怎样判断打印机是否准备好?
怎样判断打印机是否准备好?
谢谢!
问题点数：20、回复次数：4Top
1 楼water_j（随心所欲）回复于 2002-04-15 22:01:00 得分 0
gz!Top
2 楼enmity（灵感之源）回复于 2002-04-15 22:41:11 得分 20
Option Explicit
Private Const CCHDEVICENAME = 32
Private Const CCHFORMNAME = 32
Private 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
dmUnusedPadding As Integer
dmBitsPerPel As Long
dmPelsWidth As Long
dmPelsHeight As Long
dmDisplayFlags As Long
dmDisplayFrequency As Long
End Type
Public Enum Printer_Status
PRINTER_STATUS_READY = &H0
PRINTER_STATUS_PAUSED = &H1
PRINTER_STATUS_ERROR = &H2
PRINTER_STATUS_PENDING_DELETION = &H4
PRINTER_STATUS_PAPER_JAM = &H8
PRINTER_STATUS_PAPER_OUT = &H10
PRINTER_STATUS_MANUAL_FEED = &H20
PRINTER_STATUS_PAPER_PROBLEM = &H40
PRINTER_STATUS_OFFLINE = &H80
PRINTER_STATUS_IO_ACTIVE = &H100
PRINTER_STATUS_BUSY = &H200
PRINTER_STATUS_PRINTING = &H400
PRINTER_STATUS_OUTPUT_BIN_FULL = &H800
PRINTER_STATUS_NOT_AVAILABLE = &H1000
PRINTER_STATUS_WAITING = &H2000
PRINTER_STATUS_PROCESSING = &H4000
PRINTER_STATUS_INITIALIZING = &H8000
PRINTER_STATUS_WARMING_UP = &H10000
PRINTER_STATUS_TONER_LOW = &H20000
PRINTER_STATUS_NO_TONER = &H40000
PRINTER_STATUS_PAGE_PUNT = &H80000
PRINTER_STATUS_USER_INTERVENTION = &H100000
PRINTER_STATUS_OUT_OF_MEMORY = &H200000
PRINTER_STATUS_DOOR_OPEN = &H400000
PRINTER_STATUS_SERVER_UNKNOWN = &H800000
PRINTER_STATUS_POWER_SAVE = &H1000000
End Enum
Private Type PRINTER_DEFAULTS
pDatatype As String
pDevMode As DEVMODE
DesiredAccess As Long
End Type
Private Declare Function OpenPrinter Lib "winspool.drv" _
Alias "OpenPrinterA" (ByVal pPrinterName As String, _
phPrinter As Long, pDefault As PRINTER_DEFAULTS) As Long
Private Declare Function ClosePrinter Lib "winspool.drv" _
(ByVal hPrinter As Long) As Long
Private Sub Command1_Click()
Dim lret As Long
Dim pDef As PRINTER_DEFAULTS
Dim mhPrinter As Long
mhPrinter = Printer.hDC
lret = OpenPrinter(Printer.DeviceName, mhPrinter, pDef)
MsgBox lret
lret = ClosePrinter(mhPrinter)
End Sub
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3 楼enmity（灵感之源）回复于 2002-04-15 22:43:32 得分 0
Private Sub Command2_Click()
Dim lret As Long
Dim SizeNeeded As Long
Dim mhPrinter As Long
Dim index As Long
Dim buffer() As Long
Dim mPRINTER_INFO_2 As PRINTER_INFO_2
ReDim Preserve buffer(0 To 1) As Long
lret = GetPrinterApi(mhPrinter, index, buffer(0), UBound(buffer), SizeNeeded)
ReDim Preserve buffer(0 To (SizeNeeded / 4) + 3) As Long
lret = GetPrinterApi(mhPrinter, index, buffer(0), UBound(buffer) * 4, SizeNeeded)
With mPRINTER_INFO_2 '\\ This variable is of type PRINTER_INFO_2
.pServerName = StringFromPointer(buffer(0), 1024)
.pPrinterName = StringFromPointer(buffer(1), 1024)
.pShareName = StringFromPointer(buffer(2), 1024)
.pPortName = StringFromPointer(buffer(3), 1024)
.pDriverName = StringFromPointer(buffer(4), 1024)
.pComment = StringFromPointer(buffer(5), 1024)
.pLocation = StringFromPointer(buffer(6), 1024)
.pDevMode = buffer(7)
.pSepFile = StringFromPointer(buffer(8), 1024)
.pPrintProcessor = StringFromPointer(buffer(9), 1024)
.pDatatype = StringFromPointer(buffer(10), 1024)
.pParameters = StringFromPointer(buffer(11), 1024)
.pSecurityDescriptor = buffer(12)
.Attributes = buffer(13)
.Priority = buffer(14)
.DefaultPriority = buffer(15)
.StartTime = buffer(16)
.UntilTime = buffer(17)
.Status = buffer(18)
.JobsCount = buffer(19)
.AveragePPM = buffer(20)
End With
End Sub
Public Function StringFromPointer(lpString As Long, lMaxLength As Long) As String
Dim sRet As String
Dim lret As Long
If lpString = 0 Then
StringFromPointer = ""
Exit Function
End If
If IsBadStringPtrByLong(lpString, lMaxLength) Then
'\\ An error has occured - do not attempt to use this pointer
StringFromPointer = ""
Exit Function
End If
'\\ Pre-initialise the return string...
sRet = Space$(lMaxLength)
CopyMemory ByVal sRet, ByVal lpString, ByVal Len(sRet)
If Err.LastDllError = 0 Then
If InStr(sRet, Chr$(0)) > 0 Then
sRet = Left$(sRet, InStr(sRet, Chr$(0)) - 1)
End If
End If
StringFromPointer = sRet
End Function
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4 楼enmity（灵感之源）回复于 2002-04-15 22:45:15 得分 0
具体例子，请参考：
http://www.planet-source-code.com/vb/scripts/ShowCode.asp?txtCodeId=30390&lngWId=1Top
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