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Win32.SendMessageTimeout(windowHandle, lMsg, IntPtr.Zero, IntPtr.Zero, SendMessageTimeoutFlags.SMTO_ABORT_IF_HUNG, 1000, out lRes);

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Summary

The SendMessageTimeout API

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public static extern IntPtr SendMessageTimeout(

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    SendMessageTimeoutFlags fuFlags,

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public static extern IntPtr SendMessageTimeout(

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    SendMessageTimeoutFlags flags,

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[DllImport("user32.dll", EntryPoint = "SendMessageTimeout", SetLastError=true, CharSet=CharSet.Auto)]

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public static extern uint SendMessageTimeoutText(

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    SendMessageTimeoutFlags flags,

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[DllImport("user32.dll", EntryPoint = "SendMessageTimeout", CharSet = CharSet.Auto)]

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public static extern int SendMessageTimeout(

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SendMessageTimeoutFlags

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Public Sub SendMessageTimeout(ByVal windowHandle As IntPtr,ByVal Msg As Integer,ByVal wParam As IntPtr,ByVal lParam As IntPtr,ByVal flags As SendMessageTimeoutFlags,ByVal timeout As Integer,ByRef result As IntPtr)

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Public Shared Function SendMessageTimeout(ByVal windowHandle As IntPtr, ByVal Msg As Integer, ByVal wParam As IntPtr, ByVal lParam As IntPtr, ByVal flags As SendMessageTimeoutFlags, ByVal timeout As Integer, ByRef result As IntPtr) As IntPtr

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Win32.SendMessageTimeout(windowHandle, lMsg, IntPtr.Zero, IntPtr.Zero, SendMessageTimeoutFlags.SMTO_ABORT_IF_HUNG, 1000, out lRes);

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    int result = SendMessageTimeout(hwnd, WM_GETTEXTLENGTH, 0, 0, 0X2C, 5, out length); //0X2C = SMTO_ABORTIFHUNG | SMTO_BLOCK | SMTO_NOTIMEOUTIFNOTHUNG | SMTO_ERRORONEXIT

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Documentation

[SendMessageTimeout] on MSDN

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Summary

The SendMessageTimeout API

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public static extern IntPtr SendMessageTimeout(

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    SendMessageTimeoutFlags fuFlags,

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public static extern IntPtr SendMessageTimeout(

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    SendMessageTimeoutFlags flags,

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[DllImport("user32.dll", EntryPoint = "SendMessageTimeout", SetLastError=true, CharSet=CharSet.Auto)]

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public static extern uint SendMessageTimeoutText(

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    SendMessageTimeoutFlags flags,

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SendMessageTimeoutFlags

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Public Sub SendMessageTimeout(ByVal windowHandle As IntPtr,ByVal Msg As Integer,ByVal wParam As IntPtr,ByVal lParam As IntPtr,ByVal flags As SendMessageTimeoutFlags,ByVal timeout As Integer,ByRef result As IntPtr)

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Public Shared Function SendMessageTimeout(ByVal windowHandle As IntPtr, ByVal Msg As Integer, ByVal wParam As IntPtr, ByVal lParam As IntPtr, ByVal flags As SendMessageTimeoutFlags, ByVal timeout As Integer, ByRef result As IntPtr) As IntPtr

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Win32.SendMessageTimeout(windowHandle, lMsg, IntPtr.Zero, IntPtr.Zero, SendMessageTimeoutFlags.SMTO_ABORT_IF_HUNG, 1000, out lRes);

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Documentation

[SendMessageTimeout] on MSDN

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Optionally call SendMessageTimeout() to notify running programs of the change:

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    pinvokeResult = SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE, IntPtr.Zero,

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        IntPtr.Zero, SendMessageTimeoutFlags.SMTO_NORMAL, 1000, out innerPinvokeResult);

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        pinvokeResult = SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE, IntPtr.Zero,

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            IntPtr.Zero, SendMessageTimeoutFlags.SMTO_NORMAL, 1000, out innerPinvokeResult);

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if ( SendMessageTimeout(hWnd, nMsg, UIntPtr.Zero, IntPtr.Zero,

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     SendMessageTimeoutFlags.SMTO_ABORTIFHUNG, 1000, out lRes) == IntPtr.Zero )

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Summary

SendMessageTimeout fuFlags

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enum SendMessageTimeoutFlags : uint

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Public Enum SendMessageTimeoutFlags

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Documentation

[SendMessageTimeout] on MSDN

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    ''' use the <see cref="NativeMethods.SendMessageTimeout"/> function with the <paramref name="hwnd"/> parameter set to

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There is a message (WM_SETTINGCHANGE) you can send in order to notify the active windows that there has been a configuration change using the SendMessageTimeout function.