by Julius (1 Submission)
Category: Windows System Services
Compatability: VB 6.0
Difficulty: Unknown Difficulty
Originally Published: Wed 21st April 2004
Date Added: Mon 8th February 2021
Rating: 
(1 Votes)
This code allow print into combo box selected printer, Also allow set windows default printer Not use commondialog control.
VBcoders
'************************
' Printer setup module
' Set/retrieves the default printer - originaly for VB6
' Works for A97/a2000
' This is minimal code.
' How to use
' To get the default printer
' debug.print GetDefaultPrinter
' To set the default printer
' debug.print SetDefaultPrinter("HP Laser JET")
' above returns true if success.
' To get a list of printers suitable for a listbox, or combo
' debug.print GetPrinters (in forms on-load event you
' would use:
' Me.Combo0.RowSource = GetPrinters
' Me.Combo0 = GetDefaultPrinter
' the first line loads up the combo box, the 2nd sets
' the combo to the default.
'
' that is all there folks!
'
' Thus, when printing a report, you can:
'
' 1) save the default printer into a string
' strCurrentPtr = GetDefaultPrinter
' 2) switch to your report printer
' SetDefaultPrinter strReportsPtr
' 3) print report
' 4) switch back to the default printer
' SetDefaultPrinter strCurrentPtr
'
Public Declare Sub Sleep Lib "kernel32" (ByVal dwMilliseconds As Long)
Private Const HWND_BROADCAST As Long = &HFFFF&
Private Const WM_WININICHANGE As Long = &H1A
' The following code allows one to read, and write to the WIN.INI files
' In win 2000 the printer settings are actually in the registry. However,
windows
' handles this correctly
'
Private 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
Private Declare Function WriteProfileString Lib "kernel32" _
Alias "WriteProfileStringA" _
(ByVal lpszSection As String, _
ByVal lpszKeyName As String, _
ByVal lpszString As String) As
Long
Private Declare Function SendMessage Lib "user32" _
Alias "SendMessageA" _
(ByVal hwnd As Long, _
ByVal wMsg As Long, _
ByVal wParam As Long, _
lparam As Any) As Long
'API to Print Document
Public Const SWP_NOACTIVATE = &H10
Public Const SWP_HIDEWINDOW = &H80
Public Declare Function ShellExecute Lib "shell32.dll" Alias
"ShellExecuteA" (ByVal hwnd As Long, ByVal lpOperation As String, ByVal
lpFile As String, ByVal lpParameters As String, ByVal lpDirectory As
String, ByVal nShowCmd As Long) As Long
'Private Sub Command1_Click()
' ShellExecute Me.hwnd, "print", "TEXTRON_INVOICE.doc", _
' vbNullString, "C:\temp", SWP_NOACTIVATE Or SWP_HIDEWINDOW
'End Sub
Private Function fstrDField(mytext As String, delim As String, groupnum As
Integer) As String
' this is a standard delimiter routine that every developer I know has.
' This routine has a million uses. This routine is great for splitting up
' data fields, or sending multiple parms to a openargs of a form
'
' Parms are
' mytext - a delimited string
' delim - our delimiter (usually a , or / or a space)
' groupnum - which of the delimited values to return
'
Dim startpos As Integer, endpos As Integer
Dim groupptr As Integer, chptr As Integer
chptr = 1
startpos = 0
For groupptr = 1 To groupnum - 1
chptr = InStr(chptr, mytext, delim)
If chptr = 0 Then
fstrDField = ""
Exit Function
Else
chptr = chptr + 1
End If
Next groupptr
startpos = chptr
endpos = InStr(startpos + 1, mytext, delim)
If endpos = 0 Then
endpos = Len(mytext) + 1
End If
fstrDField = Mid$(mytext, startpos, endpos - startpos)
End Function
Function SetDefaultPrinter(strPrinterName As String) As Boolean
Dim strDeviceLine As String
Dim strBuffer As String
Dim lngbuf As Long
' get the full device string
'
strBuffer = Space(1024)
lngbuf = GetProfileString("PrinterPorts", strPrinterName, "", strBuffer,
Len(strBuffer))
'Write out this new printer information in
' WIN.INI file for DEVICE item
If lngbuf > 0 Then
strDeviceLine = strPrinterName & "," & _
fstrDField(strBuffer, Chr(0), 1) & "," & _
fstrDField(strBuffer, Chr(0), 2)
Call WriteProfileString("windows", "Device", strDeviceLine)
SetDefaultPrinter = True
' Below is optional, and should be done. It updates the existing
windows
' so the "default" printer icon changes. If you don't do the
below..then
' you will often see more than one printer as the default! The reason
*not*
' to do the SendMessage is that many open applications will now sense
the change
' in printer. I vote to leave it in..but your case you might not want
this.
'
Call SendMessage(HWND_BROADCAST, WM_WININICHANGE, 0, ByVal "windows")
Else
SetDefaultPrinter = False
End If
End Function
Function GetDefaultPrinter() As String
Dim strDefault As String
Dim lngbuf As Long
strDefault = String(255, Chr(0))
lngbuf = GetProfileString("Windows", "Device", "", strDefault,
Len(strDefault))
If lngbuf > 0 Then
GetDefaultPrinter = fstrDField(strDefault, ",", 1)
Else
GetDefaultPrinter = ""
End If
End Function
Function GetPrinters() As String
' this routine returns a list of printers, separated by
' a ";", and thus the results are suitable for stuffing into a combo box
Dim strBuffer As String
Dim strOnePtr As String
Dim intPos As Integer
Dim lngChars As Long
strBuffer = Space(2048)
lngChars = GetProfileString("PrinterPorts", vbNullString, "", strBuffer,
Len(strBuffer))
If lngChars > 0 Then
intPos = InStr(strBuffer, Chr(0))
Do While intPos > 1
strOnePtr = Left(strBuffer, intPos - 1)
strBuffer = Mid(strBuffer, intPos + 1)
If GetPrinters <> "" Then GetPrinters = GetPrinters & ";"
GetPrinters = GetPrinters & strOnePtr
intPos = InStr(strBuffer, Chr(0))
Loop
Else
GetPrinters = ""
End If
End Function
Public Function testPrintersGet()
Debug.Print GetDefaultPrinter
Debug.Print GetPrinters
End Function
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