Posts by XL-Dennis

Option Explicit


Type FILETIME
     dwLowDateTime As Long
     dwHighDateTime As Long
End Type


Declare Function RegOpenKeyEx _
        Lib "advapi32.dll" _
        Alias "RegOpenKeyExA" _
      ( _
        ByVal hKey As Long, _
        ByVal lpSubKey As String, _
        ByVal ulOptions As Long, _
        ByVal samDesired As Long, _
        phkResult As Long _
      ) _
        As Long
        
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 FILETIME _
       ) _
        As Long
        
Declare Function RegCloseKey _
        Lib "advapi32.dll" _
      ( _
        ByVal hKey As Long _
      ) _
        As Long




Public Function fncEnumInstalledPrintersReg() As Collection
 'returns a collection of the currently installed printers as
 'it appears in the Windows Registry
 '
 'variable declarations
  Dim tmpFunctionResult As Boolean
  Dim aFileTimeStruc As FILETIME
  Dim AddressofOpenKey As Long, aPrinterName As String
  Dim aPrinterIndex As Integer, aPrinterNameLen As Long
 '
 'required API constants
  Const KEY_ENUMERATE_SUB_KEYS = &H8
  Const HKEY_LOCAL_MACHINE = &H80000002
 '
 'initialise the result of the function to a New (empty) Collection object
  Set fncEnumInstalledPrintersReg = New Collection
 'initialise other variables
  aPrinterIndex = 0
 '
 'open the Windows Registry key that contains the subkeys with the list
 'of currently installed printers
 'This key should be located at: "SYSTEM\CURRENTCONTROLSET\CONTROL\PRINT\PRINTERS"
  tmpFunctionResult = Not CBool _
                     ( _
                       RegOpenKeyEx _
                                  ( _
                                    hKey:=HKEY_LOCAL_MACHINE, _
                                    lpSubKey:="SYSTEM\CURRENTCONTROLSET\CONTROL\PRINT\PRINTERS", _
                                    ulOptions:=0, _
                                    samDesired:=KEY_ENUMERATE_SUB_KEYS, _
                                    phkResult:=AddressofOpenKey _
                                  ) _
                     )
 '
 'if we could not open/find the "SYSTEM\CURRENTCONTROLSET\CONTROL\PRINT\PRINTERS"
 'Registry key, exit the function; return an empty collection
  If tmpFunctionResult = False Then GoTo ExitFunction
  
 'Loop through all the sub-keys in the Registry key we just opened, and read the
 'entries for the installed printers
  Do
    '
    'pre-initialise a string to hold the first printer name
     aPrinterNameLen = 255                             'the length of the string should be
                                                       'large enough to hold any printer name
     aPrinterName = String(aPrinterNameLen, CStr(0))
    '
    'read the value of the next registry sub-key
     tmpFunctionResult = Not CBool _
                      ( _
                        RegEnumKeyEx _
                                  ( _
                                    hKey:=AddressofOpenKey, _
                                    dwIndex:=aPrinterIndex, _
                                    lpName:=aPrinterName, _
                                    lpcbName:=aPrinterNameLen, _
                                    lpReserved:=0, _
                                    lpClass:=vbNullString, _
                                    lpcbClass:=0, _
                                    lpftLastWriteTime:=aFileTimeStruc _
                                  ) _
                      )
    'prepare to read the next sub-key
     aPrinterIndex = aPrinterIndex + 1
    '
    'for as long as there is a sub-key to read the RegEnumKeyEx function
    'will return tmpFunctionResult=True. If the result is False, there are
    'no more printers and therefore we can exit the loop
     If tmpFunctionResult = False Then Exit Do
    '
    'trim all trailing Null-Strings from the name of the printer
    '(the aPrinterNameLen variable has been updated to indicate the
    ' actual length of the printer name)
     aPrinterName = Left(aPrinterName, aPrinterNameLen)
     
    'add the name of the printer that we have just read in the
    'fncEnumInstalledPrintersReg collection
     On Error Resume Next
     fncEnumInstalledPrintersReg.Add aPrinterName
     On Error GoTo 0
  Loop
 '
 'close the Windows Registry key that we have opened for reading the collection
 'installed printers
  Call RegCloseKey(AddressofOpenKey)
 '
Exit Function
ExitFunction:
  If Not AddressofOpenKey = 0 Then Call RegCloseKey(AddressofOpenKey)
  Set fncEnumInstalledPrintersReg = Nothing
End Function


'Here is the Sub that You insert Your code to check.


Sub test()
Dim aPrinter As Variant
Dim stPrinter As String


'The name of the printer You want to check up.
stPrinter = "DeskJet 1600CM"


For Each aPrinter In fncEnumInstalledPrintersReg
      If stPrinter = aPrinter Then MsgBox "The Printer is installed."
Next aPrinter


End Sub