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hidapi/include/hidapi_winapi.h

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+/*******************************************************
+ HIDAPI - Multi-Platform library for
+ communication with HID devices.
+
+ libusb/hidapi Team
+
+ Copyright 2022, All Rights Reserved.
+
+ At the discretion of the user of this library,
+ this software may be licensed under the terms of the
+ GNU General Public License v3, a BSD-Style license, or the
+ original HIDAPI license as outlined in the LICENSE.txt,
+ LICENSE-gpl3.txt, LICENSE-bsd.txt, and LICENSE-orig.txt
+ files located at the root of the source distribution.
+ These files may also be found in the public source
+ code repository located at:
+        https://github.com/libusb/hidapi .
+********************************************************/
+
+/** @file
+ * @defgroup API hidapi API
+ *
+ * Since version 0.12.0, @ref HID_API_VERSION >= HID_API_MAKE_VERSION(0, 12, 0)
+ */
+
+#ifndef HIDAPI_WINAPI_H__
+#define HIDAPI_WINAPI_H__
+
+#include <guiddef.h>
+
+#include "hidapi.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+		/** @brief Get the container ID for a HID device.
+
+			Since version 0.12.0, @ref HID_API_VERSION >= HID_API_MAKE_VERSION(0, 12, 0)
+
+			This function returns the `DEVPKEY_Device_ContainerId` property of
+			the given device. This can be used to correlate different
+			interfaces/ports on the same hardware device.
+
+			@ingroup API
+			@param dev A device handle returned from hid_open().
+			@param guid The device's container ID on return.
+
+			@returns
+				This function returns 0 on success and -1 on error.
+		*/
+		int HID_API_EXPORT_CALL hid_winapi_get_container_id(hid_device *dev, GUID *container_id);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

main.c

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+/**
+
+* Goal
+
+This program sets the function keys for the Logitech K380 bluetooth keyboard on Windows. 
+Having the F1-F12 without pressing the Fn key is nice for developers.
+
+I wanted a simple way to do the same as the Options/Options+ software WITHOUT their 
+continuously running processes.
+
+* How to build
+
+- prerequisite : install mingw
+- build setFnKeys.exe with :
+    gcc main.c -o dist/setFnKeys.exe -I hidapi/include -L hidapi/x86 -lhidapi
+- build setMediaKeys.exe with :
+    gcc main.c -D setMediaKeys -o dist/setMediaKeys.exe -I hidapi/include -L hidapi/x86 -lhidapi
+
+* Inspiration
+
+code from : https://github.com/keighrim/k810fn/blob/master/win/k810fn/k810fnCLI.cpp
+values from : https://github.com/jergusg/k380-function-keys-conf/blob/master/k380_conf.c
+
+*/
+
+#include <stdio.h> // printf
+#include <wchar.h> // wchar_t
+
+#include <hidapi.h>
+
+#define MAX_STR 255
+
+int main(int argc, char *argv[])
+{
+    int seq_len = 7;
+    const unsigned char k380_seq_fkeys_on[] = {0x10, 0xff, 0x0b, 0x1e, 0x00, 0x00, 0x00};
+    const unsigned char k380_seq_fkeys_off[] = {0x10, 0xff, 0x0b, 0x1e, 0x01, 0x00, 0x00};
+    int k380_vid = 0x46d;
+    int k380_pid = 0xb342;
+    static const int TARGET_USAGE = 1;
+    static const int TARGET_USAGE_PAGE = 65280;
+
+    int res;
+    int result = -1;
+    unsigned char buf[65];
+    wchar_t wstr[MAX_STR];
+    hid_device *handle;
+    struct hid_device_info *devs, *cur_dev;
+
+    // Initialize the hidapi library
+    res = hid_init();
+
+    devs = hid_enumerate(k380_vid, k380_pid);
+    cur_dev = devs;
+
+    while (cur_dev)
+    {
+        if (cur_dev->usage == TARGET_USAGE && cur_dev->usage_page == TARGET_USAGE_PAGE)
+        {
+            handle = hid_open_path(cur_dev->path);
+
+#ifdef setMediaKeys
+            printf("Set media keys as default");
+            res = hid_write(handle, k380_seq_fkeys_off, seq_len);
+#else
+            printf("Set function keys as default");
+            res = hid_write(handle, k380_seq_fkeys_on, seq_len);
+#endif
+
+            if (res != seq_len)
+            {
+                printf("error: %ls\n", hid_error(handle));
+            }
+
+            hid_close(handle);
+            if (res < 0)
+            {
+                result = -1;
+                break;
+            }
+            else
+            {
+                result = 0;
+                break;
+            }
+        }
+        cur_dev = cur_dev->next;
+    }
+    hid_free_enumeration(devs);
+
+    hid_exit();
+    return result;
+}