VS 2008 Checking For Existence Of Registry Key?
Jan 6, 2010
I am trying to have my program check for the existence of a registry key so I do not get a null reference exception error. The key may or may not exist depending on the computer. How can I check to see if it exists and then change its value if it does exist or skip over it to the next one if it does not exist? (I already know how to change the value part of it) Im just not sure how to check for the existence of it for example would be trying to set the value of a key that does not exist called test below... this obviously would throw a null exception error so how do I check for the existence of the key before executing these instructions and then if it does not exist it skips this and keeps going to the next code ?
Dim testkey As RegistryKey = Registry.LocalMachine.OpenSubKey("SystemCurrentControlSetTEST", True)
Dim keyval As Int32
' Set to ON
keyval = 1
testkey.SetValue("ON", keyval)
I also check the status of the registry entry on form load
Dim Test As RegistryKey = Registry.LocalMachine.OpenSubKey("SystemCurrentControlSetMYTEST", False)
'Get the reg value.
Dim Testflag As Integer = CInt(Test.GetValue("ON"))
[code]....
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Mar 5, 2009
The application I'm writing requires the user to select a certain directory on their hard-drive (a game directory), which is saved to the Settings. If the directory is not selected, my application can't work. So, when the program starts for the first time, the directory setting will not be present, and I want my application to ask the user to select the correct directory before the application starts (the main form is shown). I used the following code in the Form_Load event of my main form:
vb.net
If My.Settings.WolfPath = String.Empty Then
MessageBox.Show("Please select your root 'Wolfenstein - Enemy Territoryetmain' mapping installation.", "Select W:ET Path", MessageBoxButtons.OK, MessageBoxIcon.Information)
[code]....
It looks pretty complicated (probably too complicated) but I wanted to make sure that the user cannot continue until a valid directory has been selected. So when the user cancels the folder selection, my application should end. If the user selects an invalid directory (it should end in "etmain") it should display a messagebox and show the folder browser dialog again. It should keep doing this until the correct path has been chosen.The problem occurs when an invalid directory is first chosen. The messagebox does show, but it shows behind all other applications! It took me a minute to figure that out, because I could not find my application anywhere, but Visual Studio still said it was running... After finally finding the messagebox behind everything else, it seems that now everything comes up behind everything else! When I click OK on the messagebox, the new folder browser dialog also shows up in the background, etc, etc. If I then choose a valid directory, the application loads the main form in the background...
I thought at first the problem would be the fact that I am running this code in the Form_Load event. A better place perhaps would be a Sub Main() from which the main form would be loaded explicitly (Application.Run(mainForm)). However, I can only select Forms as the Startup Form. If I disable the "Enable application framework" checkbox I can select the Sub Main() as Startup Object, but all the visual styles are lost...?
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Jun 2, 2010
is there is any direct method or function in array class that can check if any given byte array is a subarray of other array?or should i loop through the each byte of main array to see if smaller array exists in that or not?
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Jun 16, 2011
I am trying to check where an item in my array list exists in the database.The list would have already been created at an earlier stage.Now that some items may have been removed from the database, I wish to check the list against that database before removing the items, from the list, which are no longer in the database.The following code removes all items from the list rather than just each one which doesnt exist.[code]....
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Jun 15, 2010
I'm trying to determine the framework version that is installed via the registry. When poking around, I found this key: HKLMSOFTWAREMicrosoft.NETFrameworkPolicyv4.0 I've created the following function to determine if the key exists:
[Code]...
I've verified the key exists, but it keeps returning False.
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Jan 14, 2010
I have tried to solve this myself and I know I am probably doing something really silly here what I have is two different registry values that control what is displayed in the combobox on my form RegistryKey1 has the following values:0,1 or it does not existRegistryKey2 has the following values2,3, or 4 the combobox has the following values 0,1,2,3 However here is the problem if the RegistryKey2 is 2 then it further has to be checked if RegistryKey1 is either 0,1 or does not exist
if it is 1 then the selectedindex = 0
if it is 0 or does not exist then the selectedindex = 1
if RegistryKey2 is 3 then the selectedindex = 2
[code].....
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Mar 20, 2012
I have an installer for my application that makes changes to the registry for better application performance However, depending on the language of the operating system installed this input need changes For example (which is the case itself) Systems in Portuguese the entry is called (Padrao)Systems in English the entry is called (Default) I know I have I change the property "Condition" of the entry I created but I do not know what I have to write in this "Condition" I write within this property to validate that The system is in English or The system is in Portuguese I plan to put the project set two registry entries, one that will be done on systems with English language and other entry in systems with Portuguese language?
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Mar 23, 2010
how do i write to the windows registry and read from the registry?i'm using windows 7 - 64 bits, and visual studio 2008.
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Aug 3, 2009
I have the following code:
' The yearNode does not exist.
Dim yearNode = From y In App.Data.<year>
Where y.@id = xlParams.Year
[code].....
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Apr 2, 2009
I need to search a Byte array for the existence of another Byte array. The first array is large, about 30,000 bytes and the second varies but is usually between 300 and 500 bytes. I need to know the start position of the second array inside the first. For example if these were the arrays:
Code:
Array 1 Array 2
00
34
00
23 23
00 00
64 64
00 00
41 41
00
45
92
33
I would need to know the start position is 3.
Code:
For x = 0 To UBound(Array1)
If Array1(x) = Array2(0) And Array1(x + 1) = Array2(1) And Array1(x + 2) = Array2(2) Then
' Found it
End If
Next
And loop through finding it by brute force but array 2 will be a different size on each system so doing the above, although I could make it work, isn't practical. I could even do multiple if's like if I find the first byte then find the second, then find the third, and make it a little more bearable but still. Is there a simple way to find a array inside another array?
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Dec 16, 2010
Dim file As System.IO.FileStream Dim YesNo As Integer YesNo = MsgBox("_missions_recomp.gsc Already exists, do you want to overwrite?", vbYesNo, "Confirm Overwrite?")
[Code]...
Here's the scoop. This is a simple file check, where it will write a file so long as it does not exist,however, if the file already exists, I would like to give the user the option to overwrite the file, or not.
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Apr 29, 2011
WHY can I not check for the existence of a file in the c:windowssystem32 directory? The file IS there and this method still returns false.
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Mar 31, 2012
In TSQ IF MyVal IN (1, 2, 3, 4, 14) BEGIN ... END .Is there a way to do this in VB.NET? Is it possible to check for the existence of an integer in a set of integers inline? Such as: If MyVal in (1, 2, 3, 4, 14) Then ... End If
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May 31, 2012
I'm trying to verify if data exists in two different tables in a single transaction. The reason for the single transaction is the database gets hit about 1-3 million times a day so adding anymore than 1 extra transaction would increase that number up to 9 million, and my poor little server needs a break :)
So I need to check if an ID exists in table X and table Y and return the results to my VB.net script so I can handle the outcome Ideally something like this would work
if exists (select id from X where id = @id)
print 'True,' else print 'False,'
if exists (select id from Y where id = @id)
print 'True' else print 'False'
Which gives me "True, True" if exists in both or "True, False" etc etc... But that only displays in SQL print and not actually returning it as an object/string or array values that I can use.
I'm open to any sort of solution of this nature that can give me two results from a single transaction and how to handle that response in vb.
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Jun 7, 2012
I am using PostgreSQL database with VB.net through ODBC what goes OK. Sample code:
[Code]...
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Apr 2, 2010
I'd like to use the webrequest webresponse method to test for the existence of a file.If the first file is there, then I want to test for the existance of the same filename with -1.htm appended to it. If that filename exists, then test for filname-2.htm This continues until the filename being tested comes back 404 error. At which point, the program does NOT blow up, but the do until loop stops and the code continues. I have to search for a link on each one of the pages found once I have determined how many pages there are.How do I test for a file and not have it blow up? It has to loop and it goes through at least once. this is code I wrote. Right now the page just keeps going and going. IE's little logo on the page tab keep going around in a circle like it's in an endless loop.
Dim fr As System.Net.HttpWebRequest
Dim A As Integer = 1
Dim Count As Integer = 0
[code]....
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Aug 4, 2010
Is there any better performance by checking for a true value like this:
[CODE]..............
Than like this:
[CODE]..............
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Dec 21, 2011
i have a textbox in a calculator and i want an if function so that it checks that there cannot be 2 .'s in it:[code]
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Apr 25, 2009
i know My.Computer.Network.Ping but as alot of people know, it's glitchy and bugged.
I want something that checks to see if it can connect with something, as simple as it sounds.
I'm experimenting with sockets at the moment, but having trouble so i thought i would come and ask here
What i'm up to:
VB
IP = Net.IPAddress.Parse(getinfo("settings.inf", i & "IP"))
socket = New Net.Sockets.Socket(Net.Sockets.AddressFamily.InterNetwork, Net.Sockets.SocketType.Stream, Net.Sockets.ProtocolType.IP)
[Code].....
However the problem with this it that i pinged 1.1.1.1 and it still connects, ALSO i would like to be able to check a hostname not just an IP to make things more convenient, please help me to find a way to properly check a connection with IP or hostname.
Note: The getinfo function is defined by me
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Feb 28, 2010
In the following code, a Date variable is declared but not set to anything:
Dim myDate As Date
What's the proper method of checking if the Date variable is "new" and not set to anything?
For example, getting the lowest date value from an array of dates:
Dim dtMostRecent As Date
For i As Intger = 0 To myDateArray.Count - 1
If myDateArray(i) < dtMostRecent Then dtMostRecent = myDateArray(i)
Next
In the code above, I need a way to check first if dtMostRecent is unassigned, in which case just give it the first value, after which it can be compared with subsequent values. How to check if a Date variable is unassigned.
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Jul 19, 2010
I've created the following function and thrown it inside of a timer:
[code]...
It works, but it keeps trying to open media player for each process it looks like. I need to continuously run the function so that Media Player opens when it's closed.how to make sure it opens only once when the process doesn't exist?
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May 16, 2011
Can someone tell me why this code works exactley the opposite of the way I thought it should?
[code]...
I have a combobox (cbKeyWords). I want to make sure tbAddEdit.Text does not already exist before I save. To me I should be testing for a False result not True. But the above code, goes to the msgbox if findstringexact=false and saves the data if it's true.
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Jul 15, 2009
I was curious why this bit of code won�t detect that the ARGB value is Blue:
[Code]...
When I run the code it says that the color isn�t Blue.
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Apr 15, 2009
I have agroupbox control and on this groupbox control there is upto 10 checkboxes, if any of them are unchecked i was going to throw a warning "No checkboxes selected" i'm not sure how to go about it so far i have:
For Each ctrl As Control In GroupBox10.Controls
'Not sure what to do here...
Next
[code].....
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Sep 20, 2010
I have 22 text boxes that have to be checked to see if the value has changed. I am using the TextChanged Event handler to do this thus:
Private Sub TextStringChanged(ByVal sender As System.Object, ByVal e As System.EventArgs)
DataChanged = True
RemoveHandler ........
[code]....
The Handler would be added after the data had been loaded. The question is:Is there another way of checking for text changes without having to add and remove 22 handlers.
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Apr 3, 2011
I'm having trouble using the HasChanges method.I'm trying to get a message box to show if a user hits the edit button, makes a change, then hits the close button without hitting the save button first. From what I understand, the HasChanges(DataRowState.Modified) statement should work.In reality, when I hit the edit button, make a change to a field (zip for example), then hit the close, it just closes without showing the messagebox.Here's my code so far...
Private Sub CustomerForm_FormClosing(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) _
Handles Me.FormClosing
[code].....
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Jan 21, 2010
Suppose I have 5 Integers(A, B, C, D, and E) and 5 Textboxes. When the program run, the user is going to input 5 numbers to those 5 textboxes. When a button is pressed, a label will show up and write the textbox number with the biggest number.
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Aug 3, 2009
I'm very green with VB Express 2008 and am going through the tutorial. I'm skipping over a lot of the exercises as some of it is review for me - I've a fairly solid background in MS Access VBA and forms design there. But I have a simple question on VB Express forms design (I'm not worried about data handling or anything yet).How do I test a form? In my first form on my project, I just press F5 (Start debugging) and it opens just fine. However, I'm playing around with a second form in design mode and can't seem to get it to open to test some of the code (simple msgboxes associated with buttons).
In Access 2003 and earlier, there was a design mode and form view. The Access design mode was the equivalent of the design tab in the VB project, but I can't seem to find the equivalent of the Access form view in VB so that I can open that form. VB F5 only seems to open the first form.BTW, is VS 2008 the correct tag/prefix for this question on VB Express 2008? I see there's a separate tag list - is there an approved list of tags aside from the prefix before the title in the posting screen?
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Feb 9, 2011
I'm checking is a file exists as follows.
If txtGradeObs.Text = "" Or Dir(txtGradeObs.Text) = "" Then
MsgBox("Specify the Grade job of Obstructions", vbExclamation, MsgBoxTitle)
Exit Sub
End If
I get an error if the drive does not exist - i.e. G: rather than C:. It used to work in VB6. How can I get it to work.
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Aug 3, 2010
I want to make a program where I can chose a COM port (For example COM 1), then check if it's working. It would be really useful for me, seeing as I work a lot with broken COM cards.
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