Visual Basic

17-Jan-13 16:06

Hi All,

I am attempting to retrieve USB Usage History using VB.NET. I am using VS 2012.

The following block of code lists this entry.

Dim RegKey As RegistryKey = Registry.LocalMachine.OpenSubKey("SYSTEM\CurrentControlSet\Enum\USBSTOR\", False)

Dim str1 As String
For Each subKeyName As String In RegKey.GetSubKeyNames()

    Dim tempKey As RegistryKey = RegKey.OpenSubKey(subKeyName)
    Debug.Print("USBSTORE KEY: " & subKeyName & RegKey.GetValue(subKeyName, "").ToString())
    Debug.Print(" -----------")

    For Each NxtSubKeyName As String In tempKey.GetSubKeyNames()
        Dim tempKey1 As RegistryKey = tempKey.OpenSubKey(NxtSubKeyName)
        Debug.Print("USBSTOR SUBKEY: " & NxtSubKeyName.ToString() & " Value Count: " & tempKey1.ValueCount.ToString())
        For Each valueName As String In tempKey1.GetValueNames()
            Debug.Print(valueName & ": " & tempKey1.GetValue(valueName).ToString())
        Next

    Next
Next

My code produces this output:

CSS

USBSTORE KEY: Disk&Ven_SanDisk&Prod_Cruzer&Rev_1100
 -----------
USBSTOR SUBKEY: SDXX1005181106121551&0 Value Count: 12
DeviceDesc: @disk.inf,%disk_devdesc%;Disk drive
Capabilities: 16
HardwareID: System.String[]
CompatibleIDs: System.String[]
ContainerID: {2471d8a3-e22c-5a5e-8b09-f0bb7616119d}
ConfigFlags: 0
ClassGUID: {4d36e967-e325-11ce-bfc1-08002be10318}
Driver: {4d36e967-e325-11ce-bfc1-08002be10318}\0010
Class: DiskDrive
Mfg: @disk.inf,%genmanufacturer%;(Standard disk drives)
Service: disk
FriendlyName: SanDisk Cruzer USB Device

But when I export this registry entry to a text file, I get the following results:

Obviously we see much more information in the exported data. Why is there so much more info here and how can I get my VB program to access this information?

I am trying to write some code to obtain USB Usage History.

Thanks for any help,

CSS

Key Name:          HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\USBSTOR\Disk&Ven_SanDisk&Prod_Cruzer&Rev_1100
Class Name:        <NO CLASS>
Last Write Time:   1/17/2013 - 2:51 PM

Key Name:          HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\USBSTOR\Disk&Ven_SanDisk&Prod_Cruzer&Rev_1100\SDXX1005181106121551&0
Class Name:        <NO CLASS>
Last Write Time:   1/17/2013 - 2:51 PM
Value 0
  Name:            DeviceDesc
  Type:            REG_SZ
  Data:            @disk.inf,%disk_devdesc%;Disk drive

Value 1
  Name:            Capabilities
  Type:            REG_DWORD
  Data:            0x10

Value 2
  Name:            HardwareID
  Type:            REG_MULTI_SZ
  Data:            USBSTOR\DiskSanDisk_Cruzer__________1100
                   USBSTOR\DiskSanDisk_Cruzer__________
                   USBSTOR\DiskSanDisk_
                   USBSTOR\SanDisk_Cruzer__________1
                   SanDisk_Cruzer__________1
                   USBSTOR\GenDisk
                   GenDisk

Value 3
  Name:            CompatibleIDs
  Type:            REG_MULTI_SZ
  Data:            USBSTOR\Disk
                   USBSTOR\RAW

Value 4
  Name:            ContainerID
  Type:            REG_SZ
  Data:            {2471d8a3-e22c-5a5e-8b09-f0bb7616119d}

Value 5
  Name:            ConfigFlags
  Type:            REG_DWORD
  Data:            0

Value 6
  Name:            ClassGUID
  Type:            REG_SZ
  Data:            {4d36e967-e325-11ce-bfc1-08002be10318}

Value 7
  Name:            Driver
  Type:            REG_SZ
  Data:            {4d36e967-e325-11ce-bfc1-08002be10318}\0010

Value 8
  Name:            Class
  Type:            REG_SZ
  Data:            DiskDrive

Value 9
  Name:            Mfg
  Type:            REG_SZ
  Data:            @disk.inf,%genmanufacturer%;(Standard disk drives)

Value 10
  Name:            Service
  Type:            REG_SZ
  Data:            disk

Value 11
  Name:            FriendlyName
  Type:            REG_SZ
  Data:            SanDisk Cruzer USB Device


Key Name:          HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\USBSTOR\Disk&Ven_SanDisk&Prod_Cruzer&Rev_1100\SDXX1005181106121551&0\Device Parameters
Class Name:        <NO CLASS>
Last Write Time:   1/17/2013 - 2:51 PM

Key Name:          HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\USBSTOR\Disk&Ven_SanDisk&Prod_Cruzer&Rev_1100\SDXX1005181106121551&0\Device Parameters\MediaChangeNotification
Class Name:        <NO CLASS>
Last Write Time:   9/5/2011 - 8:07 PM

Key Name:          HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\USBSTOR\Disk&Ven_SanDisk&Prod_Cruzer&Rev_1100\SDXX1005181106121551&0\Device Parameters\Partmgr
Class Name:        <NO CLASS>
Last Write Time:   9/5/2011 - 8:07 PM
Value 0
  Name:            Attributes
  Type:            REG_DWORD
  Data:            0

Value 1
  Name:            DiskId
  Type:            REG_SZ
  Data:            {00af4242-d76c-11e0-8169-0024e8e34876}


Key Name:          HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\USBSTOR\Disk&Ven_SanDisk&Prod_Cruzer&Rev_1100\SDXX1005181106121551&0\LogConf
Class Name:        <NO CLASS>
Last Write Time:   1/17/2013 - 2:51 PM

ChandraRam17-Jan-13 20:03

ChandraRam

17-Jan-13 20:03

Looks like you are only reading one level down - your sub-key has further sub-keys.

Suggestion - use recursion to get at all the info.

HTH

Happiness will never come to those who fail to appreciate what they already have. -Anon

Alan N18-Jan-13 1:21

Alan N

18-Jan-13 1:21

Your code is essentially correct but what you haven't done is to read the type of data stored in each name-value pair so that the correct cast can be applied.

The raw data obtained from GetValue(valueName) is typed as Object and the ToString() conversion gives a correct representation in most cases, the exceptions being when the actual type is an array (REG_BINARY, REG_MULTI_SZ)

The technique is read the type via GetValueKind(valueName) and then apply a cast to the Object returned from GetValue(valueName). The incomplete method below shows the basics and in your case formatting the values ready for display should be done in the gaps left as "do something appropriate".

Private Sub InterpretValue(rawValue as Object, interpretAsType as RegistryValueKind)
    Select Case interpretAsType
        Case RegistryValueKind.Binary
          ' REG_BINARY
            Dim byteArray As Byte() = DirectCast(rawValue, Byte())
            ' Do something appropriate
            Exit Select
        Case RegistryValueKind.DWord
          ' REG_DWORD
            Dim signedValue32 As Integer = DirectCast(rawValue, Integer)
            ' Do something appropriate
            Exit Select
        Case RegistryValueKind.QWord
          ' REG_QWORD
            Dim signedValue64 As Long = DirectCast(rawValue, Long)
            ' Do something appropriate
            Exit Select
        Case RegistryValueKind.Unknown, RegistryValueKind.String, RegistryValueKind.ExpandString
            Dim stringValue as String = rawValue.ToString()
            ' Do something appropriate
            Exit Select
        Case RegistryValueKind.MultiString
          ' REG_MULTI_SZ
            Dim stringArray As String() = TryCast(rawValue, String())
            ' Do something appropriate
            Exit Select
    End Select
End Sub

SantLou4018-Jan-13 1:47

18-Jan-13 1:47

Thanks for the explanations. I understand that I should be considering the data type. I can change my code accordingly. But what about the "Last Write Time" information that is displayed in the exported text data for these keys? How can I access that? My goal is to capture the History of each USB device that was used in the system, with dates and times. I'm assuming that the Last Write Time on the exported text will give me this information, but I don't see how my code, even with the data type considerations, will access that.

Thanks,

Alan N18-Jan-13 4:05

Alan N

18-Jan-13 4:05

The .NET RegistryKey exposes a small subset of the full Windows Registry API and to get the LastWriteTime requires the Windows RegQueryInfoKey function. Microsoft made this really difficult prior to .NET 4, as the RegistryKey class did not expose the operating system registry key handle.

With the restriction of .NET 4 it should be a simple matter of using P/Invoke to call RegQueryInfoKey with the twelve parameters set correctly! I haven't done this but most of them are optional, so can probably be set to null or IntPtr.Zero.

http://msdn.microsoft.com/en-us/library/windows/desktop/ms724902(v=vs.85).aspx[^]

Retrieving the LastWrite time from a Registry key[^]

http://www.pinvoke.net/default.aspx/advapi32/RegQueryInfoKey.html[^]

http://msdn.microsoft.com/en-us/library/microsoft.win32.registrykey.handle.aspx[^]

If you have to work on a lower (lesser?) version of .NET then I don't think this will be an easy task as there is no facility to exchange handles between the .NET RegistryKey class and the native Windows functions. I think the only option would be using RegOpenKeyEx to get the handle and then call RegQueryInfoKey.

VB.NET ReportViewer too many Page Breaks rendered

Jeffnogueira22-Jan-13 4:31

Jeffnogueira

22-Jan-13 4:31

SantLou4017-Jan-13 3:39

Re: VB.NET ReportViewer too many Page Breaks rendered

17-Jan-13 3:39

Hi All,

I developed my app using VS 2012.

I designed my report using the Report Viewer control. The data on my report is not tabular. It is a fixed-field form that spans several pages. I set the data source to a collection of an object that I developed and all the data for the report comes from my collection (which will always only have one item in it).

The report seems to be working fine, I setup a header and footer. When my code refreshes the report, my data is displayed nicely on the report as i designed it. However, when I convert to Print view, the report seems to be inserting page breaks while rendering. my nice little 4-page form becomes a 10 page report with page breaks occurring on every other page and some extra at the end.

What can I look at to determine why these extra page breaks occur in the rendering process? I thought it may be page layout related, so I changed the margins to all zeros and still see the additional page breaks.

Also, another thing I noticed is that when I added the footer, the footer height is about 2.5 inches and the designer will not allow me to change it.

Any help will be greatly appreciated.

Thanks,

ChandraRam17-Jan-13 20:04

ChandraRam

17-Jan-13 20:04

What are the printer parameters? The printer selected, page size and margins will determine how many pages are rendered...

HTH

Happiness will never come to those who fail to appreciate what they already have. -Anon

Re: VB.NET ReportViewer too many Page Breaks rendered

SantLou4018-Jan-13 1:39

control 5 appliances using pc's parallel port[vb.net 2010]

18-Jan-13 1:39

Hi ChandraRam,

Thanks for your quick reply. My page size is 8.5x11. Page Units = Inches. Orientation in Portrait. I originally had the margins set at .5 for all, but I also tried changing them all to 0 with no change in the resulting number of pages.

In designing my report I used the Report Ruler to ensure that my data is only setup between 1 inch on the left and 7inch on the right. I used a Rectangle control to contain the different sections of my form so I can insure that each rectangle is only 6 inches long, starting at 1 inch on the right and all my field data is contained within a rectangle control. I am currently not specifying page breaks in the properties of any of my rectangle controls, although I did try to add a page break property on some rectangles which did not affect the additional page breaks when printing.

So my issue now is how can I determine what is specifically causing a page break.

Lord Christian15-Jan-13 20:10

Re: control 5 appliances using pc's parallel port[vb.net 2010]

15-Jan-13 20:10

my pc's operating system
windows 7 ultimate 32 bit
-------------------------

i am working on a project that will control 5 devices through pc parallel port/printer port.
when i run the program it will first appear a loginform
then when i enter.
it always returns that the port doesnt exist.
even though i have the port it cant detect it.. i dont know what is wrong with my code.

--------------------------------------------------------
Dim FILE_NAME As String = "LPT1"

If System.IO.File.Exists(FILE_NAME) Then
Dim objWriter As New System.IO.StreamWriter(FILE_NAME)
objWriter.Write("hi")
objWriter.Close()
MsgBox("ok")
Else
MsgBox("port does not exist")
End If
------------------------------------------------------
then after the login the next form is homepage. there you'll see the switch buttons that will turn on and off a device. when i clicked any of this buttons an error will prompt. its say that object reference not set to an instance of an object

NullReferenceException was unhandled.

Private Sub btn_app1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_app1.Click
If btn_app1.Text = "ON" Then
btn_app1.Text = "OFF"
btn_app1.BackColor = Color.Red
io(0)
Else
btn_app1.Text = "ON"
btn_app1.BackColor = Color.Green
io(1)
End If
End Sub

Private Sub btn_app2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_app2.Click
If btn_app2.Text = "ON" Then
btn_app2.Text = "OFF"
btn_app2.BackColor = Color.Red
io(0)
Else
btn_app2.Text = "ON"
btn_app2.BackColor = Color.Green
io(2)
End If
End Sub

Private Sub btn_app3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_app3.Click
If btn_app3.Text = "ON" Then
btn_app3.Text = "OFF"
btn_app3.BackColor = Color.Red
io(0)
Else
btn_app3.Text = "ON"
btn_app3.BackColor = Color.Green
io(4)
End If
End Sub

Private Sub btn_app4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_app4.Click
If btn_app4.Text = "ON" Then
btn_app4.Text = "OFF"
btn_app4.BackColor = Color.Red
io(0)
Else
btn_app4.Text = "ON"
btn_app4.BackColor = Color.Green
io(8)
End If
End Sub

Private Sub btn_app5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_app5.Click
If btn_app5.Text = "ON" Then
btn_app5.Text = "OFF"
btn_app5.BackColor = Color.Red
io(0)
Else
btn_app5.Text = "ON"
btn_app5.BackColor = Color.Green
io(16)
End If
End Sub

Private Sub io(ByVal bit As Integer)
val = axHwinterface1.InPort(888)
axHwinterface1.OutPort(888, CShort(val Or bit))
End Sub

--------------------------------------------------------
please help me im new in this.. Cry | :((

i need your help guys.. thank you in advance..
every response is very much appreciated

if you want to see my whole project you can Download it here

http://www.mediafire.com/?1zvx1ty736r2nnb

Bernhard Hiller15-Jan-13 20:42

Bernhard Hiller

15-Jan-13 20:42

There is an important and great technology: it's called debugging.
Set a break point somewhere in your code, e.g at Private Sub btn_app1_Click(...) and then run the code step by step. Thus you will detect the line of code where the exception is thrown.
I guess it happens at Private Sub io(...). Either axHwinterface1 is Nothing, or InPort(888) returns Nothing, then the next line fails.
Debugging will tell you the exact reason.

Re: control 5 appliances using pc's parallel port[vb.net 2010]

Lord Christian17-Jan-13 7:15

Re: control 5 appliances using pc's parallel port[vb.net 2010]

17-Jan-13 7:15

thank you for the reply Mr. Bernhard.. im sorry but i don't know exactly how to debug it i need a lot of information to understand the errors. i know that i dont know a lot of things in VB but im willing to learn, im still a student.

thank very much you sir for the advice. i'll tell you i comes up with a solution.

Richard MacCutchan15-Jan-13 22:59

Richard MacCutchan

15-Jan-13 22:59

Take a look here[^].

One of these days I'm going to think of a really clever signature.

Re: control 5 appliances using pc's parallel port[vb.net 2010]

Lord Christian17-Jan-13 6:56

Re: control 5 appliances using pc's parallel port[vb.net 2010]

17-Jan-13 6:56

thank you for your reply Mr.Richard
in the link you gave me. do i need all that codes in my project? im sorry but some of its content is new to me.
hope you can help me what to add in my project.

i'll try test those code in the link if it will make my device work.

thank you again.. looking forward for you reply.

Richard MacCutchan17-Jan-13 7:10

Richard MacCutchan

17-Jan-13 7:10

Sorry I don't know. You need to read the article and the code and figure out how much of it you need in your project. It largely depends on which parts you are having difficulty with.

One of these days I'm going to think of a really clever signature.

Re: control 5 appliances using pc's parallel port[vb.net 2010]

Lord Christian17-Jan-13 7:33