[VB.NET] Utilizzo hDC di PictureBox per estrazione di icone

[GrG]

Salve,
posto qui perchè ho dei problemi con VB.NET 2008.

Per svariato tempo ho programmato in visual basic 6 e oggi ho deciso di cercare di convertire un progetto di vb6 in vb.net.

Ora mi trovo di fronte a questo problema.

Dunque, utilizzo una sub che si basa su un'API per estrarre le icone dai file e dagli eseguibili.

Questa è la sub:

Private Sub GetDefaultIcon(FileName As String, Picture_hDC As Long)
Dim TempFileName As String 'Never manipulate an input unless it doubles as an output
Dim lngError As Long 'For receiving error numbers
Dim lngRegKeyHandle As Long 'Stores the "handle" of the registry key that is currently open
Dim strProgramName As String 'Stores the contents of the first registry key
Dim strDefaultIcon As String 'Stores the contents of the second registry key
Dim lngStringLength As Long 'Sets / Returns the length of the output string
Dim lngIconNumber As Long 'Stores the icon number within a file
Dim lngIcon As Long 'Stores the "Icon Handle" for the default icon
Dim intN As Integer 'For any temporary numbers

TempFileName = Right(FileName, Len(FileName) - InStrRev(FileName, ".") + 1)

If LCase(TempFileName) = ".exe" Then
strDefaultIcon = Space(260)
lngStringLength = GetSystemDirectory(strDefaultIcon, 260)
strDefaultIcon = Left(strDefaultIcon, lngStringLength) & "\SHELL32.DLL"
lngIconNumber = 2
GoTo Draw_Icon
End If

lngError = RegOpenKey(HKEY_CLASSES_ROOT, TempFileName, lngRegKeyHandle)
If lngError Then GoTo No_Icon 'we do not even have a valid extension so lets NOT try to find an icon!
lngStringLength = 260
strProgramName = Space$(260) 'Make space for the incoming string
'Get the key value:
lngError = RegQueryValueEx(lngRegKeyHandle, vbNullString, 0, 0, strProgramName, lngStringLength)
If lngError Then 'if there's an error then BIG TROUBLE so lets use the normal "windows" icon
lngError = RegCloseKey(lngRegKeyHandle) 'the world may be about to end (or just an error) but we'll clean up anyway
GoTo No_Icon
End If
lngError = RegCloseKey(lngRegKeyHandle) 'if this generates an error then we can't do anything about it anyway
strProgramName = Left(strProgramName, lngStringLength - 1) 'Cut the name down to size

'Use the value of the last key in the name of the next one (strProgramName)
lngError = RegOpenKey(HKEY_CLASSES_ROOT, strProgramName & "\DefaultIcon", lngRegKeyHandle)
If lngError Then GoTo No_Icon 'there is no icon for this extension so lets NOT try to load what doesn't exist!
'The rest is just the same as before
lngStringLength = 260
strDefaultIcon = Space$(260)
lngError = RegQueryValueEx(lngRegKeyHandle, vbNullString, 0, 0, strDefaultIcon, lngStringLength)
If lngError Then
lngError = RegCloseKey(lngRegKeyHandle)
GoTo No_Icon
End If
lngError = RegCloseKey(lngRegKeyHandle)
strDefaultIcon = Trim$(Left(strDefaultIcon, lngStringLength - 1))

intN = InStrRev(strDefaultIcon, ",") 'Find the commer
If intN < 1 Then GoTo No_Icon 'We MUST have an icon number and it will be after the ",": NO COMMA NO DEFAULT ICON
lngIconNumber = Trim$(Right(strDefaultIcon, Len(strDefaultIcon) - intN)) 'What number is after the comma
strDefaultIcon = Trim$(Left(strDefaultIcon, intN - 1)) 'We only want what's before the comma in the file name

Draw_Icon:
lngIcon = ExtractIcon(App.hInstance, strDefaultIcon, lngIconNumber) 'Extract the Icon
If lngIcon = 1 Or lngIcon = 0 Then GoTo No_Icon 'if 1 or 0 then after all that the Icon Could not be retrieved

lngError = DrawIcon(Picture_hDC, 10, 10, lngIcon) 'Draw the icon in the box
'If that was unsucessful then we can't do anything about it now!
lngError = DestroyIcon(lngIcon)
'Again we can't correct any errors now
Exit Sub
No_Icon:
'No icon could be found so we use the normal windows icon
'This icon is held in shell32.dll in the system directory, Icon 0
strDefaultIcon = Space(260)
lngStringLength = GetSystemDirectory(strDefaultIcon, 260)
strDefaultIcon = Left(strDefaultIcon, lngStringLength) & "\SHELL32.DLL"
lngIconNumber = 0
GoTo Draw_Icon
End Sub

Dunque da vb6 semplicemente la richiamavo così:
Call GetDefaultIcon("C:\Percorso\file.png", Picture1.hDC)

Ma in vb.net non posso farlo perchè hDC pare non esista.. avevo letto in giro di utenti che consigliavano di usare Panel, che ho visto sembrano essere come gli iframe di vb6, solo che non capisco come fare..

Spero che qualcuno mi aiuti, grazie.

[GrG]

Comunque più in generale mi servirebbe qualche esempio o suggerimento per estrarre le icone da file ed eseguibile e visualizzarle in una picture.

In vb6 usavo quella sub che ora sto cercando di convertire in codice per vb.net, ma se qualcuno di voi mi sa consigliare qualche altra funzione ben venga. (Le api da usare presumo siano le stesse, ma essendo nuovo di vb.net il problema è l'utilizzo)

[GrG]

Ho risolto utilizzando:

NomePicture.Image = Drawing.Icon.ExtractAssociatedIcon(“PercorsoFile”) .ToBit