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POHow to Intercept touch input on Windows 8
 

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  1. POHow to Intercept touch input on Windows 8
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    <p>I'm writing Windows 8 desktop app and would like it to pop up when user taps the screen with (for example) 4 fingers. I've found this question:</p> <p><a href="https://stackoverflow.com/questions/14297322/how-to-detect-tapping-touch-input-globally-instead-of-mouse-clicking/14304825#14304825">How to detect tapping (touch input) globally instead of mouse clicking?</a></p> <p>the answer offers 3 solutions. The first one is not good for me since I'd like to write app that works on each Win8 tablet.</p> <p>The second one (RegisterPointerInputTarget) works excellent (my app intercepts all possible touch input, even when the start panel is active or a metro app is running), but the Windows itself begins to lack some touch capabilities (e.g. I cannot scroll the start panel with my finger anymore). I've tried to inject the touch input back, but with no luck at all:</p> <pre><code>if (message &gt;= 0x0241 &amp;&amp; message &lt;= 0x024F) { DWORD pointerID = LOWORD (wParam); POINTER_TOUCH_INFO pti; GetPointerTouchInfo (pointerID, &amp;pti); InjectTouchInput (1, &amp;pti); } </code></pre> <p>(and yes, I've called InitializeTouchInjection (10, 0x3); before) Also, I personally don't like this way since the docs say that just one window can register itself for the pointer input. So I don't want my app to occupy such a resource.</p> <p>The third solution (hooks) works good, but I cannot intercept touch from a metro app or the start panel.</p> <p>Does anyone know how to correctly intercept all the touch input on Windows 8? uiAccess=true is not a problem, since my app will be signed. Thanks.</p>
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