for the label change to "fail" from the start of the program. I am having trouble trying to get this to work.
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Nov 9, 2009
Is it possible to use a button click event as a condition? Maybe set a bool flag to true if someone clicks it?
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Sep 11, 2010
i want to know how to convert a string to if condition exmample
dim myExpression as string
myExpression = "if a>b then" & _
" MessageBox.Show("beware from dog !")" & _
"end if "
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Aug 8, 2011
how to add other version of .net framework. like 1.0 or 1.1 .net framework here is my problem i deploy my application, when i install, it always say to download or install the .net framework. i want to run my application under windows xp cause our client does not update their machine.
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Nov 15, 2011
Vb.net I tried to rearrange the DGV Rwos but I don't know how to complete it. as it show in the code ( my request in green line)
vb
Public Sub rearrange()
For Each row As DataGridViewRow In Form1.DataGridView1.Rows
If Not row.Cells(1).Value Is Nothing Then
[code]....
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May 2, 2012
I have a active report and I need to group it on my country attribute. I have been looking around on the active reports API and came across grouping. Is this the best way to do this and how do I go about doing this?
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Jul 28, 2010
My aim is to choose a value from Listbox1 and on Listbox2 I would like to display the corresponding value from a table in my database. I mean, when I select Product A from Listbox1 (which is getting its values from row "Model" in my database table), I should see its price on Listbox2 which is available in the "Price" row of the same table (and also manipulate this price in different places for calculation etc.) . I am not sure if the best way is using "databinding.filter".
Here is the code I have but I cannot making it work:
Dim dtCOP As New AmetailorDataSet.COPDataTable
Dim adapterCOP As New AmetailorDataSetTableAdapters.COPTableAdapter
adapterCOP.Fill(dtCOP)
[code]...
A small note: my aim was using a Richtextbox instead of Listbox but I am told that Richtextbox is not suitable for using with datasources.
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Sep 8, 2009
I have a form with Check Boxes on it and a second form that holds functions and a Backgroundworker.When a button is pressed on the first form, the second form loads and then runs the functions that relate to the appropriate Check Boxes.Doing it this way causes the second form to become inaccessible. I decided to run my code in the Backgroundworker's DoWork event and then call the RunWorkerAsync method in my form's Activated event. Before using the Backgroundworker, everything worked fine and now it doesn't.I assume the issue is with the Backgroundworker not being able to access controls on another thread.In debug mode,it automatically throws an exception, but doesn't error out when using the Release version, making me assume it's a legal call. But, if it's a legal call, then why can't I access the controls?
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Jun 21, 2010
I am able to have checked menu items show the variables that I need to show, but they don't uncheck themselves unless I go back and click them. I want to have only one checkmark on a country at a time...is there any way? I've tried if...elseif , but that doesn't work....example below (If I only want Mexico checked and NOT United States, but both are checked still).
If MexicoToolStripMenuItem.CheckState = CheckState.Checked Then
UnitedStatesToolStripMenuItem.CheckState=CheckState.Unchecked...
End IF
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Mar 25, 2011
I know you can get a currency symbol or a data format for a country using System.Globalization. However, is it possible to get the phone number format for a country from it as well. If not is there a way to get this information from the .NET Framework?
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Jul 24, 2011
I've searched around but can't find a clear answer for this. From my winforms VB2010 app, I'd like to be able to detect the country of the user's PC at runtime. Specifically, all I really need to detect is whether the user is in Australia or Canada.Most things I've seen will say "have a look at System.Globalization.CultureInfo", but with no clear example. I also know that the old-school "GetLocaleInfo" API can be used for this as well. I do have some code using the latter, which detects Australia when LOCALE_ICOUNTRY returns a value of 61. However, that won't work for Canada, as it returns 1, which is the same as USA (I know that these are based on telephone country codes).
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