copy memory problem

i have posted on this issue some time ago, but need to revisit now (new printers)

using api printdialog i have an issue, getting the returned printer devicename if it is longer than 30 characters

as far as i can see the problem is the structure passed to copy memory

vb Code:

CopyMemory DevMode, ByVal lpDevMode, Len(DevMode)
 
 Type DEVMODE_TYPE
    dmDeviceName As String * CCHDEVICENAME ' =32
    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
    dmUnusedPadding As Integer
    dmBitsPerPel As Integer
    dmPelsWidth As Long
    dmPelsHeight As Long
    dmDisplayFlags As Long
    dmDisplayFrequency As Long
End Type

i have tried changing the length of the dmdevicename but no improvement, when i call the procedure the printer name is truncated to 32 characters, but the returned name is always 30 charcters

is there any way to fix this?

here is the full code to the function

Code:

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Sub ShowPrinter(frmOwner As Form, Optional PrintFlags As Long)
    '-> Code by Donald Grover
    Dim PrintDlg As PRINTDLG_TYPE
    Dim DevMode As DEVMODE_TYPE
    Dim DevName As DEVNAMES_TYPE

    Dim lpDevMode As Long, lpDevName As Long
    Dim bReturn As Integer
    Dim objPrinter As Printer, NewPrinterName As String

    ' Use PrintDialog to get the handle to a memory
    ' block with a DevMode and DevName structures

    PrintDlg.lStructSize = Len(PrintDlg)
    PrintDlg.hWndOwner = frmOwner.hWnd

    PrintDlg.flags = PrintFlags
    On Error Resume Next
    'Set the current orientation and duplex setting
    DevMode.dmDeviceName = Printer.DeviceName
    DevMode.dmSize = Len(DevMode)
    DevMode.dmFields = DM_ORIENTATION Or DM_DUPLEX
    DevMode.dmPaperWidth = Printer.Width
    DevMode.dmOrientation = Printer.Orientation
    DevMode.dmPaperSize = Printer.PaperSize
    DevMode.dmDuplex = Printer.Duplex
    On Error GoTo 0

    'Allocate memory for the initialization hDevMode structure
    'and copy the settings gathered above into this memory
    PrintDlg.hDevMode = GlobalAlloc(GMEM_MOVEABLE Or GMEM_ZEROINIT, Len(DevMode))
    lpDevMode = GlobalLock(PrintDlg.hDevMode)
    If lpDevMode > 0 Then
        CopyMemory ByVal lpDevMode, DevMode, Len(DevMode)
        bReturn = GlobalUnlock(PrintDlg.hDevMode)
    End If

    'Set the current driver, device, and port name strings
    With DevName
        .wDriverOffset = 8
        .wDeviceOffset = .wDriverOffset + 1 + Len(Printer.DriverName)
        .wOutputOffset = .wDeviceOffset + 1 + Len(Printer.Port)
        .wDefault = 0
    End With

    With Printer
        DevName.extra = .DriverName & Chr(0) & .DeviceName & Chr(0) & .Port & Chr(0)
    End With

    'Allocate memory for the initial hDevName structure
    'and copy the settings gathered above into this memory
    PrintDlg.hDevNames = GlobalAlloc(GMEM_MOVEABLE Or GMEM_ZEROINIT, Len(DevName))
    lpDevName = GlobalLock(PrintDlg.hDevNames)
    If lpDevName > 0 Then
        CopyMemory ByVal lpDevName, DevName, Len(DevName)
        bReturn = GlobalUnlock(lpDevName)
    End If

    'Call the print dialog up and let the user make changes
    If PrintDialog(PrintDlg) <> 0 Then
        'First get the DevName structure.
        lpDevName = GlobalLock(PrintDlg.hDevNames)
        CopyMemory DevName, ByVal lpDevName, Len(DevName)
        bReturn = GlobalUnlock(lpDevName)
        GlobalFree PrintDlg.hDevNames

        'Next get the DevMode structure and set the printer
        'properties appropriately
        lpDevMode = GlobalLock(PrintDlg.hDevMode)
        CopyMemory DevMode, ByVal lpDevMode, Len(DevMode)
        bReturn = GlobalUnlock(PrintDlg.hDevMode)
        GlobalFree PrintDlg.hDevMode
        NewPrinterName = Mid(Split(DevName.extra, vbNullChar)(1), 2)
'        NewPrinterName = UCase$(Left(DevMode.dmDeviceName, InStr(DevMode.dmDeviceName, Chr$(0)) - 1))
        If Printer.DeviceName <> NewPrinterName Then
            For Each objPrinter In Printers
                If objPrinter.DeviceName = NewPrinterName Then
                    Set Printer = objPrinter
                    'set printer toolbar name at this point
                End If
            Next
        End If

        On Error Resume Next
        'Set printer object properties according to selections made
        'by user
       
        Printer.Copies = DevMode.dmCopies
        Printer.Duplex = DevMode.dmDuplex
        Printer.Orientation = DevMode.dmOrientation
        Printer.PaperSize = DevMode.dmPaperSize
        Printer.PrintQuality = DevMode.dmPrintQuality
        Printer.ColorMode = DevMode.dmColor
        Printer.PaperBin = DevMode.dmDefaultSource
        On Error GoTo 0
    End If
End Sub

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i think the original code was from allapi

There is nothing you can do. You have to use other means to get the full device name, maybe even VB's own native Printers collection can help with that?

thanks merri i did not find that reference
the point is to match the return from the api to the vb printers collection devicenames
some of the printers now install with default names up to 40 characters and if with copy 2 or other extentions even more, with only the last part being different
one of my printer names is
HP Color LaserJet 2605dn_2605dtn PCL 6
and i have copy2 for black only printing
either of these is truncated to HP Color LaserJet 2605dn_2605d, so not possible to tell which is returned from the dialog

seems i can get the name from the devname structure, i was playing with this, but was unable to get reliable result, but i think i have got it now

This MAY be helpful:
VB Print Dialog

Quote:

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This MAY be helpful:

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thank you, i do know about this dialog, have posted links to it in the past, i have wrapped some apidialogs, and could not understand why the printer dialog should not return complete results