[vb6]

[Dardino]

ho questa porzione di codice che vedete...

Modulo1.bas

Global Const REG_RESOURCE_LIST = &H8
Global Const REG_RESOURCE_REQUIREMENTS_LIST = &HA
Global Const REG_SZ = &H1

Public Const SYNCHRONIZE = &H100000
Public Const READ_CONTROL = &H20000
Public Const STANDARD_RIGHTS_READ = (READ_CONTROL)
Public Const KEY_QUERY_VALUE = &H1
Public Const KEY_ENUMERATE_SUB_KEYS = &H8
Public Const KEY_NOTIFY = &H10
Public Const KEY_WRITE = &H20006
Public Const KEY_ALL_ACCESS = &H2003F
Public Const KEY_READ = ((STANDARD_RIGHTS_READ Or KEY_QUERY_VALUE Or KEY_ENUMERATE_SUB_KEYS Or KEY_NOTIFY) And (Not SYNCHRONIZE))

Public Declare Function RegDeleteValue Lib "advapi32.dll" Alias "RegDeleteValueA" (ByVal hKey As Long, ByVal lpValueName As String) As Long
Public Declare Function RegCreateKey Lib "advapi32.dll" Alias "RegCreateKeyA" (ByVal hKey As Long, ByVal lpSubKey As String, phkResult As Long) As Long
Public Declare Function RegOpenKey Lib "advapi32.dll" Alias "RegOpenKeyA" (ByVal hKey As Long, ByVal lpSubKey As String, phkResult As Long) As Long
Public Declare Function RegCloseKey Lib "advapi32.dll" (ByVal hKey As Long) As Long
Public Declare Function RegDeleteKey Lib "advapi32.dll" Alias "RegDeleteKeyA" (ByVal hKey As Long, ByVal lpSubKey As String) As Long
Public Declare Function RegCreateKeyEx Lib "advapi32.dll" Alias "RegCreateKeyExA" (ByVal hKey As Long, ByVal lpSubKey As String, ByVal Reserved As Long, ByVal lpClass As String, ByVal dwOptions As Long, ByVal samDesired As Long, lpSecurityAttributes As Any, phkResult As Long, lpdwDisposition As Long) As Long
Public Declare Function RegOpenKeyEx Lib "advapi32.dll" Alias "RegOpenKeyExA" (ByVal hKey As Long, ByVal lpSubKey As String, ByVal Reserved As Long, ByVal samDesired As Long, phkResult As Long) As Long
Public Declare Function RegQueryValueEx Lib "advapi32.dll" Alias "RegQueryValueExA" (ByVal hKey As Long, ByVal lpValueName As String, ByVal lpReserved As Long, lpType As Long, lpData As Any, lpcbData As Long) As Long
Public Declare Function RegSetValueEx Lib "advapi32.dll" Alias "RegSetValueExA" (ByVal hKey As Long, ByVal lpValueName As String, ByVal Reserved As Long, ByVal dwType As Long, lpData As Any, ByVal cbData As Long) As Long
Public Declare Function RegEnumKeyEx Lib "advapi32.dll" Alias "RegEnumKeyExA" (ByVal hKey As Long, ByVal dwIndex As Long, ByVal lpName As String, lpcbName As Long, ByVal lpReserved As Long, ByVal lpClass As String, lpcbClass As Long, lpftLastWriteTime As Any) As Long
Public Declare Function RegEnumValue Lib "advapi32.dll" Alias "RegEnumValueA" (ByVal hKey As Long, ByVal dwIndex As Long, ByVal lpValueName As String, lpcbValueName As Long, ByVal lpReserved As Long, lpType As Long, lpData As Any, lpcbData As Long) As Long
Public Declare Function RegNotifyChangeKeyValue Lib "advapi32.dll" (ByVal hKey As Long, ByVal bWatchSubtree As Boolean, ByVal dwNotifyFilter As Long, ByVal hEvent As Long, ByVal fAsynchronous As Boolean) As Long
Public Declare Function RegRestoreKey Lib "advapi32.dll" Alias "RegRestoreKeyA" (ByVal hKey As Long, ByVal lpFile As String, ByVal dwFlags As Long) As Long  ' Main function
Public Declare Function RegSaveKey Lib "advapi32.dll" Alias "RegSaveKeyA" (ByVal hKey As Long, ByVal lpFile As String, lpSecurityAttributes As Any) As Long

Button1_onClick
Dim rc, KeyRoot, KeyName, hKey, KeyDesc, tmpVal, KeyValSize, keyval
    KeyRoot = HKEY_LOCAL_MACHINE
    KeyName = "SYSTEM\CurrentControlSet\Control\Print\Environments\Windows NT x86\Drivers\Version-3\HP Color LaserJet 5/5M PS"
    KeyDesc = "DriverVersion"
    tmpVal = String$(8, 0)
    KeyValSize = 8 'l'ho impostato a 8 perchè è la lunghezza reale della voce di registro
    rc = RegOpenKeyEx(KeyRoot, KeyName, 0, KEY_ALL_ACCESS, hKey)
    MsgBox rc
        Dim lResult As Long
        lResult = RegQueryValueEx(hKey, _
                        KeyDesc, _
                        0, _
                        REG_BINARY, _
                        tmpVal, _
                        KeyValSize)
                        
    If (Asc(Mid(tmpVal, KeyValSize, 1)) = 0) Then
        tmpVal = Left(tmpVal, KeyValSize - 1)
    Else
        tmpVal = Left(tmpVal, KeyValSize)
    End If
    MsgBox tmpVal

il valore della chiave di registro sono i seguenti 8 byte:
00, C0, 4B, 7D, 0F, 4C, BF, 01

se provo ad eseguire l'applicazione mi da il seguente errore:
Errore di Runtime 458
la variabile utilizza un tipo di automazione non supprtato in visualbasic

e la variabile incriminata è tmpVal
sapreste spiegarmi il perchè?

Grazie
Ciao

[Dardino]

mi so scordato il titolo

[MMarzia]

ma quante ne vuoi aprire? :master:
questa la chiudo, la prossima vota stai più attento con i titolo.. al limite editiamo noi