另类判断打印机是否为脱机状态的方法

直接上Code哈 ~

'取得窗体句柄
Public Declare Function GetWindow Lib "user32" (ByVal hwnd As Integer, ByVal wCmd As Integer) As Integer
Public Const GW_HWNDPREV As Short = 3
Public Const GW_HWNDNEXT As Short = 2
Public Const GW_HWNDFIRST As Short = 0
Public Const GW_OWNER As Short = 4

'取得窗体文本
Public Declare Function GetWindowText Lib "user32" Alias "GetWindowTextA" (ByVal hwnd As Integer, ByVal lpString As String, ByVal cch As Integer) As Integer

'查找运行程式列表中是否有指定标题的程式
Public Function FindRunningProgram(ByVal PrgName As String, Optional ByVal ExtString As String = "") As Integer

Dim RenHWND As Integer
Dim RetValue As Integer
Dim WinText As New VB.Compatibility.VB6.FixedLengthString(256)
Dim fgFindRunningProgram As Integer

'取得第一个Hwnd
RenHWND = GetWindow(Form7.Handle.ToInt32, GW_HWNDFIRST)

Do
  '取得标题
  RetValue = GetWindowText(RenHWND, WinText.Value, 256)
  '如果成功
  If RetValue <> 0 Then
     '判断是否是要找的程式
     If ExtString = "" Then
        If InStr(1, WinText.Value, PrgName) > 0 Then
           fgFindRunningProgram = 1
           Exit Do
        End If
     Else
        If InStr(1, WinText.Value, PrgName) > 0 AndAlso InStr(1, WinText.Value, ExtString) > 0 Then
           fgFindRunningProgram = 1
           Exit Do
        End If
     End If
  End If
  '寻找下一个
  RenHWND = GetWindow(RenHWND, GW_HWNDNEXT)
Loop Until RenHWND = 0
Return fgFindRunningProgram
End Function

Public Function IsOffline(ByVal PrinterName As String) As Integer

  If FindRunningProgram(PrinterName) > 0 Then
     If FindRunningProgram(PrinterName, "脱机使用打印机") > 0 Then
        Return 1
     Else
        Return 0
     End If
  Else
     Return -1
  End If

End Function

呵呵，是不是很流氓啊～