C# Signature:

[DllImport("user32.dll", SetLastError=true)]
static extern int MessageBoxTimeout(IntPtr hwnd, String text, String title, uint type, Int16 wLanguageId, Int32 milliseconds);

C# Signature2:

[DllImport("user32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.U4)]
private static extern uint MessageBoxTimeout(IntPtr hwnd,
    [MarshalAs(UnmanagedType.LPTStr)]  String text,
    [MarshalAs(UnmanagedType.LPTStr)] String title,
    [MarshalAs(UnmanagedType.U4)] uint type,
    Int16 wLanguageId,
    Int32 milliseconds);

VB.Net Signature:

<DllImport("user32.dll", EntryPoint:="MessageBoxTimeoutA", setLastError:=True, CharSet:= CharSet.Unicode)> _

Private Shared Function MessageBoxTimeOut( _

    Byval hWnd as IntPtr, _
    <MarshalAs(UnmanagedType.LPStr)> ByVal lpText as StringBuilder, _
    <MarshalAs(UnmanagedType.LPStr)> ByVal lpCaption as StringBuilder, _
    <MarshalAs(UnmanagedType.U4)> ByVal uType as UInteger, _
    <MarshalAs(UnmanagedType.U2)> ByVal wLanguage as Int16, _
    <MarshalAs(UnmanagedType.U4)> ByVal dwMilliseconds as Int32, _
    ) as <MarshalAs(UnmanagedType.U4)> UInteger

End Function

VBA Signature:

Private Declare Function MessageBoxTimeOut _
     Lib "user32.dll" Alias "MessageBoxTimeoutA" _
     ( _
     Byval prmlngWindowHandle as Long, _
     Byval prmstrMessage as String, _
     Byval prmstrCaption as string, _
     Byval prmlngType as long, _
     Byval prmwLanguage as Integer, _
     Byval prmdwMiliseconds as Long _
     ) as Integer

User-Defined Types:

use MessageBoxButtons.* enumeration for type argument, cast as integer.

Use enumeration for type aruments, cast as uint with Flags

Alternative Managed API:

Do you know one? Please contribute it!

Notes:

Returns 32000 if the messagebox timed out.

Tips & Tricks:

wLanguageID

The language for the text displayed in the message box button(s). Specifying a value of zero (0) indicates to display the button text in the default system language. If this parameter is MAKELANGID(LANG_NEUTRAL, SUBLANG_NEUTRAL), the current language associated with the calling thread is used.

To specify a language other than the current language, use the MAKELANGID macro to create this parameter. For more information,see http://msdn.microsoft.com/en-gb/library/windows/desktop/dd373908(v=vs.85).aspx

dwMilliseconds

Parameter is in milliseconds so 1000 will be 1 second etc

Messagebox wont time out if dwMilliseconds is 0

Please add some!

Sample Code:

C# Example

private static uint SetupnCallMessageBoxTimeOut(IntPtr hWnd, string itsMessage, string itsCaption, uint itsMessageBoxOptions,Int32 itsTimeOutMilliSeconds)
{
     return MessageBoxTimeout(hWnd , itsMessage, itsCaption,itsMessageBoxOptions,0,itsTimeOutMilliSeconds);
}

VB.Net Example

   private Shared Function DisplayMessageBox( _
       ByVal hWnd as IntPtr, _
       ByVal Message as string, _
       ByVal Caption as string, _
       ByVal MessageOptions as UInteger, _
       Byval TimeOutMilliSeconds as Int32 _
   ) as Uinteger

   return MessageBoxTimeOut(hWnd, New StringBuilder(Message), New StringBuilder(Caption), MessageBoxOptions,0, TimeOutMilliSeconds)

   End Function      

VBA Example

     Public Function DisplayMessageBox( _
    ByVal hWnd As Long, _
    ByVal Message As String, _
    ByVal Caption As String, _
    ByVal MessageBoxOptions As Long, _
    ByVal TimeOutMilliseconds As Long _
     ) As Integer

    DisplayMessageBox = MessageBoxTimeOut(hWnd, Message, Caption, MessageBoxOptions, 0, TimeOutMilliseconds)

     End Function

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