If I had 5 text boxes on a form, TextBox1...TextBox5, is there a method to do something like this?
Dim strFld As String
For intFor = 1 to 5
strFld = "TextBox" & intFor
Me(strFld).Text = intFor
Next
It doesn't like the line of Me(strFld) but I figure there must be a way to reference a field via a variable instead of hardcoding the field name.
I've got a couple of these NumericUpDown controls I put on a form. Without describing too much about the form I basically want to update some variables each time one of these NumUD controls changes value. So for each NumUD I have a call to a Recalculate subroutine within their "changedValue" event.
There are actually two problems. First, if I initialize the "Value" property to something other than zero in VB2010 at DESIGN TIME it won't even open the form when I hit RUN. It gives me a "No Source Available. No symbols loaded for any call stack frame" error. The error box says "InvalidOperationException" was not handled. So if I try to set the initial value of the Value property to anything but zero of either I get this error.
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I am trying to program a Yahtzee game. I would like to use a random number (out of a six sided die) and show the appropriate dice image based on the number generated. I have six predefined pictureboxes that each have a side of the dice image. I want to mimic the picturebox based on the number received.
For example:
x = Int(1+Rnd()*6)
die1.Image = diex.Image
Where x would be the random number and would pull from the appropriate picturebox.
Can some one please be kind enough to link me m$ naming guide lines.
View 2 Replieshow many variables and controls (i.e. text box, listview, buttons, etc) can a VB program has without slowing down its performance?
View 2 RepliesThis code passes a button name ("Button2") and a value (4) to be displayed on it. Can the "UpdateButtonName" procedure be streamlined by replacing the "For Next" and "If Endif" code with something else since the button name is already known? It shouldn't have to check control on the form to see if it is the one I want.
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
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I was looking for a way to enumerate String types in (vb).NET, but .NET enums only accept numeric type values.
The first alternative I came across was to create a dictionary of my enum values and the string I want to return. This worked, but was hard to maintain because if you changed the enum you would have to remember to also change the dictionary.
The second alternative was to set field attributes on each enum member, and retrieve it using reflection. Surely enough this worked aswell and also solved the maintenance problem, but it uses reflection and I've always read that using reflection should be a last resort thing.
So I started thinking and I came up with this: every ASCII character can be represented as a hexadecimal value, and you can assign hexadecimal values to enum members. You could get rid of the attributes, assign the hexadecimal values to the enum members. Then, when you need the text value, convert the value to a byte array and use System.Text.Encodings.ASCII.GetString(enumMemberBytes) to get the string value.
Now speaking out of experience, anything I come up with is usually either flawed or just plain wrong. Is there any reason not to do it like that?
As pointed out by David W, enum member values are limited in length, depending on the underlying type (integer by default). So yes, I believe my method works but you are limited to characters in the ASCII table, with a maximum length of 4 or 8 characters using integers or longs respectively.
I am trying to write a simple linq query from a tutorial I read. But i cannot seem to get it to work. I am trying to display both the address in the attached xml document, but can only display the first one.
<?xml version="1.0" encoding="utf-8" ?>
<Emails>
<Email group="FooBar">
<Subject>Test subject</Subject>
<Content>Test Content</Content>
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I am trying to get the AD Properties from a Search that I do. When I do so I get this as a result "System.DirectoryServices.ResultPropertyValueCollection". How do I get the value? I know that it is a collection but everytime I try I am not successful.
Code:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdSearch.Click
Dim resEntry As SearchResult
Dim lstItem As New ListViewItem
Dim currentEntry As New DirectoryEntry
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I'm having trouble with program I'm writing for work. It's basically a GUI for some remote management scripts I wrote a while back.I have a listbox (listbox1) to which loads a list of computers from active directory, which works perfectly and quickly.The problem is that I also want to add to another listbox (listbox2) a list of machines 'currently active' on the network. I can't see an easy way to do this in .net but came up with a logical solution.Basically my thought was to 'ping' all of the machines in the directory listing and use the results to make the list...
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim de As New DirectoryEntry()
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Is there a way to write a single routine that could enumerate a list regardless of the data type? I am trying to write a custom XML serialization class and it would be great if I could enumerate all items in a generic list the same way, regardless if it was of type String, Integer, etc.
View 5 RepliesI have some code designed to locate a specific process based off of its window text, gather the main handle, and then all of the child windows. However, I have run into one problem. I cannot seem to gather all the handles and their respective text. For example, when I test my program and do a handle count on the specific process, it tells me that there are more than 400 handles for this one process. How do I get the handle pointers for this process and also gather the text associated with these handles.I have included my source code for reference.
Code:Public Class Form1
Const GW_CHILD As Integer = 5 Const GW_HWNDNEXT As Integer = 2 Const WM_GETTEXT As Integer = &HD Const WM_GETTEXTLENGTH As Integer = &HE Const BM_SETSTATE As Integer = &HF3 Const WM_LBUTTONUP As Integer = &H202 Const WM_LBUTTONDOWN As Integer = &H201
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I have some code designed to locate a specific process based off of its window text, gather the main handle, and then all of the child windows. However, I have run into one problem. I cannot seem to gather all the handles and their respective text.
For example, when I test my program and do a handle count on the specific process, it tells me that there are more than 400 handles for this one process. How do I get the handle pointers for this process and also gather the text associated with these handles.
I have included my source code for reference.
Code:Public Class Form1
Const GW_CHILD As Integer = 5 Const GW_HWNDNEXT As Integer = 2 Const WM_GETTEXT As Integer = &HD Const WM_GETTEXTLENGTH As Integer = &HE Const BM_SETSTATE As Integer = &HF3 Const WM_LBUTTONUP As Integer = &H202 Const WM_LBUTTONDOWN As Integer = &H201
[code]....
Is there a way to list the text that appears in each of the tabs of IE8 and Firefox as part of the list of running processes along with the handle.I can list all the running processes fine with their hwnd's but I cant list all of the tabs that are open in either IE8 or Firefox, only the active tab
View 1 RepliesI need to enumerate all the items in an email inbox. However, this code fails
For Each MI As Outlook.MailItem In folderToProcess.Items
'Console.WriteLine("Subject:" + vbTab + MI.Subject)
Console.WriteLine(MI.Subject)
Next
It fails whenever it comes across an item that ISN'T an email (e.g. a meeting request). I've spent the last hour or so trying to find a way of enumerating every item no matter its type. So far all I've come up with is to use the base Object type and then work from there but that's Late Binding and I'd prefer to avoid it if possible.
Has anyone come across this problem before? How can I determine what type of Outlook item it is during enumeration?
As part of my application I am hoping to be able to get the user to enter their IP address and subnet mask which will then enumerate all of the hosts in between which can then be scanned for various open ports/applications installed.
For instance, With a network of 10.91.100.0/255.255.255.252 hosts are valid 10.91.100.1 - .2
How can this be done in vb.net? I would assume also some error checking would need to be put in place to confirm as to whether the subnet mask was valid as well?
I am trying to come up with a good way to enumerate hard disks on remote workstations, possibly including administrative shares, so I can audit key files on them without having to access them via sneakernet.I have domain administrator rights. Security policy prohibits using WMI which would be a great solution.I can retrieve a list of computers using Active Directory, but I need some way to determine what drives are available on each system. Is such a thing feasible? A fellow developer offered some VB6 code from years ago that used WNetOpenEnum, but I was hoping that since we are at .NET framework 4, maybe there's a more elegant / managed way of working with this. I'm keen to use technologies that are more generally supported, such as standard APIs etc. WMI is a great solution but apparently is blocked by default by Windows Firewall, so its availability is not guaranteed.
View 2 RepliesI have need of either enumerating all the managed threads in a application or listen to when a new thread is created. I can not find anyway to do this through searching the web. It strikes me as odd the the IDE can list all the manage threads, but I can't.
If this is not possible, is there clarification as to why this is not possible.
I need to create a shared class in a DLL that will when it receives a signal will stop all the threads currently running, and gracefully exit the application.
Here's my code:
Code: Public Sub ProcessInbox()
Dim oOutlook As New Microsoft.Office.Interop.Outlook.Application Dim oNs As Microsoft.Office.Interop.Outlook.NameSpace Dim oFldr As Microsoft.Office.Interop.Outlook.MAPIFolder Dim oAttachments As Microsoft.Office.Interop.Outlook.Attachments Dim oAttachment As Microsoft.Office.Interop.Outlook.Attachment Dim
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If I change the following line as shown, it works OK:
Code: Dim oMessage As Object
Is this the best way to get it to work or what should I specifically define the variable oMessage as?
|+--JDMils|+--VB6 & XL VBA+--VB Dot Net 2K8|
Last year (2010) I came across a FANTASTIC command that allowed me to take a string of variables with a common delimiter and break it all back out into separate variables (possibly an array) with one statement.
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As long as the delimiter was a unique specifiable character, this one-statement command could break it out into elements. my memory and point me in the right direction.
I have code, shown below, that works all except for 1 thing: The variables being passed byRef get passed, but once modified in the else section of the "if me.invokerequired" code of RecordData, the variables are never updated in the calling function. To reiterate, the calling function does not receive the updated data that is in the variables custid and amt.When debugging, I see the data change in the else section of "if me.invokerequired", but once it returns from the callback the data is missing.[code]
View 15 RepliesI define some global variables of a class as follows:
Private Class MyClass
Private var1 as Decimal
Private list1 as List(Of string)[code].....
But I found that after this form is closed, all above variables, var1, list1, list2 still exist in memory. I thought they should be collected by gc since the form is already disposed as I confirmed.
Add: I have monitored half an hour after the form is closed. But these variables are not collected by gc. I have an automatic update procedure on the form which uses above variables.Since the above variables still hold values, the automatic update procedure is always called which causes exception. (One quick fix is to check if form.isDisposed in update procedure. But I do not think this is elegeant. Besides, these variables occupy memory.)
Does the memory used in declaring variables are reclaimed by the OS when these variables go out of scope?Does the memory used be released by setting thier value to nothing? if not, then how can I force the garbage collector to run or excecute at a certain/desired time..How about in Windows Forms..How can we make sure that the memory used in initializing and showing forms be released if those forms were closed?
View 13 RepliesQuestion 1: What is the difference between "Background Worker" and "Worker Pool" as indicated within the MSDN samples provided.
Question 2: I noticed while using, AddressOf _Function_, variables cannot be passed; what would be an efficient solution to this?
Question 3: While using multithreading is it required to invoke before setting variables, or only form properties?
Question 4: While using System.Net.Sockets is it safe/efficient to use Application.DoEvents while waiting for new data; or would be using a Do While loop be fine without DoEvents since the action would be multithreaded? Note: there can be up to 2000-3000 sockets in use at a time.
I'm new in .NET programming.I have a class Form1 that includes Button1_Click event.Button1_Click creates a multiple Text Boxies at run time)Here is the class:
Public Class Form1
Dim shiftDown As Integer
Dim counter As Integer
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I wanted to know if anyone could tell me how to access the Click_event.I have a boarderles form with a panel control which has the Dock property set to fill and on the panel I have placed a Label also with the Dock property set to fill. I also have a timer running.How can I get code to execute in the Label1 click event.I've tried doing it by using the generic Click_event and also with two variations of the Click_event Handles parameters
'Alternativ 1:
Private Sub Form1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Label1.Click
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There is newer code in a follow up post. I suggest using the code in the later post rather than the code in this one. You can still read this post though. When designing a user interface, one should be conscious of how many individual controls are required to implement the functionality. In some cases an initial design may begin with many buttons or textboxes (for example) but then further review of
the actual required functionality allows for a reduction in the number of unique controls.
But other times, there isn't a better way (which will still make sense to the user of the application) then to have a series of many repeated controls. So in the cases where one can be certain that the best UI implementation for an application will require the use of multiple copies of a given control, then it often becomes necessary to maintain some method of managing all of those controls at various points
throughout the application. Doing so typically requires that one build up some collection of controls which can then be accessed by index in order to work with any given control; but this can lead to a lot of clutter in the code file which handles these control's events. For instance there will be some kind of collection declaration, some recursive routine to find all of the controls of interest, and then any number of event handler methods with long lists of Handles clauses, or additional code loops to wire up the event handling for each control.
Purpose Since most of this functionality could be considered a requirement regardless of the type of control being managed, or its required functionality, it may make sense to wrap all of the control management functionality into a single class. And since our first requirement is a collection of controls, then a base collection class could be the perfect starting point for our control manager. There are a number of existing thread around this topic, with some recent (at the time of this writing) ones being:[URL]..In this, and related, threads I have posted examples of a simple TextBoxManager and ButtonManager control. But again, with so much similar functionality required regardless of the control being managed, it would be technically possible to create a generic ControlManager(Of T As Control) class which can manage any type of control.
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So in summary, one can facilitate managing a large number of user interface controls by building a "control manager" class which both encapsulates the list of control instances, and deals with adding and removing defined event handlers for every control it manages. The generic control manager class itself can be inherited and extended into a more specific class on a per-application basis in order to provide more application-specific functionality. Reed Kimble - "When you do things right, people won't be sure you've done anything at all"
If I have the following ListView, how can I attach a SelectedIndexChanged event listener to the DropDownList so I can perform a command on the respective object? Imagine I have a list of new users and I want to add them to a usergroup by selecting the group from the DropDownList.
<asp:ListView ID="NewUsers" runat="server" DataSourceID="NewUsersSDS" DataKeyNames="ID">
<LayoutTemplate>
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I have a maximized form that has controls at the top of it and a large DataGridView that is docked below all the controls. Its kind of like the Ribbon in MS Office. The controls cover about 1/4 of the screen at the top. I would like a way for the user to click a button to hide all the controls then automatically expand into the place the controls were so the user can view more data in the DataGridView and visa versa. For example, in MS Office Excel you can hide the ribbon by clicking a tiny button that has "^" on it.
I'm not very familiar with all the controls in Visual Studio so I would like to hear some recommendations. Is this situation ideal for a SplitContainer or ToolStripContainer or am I way off base here?
I've been building controls for many years professionally and personally, but even back in VB6 days I just could not work this out. After all this time I remembered about it again.If I create a usercontrol/containercontrol and add one or more controls to the controls surface, I just cannot figure out how to access the controls at design time.
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