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POSetWindowsHookEx global keyboard hook not catching all keypresses
 

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  1. POSetWindowsHookEx global keyboard hook not catching all keypresses
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    <p>I'm writing code that is part of an automation system. I wanted to add a keyboard hook to end the test prematurely, and I did this by using SetWindowHookEx.</p> <p>My code looks pretty much like this: <a href="http://support.microsoft.com/kb/318804" rel="nofollow noreferrer">http://support.microsoft.com/kb/318804</a></p> <p>Here's my SetWindowsHookEx call:</p> <pre><code>hHook = SetWindowsHookEx(WH_KEYBOARD_LL, KeyboardHookProcedure, GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName), 0); </code></pre> <p>Now, when I run my automation, keypresses from within the automation system (from SendKeys) trigger the keyboard hook method, but when I hit the keyboard manually it isn't triggered.</p> <p>I can share more code if that helps, but it's part of a much larger system. I'm pretty sure that either:</p> <ol> <li>My SetWindowsHookEx isn't correct, or <li>Something in the automation system is bypassing my keyboard hook (I don't really know how to tell though). </ol> <p>I've written a test application that uses the sample code from microsoft.com to determine that my approach has merit (i.e., it works), but I'm having trouble integrating it with the automation system.</p> <p>Any thoughts on how to determine where things are going wrong would be greatly appreciated.</p> <p>Edit: There are no other instances of SetWindowsHookEx in the automation harness. I'm not too clear the nuances of global keyboard hooks w.r.t. threads and the desktop. If I add a global keyboard hook, should it matter from where it was added?</p>
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    1. USJonathan Yee
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    1. COI imagine something else running on the machine is "eating" the keystroke. What else is running?
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      1. USMichael Todd
    2. COYour snippet is correct. That's all I can see.
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      1. USHans Passant
    3. COThere's an entire automation stack that's running at the time (most, if not all, written in .NET). How can I tell if my keystrokes are being eaten? Remember, when the automation is running it's calling SendKeys to type characters into the application under test, and _these_ keys are registering with the keyboard hook. If I pound the keyboard while SendKeys is running, only the characters entered via SendKeys register.
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      1. USJonathan Yee
 

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