Hello, your code looks fine to me.
On my virtualized installation of Windows XP it runs flawlessly and the call to SendMessageTimeoutW returns with (= r4 1), which is a successful result according to the Win32 API documentation [1]. The result of GetLastError is meaningless in that context, since successful Win32 API calls are allowed, but not required to set the error code of the current thread to anything specific [2].
But I am no Windows expert, since I rather try to avoid programming against interfaces whose behaviour frequently contradicts their documentation or is simply undefined ;-)
Ciao, Thomas -- [1] http://msdn.microsoft.com/en-us/library/windows/desktop/ms644952%28v=vs.85%29.aspx [2] http://msdn.microsoft.com/en-us/library/ms679360%28VS.85%29.aspx -- When C++ is your hammer, every problem looks like your thumb.
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