How To Detect If USB Cable Is Inserted / Detected And Ready

Apr 5, 2010

I would like to detect the insertion, and completion of installation of a USB cable in VB2008 as two separate events. The driver gets installed prior to insertion of the cable.


Detect When Drive Is Ready Or Not?

May 31, 2010

I'm trying to create a Windows Explorer like application, when a flash drive is connected/disconnected the application detects it and does some stuff. This is what I've accomplished so far:


Private Const WM_DEVICECHANGE As Integer = &H219
Private Const DBT_DEVICEARRIVAL As Integer = &H8000
Private Const DBT_DEVICEREMOVECOMPLETE As Integer = &H8004


One thing that this code does not do is detect when the driver changes from ready to not ready, e.g. if a CD is removed/ inserted into the optical drive or a memory card is removed/inserted into the card reader. How can I accomplish that?

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Detect Process And Not Running It When Detected?

Feb 9, 2012

trying to detect the process, if it is not running, then only run the process, but it still runs the process eventhough the process is still running :(

For Each Proc As Process In Process.GetProcesses()
Dim strProc As String = Proc.ProcessName & ".exe"
If Not strProc = "MemberSyncFBtoSQL.exe" Then


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Sql Server - How To Get Last Inserted Identity In Formview Inserted Event Using .net

Sep 21, 2009

I am using (FormView and ObjectDataSource) and Sql Server 2005.

I want to get last inserted @@identity in table on FormView1_ItemInserted

Protected Sub FormView1_ItemInserted(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.FormViewInsertedEventArgs) Handles FormView1.ItemInserted

End Sub My issue is that I want to redirect my FormView to readonly mode after FormView1_ItemInserted but for that I need to show the inserted record in readonly mode and that is only possible if I get my last inserted @@identity.

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Communication Via Serial To USB Cable

Jun 24, 2009

I have a device that communicates with the pc via a serial to usb cable. So I have made windows form with a serial communication to speak with it. The communication is every 125ms so every time it checks if the com port is open and sends the new message. The problem is that if the usb is not connected the program tries every 125 ms to connect to the serial port and the busy cursor appears always and the form is not responding to any action (for example enter into the menu or refresh a listbox). I have tried multiple times to connect and disconnect the usb while the program is running. That's mean that the serial connection stopped and started all over again several time. The problem is that occasionally it shows an error "unable to open com port".

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.Net 2008 Cable Direct Solution?

Nov 1, 2009

I am having trouble getting the total due for businesses to calculate correctly. Especially when I run the program and alter the amount of connections or the number of premium channels.


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Get Data From 2 Databases Namely Cable And History?

Apr 20, 2009

I need to get data from 2 databases namely cable and History. The results obtained from it will be display in a datagridview. MyCommand is a sql statement i wrote. However,i have errors in it. The codes are as followed.

Dim dbset As New DataSet
Dim data As New OleDbDataAdapter
data = New OleDbDataAdapter(MyCommand)


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Read File From Another Computer Through Ethernet Cable?

Oct 9, 2009

i would like to ask is there a method which i can read a specific file from another computer??i would like to use IP address to specify the address.

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VS 2010 Virtually Replug Ethernet Cable?

May 21, 2012

i want to make a little program that virtually REplugs my internet cable.

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Get Info From A Scale Using An RS232 Cable Into A VB2010 Program

Oct 28, 2010

So I am trying to get info from a scale using an RS232 cable into a VB2010 program. But before we even start talking about that, I don't know ANYTHING about serial ports. I need to learn how to get the data from the scale without programming first... I am using Win7. I do have a sample program (w/ source) I downloaded [URL]) It runs without any errors, then I have a big USER error, what do I push? How do I tinker to figure out the right settings on this interface? or any interface. These are the sittings for the scale: [URL] I am considering returning my scale and getting something with maybe USB on it, I need to be able to weight things up 100lbs, I am shipping car parts.

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Toggle USB Port Without An Inteligent Hardware On Other Side Of Cable?

Oct 8, 2010

Is it possible to toggle the D+/D- signals of the USB port to activate a relay

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Communications :: Serial Port Communication Via Null Modem Cable?

Sep 4, 2009

I have a app running on one computer, displaying text into 2 texboxes or labels.I need to see the two values in two sperate textboxes or labels from the two labels on another computer via a null modem serial adapter.

1st computer.



straight forward right?

2nd computer to read the data

Private Sub SerialPort1_DataReceived(ByVal sender As Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles SerialPort1.DataReceived
dim s as new string = serialport1.readline()
label1.text = s

This is what I was thinking;

serialport.writeline(label1.text & label2.text

This would send the two values over the serial port. How would I seperate the two values and display them in two different texboxes?cannot use them together)Am I on the right path at all? Or using the serialport.writeline method won't work at all....

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Send A Command To A Tenma DC Power Supply Over An RS232 Cable?

Jan 17, 2009

I am doing wrong? I am using VB2008/VB.NET to send a command (set to 4 volts) to a Tenma DC Power Supply over an RS232 cable. I don't have documentation from Tenma that lists the commands that the instrument understands, I got "VOLT040" from a program in an older version of VB that someone else wrote for this instrument. The code is below:


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Check When The Webbrowser Is Ready?

Apr 6, 2011

How do I check when the webbrowser is ready? The code below should work but continues to work before the website have loaded completely.

While (WebBrowser1.ReadyState <> 4)
End While

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Get WebBrowser Text When It Is Ready?

Jan 20, 2010

After lot of searching I found a working sample showing how to get a HTML page loaded. It works now if I wait until it is finished loading and then press a button to transfer HTML data into string. I tried to use webBrowser1.DocumentCompleted event but it does not fire.My question: How to get the data automatically when it is ready. Or what is wrong in my code.


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How To Make App Ready For Localization

Jul 1, 2009

I've been reading about i18n and how to make my app ready for localization. One thing recommended is to set the NeutralResourceLanguageAttribute in the AssemblyInfo.vb file like such: <Assembly: NeutralResourcesLanguageAttribute("en")>However, when I do that I get 'Type is not defined' Anybody have any clues?

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Make The Program Ready For A CD?

Oct 21, 2009

i'm making a program that will be used Only from a CD, not ever downloaded to a PC.I just would like to have the user insert the CD into a CD-Rom Drive, and the program will Auto Start with a Splash Screen, then start/load the first windows form. The form will have some buttons on it for the user to interact with the CD, by either going to other window forms or by downloading exe files or zip files to the user's computer.

Also the form has buttons on it for the user to click on to bring up a PDF to be viewed.I have tried to do the Publish and found that it created a in I think it wantes to install my program, and my program is not for installing. only viewing and interacting with and maybe downloading files from it, my CD program is never to be installed.I'm pretty sure I need to save or create my program as just an AutoRun, that starts when the CD is inserted and that is all I think needs to be how do I just create a AutoRun Only version of my program, not a setup.exe?I will have a ini file to reference the AutoRun file on the CD, no problem.

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VS 2008 How To Ready XML File

Apr 12, 2011

[code]I have this type of xml file how i can access this xml file into dataset and i want to print name into textbox1.text and class in textbox2.text and rollno into textbox3.text how to do that ???

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Make Network Drive Ready

Mar 8, 2010

i have a NAS drive that is mapped to my system..My application will copy files to the drive but the only problem is the drive has a sleep function on it therefore when i try to copy files to it and it is in sleep mode, it says the folder does not exist (drive still in my computer but just with a red X on it)is there a function to make ir ready ? the only other way to do it is to double click the drive icon in my computer then it wakes up... but id rather not do this as its a pain.

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Ready An Existing PDF Page Size (ex. 8.5 X 11 - 11 X 17)

Jan 6, 2011

Like the title says i'd like to read an existing pdf page size with VB.Net. I've been working with Itext.Sharp, and the Acrobat.dll.

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System.IO.IOException: The Device Is Not Ready?

Oct 12, 2011

I am developing an application that reads from a network shared folder on a separate Windows Server.  When the application attempts to read, I am receiving the error message "System.IO.IOException: The Device Is Not Ready".  I have tried running the application as an Administrator, however I still receive the same error.The files in question do not appear to be in use by any other application. 

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VS 02/03 - Drive Ready Or Not (Listing Out Content)

Feb 16, 2010

I am listing all drives with GetLogicalDrives()..
I am getting ( A:. C:, K: )

Now I want to know Each of Above Drive is ...
1) Ready or Not (To list out its content)
2) Type Of each drive...

Even if Floppy is not inserted in A: Code Should return 0
I am using GetFileCount() for A: and I am getting error..
Drive not Ready. I am using VS2003 VB.NET

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VS 2010 Get If File Is Ready To Be Written To?

Aug 3, 2011

How would one be able to determine if a file is closed and ready to be written to ?

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WebBrowser Control And Ready State

Sep 10, 2009

I am using a webbrowser control to login to a website.[code]On successful login I have to navigate to another page. This will happen only if the login is correct. The issue here is as son as the login page is loaded the readystate of webbrowser control becomes complete and even before the I login to website the next line of code gets executed and results in an error as I am not logged in.url...How can I make my application wait for the login to be complete and then execute the above line of code.

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Determine If Java Applet Is Ready To Take Input

Nov 10, 2009

I am trying to navigate the URL to an applet login interface. Is there a way to determine if the applet is ready to take input? You know when Java is loading. My timing is not right, and I want to be able to make it stable by determining when Java applet login object is in a ready state.

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Editing Dll File In A Ready Made Project?

May 3, 2012

I want to be able to use the core frotz library (dll) in a different project (no WPF front end).  The dll needs to accept an entire string command as the input, and produce the entire output as a string. Produce this dll and the source of the class showing me how you did it.

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VS 2008 Show The Letters That Have All Ready Been Entered?

Apr 25, 2009

I'm making a hangman game (yes everyones starting point) and got the basics running. I've added so extras to it, such as reading in random words from a text file, only allowing capitals to be entered, an option of guesses the phrase etc. All very simple but a nice way to learn.

Anyway, I want it to show the letters that have all ready been entered between each guess. I want to do this by using an array and making sure the same letter cannot be entered more than once into this array.

So far i have the following:

Sub Main()
Dim GuessLetter As Char
Dim LettersGuessedArray(26)


and i do not know why. I want it to output the letter entered from the array "LettersStoredArray".

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Report Ready To Print Document - Error When Records End Up

Jan 12, 2012

I have a report ready to print document, however you will make it stop reading when the records end up, give it displays this error:

Index was out of range. It should be non-negative and less than the size of the collection.Parameter name: index

I've tried an index = 0 to no avail, I think that has to do with the End print. Because I cannot make it stop reading after all the records appear on the leaves.

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Server : Msg 823, Level 24, State 2, Line 1 - Error 21(The Device Is Not Ready)?

Feb 3, 2012

Server: Msg 823, Level 24, State 2, Line 1

I/O error 21(The device is not ready.) detected during read at offset 0x0000000001c000 in file 'Y:MSSQLDATAGLC2005.mdf'.

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VS 02 / 03 Error 'Visual Studio Is Ready To Deploy XY' List Window

Apr 11, 2009

Is there an error list in vs 2003? I can't remeber if there was and can't find it in the options... The TaskList window shows the errors but also messages like 'Visual Studio is ready to deploy XY' and it is distracting.

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ContextSwitchDeadlock Was Detected?

May 18, 2011

I'm getting this message in my 2010 debugger suddenly for some reason:The CLR has been unable to transition from COM context 0x4c4b68 to COM context 0x4c4cd8 for 60 seconds. The thread that owns the destination context/apartment is most likely either doing a non pumping wait or processing a very long running operation without pumping Windows messages. This situation generally has a negative performance impact and may even lead to the application becoming non responsive or memory usage accumulating continually over time. To avoid this problem, all single threaded apartment (STA) threads should use pumping wait primitives (such as CoWaitForMultipleHandles) and routinely pump messages during long running operations.

It happens while I am looping through a datatable. In each iteration I do a SQL Select lookup and a a SQL Update if I don't find a matching record.

For Each drCurrentRow As DataRow In m_Dataset.Tables("Group").Rows
Dim boolFound As Boolean = False
CheckForRecordInTemp(boolFound, drCurrentRow.Item("ACTIVITY_GROUP"))


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PInvokeStackImbalance Was Detected?

Jul 7, 2011

Am getting this error when am running the code to open/close the CD try:"PInvokeStackImbalance was detected Message: A call to PInvoke function 'TabsTest!TabsTest.Form1::mciSendString' has unbalanced the stack. This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the target unmanaged signature"


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VB - Desktop Computer With Cable Connection On Back Allows To Watch TV On Computer Using Windows Media Center

Jun 12, 2010

I have a desktop computer with a cable connection on the back that allows me to watch TV on the computer using Windows Media Center. I had the idea of writing a program that would access this feed and send it to another computer (laptop) via my network. That way I would be able to watch TV from anywhere that my network spans. I have no idea if this is possible or how I would even do it,

So I have three questions.
1: Is it possible?
2: How would I go about access the feed?
3: How would I send it over the network?

My original thought was doing it in Flash, but I'm not very good at Flash so I wanted to do it in VB.Net.

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Can Shift+F3 Be Detected With E.keydown?

Feb 7, 2012

I am running out of function keys and it will be nice if I can double up on some of them with the Shift Alt or Ctrl keys.I am using

if e.keydown = keys.F3 then{it does what it is supposed to}end if I tried e.keydown = keys.F3 AND e.keydown = keys.Shift but it gets ignored. Am I seeking the impossible or am I just missing something?Can some one tell me what I am missing or point me to an example?

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CLR Detected An Invalid Program?

Dec 3, 2010

CLR detected an invalid program

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DisconnectedContext Was Detected When Using ManagementObjectSearcher

Apr 14, 2011

I am using the following function within a WndProc override:


Edit and Possible Solution: Based on the answer at DisconnectedContext MDA when calling WMI functions in single-threaded application I think the solution here is to call GetPortName() outside of WndProc. I will test this tonight and post my result.

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Error - InvalidApartmentStateChange Was Detected

May 5, 2010

This is the message that I'm getting out of a program I'm writing.

InvalidApartmentStateChange was detected

Message: The current thread used to have an apartment state of MTA, but the application has CoUnitialized this thread and it is now STA. This may cause calls on RuntimeCallableWrappers representing some COM components to fail and may also cause COM component that are not multi-threaded to be accessed from multiple threads at the same time which can cause corruption or data loss.The current program structure is UI buttons that activate a BackGroundWorker object to do the processing and display progress in a progressBar.The only thing I seem to have added (as in I disable the code and it works fine) is code to print two reports.To sum up, I'm in the backgroundWorker thread, and I kick off an event "PrinterDoc1.Print()" which I've handled (there doesn't seem to be much flexibility on using an event for that), then later on in the backgroundWorker thread this error shows up pointing to the invocation of a delegate which updates a label on my form.

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Loader Lock Was Detected?

Aug 27, 2010

I am getting this right after I bind grid. I called the db multiple times (no more than 5.) and I bound those result to a datatable and it then throws this error. I was not getting this error yesterday when i was running this program. And there doesnt seem to be anything I have not done before.

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LoaderLock Error Detected?

Apr 20, 2009

I'm using an AutoDesk Inventor View API (dont think it matters for this question) placed on my form. I can call files and have them open without issue, only when I open assemblies (drawing files) I get this error:

"LoaderLock was : Attempting managed execution inside OS Loader Lock. Do not attempt to run managed code inside a DllMain or image initialization function since doing so can cause the application to hang."

I dont expect anyone to know much about the API, however I assume this is a common error.

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Midi CallbackOnCollectedDelegate Detected?

Feb 23, 2012

Hi to all, i really need some help with a piece of code. Im developing an app, which receive midi TIMECODE (MTC) and shows it on a textbox. when i start the app, it runs ok, and shows the mtc on the textbox, but after a few seconds it crashes and shows an error:
"A callback was made on a garbage collected delegate of type 'MidiTesting!MidiTesting.MidiIn_Callback::Invoke'. This may cause application crashes, corruption and data loss. When passing delegates to unmanaged code, they must be kept alive by the managed application until it is guaranteed that they will never be called."


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