Выяснить сколько доступных для печати принтеров и их марку - VB
Формулировка задачи:
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Решение задачи: «Выяснить сколько доступных для печати принтеров и их марку»
textual
Листинг программы
Option Explicit Const PRINTER_ENUM_CONNECTIONS = &H4 Const PRINTER_ENUM_LOCAL = &H2 Private Declare Function EnumPrinters Lib "winspool.drv" Alias "EnumPrintersA" _ (ByVal flags As Long, ByVal name As String, ByVal Level As Long, _ pPrinterEnum As Long, ByVal cdBuf As Long, pcbNeeded As Long, _ pcReturned As Long) As Long Private Declare Function PtrToStr Lib "kernel32" Alias "lstrcpyA" _ (ByVal RetVal As String, ByVal Ptr As Long) As Long Private Declare Function StrLen Lib "kernel32" Alias "lstrlenA" _ (ByVal Ptr As Long) As Long Public Function ListPrinters() As Variant Dim bSuccess As Boolean Dim iBufferRequired As Long Dim iBufferSize As Long Dim iBuffer() As Long Dim iEntries As Long Dim iIndex As Long Dim strPrinterName As String Dim iDummy As Long Dim iDriverBuffer() As Long Dim strPrinters() As String iBufferSize = 3072 ReDim iBuffer((iBufferSize \ 4) - 1) As Long 'EnumPrinters will return a value False if the buffer is not big enough bSuccess = EnumPrinters(PRINTER_ENUM_CONNECTIONS Or _ PRINTER_ENUM_LOCAL, vbNullString, _ 1, iBuffer(0), iBufferSize, iBufferRequired, iEntries) If Not bSuccess Then If iBufferRequired > iBufferSize Then iBufferSize = iBufferRequired Debug.Print "iBuffer too small. Trying again with "; _ iBufferSize & " bytes." ReDim iBuffer(iBufferSize \ 4) As Long End If 'Try again with new buffer bSuccess = EnumPrinters(PRINTER_ENUM_CONNECTIONS Or _ PRINTER_ENUM_LOCAL, vbNullString, _ 1, iBuffer(0), iBufferSize, iBufferRequired, iEntries) End If If Not bSuccess Then 'Enumprinters returned False MsgBox$ "Error enumerating printers." Exit Function Else 'Enumprinters returned True, use found printers to fill the array ReDim strPrinters(iEntries - 1) For iIndex = 0 To iEntries - 1 'Get the printername strPrinterName = Space$(StrLen(iBuffer(iIndex * 4 + 2))) iDummy = PtrToStr(strPrinterName, iBuffer(iIndex * 4 + 2)) strPrinters(iIndex) = strPrinterName 'Debug.Print strPrinterName Next iIndex End If ListPrinters = strPrinters MsgBox$ Join(ListPrinters, vbCrLf) End Function Private Sub UserForm_Activate() Selection.TypeText Text:=Join(ListPrinters, vbCrLf) End Sub
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