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editing html string having text and several images using regex

I am new to this forum and hoping to get some help.
I have a an HTML string having text and several base64 images.
I need to loop through all image tags adding a slash / before
the closing tag > so that each image ends with /> and return
a new html string with the changes.
so each
<IMG src="data:image/png;base64,iVBORw0KG....">
should then be
<IMG src="data:image/png;base64,iVBORw0KG...."/>
I am not versed with html and I am wondering how to do it
(using regex?).
Here is some pseudo code:
Function GetSourceImges(Sourcehtml As String) As List(Of String)
Dim listOfImgs As New List(Of String)()
'use regex to find image tags
'Return list of base64 image tags
End Function
For each image in list
insert a slash appropriately
next
Reconstitute a new html string with edited images
Thanks

Map all "IMG" tags using LINQ and use their indexes as an anchor to fix the missing "/" characters. please see my comments inside the code.
Sub Main()
Dim htmlstring As String = "<IMG src=""data:image/png;base64,iVBORw0KG....""> " & vbCrLf _
& "<img src=""data:image/png;base64,iVBORw0KG...."">" & vbCrLf _
& "<p>blahblah</p>" & vbCrLf _
& "<IMG src=""data:image/png;base64,iVBORw0KG...."">" & vbCrLf _
& "<p>blahblah</p>"
' find all indxes of img using regex and lambda exprations '
Dim indexofIMG() As Integer = Regex.Matches(htmlstring, "IMG", RegexOptions.IgnoreCase) _
.Cast(Of Match)().Select(Function(x) x.Index).ToArray()
' check from each index of "IMG" if "/" is missing '
For Each itm As Integer In indexofIMG
Dim counter As Integer = itm
While counter < htmlstring.Length - 1
If htmlstring(counter) = ">" Then
If htmlstring(counter - 1) <> "/" Then
' fix the missing "/" using Insert() method '
htmlstring = htmlstring.Insert(counter, "/")
End If
Exit While
End If
counter += 1
End While
Next
Console.WriteLine(htmlstring)
Console.ReadLine()
End Sub

Surprisingly it works with the console app but doesn't when I view it on a richtextbox as in btnEditHTML method below. The generated pdf has only one red dot and not two.
Can't say why.
I must say you have been very helpfull.
'SetTable and customimagetagprocessor borrowed from [here] iTextsharp base64 embedded image in header not parsing/showing
Imports System.IO
Imports iTextSharp.text
Imports iTextSharp.tool.xml
Imports iTextSharp.text.pdf
Imports iTextSharp.tool.xml.parser
Imports iTextSharp.tool.xml.pipeline.css
Imports iTextSharp.tool.xml.pipeline.html
Imports iTextSharp.tool.xml.pipeline.end
Imports iTextSharp.tool.xml.html
Imports System.Text.RegularExpressions
Public Class Form1
Dim dsktop As String = My.Computer.FileSystem.SpecialDirectories.Desktop
Public Function GetFormattedHTML(str As String) As String
'format images by changing > to />
' find all indxes of img using regex and lambda exprations '
Dim indexofIMG() As Integer = Regex.Matches(str.ToString, "IMG", RegexOptions.IgnoreCase) _
.Cast(Of Match)().Select(Function(x) x.Index).ToArray()
' check from each index of "IMG" if "/" is missing '
For Each itm As Integer In indexofIMG
Dim counter As Integer = itm
While counter < str.ToString.Length - 1
If str(counter) = ">" Then
If str(counter - 1) <> "/" Then
' fix the missing "/" using Insert() method '
str = str.ToString.Insert(counter, " /")
End If
Exit While
End If
counter += 1
End While
Next
Return str.ToString
End Function
Private Sub btnEditHTML_Click(sender As Object, e As EventArgs) Handles btnEditHTML.Click
Rtb.Text = String.Empty
'the 2 base64 images in the html below are actually just small red dots
Dim RawHTML As String = "<P>John Doe</P><IMG " &
"src=""data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mP8z8BQDwAEhQGAhKmMIQAAAABJRU5ErkJggg==""> Jackson5<IMG " &
"src=""data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mP8z8BQDwAEhQGAhKmMIQAAAABJRU5ErkJggg=="">"
Rtb.Text = GetFormattedHTML(RawHTML)
'notice that the 2nd base64 string is not edited as required.
End Sub
Private Sub btnGenerate_Click(sender As Object, e As EventArgs) Handles btnGenerate.Click
'here I create a 2 column itextsharp table to parse my html into the cells
Dim doc As New iTextSharp.text.Document(iTextSharp.text.PageSize.A4, 25, 25, 25, 30)
Dim wri As PdfWriter = PdfWriter.GetInstance(doc, New System.IO.FileStream(dsktop & "\testtable.pdf", System.IO.FileMode.Create))
doc.Open()
'set table columnwidths -------------------------------------------------------------
Dim MainTable As New PdfPTable(2) '2 column table
MainTable.WidthPercentage = 100
Dim Wth(1) As Single
Dim u As Integer = 2
For i As Integer = 0 To 1
Wth(i) = CInt(Math.Floor(2 * 500 / u))
Next
MainTable.SetWidths(Wth)
Dim htmlstr As String = GetFormattedHTML("<P>John Doe</P><IMG " &
"src=""data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mP8z8BQDwAEhQGAhKmMIQAAAABJRU5ErkJggg==""> Jackson5<IMG " &
"src=""data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mP8z8BQDwAEhQGAhKmMIQAAAABJRU5ErkJggg=="">")
Dim Elmts = New ElementList()
Elmts = XMLWorkerHelper.ParseToElementList(htmlstr, Nothing)
Dim MinorTable As New PdfPTable(1)
MinorTable = SetTable(Elmts, htmlstr)
For i = 1 To 2
Dim Cell As New PdfPCell
Cell.AddElement(MinorTable)
MainTable.AddCell(Cell)
Next
doc.Add(MainTable)
doc.Close()
Process.Start(dsktop & "\testtable.pdf")
End Sub
Public Function SetTable(ByVal elements As ElementList, ByVal htmlcode As String) As PdfPTable
Dim tagProcessors As DefaultTagProcessorFactory = CType(Tags.GetHtmlTagProcessorFactory(), DefaultTagProcessorFactory)
tagProcessors.RemoveProcessor(HTML.Tag.IMG) ' remove the default processor
tagProcessors.AddProcessor(HTML.Tag.IMG, New CustomImageTagProcessor()) ' use our new processor
Dim cssResolver As ICSSResolver = XMLWorkerHelper.GetInstance().GetDefaultCssResolver(True)
cssResolver.AddCssFile(Application.StartupPath & "\pdf.css", True)
'see sample css file at https://learnwebcode.com/how-to-create-your-first-css-file/
'Setup Fonts
Dim xmlFontProvider As XMLWorkerFontProvider = New XMLWorkerFontProvider(XMLWorkerFontProvider.DONTLOOKFORFONTS)
xmlFontProvider.RegisterDirectory(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "assets/fonts/"))
Dim cssAppliers As CssAppliers = New CssAppliersImpl(xmlFontProvider)
Dim htmlContext As HtmlPipelineContext = New HtmlPipelineContext(cssAppliers)
htmlContext.SetAcceptUnknown(True)
htmlContext.SetTagFactory(tagProcessors)
Dim pdf As ElementHandlerPipeline = New ElementHandlerPipeline(elements, Nothing)
Dim htmlp As HtmlPipeline = New HtmlPipeline(htmlContext, pdf)
Dim css As CssResolverPipeline = New CssResolverPipeline(cssResolver, htmlp)
Dim worker As XMLWorker = New XMLWorker(css, True)
Dim p As XMLParser = New XMLParser(worker)
'Dim holderTable As New PdfPTable({1})
Dim holderTable As PdfPTable = New PdfPTable({1})
holderTable.WidthPercentage = 100
holderTable.HorizontalAlignment = Element.ALIGN_LEFT
Dim holderCell As New PdfPCell()
holderCell.Padding = 0
holderCell.UseBorderPadding = False
holderCell.Border = 0
p.Parse(New MemoryStream(System.Text.Encoding.ASCII.GetBytes(htmlcode)))
For Each el As IElement In elements
holderCell.AddElement(el)
Next
holderTable.AddCell(holderCell)
'Dim holderRow As New PdfPRow({holderCell})
'holderTable.Rows.Add(holderRow)
Return holderTable
End Function
End Class
Public Class CustomImageTagProcessor
Inherits iTextSharp.tool.xml.html.Image
Public Overrides Function [End](ctx As IWorkerContext, tag As Tag, currentContent As IList(Of IElement)) As IList(Of IElement)
Dim attributes As IDictionary(Of String, String) = tag.Attributes
Dim src As String = String.Empty
If Not attributes.TryGetValue(iTextSharp.tool.xml.html.HTML.Attribute.SRC, src) Then
Return New List(Of IElement)(1)
End If
If String.IsNullOrEmpty(src) Then
Return New List(Of IElement)(1)
End If
If src.StartsWith("data:image/", StringComparison.InvariantCultureIgnoreCase) Then
' data:[<MIME-type>][;charset=<encoding>][;base64],<data>
Dim base64Data As String = src.Substring(src.IndexOf(",") + 1)
Dim imagedata As Byte() = Convert.FromBase64String(base64Data)
Dim image As iTextSharp.text.Image = iTextSharp.text.Image.GetInstance(imagedata)
Dim list As List(Of IElement) = New List(Of IElement)()
Dim htmlPipelineContext As pipeline.html.HtmlPipelineContext = GetHtmlPipelineContext(ctx)
list.Add(GetCssAppliers().Apply(New Chunk(DirectCast(GetCssAppliers().Apply(image, tag, htmlPipelineContext), iTextSharp.text.Image), 0, 0, True), tag, htmlPipelineContext))
Return list
Else
If File.Exists(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, src)) Then
Dim imagedata As Byte() = File.ReadAllBytes(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, src))
Dim image As iTextSharp.text.Image = iTextSharp.text.Image.GetInstance(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, src))
Dim list As List(Of IElement) = New List(Of IElement)()
Dim htmlPipelineContext As pipeline.html.HtmlPipelineContext = GetHtmlPipelineContext(ctx)
list.Add(GetCssAppliers().Apply(New Chunk(DirectCast(GetCssAppliers().Apply(image, tag, htmlPipelineContext), iTextSharp.text.Image), 0, 0, True), tag, htmlPipelineContext))
Return list
End If
Return MyBase.[End](ctx, tag, currentContent)
End If
End Function
End Class

I highly recommend just using AngleSharp to parse the HTML, edit the document if required, and save it again.
There are many posts on here about why trying to parse HTML with regular expressions is a bad idea.
var doc = new HtmlParser().Parse(html);
As you aren't actually changing the HTML content, just fixing up the tags, your should be able to just parse it and save it with no changes to fix the tags.

How to use StrDup in C# [duplicate]

This question already has answers here:
Vb.Net convert StrDup to C#.net
(3 answers)
Closed 7 years ago.
Hello I have a code that use with VB.net:
Public Shared Function GetNextID(ByVal Prefix As String) As String
Dim dt As DataTable = Database.GetDataTable("select * from _NumberGeneration Where Entity = '" & Prefix & "'")
If dt Is Nothing OrElse dt.Rows.Count = 0 Then Return ""
Dim format As String = dt.Rows(0)("Format") & ""
Dim sqlCnt As String = dt.Rows(0)("SQL") & ""
Dim cnt As Int32 = Val(Database.ExecuteScalar(sqlCnt)) + 1 ' 11
Dim RN As String = format.Substring(format.IndexOf("["c), 4) ' [R5]
Dim newRN As String = StrDup(CInt(RN.Substring(2,1), "0"c) ' 00000
newRN = cnt.ToString(newRN) ' String.Format(newRN, cnt) ' 00011
Dim newformat As String = format.Replace(RN, newRN) '"PR"yyMM00011
Return Today.ToString(newformat) ' String.Format(newformat, cnt)
End Function
For the StrDup When I write the code with C# same as code below:
string newRN = new string (int.Parse(RN.Substring(2, 1)),'0');
It show the error.

Use the string constructor with character and count parameters:
string newRN = new string('0', 4);
You could also reference the Microsoft.VisualBasic assembly and call the method via the Strings module, but the alternative above is pretty simple.

how can I give the data source for OLEDB during the run time

I have an excel template file saved in web server folder.
During the run time I am giving the data source using the variable(dunsno) and date
but it throws an error:
Format of the initialization string does not conform to specification starting at index 3.
I just want to know how to write the connection string in the server side
I have done this:
protected void Button1_Click(object sender, EventArgs e)
{
string connStr = "provider=Microsoft.Jet.OLEDB.4.0;Data Source='Server.MapPath(~/Profile/ + "Tempfile" + dunsno + DateTime.Today.ToString("dd.MM.yyyy") + ".xls");Extended Properties=Excel 8.0;";
DirectoryInfo directoryInfo = new DirectoryInfo(Server.MapPath("~/temp/"));
var fileList = directoryInfo.GetFiles();
string newFileName = Server.MapPath("~/Profile/" + "Tempfile" + dunsno + DateTime.Today.ToString("dd.MM.yyyy") + ".xls");
foreach (FileInfo fleInfo in fileList)
{
fleInfo.CopyTo(newFileName, true);
}
OleDbConnection MyConnection;
OleDbCommand MyCommand = new OleDbCommand();
MyConnection = new OleDbConnection(connStr);
MyConnection.Open();
MyCommand.Connection = MyConnection;
string sql = "Insert into [Sheet1$] (id,name) values('3','c')";
MyCommand.CommandText = sql;
MyCommand.ExecuteNonQuery();
MyConnection.Close();
}
Some more VBA point to have this clarity :
Sub GrabLastNames()
'dimension (set aside memory for) our variables
Dim objIE As InternetExplorer
Dim ele As HTMLLinkElement
Dim e As HTMLLinkElement
Dim h As HTMLLinkElement
Dim t As HTMLTable
Dim s As String
Dim x, y, z
Dim c As Integer
Dim post As Object, Elem As Object
Set objIE = New InternetExplorer
objIE.Visible = True
i = 0
objIE.Navigate "http://apps.who.int/immunization_monitoring/globalsummary/countries?countrycriteria%5Bcountry%5D%5B%5D=ALB&commit=OK"
Do While objIE.Busy = True Or objIE.ReadyState <> 4: DoEvents: Loop
Set post = objIE.Document.getElementById("countrycriteria_country")
For Each Elem In post.getElementsByTagName("option")
c = c + 1
If c = 6 Then Exit For
Elem.Selected = True
objIE.Document.getElementById("countrycriteria_country").Focus
objIE.Document.getElementById("countrycriteria_country").FireEvent ("onchange")
Do While objIE.Busy = True Or objIE.ReadyState <> 4: DoEvents: Loop
For Each ele In objIE.Document.getElementsByTagName("table") '.getElementById("myTable").getElementsByTagName("tr")
s = LCase(Trim(ele.innerText))
If InStr(s, "immunization schedule") Or InStr(s, "percentage target population vaccinated by antigen") Then
For Each e In ele.Rows
i = i + 1
j = 3
' Sheet1.Cells(i, 1).Value = Elem.Value
For Each h In e.Cells
j = j + 1
Sheet1.Cells(i, j).Value = h.innerText
Next h
Next e
End If
Next ele
Next Elem
ActiveWorkbook.Save
End Sub
Sub Select_Item()
Dim post As Object, Elem As Object
With CreateObject("InternetExplorer.Application")
.Visible = True
.Navigate "http://apps.who.int/immunization_monitoring/globalsummary/countries?countrycriteria%5Bcountry%5D%5B%5D=ALB&commit=OK" ''stored the html elements within "element.html" file to test it locally
While .Busy = True Or .ReadyState < 4: DoEvents: Wend
Set post = .Document.getElementById("countrycriteria_country")
For Each Elem In post.getElementsByTagName("option")
If Elem.Value = "BHS" Then Elem.Selected = True: Exit For
' i = i + 1
' If i = 4 Then Exit For
Next Elem
Application.Wait (Now + TimeValue("0:00:02"))
.Document.getElementById("countrycriteria_country").Focus
Application.Wait (Now + TimeValue("0:00:02"))
'.Document.getElementById("countrycriteria_country").Change
.Document.getElementById("countrycriteria_country").FireEvent ("onchange")
End With
End Sub
' Loop vba========
' Elem.Selected = True
' objIE.Document.getElementById("countrycriteria_country").Focus
' objIE.Document.getElementById("countrycriteria_country").FireEvent ("onchange")
' Do While objIE.Busy = True Or objIE.ReadyState <> 4: DoEvents: Loop
Sub getCoverage()
Application.ScreenUpdating = False
Sheet1.Cells.Clear
'dimension (set aside memory for) our variables
Dim objIE As InternetExplorer
Dim ele As HTMLLinkElement
Dim e As HTMLLinkElement
Dim h As HTMLLinkElement
Dim t As HTMLTable
Dim s As String
Dim x, y, z
Dim con(1000)
Dim c As Integer
Dim post As Object, Elem As Object
Dim s1 As String, s2 As String, s3 As String, s4 As String
Set objIE = New InternetExplorer
objIE.Visible = True
' Do While objIE.Busy = True Or objIE.ReadyState <> 4: DoEvents: Loop
s1 = LCase(shtweb.Range("d5").Value)
s2 = LCase(shtweb.Range("e5").Value)
s3 = LCase(shtweb.Range("f5").Value)
s4 = LCase(shtweb.Range("g5").Value)
s2 = IIf(s2 = "", "fsdfswew", s2)
s3 = IIf(s3 = "", "fsdfswew", s3)
s4 = IIf(s4 = "", "fsdfswew", s4)
i = 0
objIE.Navigate "http://apps.who.int/immunization_monitoring/globalsummary/countries?countrycriteria%5Bcountry%5D%5B%5D=ALB&commit=OK"
Do While objIE.Busy = True Or objIE.ReadyState <> 4: DoEvents: Loop
Set post = objIE.Document.getElementById("countrycriteria_country")
For Each Elem In post.getElementsByTagName("option")
con(c) = Elem.Value
c = c + 1
Next Elem
'objIE.
For k = 0 To c
If con(k) = "" Then Exit For
objIE.Navigate "http://apps.who.int/immunization_monitoring/globalsummary/countries?countrycriteria%5Bcountry%5D%5B%5D=" & con(k) & "&commit=OK"
Do While objIE.Busy = True Or objIE.ReadyState <> 4: DoEvents: Loop
For Each ele In objIE.Document.getElementsByTagName("table") '.getElementById("myTable").getElementsByTagName("tr")
s = LCase(Trim(ele.innerText))
If InStr(s, s1) Or InStr(s, s2) Or InStr(s, s3) Or InStr(s, s4) Then
For Each e In ele.Rows
i = i + 1
j = 3
Sheet1.Cells(i, 1).Value = con(k)
For Each h In e.Cells
j = j + 1
If Left(h.innerText, 1) = "=" Then
Sheet1.Cells(i, j).Value = "'" & h.innerText
Else
Sheet1.Cells(i, j).Value = h.innerText
End If
Next h
Next e
End If
Next ele
Next k
ActiveWorkbook.Save
Application.ScreenUpdating = True
End Sub

use Path.Combine and a OleDbConnectionStringBuilder to create a valid connection-string:
var conString = string.Format("Provider=Microsoft.Jet.OLEDB.4.0; Data Source={0}"
, Path.Combine(dir, "nik.mdb"));
var conBuilder = new OleDbConnectionStringBuilder(conString);
using (var con = new OleDbConnection(conBuilder.ConnectionString))
{
// ...
}
Maybe you have white-spaces in the connection string.

Mute Vb/c++/C# application

I need to mute my application because it's using 5 webbrowsers and navigates to sites with flash, this can cause a lot of annoying sound , so I searched everywhere but no luck
I want to know if there is a way to mute either my application or my webbrowsers either through vb code or whatever other language (I will make a plug-in).
Thanks in advance for your help.

On Windows Vista and later, you can set an individual application's sound volume by calling a function inside winmm.dll
[DllImport("winmm.dll")]
private static extern int waveOutSetVolume(IntPtr hwo, uint dwVolume);
And call following static method:
public static void MuteApplication()
{
int NewVolume = 0;
uint NewVolumeAllChannels = (((uint)NewVolume & 0x0000ffff) | ((uint)NewVolume << 16));
waveOutSetVolume(IntPtr.Zero, NewVolumeAllChannels);
}

I think that you will need to set the configuration of IExplorer which is the process who plays that sounds.
You could set a flag to don't play sound using registry:
At this key:
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
Value name:
Play_Background_Sounds
Data:
no
Time ago I did a class to manage Regedit operations, you can use it like this:
RegEdit.Set_Value("HKCU\Software\Microsoft\Internet Explorer\Main", _
"Play_Background_Sounds", _
"no", _
Microsoft.Win32.RegistryValueKind.String)
RegEdit.Set_Value("HKCU\Software\Microsoft\Internet Explorer\Main", _
"Play_Background_Sounds", _
"yes", _
Microsoft.Win32.RegistryValueKind.String)
Here is the Class:
#Region " RegEdit "
' [ RegEdit Functions ]
'
' // By Elektro H#cker
'
' Examples :
'
' -----------
' Create Key:
' -----------
' RegEdit.Create_Key("HKCU\Software\MyProgram") ' Creates "HKCU\Software\MyProgram"
' RegEdit.Create_Key("HKEY_CURRENT_USER\Software\MyProgram\Settings\") ' Creates "HKCU\Software\MyProgram\Settings"
'
' -----------
' Delete Key:
' -----------
' RegEdit.Delete_Key("HKLM\Software\7-zip") ' Deletes the "7-zip" tree including subkeys
' RegEdit.Delete_Key("HKEY_LOCAL_MACHINE\Software\7-zip\") ' Deletes the "7-zip" tree including subkeys
'
' -------------
' Delete Value:
' -------------
' RegEdit.Delete_Value("HKCU\Software\7-Zip", "Lang") ' Deletes "Lang" Value
' RegEdit.Delete_Value("HKEY_CURRENT_USER\Software\7-Zip\", "Lang") ' Deletes "Lang" Value
'
' ----------
' Get Value:
' ----------
' Dim Data As String = RegEdit.Get_Value("HKCU\Software\MyProgram", "Value name"))
' Dim Data As String = RegEdit.Get_Value("HKEY_CURRENT_USER\Software\MyProgram", "Value name"))
'
' ----------
' Set Value:
' ----------
' RegEdit.Set_Value("HKCU\Software\MyProgram", "Value name", "Data", Microsoft.Win32.RegistryValueKind.String) ' Create/Replace "Value Name" with "Data" as string data
' RegEdit.Set_Value("HKEY_CURRENT_USER\Software\MyProgram\", "Value name", "Data", Microsoft.Win32.RegistryValueKind.String) ' Create/Replace "Value Name" with "Data" as string data
'
' -----------
' Export Key:
' -----------
' RegEdit.Export_Key("HKLM", "C:\HKLM.reg") ' Export entire "HKEY_LOCAL_MACHINE" Tree to "C:\HKLM.reg" file.
' RegEdit.Export_Key("HKLM\Software\7-zip\", "C:\7-zip.reg") ' Export entire "7-zip" Tree to "C:\7-zip.reg" file.
'
' ------------
' Import File:
' ------------
' RegEdit.Import_RegFile("C:\Registry_File.reg") ' Install a registry file.
'
' ------------
' Jump To Key:
' ------------
' RegEdit.Jump_To_Key("HKLM") ' Opens Regedit at "HKEY_LOCAL_MACHINE" Root.
' RegEdit.Jump_To_Key("HKEY_LOCAL_MACHINE\Software\7-zip\") ' Opens Regedit at "HKEY_LOCAL_MACHINE\Software\7-zip" tree.
'
' -----------
' Exist Key?:
' -----------
' MsgBox(RegEdit.Exist_Key("HKCU\software") ' Checks if "Software" Key exist.
' -------------
' Exist Value?:
' -------------
' MsgBox(RegEdit.Exist_Value("HKLM\software\7-zip", "Path") ' Checks if "Path" value exist.
'
' ------------
' Exist Data?:
' ------------
' MsgBox(RegEdit.Exist_Data("HKLM\software\7-zip", "Path") ' Checks if "Path" value have empty data.
'
' ---------
' Copy Key:
' ---------
' RegEdit.Copy_Key("HKCU", "Software", "7-Zip", "HKLM", "Software", "7-zip") ' Copies "HKCU\Software\7-Zip" to "HKLM\Software\7-Zip"
' RegEdit.Copy_Key("HKCU", "Software", "7-Zip", Nothing, "Software", "7-zip") ' Copies "HKCU\Software\7-Zip" to "HKCU\Software\7-Zip"
' RegEdit.Copy_Key("HKCU", "Software", "7-Zip", "HKLM", "Software", Nothing) ' Copies "HKCU\Software\7-Zip" to "HKLM\Software\"
' RegEdit.Copy_Key("HKCU", "Software", "7-Zip", "HKLM", Nothing, Nothing) ' Copies "HKCU\Software\7-Zip" to "HKLM\"
' RegEdit.Copy_Key("HKCU", "\Software\", "\7-Zip\", "HKLM", "\Software\", "\7-zip\") ' Copies "HKCU\Software\7-Zip" to "HKLM\Software\7-Zip"
'
' -----------
' Copy Value:
' -----------
' RegEdit.Copy_Value("HKLM\software\7-zip", "path", "HKLM\software\7-zip", "path_backup") ' Copies "Path" value with their data to "HKLM\software\7-zip" "path_backup".
'
' -------------------
' Set_UserAccess_Key:
' -------------------
' RegEdit.Set_UserAccess_Key("HKCU\Software\7-Zip", {RegEdit.RegUserAccess.Administrators_Full_Access})
' RegEdit.Set_UserAccess_Key("HKEY_CURRENT_USER\Software\7-Zip", {RegEdit.RegUserAccess.Administrators_Full_Access, RegEdit.RegUserAccess.Creator_Full_Access, RegEdit.RegUserAccess.System_Full_Access})
#Region " RegEdit Class "
Public Class RegEdit
Private Shared RootKey As Microsoft.Win32.RegistryKey = Nothing
Private Shared KeyPath As String = String.Empty
''' <summary>
''' Create a new registry key.
''' </summary>
Public Shared Function Create_Key(ByVal RegKey As String) As Boolean
RootKey = Get_Root_Key(RegKey)
KeyPath = Get_Key_Path(RegKey)
Try
RootKey.CreateSubKey(KeyPath)
RootKey.Dispose()
Return True
Catch ex As Exception
' MsgBox(ex.Message)
' Throw New Exception(ex.Message)
Return False
End Try
End Function
''' <summary>
''' Delete a registry key.
''' </summary>
Public Shared Function Delete_Key(ByVal RegKey As String) As Boolean
RootKey = Get_Root_Key(RegKey)
KeyPath = Get_Key_Path(RegKey)
Try
RootKey.DeleteSubKeyTree(KeyPath)
RootKey.Dispose()
Return True
Catch ex As Exception
' MsgBox(ex.Message)
' Throw New Exception(ex.Message)
Return False
End Try
End Function
''' <summary>
''' Delete a registry key.
''' </summary>
Public Shared Function Delete_Value(ByVal RegKey As String, ByVal RegValue As String) As Boolean
RootKey = Get_Root_Key(RegKey)
KeyPath = Get_Key_Path(RegKey)
Try
RootKey.OpenSubKey(KeyPath, True).DeleteValue(RegValue)
RootKey.Dispose()
Return True
Catch ex As Exception
' MsgBox(ex.Message)
' Throw New Exception(ex.Message)
Return False
End Try
End Function
''' <summary>
''' Get the data of a registry value.
''' </summary>
Public Shared Function Get_Value(ByVal RegKey As String, ByVal RegValue As String) As String
RootKey = Get_Root_Key(RegKey)
KeyPath = RootKey.ToString & "\" & Get_Key_Path(RegKey)
RootKey.Dispose()
Try
Return My.Computer.Registry.GetValue(KeyPath, RegValue, Nothing)
Catch ex As Exception
' MsgBox(ex.Message)
' Throw New Exception(ex.Message)
Return False
End Try
End Function
''' <summary>
''' Set the data of a registry value.
''' If the Key or value don't exist it will be created automatically.
''' </summary>
Public Shared Function Set_Value(ByVal RegKey As String, _
ByVal RegValue As String, _
ByVal RegData As String, _
ByVal RegDataType As Microsoft.Win32.RegistryValueKind) As Boolean
RootKey = Get_Root_Key(RegKey)
KeyPath = RootKey.ToString & "\" & Get_Key_Path(RegKey)
Try
If RegDataType = Microsoft.Win32.RegistryValueKind.Binary Then
My.Computer.Registry.SetValue(KeyPath, RegValue, System.Text.Encoding.ASCII.GetBytes(RegData), Microsoft.Win32.RegistryValueKind.Binary)
RootKey.Dispose()
Else
My.Computer.Registry.SetValue(KeyPath, RegValue, RegData, RegDataType)
RootKey.Dispose()
End If
Return True
Catch ex As Exception
' MsgBox(ex.Message)
' Throw New Exception(ex.Message)
Return False
End Try
End Function
''' <summary>
''' Export a registry key (including sub-keys) to a file.
''' </summary>
Public Shared Function Export_Key(ByVal RegKey As String, ByVal OutputFile As String) As Boolean
Dim RootKey As String = Get_Root_Key(RegKey).ToString
Dim KeyPath As String = RootKey & "\" & Get_Key_Path(RegKey)
If KeyPath.EndsWith("\") Then KeyPath = KeyPath.Substring(0, KeyPath.Length - 1)
Try
Dim Regedit As New Process()
Dim Regedit_Info As New ProcessStartInfo()
Regedit_Info.FileName = "Reg.exe"
Regedit_Info.Arguments = "Export " & """" & KeyPath & """" & " " & """" & OutputFile & """" & " /y"
Regedit_Info.CreateNoWindow = True
Regedit_Info.WindowStyle = ProcessWindowStyle.Hidden
Regedit_Info.UseShellExecute = False
Regedit.StartInfo = Regedit_Info
Regedit.Start()
Regedit.WaitForExit()
If Regedit.ExitCode <> 0 Then
Regedit.Dispose()
Return False
Else
Regedit.Dispose()
Return True
End If
Catch ex As Exception
' MsgBox(ex.Message)
' Throw New Exception(ex.Message)
Return False
End Try
End Function
''' <summary>
''' Import a registry file.
''' </summary>
Public Shared Function Import_RegFile(ByVal RegFile As String) As Boolean
If IO.File.Exists(RegFile) Then
Try
Dim Regedit As New Process()
Dim Regedit_Info As New ProcessStartInfo()
Regedit_Info.FileName = "Reg.exe"
Regedit_Info.Arguments = "Import " & """" & RegFile & """"
Regedit_Info.CreateNoWindow = True
Regedit_Info.WindowStyle = ProcessWindowStyle.Hidden
Regedit_Info.UseShellExecute = False
Regedit.StartInfo = Regedit_Info
Regedit.Start()
Regedit.WaitForExit()
If Regedit.ExitCode <> 0 Then
Regedit.Dispose()
Return False
Else
Regedit.Dispose()
Return True
End If
Catch ex As Exception
' MsgBox(ex.Message)
' Throw New Exception(ex.Message)
Return False
End Try
Else
' MsgBox("File don't exist")
Return False
End If
End Function
''' <summary>
''' Open Regedit at specific key.
''' </summary>
Public Shared Function Jump_To_Key(ByVal RegKey As String) As Boolean
RootKey = Get_Root_Key(RegKey)
KeyPath = RootKey.ToString & "\" & Get_Key_Path(RegKey)
If KeyPath.EndsWith("\") Then KeyPath = KeyPath.Substring(0, KeyPath.Length - 1)
Try
Set_Value("HKCU\Software\Microsoft\Windows\CurrentVersion\Applets\Regedit", "LastKey", "" & KeyPath & "", Microsoft.Win32.RegistryValueKind.String)
RootKey.Dispose()
Process.Start("Regedit.exe")
Return True
Catch ex As Exception
' MsgBox(ex.Message)
' Throw New Exception(ex.Message)
Return False
End Try
End Function
''' <summary>
''' Checks if a Key exist.
''' </summary>
Public Shared Function Exist_Key(ByVal RegKey As String) As Boolean
RootKey = Get_Root_Key(RegKey)
KeyPath = Get_Key_Path(RegKey)
If RootKey Is Nothing OrElse KeyPath Is Nothing Then Return False
If RootKey.OpenSubKey(KeyPath, False) Is Nothing Then
RootKey.Dispose()
Return False
Else
RootKey.Dispose()
Return True
End If
End Function
''' <summary>
''' Checks if a value exist.
''' </summary>
Public Shared Function Exist_Value(ByVal RegKey As String, ByVal RegValue As String) As Boolean
RootKey = Get_Root_Key(RegKey)
KeyPath = Get_Key_Path(RegKey)
Try
If RootKey.OpenSubKey(KeyPath, False).GetValue(RegValue) = String.Empty Then
RootKey.Dispose()
Return False
Else
RootKey.Dispose()
Return True
End If
Catch ex As Exception
' MsgBox(ex.Message)
' Throw New Exception(ex.Message)
Return False
End Try
End Function
''' <summary>
''' Check if a value have empty data.
''' </summary>
Public Shared Function Exist_Data(ByVal RegKey As String, ByVal RegValue As String) As Boolean
RootKey = Get_Root_Key(RegKey)
KeyPath = RootKey.ToString & "\" & Get_Key_Path(RegKey)
Try
If My.Computer.Registry.GetValue(KeyPath, RegValue, Nothing) = Nothing Then
RootKey.Dispose()
Return False
Else
RootKey.Dispose()
Return True
End If
Catch ex As Exception
' MsgBox(ex.Message)
' Throw New Exception(ex.Message)
Return False
End Try
End Function
''' <summary>
''' Copy a key tree to another location of the registry.
''' </summary>
Public Shared Function Copy_Key(ByVal OldRootKey As String, _
ByVal OldPath As String, _
ByVal OldName As String, _
ByVal NewRootKey As String, _
ByVal NewPath As String, _
ByVal NewName As String) As Boolean
If OldPath Is Nothing Then OldPath = ""
If NewRootKey Is Nothing Then NewRootKey = OldRootKey
If NewPath Is Nothing Then NewPath = ""
If NewName Is Nothing Then NewName = ""
If OldRootKey.EndsWith("\") Then OldRootKey = OldRootKey.Substring(0, OldRootKey.Length - 1)
If NewRootKey.EndsWith("\") Then NewRootKey = NewRootKey.Substring(0, NewRootKey.Length - 1)
If OldPath.StartsWith("\") Then OldPath = OldPath.Substring(1, OldPath.Length - 1)
If OldPath.EndsWith("\") Then OldPath = OldPath.Substring(0, OldPath.Length - 1)
If NewPath.StartsWith("\") Then NewPath = NewPath.Substring(1, NewPath.Length - 1)
If NewPath.EndsWith("\") Then NewPath = NewPath.Substring(0, NewPath.Length - 1)
If OldName.StartsWith("\") Then OldName = OldName.Substring(1, OldName.Length - 1)
If OldName.EndsWith("\") Then OldName = OldName.Substring(0, OldName.Length - 1)
If NewName.StartsWith("\") Then NewName = NewName.Substring(1, NewName.Length - 1)
If NewName.EndsWith("\") Then NewName = NewName.Substring(0, NewName.Length - 1)
Dim OrigRootKey As Microsoft.Win32.RegistryKey = Get_Root_Key(OldRootKey)
Dim DestRootKey As Microsoft.Win32.RegistryKey = Get_Root_Key(NewRootKey)
Dim oldkey As Microsoft.Win32.RegistryKey = OrigRootKey.OpenSubKey(OldPath + "\" + OldName, True)
Dim newkey As Microsoft.Win32.RegistryKey = DestRootKey.OpenSubKey(NewPath, True).CreateSubKey(NewName)
Reg_Copy_SubKeys(oldkey, newkey)
Return True
End Function
Private Shared Sub Reg_Copy_SubKeys(OrigKey As Microsoft.Win32.RegistryKey, DestKey As Microsoft.Win32.RegistryKey)
Dim ValueNames As String() = OrigKey.GetValueNames()
Dim SubKeyNames As String() = OrigKey.GetSubKeyNames()
For i As Integer = 0 To ValueNames.Length - 1
Application.DoEvents()
DestKey.SetValue(ValueNames(i), OrigKey.GetValue(ValueNames(i)))
Next
For i As Integer = 0 To SubKeyNames.Length - 1
Application.DoEvents()
Reg_Copy_SubKeys(OrigKey.OpenSubKey(SubKeyNames(i), True), DestKey.CreateSubKey(SubKeyNames(i)))
Next
End Sub
''' <summary>
''' Copy a value with their data to another location of the registry.
''' If the Key don't exist it will be created automatically.
''' </summary>
Public Shared Function Copy_Value(ByVal RegKey As String, ByVal RegValue As String, _
ByVal NewRegKey As String, ByVal NewRegValue As String) As Boolean
Dim OldRootKey As String = Get_Root_Key(RegKey).ToString
Dim OldKeyPath As String = OldRootKey & "\" & Get_Key_Path(RegKey)
Dim NewRootKey As String = Get_Root_Key(NewRegKey).ToString
Dim NewKeyPath As String = NewRootKey & "\" & Get_Key_Path(NewRegKey)
Dim RegData = Get_Value(OldKeyPath, RegValue)
Try
Set_Value(NewKeyPath, NewRegValue, RegData, Microsoft.Win32.RegistryValueKind.Unknown)
Return True
Catch ex As Exception
' MsgBox(ex.Message)
' Throw New Exception(ex.Message)
Return False
End Try
End Function
''' <summary>
''' Valid User identifiers for Regini.exe command.
''' </summary>
Public Enum RegUserAccess As Short
Administrators_Full_Access = 1
Administrators_Read_Access = 2
Administrators_Read_and_Write_Access = 3
Administrators_Read_Write_and_Delete_Access4
Administrators_Read_Write_and_Execute_Access = 20
Creator_Full_Access = 5
Creator_Read_and_Write_Access = 6
Interactive_User_Full_Access = 21
Interactive_User_Read_and_Write_Access = 22
Interactive_User_Read_Write_and_Delete_Access = 23
Power_Users_Full_Access = 11
Power_Users_Read_and_Write_Access = 12
Power_Users_Read_Write_and_Delete_Access = 13
System_Full_Access = 17
System_Operators_Full_Access = 14
System_Operators_Read_and_Write_Access = 15
System_Operators_Read_Write_and_Delete_Access = 16
System_Read_Access = 19
System_Read_and_Write_Access = 18
World_Full_Access = 7
World_Read_Access = 8
World_Read_and_Write_Access = 9
World_Read_Write_and_Delete_Access = 10
End Enum
''' <summary>
''' Modify the User permissions of a registry key.
''' </summary>
Public Shared Function Set_UserAccess_Key(ByVal RegKey As String, ByVal RegUserAccess() As RegUserAccess) As Boolean
Dim PermissionString As String = String.Empty
RootKey = Get_Root_Key(RegKey)
KeyPath = RootKey.ToString & "\" & Get_Key_Path(RegKey)
If KeyPath.EndsWith("\") Then KeyPath = KeyPath.Substring(0, KeyPath.Length - 1)
For Each user In RegUserAccess
' Application.DoEvents()
PermissionString += " " & user
Next
PermissionString = "[" & PermissionString & "]"
PermissionString = PermissionString.Replace("[ ", "[")
Try
Using TextFile As New IO.StreamWriter(System.IO.Path.GetTempPath() & "Regini.ini", False, System.Text.Encoding.Default)
TextFile.WriteLine("""" & KeyPath & """" & " " & PermissionString)
End Using
Dim Regini As New Process()
Dim Regini_Info As New ProcessStartInfo()
Regini_Info.FileName = "Regini.exe"
Regini_Info.Arguments = """" & System.IO.Path.GetTempPath() & "Regini.ini" & """"
Regini_Info.CreateNoWindow = True
Regini_Info.WindowStyle = ProcessWindowStyle.Hidden
Regini_Info.UseShellExecute = False
Regini.StartInfo = Regini_Info
Regini.Start()
Regini.WaitForExit()
If Regini.ExitCode <> 0 Then
RootKey.Dispose()
Regini.Dispose()
Return False
Else
RootKey.Dispose()
Regini.Dispose()
Return True
End If
Catch ex As Exception
' MsgBox(ex.Message)
' Throw New Exception(ex.Message)
Return False
End Try
End Function
' Returns the RootKey formatted
Private Shared Function Get_Root_Key(ByVal RegKey As String) As Microsoft.Win32.RegistryKey
Select Case RegKey.ToUpper.Split("\").First
Case "HKCR", "HKEY_CLASSES_ROOT" : Return Microsoft.Win32.Registry.ClassesRoot
Case "HKCC", "HKEY_CURRENT_CONFIG" : Return Microsoft.Win32.Registry.CurrentConfig
Case "HKCU", "HKEY_CURRENT_USER" : Return Microsoft.Win32.Registry.CurrentUser
Case "HKLM", "HKEY_LOCAL_MACHINE" : Return Microsoft.Win32.Registry.LocalMachine
Case "HKEY_PERFORMANCE_DATA" : Return Microsoft.Win32.Registry.PerformanceData
Case Else : Return Nothing
End Select
End Function
' Returns the KeyPath formatted
Private Shared Function Get_Key_Path(ByVal RegKey As String) As String
If RegKey Is Nothing Then Return Nothing
Dim Path As String = String.Empty
For i As Integer = 1 To RegKey.Split("\").Length - 1
' Application.DoEvents()
Path &= RegKey.Split("\")(i) & "\"
Next
If Not Path.Contains("\") Then Path = Path & "\"
Path = Path.Substring(0, Path.LastIndexOf("\"))
Return Path
End Function
End Class
#End Region
#End Region

Why does DirectoryEntry("WinNT://") not show group everyone?

The below function (is supposed to) lists all groups on the local machine.
Now the question: Why does the "everyone" group not show up ?
If I change directory permissions as user, I see the "everyone" group, so it must be there, somewhere.
Public Shared Function GetAllGroups() As DataTable
Return GetAllGroups(System.Environment.MachineName)
End Function
' Tools.Permissions.Local.GetAllGroups() '
Public Shared Function GetAllGroups(ByVal strDomain As String) As DataTable
Dim dt As New DataTable
Dim dr As DataRow = Nothing
Try
Dim bException As Boolean = False
Dim deLocalMachine As System.DirectoryServices.DirectoryEntry = New System.DirectoryServices.DirectoryEntry("WinNT://" + strDomain)
'Dim deRootObject As System.DirectoryServices.DirectoryEntry = GetDirectoryEntry(strPath, strUserName, strPassword, bException) '
If bException Then
Return Nothing
End If
For Each child As System.DirectoryServices.DirectoryEntry In deLocalMachine.Children
Try
If StringComparer.OrdinalIgnoreCase.Equals(child.SchemaClassName, "group") Then
If Not dt.Columns.Contains("Members") Then
dt.Columns.Add("Members", GetType(System.String))
End If
For Each strPropertyName As String In child.Properties.PropertyNames
If Not dt.Columns.Contains(strPropertyName) Then
dt.Columns.Add(strPropertyName, GetType(System.String))
End If
Next strPropertyName
dr = dt.NewRow
Dim strMembers As String = ""
For Each member As Object In DirectCast(child.Invoke("Members"), IEnumerable)
Using memberEntry As New System.DirectoryServices.DirectoryEntry(member)
Try
strMembers += memberEntry.Properties("Name").Value.ToString() + Environment.NewLine
Console.WriteLine(memberEntry.Path)
Catch exFixMeIsNotNullNotWorking As Exception
End Try
End Using
Next
dr("Members") = strMembers
For Each strPropertyName As String In child.Properties.PropertyNames
If StringComparer.OrdinalIgnoreCase.Equals(strPropertyName, "objectSid") Then
Dim strSID As String = ""
Try
Dim sidThisSid As New System.Security.Principal.SecurityIdentifier(child.Properties(strPropertyName).Value, 0)
strSID = sidThisSid.ToString()
' http://stackoverflow.com/questions/1040623/convert-a-username-to-a-sid-string-in-c-net '
' NTAccount ntAccount = (NTAccount)sid.Translate( typeof( NTAccount ) ); '
' Dim ntAccount As Security.Principal.NTAccount = CType(sidThisSid.Translate(GetType(Security.Principal.NTAccount)), Security.Principal.NTAccount) '
Catch ex As Exception
End Try
dr(strPropertyName) = strSID
Else
dr(strPropertyName) = child.Properties(strPropertyName).Value.ToString()
End If
Next strPropertyName
dt.Rows.Add(dr)
End If
Catch ex As Exception ' Don't finish just because one fails
Console.WriteLine(ex.Message.ToString & vbLf & vbLf & ex.StackTrace.ToString, MsgBoxStyle.Critical, "FEHLER ...")
End Try
Next
Catch ex As Exception
Console.WriteLine(ex.Message.ToString & vbLf & vbLf & ex.StackTrace.ToString, MsgBoxStyle.Critical, "FEHLER ...")
End Try
Return dt
End Function ' ListEverything

The Everyone group isn't a standard group but rather an implicit group or built-in principal. If you open your local "Users and Groups" you won't see it listed there either. The same is true of other "groups" such as Authenticated Users. If you want to access these you need to use the System.Security.Principal.WellKnownSidType enumeration. This Windows 2008 article is really relevant for older versions of Windows, too.