Int64 Not Working Above 2^53?
May 19, 2011
In working with large prime numbers, I appear to have stumbled on a problem. Powers of 2 are showing up okay, but when I try to add or subtract from them, I get erroneous results. Below are the powers of 2, minus 1, for exponents 51 through 56. Notice that, starting with exponent 54, The resulting number is even, which is obviously incorrect. I used data types INT64 and UINT64 and got the same results for each.Here is my code and a partial list of the results:
Dim i, iTest
As UInt64
rtbIsPrime.Text = ""
[code]....
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Apr 4, 2011
Be it in 32 or 64 bit system?
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Sep 24, 2010
How can I convert IntPtr to Int64?
vb
Convert.ToInt64(GetForegroundWindow())
error :Unable to cast object of type 'System.IntPtr' to type 'System.IConvertible'.
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Dec 21, 2009
Im reading data from a VB random file.
Using dim value as int64, the output is: 4674762526611734528 Using dim value2 as date, then converting to dateticks, the value is 627740064000000000 The actual date is: 26/03/1990
Why is the int64 value not the same as the dateticks value?? How do I convert the int64 value to dateticks value?
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May 13, 2009
what does the convert command do in vb.net? and could you tell me what difference is between int32 and int64?
for example
dim h as integer
h=convert.toint32(textbox1.text)
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Feb 3, 2011
Will that detect whether the integer should be int64 or int32? What about if we run the program twice. Once we use small numbers and latter we'll use big numbers?
Let's look at this for example: vb.net Dim vector1 As List(Of Int64)Dim vector2 As List(Of Int64) vector1.Sort()vector2.Sort(Function(x As Int64, y As Int64) As Int64Return y - x
What about if I do: vb.net vector1.Sort()vector2.Sort(Function(x As Int64, y As Int64) As Int64Return y - x
[URL]
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Sep 3, 2009
I found on msdn samples and modified (add Thread.GetDomaind.UnhandledException)
<SecurityPermission(SecurityAction.Demand, Flags:=SecurityPermissionFlag.ControlAppDomain)> _
Public Sub Main()
' Add the event handler for handling UI thread exceptions to the event.[code].....
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Jun 18, 2009
It appears that my favorite thing in the world is tackling projects that are beyond my current knowledge and abilities. I have a little project that I am working on which is a simple image viewer stocked with (upon completion) your standard Load..., Next/Previous, Zoom In/Out, Actual Size, and Full Screen capabilities. However, I am running into a few snags:
(1) I've been able to get my "Load..." button to display a file dialog box, but I cannot seem to get a working filter (with which only image file types are allowed to be selected) in working order.
(2) I have a PictureBox object (entitled PictureBox1) that displays the image selected via the file dialog box, but it loads images in their full size (1:1/100% zoomed) state without scrollbars, etc. to allow me to navigate the loaded image. I would like to have it load the image, initially, to fit within the dimensions of PictureBox1 and from there be able to zoom in/out via my "Zoom In/Out" and "Actual Size" buttons and be able to scroll if the zoom level is beyond the dimensions of PictureBox1.
(3) It dawned on me that I haven't the faintest idea how to get my "Next/Previous" buttons to allow the user (me) to navigate, in succession, the images contained in the folder in which the currently loaded image is stored. [code]
If it is deemed that this thread is inappropriately requesting help, I ask that it be locked/deleted quickly as I recognize that this is a large community with many discussions going without need of unwelcome posts.
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Jan 19, 2012
I'm using loop to read data from sql and then make some calculations then save it again to another table but when application loop for 3 or 4 times it's freeze but the job is done but if loop = 10 or more then it is freeze and hangup for long time .i need to learn how to make my application working better and never freeze and make application working with any count for loop without freeze .
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Jul 14, 2010
I can't understand why this is not working.
[code]...
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Mar 28, 2009
I am moving over to vb.NET and am experiencing the learning curve. Am learning quickly, but I do have a question for anyone who can respond. vb6 could be made to run much faster by going after the GDI API directly, rather than going through vb6's standard wrapped functions like Line(), and Circle(). Now that I am working with vb.NET and GDI+, as far as I can tell there is no wrapper anymore and you hit GDI+ directly "right out of the box". Is this true? It looks like trying to phenagle the old vb6 API code can't work because .NET does not use GDI anymore...it uses GDI+ via the System.Drawing namespace.
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May 19, 2012
I'm developing application using RS485.
Which is working fine when i debug from project itself but when i run after building .exe it is not getting any reply back.
After some try and error i found that RTS(Request to Send) is the reason behind this problem.
Port.RtsEnable = True
Port.Write(DATA)
Port.RtsEnable = False
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Jul 31, 2010
I added FileSystemWatcher in Form1_Load like this -
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
....................
[code]....
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Apr 26, 2010
I can't figure out why my addhandler is not firing?In the Sub "CreateTagStyle" the AddHandler is not firing when the LinkButton is clicked Is there some reason that addhandlers can't be added at certain points of the page lifecycle?
<%@ Page Title="" Language="VB" MasterPageFile="~/_Common/Admin.master" %>
<script runat="server">
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
[code]....
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Oct 4, 2011
I am using the CustomValidator for the first time but it doesn't seem to be firing DateExpireRequired_ServerValidate and just runs the code in the Click action.Been bugging me for a couple hours now! can anyone see a problem with what im doing?The DropDownList in my code below is populated using Roles.GetAllRoles()
ASP.NET
<asp:Label ID="lUserRole" runat="server" AssociatedControlID="tUserRole">User Role:</asp:Label>
<asp:DropDownList ID="tUserRole" runat="server" CausesValidation="True">
</asp:DropDownList>
[code]....
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Apr 6, 2010
I'm trying to get get the short filename from a long filename but I'm having problem in c# code. VB.Net code is:
Declare Function GetShortPathName Lib "kernel32" _
Alias "GetShortPathNameA" (ByVal lpszLongPath As String, _
ByVal lpszShortPath As String, ByVal cchBuffer As Long) As Long
[Code]....
But I cant get the c# version work. Am I missing something or what is wrong?
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Jul 28, 2010
I have a Class Library that is exposed to COM like this:
<ComClass(SomeClass.ClassId, SomeClass.InterfaceId, SomeClass.EventsId)>
Public Class SomeClass
Public Const ClassId As String = "GUID1"
Public Const InterfaceId As String = "GUID2"
[Code]....
Compile error:
Function or interface marked as restricted, or the function uses an Automation type not suppport in Visual Basic.
What do I need to do to properly expose this Method so I can use it like this?:
SomeClass.SomeMethod 1, 2, 3
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Sep 29, 2011
I have an SQL command I am attempting to execute.The syntax is as follows
[Code]...
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Mar 25, 2012
I'm using the ZipForge to extract an archive in VB.NET.When I run the code I get no errors, but it doesn't extract any of the files. This is the code I'm using:
ZipForge1.FileName = "Archive.zip"
ZipForge1.OpenArchive(FileMode.Open)
ZipForge1.BaseDir = "C:Extract"
ZipForge1.ExtractFiles()
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Oct 8, 2010
I'm getting an ArgumentOutOfRange error when using substring function in .NET. I'm new to .NET so probably doing something wrong. I have a txtField, which is a text field component in GUI. I'm using Microsoft Visual Basic 2010 Express
txtField.Substring(txtField.Length-4,txtField.Length-1)
If txt.Field contains only numberic values it works ok, but as soon as the text field contains characters it breaks.
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Nov 19, 2009
I have a COM dll that has been developed under vb.net. The Control works just fine in IE 6 and IE 7, but when IE 8 tries to load the control, the browser crashes. I look at the event viewer and I get an error 1000 about iexplorer.exe and mshtml.dll. Do I have to build this com dll with IE 8 on my development machine? How can I track down what is wrong with the Control?
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Sep 23, 2009
I created an activex in vb6 and used it asp.net. It work perfectly in ie6 . But not working in ie8 . No errors showing. In security setting I enabled activex option just like i changed in ie6. Only the small square i can see in ie8.
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Jul 27, 2009
According to all posts I have seen, this shold work, but of course it doesn't, does anyone see what is wrong....
DBF is on C: emp est.dbf
Dim DB As New ADODB.Connection
Dim RS As New ADODB.Recordset
[Code].....
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Jul 8, 2009
Can someone please show me an example of how I would start a timer when viewing another window such as Mozilla Firefox? I would prefer it be started with a keystroke.
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Aug 19, 2011
I have developed an application is VS2010 ( VB app using .NET4 ) ... the application runs fine under Windows 7 and on (3) XP machines we have here. Had one user looking for support on an XP machine ... when he started the app nothing happened. No errors or anything, just nothing happened. Had him install the latest .NET4 framework and everything was fine.
Just had another support issue ... user with the same complaint ... had him install latest .NET4 ... but this time did not fix the issue ... still nothing happens when he clicks to start the app ... no errors ... just nothing happens.
I can't check this because it runs on all our XP machines .... Is the only criteria that .NET4 be installed? I created an install that includes only the EXE from the BINRELEASE folder ... nothing else. Do I need anything else. Strange that it works on all our XP machines.
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Jun 22, 2010
my application required the dropping of resources when a button is pressed.It seems when this button is pressed on XP everything works swimmingly, however...
on windows 7 and vista the button simply dosent do anything, ive tried elevating to admin etc..
Is it possibly due to how it creates/drops resources?
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Jun 25, 2010
I have an ASP PasswordRecovery module on a page, the code comes up like this:
<asp:PasswordRecovery ID="PasswordRecovery1" runat="server">
<MailDefinition From="[email]">
</MailDefinition>
</asp:PasswordRecovery>
However, when I submit the form I just get the message, "We were unable to access your information. Please try again."I saw this question and made sure to add those attributes to my web.config here:
[Code]...
I added a break point in this function but it is never reached, the above error message just comes up in the app. Any other ways to debug what's going wrong?
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May 28, 2011
I have a CustomValidator that checks if text entered in textboxes matches certain fields in a database. This was all working great before, but I have modified my page quite a bit since then and it is no longer working. I didn't think I changed anything that would affect this, but apparently I did. All my other validators (required field validators) are working correctly, but my CustomValidator isn't responding.So anyway, here is my code:
CustomValidator:
<asp:CustomValidator ID="CustomValidator1" runat="server" ControlToValidate="txtCoursePrefix" ErrorMessage="Course number is already taken."></asp:CustomValidator>
[code]....
Everything is working up until CustomValidator1.SetFocusOnError = True and args.IsValid = False. I have tested the If statement and it's working correctly, it returns true and anything else I put inside of it executes.
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Jan 5, 2011
The event is simply not firing, what am I missing? Code for the button:
[Code]...
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Jul 29, 2009
I have a SharePoint web part with a web-browsable property that stores a password. I've decorated the property with the PasswordPropertyText attribute but whenever I edit the web part it shows the actual password rather than dots or asterisks. Here is my property declaration:
<Personalizable(PersonalizationScope.Shared), _
PasswordPropertyText(True), _
WebBrowsable(True),[code]......
Does SharePoint 2007 respect this attribute, or am I just not using it correctly?
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