Question

我重新创建了一些OpenNetCF组件，例如PowerManagement和DeviceStatusMonitor。但由于他们从未提出任何事件，我怀疑有些事情是错的。我的第一个想法是检查他们都依赖的P2PMessageQueue。然后是BAM，CreateMsgQueue返回 IntPtr.Zero 。检查最后一个Win32Error会给我一个错误代码值-2147467259（减号）。

这只是另一个不提供任何提示的通用错误代码吗？

任何帮助都将不胜感激。

（仅供参考：WinCE 5.0，CF 2.0）

Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Try

            Dim lpName As String = "MyQueue"
            Dim lpOptions As MSGQUEUEOPTIONS = New MSGQUEUEOPTIONS()
            Dim hMsgQ As IntPtr = IntPtr.Zero

            lpOptions.bReadAccess = True
            lpOptions.dwMaxMessages = 0
            lpOptions.cbMaxMessage = &H1000
            lpOptions.dwFlags = MSGQUEUE_ALLOW_BROKEN
            lpOptions.dwSize = Marshal.SizeOf(lpOptions)

            hMsgQ = CreateMsgQueue(lpName, lpOptions)

            If (hMsgQ = IntPtr.Zero) Then
                Throw New Win32Exception(Marshal.GetLastWin32Error())
            Else
                CloseMsgQueue(hMsgQ)
            End If

        Catch ex As Win32Exception
            MessageBox.Show(String.Format(String.Format("Win32Exception: {0}", ex.ErrorCode)))
        Catch ex As Exception
            MessageBox.Show(ex.Message)
        End Try
    End Sub

    <DllImport("coredll.dll", CharSet:=CharSet.Auto, SetLastError:=True)> _
    Private Shared Function CloseMsgQueue(ByVal hMsgQ As IntPtr) As Boolean
    End Function

    <DllImport("coredll.dll", CharSet:=CharSet.Auto, SetLastError:=True)> _
    Private Shared Function CreateMsgQueue(<MarshalAs(UnmanagedType.LPWStr)> ByVal lpName As String, ByVal lpOptions As MSGQUEUEOPTIONS) As IntPtr
    End Function

    <StructLayout(LayoutKind.Sequential)> _
    Private Structure MSGQUEUEOPTIONS
        Public dwSize As Integer
        Public dwFlags As Integer
        Public dwMaxMessages As Integer
        Public cbMaxMessage As Integer
        Public bReadAccess As Boolean
    End Structure

    Private Const MSGQUEUE_ALLOW_BROKEN As Integer = 2
    Private Const MSGQUEUE_NOPRECOMMIT As Integer = 1
    Private Const MSGQUEUE_MSGALERT As Integer = 1

End Class

Answer 1

lpOptions参数声明不正确。您将其声明为ByVal，但它应为ByRef。

那就是说，-2147467259有点奇怪。这不是Win32错误代码。这是一个COM HRESULT。具体来说就是0x80004005。哪个是Win32 ERROR_ACCESS_DENIED周围的COM包装器。不知道你在这段代码中从哪里得到COM HRESULT，但是看起来你没有足够的权利来处理你正在尝试的东西。

CreateMsgQueue失败，Win32Error为-2147467259

1 个答案: