hid_device * HID_API_EXPORT hid_open_path(const char *path) { int i; hid_device *dev = NULL; CFIndex num_devices; dev = new_hid_device(); /* Set up the HID Manager if it hasn't been done */ if (!hid_mgr) init_hid_manager(); CFSetRef device_set = IOHIDManagerCopyDevices(hid_mgr); num_devices = CFSetGetCount(device_set); IOHIDDeviceRef *device_array = calloc(num_devices, sizeof(IOHIDDeviceRef)); CFSetGetValues(device_set, (const void **) device_array); for (i = 0; i < num_devices; i++) { char cbuf[BUF_LEN]; size_t len; IOHIDDeviceRef os_dev = device_array[i]; len = make_path(os_dev, cbuf, sizeof(cbuf)); if (!strcmp(cbuf, path)) { // Matched Paths. Open this Device. IOReturn ret = IOHIDDeviceOpen(os_dev, kIOHIDOptionsTypeNone); if (ret == kIOReturnSuccess) { char str[32]; CFIndex max_input_report_len; free(device_array); CFRelease(device_set); dev->device_handle = os_dev; /* Create the buffers for receiving data */ max_input_report_len = (CFIndex) get_max_report_length(os_dev); dev->input_report_buf = calloc(max_input_report_len, sizeof(uint8_t)); /* Create the Run Loop Mode for this device. printing the reference seems to work. */ sprintf(str, "%p", os_dev); dev->run_loop_mode = CFStringCreateWithCString(NULL, str, kCFStringEncodingASCII); /* Attach the device to a Run Loop */ IOHIDDeviceScheduleWithRunLoop(os_dev, CFRunLoopGetCurrent(), dev->run_loop_mode); IOHIDDeviceRegisterInputReportCallback( os_dev, dev->input_report_buf, max_input_report_len, &hid_report_callback, dev); pthread_mutex_init(&dev->mutex, NULL); return dev; } else { goto return_error; } } } return_error: free(device_array); CFRelease(device_set); free(dev); return NULL; }
hid_device * HID_API_EXPORT hid_open_path(const char *path) { int i; hid_device *dev = NULL; CFIndex num_devices; dev = new_hid_device(); /* Set up the HID Manager if it hasn't been done */ if (hid_init() < 0) return NULL; /* give the IOHIDManager a chance to update itself */ process_pending_events(); CFSetRef device_set = IOHIDManagerCopyDevices(hid_mgr); num_devices = CFSetGetCount(device_set); IOHIDDeviceRef *device_array = (IOHIDDeviceRef *)calloc(num_devices, sizeof(IOHIDDeviceRef)); CFSetGetValues(device_set, (const void **) device_array); for (i = 0; i < num_devices; i++) { char cbuf[BUF_LEN]; size_t len; IOHIDDeviceRef os_dev = device_array[i]; len = make_path(os_dev, cbuf, sizeof(cbuf)); if (!strcmp(cbuf, path)) { /* Matched Paths. Open this Device. */ IOReturn ret = IOHIDDeviceOpen(os_dev, kIOHIDOptionsTypeSeizeDevice); if (ret == kIOReturnSuccess) { char str[32]; free(device_array); CFRetain(os_dev); CFRelease(device_set); dev->device_handle = os_dev; /* Create the buffers for receiving data */ dev->max_input_report_len = (CFIndex) get_max_report_length(os_dev); dev->input_report_buf = (uint8_t *)calloc(dev->max_input_report_len, sizeof(uint8_t)); /* Create the Run Loop Mode for this device. printing the reference seems to work. */ sprintf(str, "HIDAPI_%p", os_dev); dev->run_loop_mode = CFStringCreateWithCString(NULL, str, kCFStringEncodingASCII); /* Attach the device to a Run Loop */ IOHIDDeviceRegisterInputReportCallback( os_dev, dev->input_report_buf, dev->max_input_report_len, &hid_report_callback, dev); IOHIDDeviceRegisterRemovalCallback(dev->device_handle, hid_device_removal_callback, dev); /* Start the read thread */ pthread_create(&dev->thread, NULL, read_thread, dev); /* Wait here for the read thread to be initialized. */ pthread_barrier_wait(&dev->barrier); return dev; } else { goto return_error; } } } return_error: free(device_array); CFRelease(device_set); free_hid_device(dev); return NULL; }