C# Signature:

[DllImport("user32.dll")]
static extern uint MsgWaitForMultipleObjectsEx(uint nCount, IntPtr [] pHandles,
   uint dwMilliseconds, uint dwWakeMask, uint dwFlags);

VB Signature:

    Private Declare Function MsgWaitForMultipleObjects Lib "User32.dll" ( _
                ByVal nCount As Integer, _
                ByVal pHandles() As IntPtr, _
                ByVal bWaitAll As Integer, _
                ByVal dwMilliseconds As Integer, _
                ByVal dwWakeMask As Integer) As Integer

static extern uint MsgWaitForMultipleObjects(uint nCount, IntPtr [] pHandles,
   bool bWaitAll, uint dwMilliseconds, uint dwWakeMask);

User-Defined Types:

None.

Notes:

None.

Constants to pass for dwNotifyFilter.

Tips & Tricks:

Please add some!

    QS_KEY = &H1

Sample Code:

    Private Const QS_ALLEVENTS As Integer = 1215
    Private Const WAIT_OBJECT_0 As Integer = 0
    Private Const WAIT_FAILED As Integer = -1
    QS_MOUSEMOVE = &H2

    Dim arrHandles(0) As IntPtr
    Dim bAddref As Boolean
    QS_MOUSEBUTTON = &H4

    Try
        readyEvent.SafeWaitHandle.DangerousAddRef(bAddref)
        arrHandles(0) = readyEvent.SafeWaitHandle.DangerousGetHandle()
    QS_MOUSE = (QS_MOUSEMOVE Or QS_MOUSEBUTTON)

        Select Case MsgWaitForMultipleObjects(1, arrHandles, 1, waitInterval, QS_ALLEVENTS)
        Case WAIT_OBJECT_0
            retcode = True
        Case WAIT_FAILED
            Dim errorCode As Integer = System.Runtime.InteropServices.Marshal.GetLastWin32Error
            Dim errMsg As String = New System.ComponentModel.Win32Exception(errorCode).Message
            Throw New Exception(errMsg)
        Case Else
            Return False
        End Select
    Catch ex As Exception
        Trace.TraceError("TaskInvoker.Execute - {0}", ex.Message)
        Throw
    Finally
        readyEvent.SafeWaitHandle.DangerousRelease()
    End Try
    QS_INPUT = (QS_MOUSE Or QS_KEY)

    QS_POSTMESSAGE = &H8

Alternative Managed API:

Do you know one? Please contribute it!

    QS_TIMER = &H10

    [DllImport("User32.dll", SetLastError = true)]
    private static extern int MsgWaitForMultipleObjectsEx(
        int nCount,
        [In, MarshalAs(UnmanagedType.LPArray, SizeParamIndex=0)] IntPtr[] pHandles,
        int dwMilliseconds,
        int dwWakeMask,
        int dwFlags);
    QS_PAINT = &H20

    QS_SENDMESSAGE = &H40

    QS_HOTKEY = &H80

    QS_REFRESH = (QS_HOTKEY Or QS_KEY Or QS_MOUSEBUTTON Or QS_PAINT)

    QS_ALLEVENTS = (QS_INPUT Or QS_POSTMESSAGE Or QS_TIMER Or QS_PAINT Or QS_HOTKEY)

    QS_ALLINPUT = (QS_SENDMESSAGE Or QS_PAINT Or QS_TIMER Or QS_POSTMESSAGE Or QS_MOUSEBUTTON Or QS_MOUSEMOVE Or QS_HOTKEY Or QS_KEY)

    QS_ALLPOSTMESSAGE = &H100

    QS_RAWINPUT = &H400

Tips & Tricks:

Please add some!

Sample Code:

Please add some!

Alternative Managed API:

Do you know one? Please contribute it!

Please edit this page!

Do you have...

• helpful tips or sample code to share for using this API in managed code?
• corrections to the existing content?
• variations of the signature you want to share?
• additional languages you want to include?

Select "Edit This Page" on the right hand toolbar and edit it! Or add new pages containing supporting types needed for this API (structures, delegates, and more).