Friday, November 18, 2005
  
Option Explicit

Global gstrprinter As String

Declare Function GetProfileString Lib "kernel32" _
Alias "GetProfileStringA" _
(ByVal lpAppName As String, _
ByVal lpKeyName As String, _
ByVal lpDefault As String, _
ByVal lpReturnedString As String, _
ByVal nSize As Long) As Long

Declare Function WriteProfileString Lib "kernel32" _
Alias "WriteProfileStringA" _
(ByVal lpszSection As String, _
ByVal lpszKeyName As String, _
ByVal lpszString As String) As Long

Declare Function SendMessage Lib "user32" _
Alias "SendMessageA" _
(ByVal hwnd As Long, _
ByVal wMsg As Long, _
ByVal wParam As Long, _
lParam As String) As Long

Public Const HWND_BROADCAST = &HFFFF
Public Const WM_WININICHANGE = &H1A

Public Type OSVERSIONINFO
dwOSVersionInfoSize As Long
dwMajorVersion As Long
dwMinorVersion As Long
dwBuildNumber As Long
dwPlatformId As Long
szCSDVersion As String * 128
End Type

Declare Function GetVersionExA Lib "kernel32" _
(lpVersionInformation As OSVERSIONINFO) As Integer

Public Declare Function OpenPrinter Lib "winspool.drv" _
Alias "OpenPrinterA" _
(ByVal pPrinterName As String, _
phPrinter As Long, _
pDefault As PRINTER_DEFAULTS) As Long

Public Declare Function SetPrinter Lib "winspool.drv" _
Alias "SetPrinterA" _
(ByVal hPrinter As Long, _
ByVal Level As Long, _
pPrinter As Any, _
ByVal Command As Long) As Long

Public Declare Function GetPrinter Lib "winspool.drv" _
Alias "GetPrinterA" _
(ByVal hPrinter As Long, _
ByVal Level As Long, _
pPrinter As Any, _
ByVal cbBuf As Long, _
pcbNeeded As Long) As Long

Public Declare Function lstrcpy Lib "kernel32" _
Alias "lstrcpyA" _
(ByVal lpString1 As String, _
ByVal lpString2 As Any) As Long

Public Declare Function ClosePrinter Lib "winspool.drv" _
(ByVal hPrinter As Long) As Long

Public Declare Function GetLastError Lib "kernel32" () As Long

' constants for DEVMODE structure
Public Const CCHDEVICENAME = 32
Public Const CCHFORMNAME = 32

' constants for DesiredAccess member of PRINTER_DEFAULTS
Public Const STANDARD_RIGHTS_REQUIRED = &HF0000
Public Const PRINTER_ACCESS_ADMINISTER = &H4
Public Const PRINTER_ACCESS_USE = &H8
Public Const PRINTER_ALL_ACCESS = (STANDARD_RIGHTS_REQUIRED Or _
PRINTER_ACCESS_ADMINISTER Or PRINTER_ACCESS_USE)

' constant that goes into PRINTER_INFO_5 Attributes member
' to set it as default
Public Const PRINTER_ATTRIBUTE_DEFAULT = 4

Public Type DEVMODE
dmDeviceName As String * CCHDEVICENAME
dmSpecVersion As Integer
dmDriverVersion As Integer
dmSize As Integer
dmDriverExtra As Integer
dmFields As Long
dmOrientation As Integer
dmPaperSize As Integer
dmPaperLength As Integer
dmPaperWidth As Integer
dmScale As Integer
dmCopies As Integer
dmDefaultSource As Integer
dmPrintQuality As Integer
dmColor As Integer
dmDuplex As Integer
dmYResolution As Integer
dmTTOption As Integer
dmCollate As Integer
dmFormName As String * CCHFORMNAME
dmLogPixels As Integer
dmBitsPerPel As Long
dmPelsWidth As Long
dmPelsHeight As Long
dmDisplayFlags As Long
dmDisplayFrequency As Long
dmICMMethod As Long ' // Windows

5 only
dmICMIntent As Long ' // Windows

5 only
dmMediaType As Long ' // Windows

5 only
dmDitherType As Long ' // Windows

5 only
dmReserved1 As Long ' // Windows

5 only
dmReserved2 As Long ' // Windows

5 only
End Type

Public Type PRINTER_INFO_5
pPrinterName As String
pPortName As String
Attributes As Long
DeviceNotSelectedTimeout As Long
TransmissionRetryTimeout As Long
End Type

Public Type PRINTER_DEFAULTS
pDatatype As Long
pDevMode As DEVMODE
DesiredAccess As Long
End Type

'Form Code
Private Function PtrCtoVbString(Add As Long) As String
Dim sTemp As String * 512, X As Long

'x = lstrcpy(sTemp, Add)
If (InStr(1, sTemp, Chr(0)) = 0) Then
PtrCtoVbString = ""
Else
PtrCtoVbString = Left(sTemp, InStr(1, sTemp, Chr(0)) - 1)
End If
End Function

Private Sub SetDefaultPrinter(ByVal PrinterName As String, _
ByVal DriverName As String, ByVal PrinterPort As String)
Dim DeviceLine As String
Dim r As Long
Dim l As Long
DeviceLine = PrinterName & "," & DriverName & "," & PrinterPort
' Store the new printer information in the [WINDOWS] section of
' the WIN.INI file for the DEVICE= item
r = WriteProfileString("windows", "Device", DeviceLine)
' Cause all applications to reload the INI file:
l = SendMessage(HWND_BROADCAST, WM_WININICHANGE, 0, "windows")
End Sub

Private Sub Win

5SetDefaultPrinter()
Dim Handle As Long 'handle to printer
Dim PrinterName As String
Dim pd As PRINTER_DEFAULTS
Dim X As Long
Dim need As Long ' bytes needed
Dim pi5 As PRINTER_INFO_5 ' your PRINTER_INFO structure
Dim LastError As Long

' determine which printer was selected
PrinterName = gstrprinter 'List1.ItemData(List1.ListIndex)
' none - exit
If PrinterName = "" Then
Exit Sub
End If

' set the PRINTER_DEFAULTS members
pd.pDatatype = 0&
pd.DesiredAccess = PRINTER_ALL_ACCESS

' Get a handle to the printer
X = OpenPrinter(PrinterName, Handle, pd)
' failed the open
If X = False Then
'error handler code goes here
Exit Sub
End If

' Make an initial call to GetPrinter, requesting Level 5
' (PRINTER_INFO_5) information, to determine how many bytes
' you need
X = GetPrinter(Handle, 5, ByVal 0&, 0, need)
' don't want to check GetLastError here - it's supposed to fail
' with a 122 - ERROR_INSUFFICIENT_BUFFER
' redim t as large as you need
ReDim t((need \ 4)) As Long

' and call GetPrinter for keepers this time
X = GetPrinter(Handle, 5, t(0), need, need)
' failed the GetPrinter
If X = False Then
'error handler code goes here
Exit Sub
End If

' set the members of the pi5 structure for use with SetPrinter.
' PtrCtoVbString copies the memory pointed at by the two string
' pointers contained in the t() array into a Visual Basic string.
' The other three elements are just DWORDS (long integers) and
' don't require any conversion
pi5.pPrinterName = PtrCtoVbString(t(0))
pi5.pPortName = PtrCtoVbString(t(1))
pi5.Attributes = t(2)
pi5.DeviceNotSelectedTimeout = t(3)
pi5.TransmissionRetryTimeout = t(4)

' this is the critical flag that makes it the default printer
pi5.Attributes = PRINTER_ATTRIBUTE_DEFAULT

' call SetPrinter to set it
X = SetPrinter(Handle, 5, pi5, 0)
' failed the SetPrinter
If X = False Then
MsgBox "SetPrinterFailed. Error code: " & GetLastError()
Exit Sub
End If

' and close the handle
ClosePrinter (Handle)

End Sub

Private Sub GetDriverAndPort(ByVal Buffer As String, DriverName As String, PrinterPort As String)
Dim iDriver As Integer
Dim iPort As Integer
DriverName = ""
PrinterPort = ""

'The driver name is first in the string terminated by a comma
iDriver = InStr(Buffer, ",")
If iDriver > 0 Then

'Strip out the driver name
DriverName = Left(Buffer, iDriver - 1)

'The port name is the second entry after the driver name
'separated by commas.
iPort = InStr(iDriver + 1, Buffer, ",")

If iPort > 0 Then
'Strip out the port name
PrinterPort = Mid(Buffer, iDriver + 1, _
iPort - iDriver - 1)
End If
End If
End Sub

Private Sub ParseList(lstCtl As Control, ByVal Buffer As String)
Dim i As Integer
Do
i = InStr(Buffer, Chr(0))
If i > 0 Then
lstCtl.RowSource = lstCtl.RowSource & Left(Buffer, i - 1) & ";"
'lstCtl.AddItem left(Buffer, i - 1)
Buffer = Mid(Buffer, i + 1)
Else
'lstCtl.RowSource = lstCtl.RowSource & Buffer & ";" 'lstCtl.AddItem Buffer
Buffer = ""
End If
Loop While i > 0
End Sub

Private Sub WinNTSetDefaultPrinter()
Dim Buffer As String
Dim DeviceName As String
Dim DriverName As String
Dim PrinterPort As String
Dim PrinterName As String
Dim r As Long
If Len("" & gstrprinter) > 0 Then
'Get the printer information for the currently selected
'printer in the list. The information is taken from the
'WIN.INI file.
Buffer = Space(1024)
PrinterName = gstrprinter
r = GetProfileString("PrinterPorts", PrinterName, "", Buffer, Len(Buffer))

'Parse the driver name and port name out of the buffer
GetDriverAndPort Buffer, DriverName, PrinterPort
If DriverName <> "" And PrinterPort <> "" Then
SetDefaultPrinter gstrprinter, DriverName, PrinterPort
End If
End If
End Sub

Sub SetPrinters()
'Returns the Windows version to retrieve the printer
Dim osinfo As OSVERSIONINFO
Dim retvalue As Integer

osinfo.dwOSVersionInfoSize = 148
osinfo.szCSDVersion = Space$(128)
retvalue = GetVersionExA(osinfo)

If osinfo.dwMajorVersion = 3 And osinfo.dwMinorVersion = 51 And osinfo.dwBuildNumber = 1057 And osinfo.dwPlatformId = 2 Then
Call WinNTSetDefaultPrinter
ElseIf osinfo.dwMajorVersion = 4 And osinfo.dwMinorVersion = 0 And osinfo.dwBuildNumber = 6710

814 And osinfo.dwPlatformId = 1 Then
Call Win

5SetDefaultPrinter
ElseIf osinfo.dwMajorVersion = 4 And osinfo.dwMinorVersion = 0 And osinfo.dwBuildNumber = 1381 And osinfo.dwPlatformId = 2 Then
Call WinNTSetDefaultPrinter
End If
End Sub
Sub main()
Dim r As Long
Dim Buffer As String

'Get the list of available printers from WIN.INI
Buffer = Space(81

2)
r = GetProfileString("PrinterPorts", vbNullString, "", _
Buffer, Len(Buffer))

'The code indicated by the brackets is used if you
'have a listbox on screen, this example uses some
'hardcoding. uses gstrprinter instead of List1
'{
''Display the list of printer in the list box List1
''ParseList List1, Buffer
'}
'Printer Name
gstrprinter = InputBox("My Printer is called:", "My Printer")
SetPrinters
End Sub