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SetWindowsHookEx not working with  x64 OS

Last Modified: 2015-04-22
I had a C# application on VS2003, running on XP and WinServer2003 (both x86 OS).
In this application I use the hook "SetWindowsHookEx" to detect user activities and make a auto logout.

I migrated the application to VS2010 (.Net4.0) which I run on WinServer2008R2 and Win7prof, both running on x64 machines. The target platform of the application is still x86.

Unfortunately, the "SetWindowsHookEx" is not working any more :-(

What could be the reason?

Thanks for any help!!
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