获取打印机纸张信息

Option Explicit
Private Const DC_MAXEXTENT = 5
Private Const DC_MINEXTENT = 4
Private Const DC_PAPERNAMES = 16
Private Const DC_PAPERS = 2
Private Const DC_PAPERSIZE = 3
Private Declare Function DeviceCapabilities Lib "winspool.drv" Alias "DeviceCapabilitiesA" (ByVal lpDeviceName As String, ByVal lpPort As String, ByVal iIndex As Long, lpOutput As Any, lpDevMode As Any) As Long
Private Type POINTS
        x  As Long
        y  As Long
End Type

'***********************************************************
'* 名称：GetPaperInfo
'* 功能：得到打印机低张信息
'* 用法：GetPaperInfo(控件名)
'* 描述：如在 form_load()中调用GetPaperInfo MSHFlexGrid1
'***********************************************************
Public Function GetPaperInfo(Flex As MSHFlexGrid) As Boolean

    Dim i As Long, ret As Long
    Dim Length As Integer, Width As Integer
    Dim PaperNo() As Integer, PaperName() As String, PaperSize() As POINTS
    
    With Flex
        .FormatString = "^纸张编号|^纸张名称|^纸张长度|^纸张宽度"
        For i = 0 To .Cols - 1
            .ColWidth(i) = 1700
        Next i
        .AllowUserResizing = flexResizeColumns
        .Left = 0
    End With
        
    '支持最大打印纸：
    ret = DeviceCapabilities(Printer.DeviceName, "LPT1", DC_MAXEXTENT, ByVal 0&, ByVal 0&)
    Length = ret  65536
    Width = ret - Length * 65536
    
    '支持最小打印纸：
    ret = DeviceCapabilities(Printer.DeviceName, "LPT1", DC_MINEXTENT, ByVal 0&, ByVal 0&)
    Length = ret  65536
    Width = ret - Length * 65536
    
    '支持纸张种类数
    ret = DeviceCapabilities(Printer.DeviceName, "LPT1", DC_PAPERS, ByVal 0&, ByVal 0&)
    
    '纸张编号
    ReDim PaperNo(1 To ret) As Integer
    Call DeviceCapabilities(Printer.DeviceName, "LPT1", DC_PAPERS, PaperNo(1), ByVal 0&)
    
    '纸张名称
    Dim arrPageName() As Byte
    Dim allNames As String
    Dim lStart As Long, lEnd As Long
    ReDim PaperName(1 To ret) As String
    ReDim arrPageName(1 To ret * 64) As Byte
    Call DeviceCapabilities(Printer.DeviceName, "LPT1", DC_PAPERNAMES, arrPageName(1), ByVal 0&)
    allNames = StrConv(arrPageName, vbUnicode)
    'loop through the string and search for the names of the papers
    i = 1
    Do
        lEnd = InStr(lStart + 1, allNames, Chr$(0), vbBinaryCompare)
        If (lEnd > 0) And (lEnd - lStart - 1 > 0) Then
            PaperName(i) = Mid$(allNames, lStart + 1, lEnd - lStart - 1)
            i = i + 1
        End If
        lStart = lEnd
    Loop Until lEnd = 0
    
    '纸张尺寸
    
    ReDim PaperSize(1 To ret) As POINTS
    Call DeviceCapabilities(Printer.DeviceName, "LPT1", DC_PAPERSIZE, PaperSize(1), ByVal 0&)
    
    '显示在表格中
    For i = 1 To ret
        Flex.AddItem PaperNo(i) & vbTab & PaperName(i) & vbTab & PaperSize(i).y & vbTab & PaperSize(i).x
    Next i
    
End Function