multi touch - WPF Multitouch simulation: Why TouchDevice.Id is 258? -


i follow these steps download multi-touch vista , configure simulate finger touch using multiple mice.

it works well, have 2 red dots on screen, each controlled mouse.

and write wpf application, has single window canvas, , in canvas's touchdown event handler, log finger (mouse) touching screen.

private void canvas_touchdown(object sender, toucheventargs e) {     system.diagnostics.debug.writeline(e.touchdevice.id); }

but surprise, id 258, no matter mouse use - expect starting 0 or 1, , id different between 2 fingers (mice).

i testing on win7 32bit.

i bought touch monitor , can test same code on new monitor. turns out id property useful when multiple touches (fingers/stylus) present, first touch device assigned "base id", second touch device assigned ("base id "+ 1), , on. on new touch monitor, when use ten fingers, assigned ids 428, 429, 430,..., 437.

i guess "base id" can vary on different monitors.


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