ButtonCallback.c

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/*
// Copyright 2014 Sensics, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
*/

/* Internal Includes */
#include <osvr/ClientKit/ContextC.h>
#include <osvr/ClientKit/InterfaceC.h>
#include <osvr/ClientKit/InterfaceCallbackC.h>

/* Library/third-party includes */
/* none */

/* Standard includes */
#include <stdio.h>

void myButtonCallback(void *userdata, const OSVR_TimeValue *timestamp,
                      const OSVR_ButtonReport *report) {
    printf("Got report: button is %s\n",
           (report->state ? "pressed" : "released"));
}

int main() {
    OSVR_ClientContext ctx =
        osvrClientInit("com.osvr.exampleclients.ButtonCallback", 0);

    OSVR_ClientInterface button1 = NULL;
    /* This is just one of the paths: specifically, the Hydra's left
     * controller's button labelled "1". More are in the docs and/or listed on
     * startup
     */
    osvrClientGetInterface(ctx, "/controller/left/1", &button1);

    osvrRegisterButtonCallback(button1, &myButtonCallback, NULL);

    /* Pretend that this is your application's mainloop. */
    int i;
    for (i = 0; i < 1000000; ++i) {
        osvrClientUpdate(ctx);
    }

    osvrClientShutdown(ctx);
    printf("Library shut down, exiting.\n");
    return 0;
}