Yes, I checked the status of the XIGrabDevice call. It was 0. I followed your suggestion on using the device's id, and it does appear to work better, at least well enough for my purposes. The only confusing thing now is that I am getting event 35 (GenericEvent) back to my application when the buttons on the remote are pressed. Do you have any pointers to documentation on how I might get the key events from these? Thanks for your help.
Eric On Mon, Apr 29, 2019 at 9:27 PM Peter Hutterer <peter.hutte...@who-t.net> wrote: > On Mon, Apr 29, 2019 at 05:42:46PM -0400, Eric Sokolowsky wrote: > > I have an application that is used as a control system for a > presentation, > > under Linux and using X11. I have a USB presentation remote that acts as > a > > very miniature keyboard (four buttons: Page Up, Page Down, and two > others) > > which can be used to advance and go back in the presentation. I would > like > > to have my presentation application to receive all of the events from > this > > remote regardless of where the mouse focus is. But I would also like to > be > > able to receive the normal mouse and keyboard events if the current > window > > focus is on the presentation application. Using XIGrabDevice() I was able > > to receive all events from the remote in the presentation application > > regardless of the current focus but I was not able to receive any events > > from the mouse or other keyboard while the grab was active. Is what I'm > > trying to do possible? > > > > Here's the code I'm using: > > > > XIEventMask masks[1]; > > unsigned char mask[(XI_LASTEVENT+7)/8]; > > memset(mask, 0, sizeof(mask)); > > XISetMask(mask, XI_KeyPress); > > masks[0].deviceid = XIAllMasterDevices; > > replace this with the device ID of the remote. > > > masks[0].mask_len = sizeof(mask); > > masks[0].mask = mask; > > Status result = XIGrabDevice(dpy, deviceid, win, CurrentTime, None, > > XIGrabModeAsync, XIGrabModeAsync, True, masks); > > > > Any help would be appreciated. Thank you. > > did you check the status? XIGrabDevice with XIAllMasterDevices should fail > because it doesn't resolve into any device (this is one of the requests > where you can't use that fake device ID). Not sure why this worked at all. > Either way, using the remote's ID should work. > > Cheers, > Peter >
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