Update README and help messages for commands

Update text for the multiple HID backends.

README.md

@@ -11,9 +11,13 @@ Documentation for HID++ 1.0 mice, can be found on [my G500 repository](https://g
 Building
 --------
 
-The library has no dependency except for C++14 standard library and Linux hidraw API.
+Building requires a C++14 compiler and cmake.
 
-`hidpp-list-devices` depends on **libudev**. Profile tools use **TinyXML2** for parsing and writing profiles.
+The library can be built with different HID backend (using the `HID_BACKEND` cmake variable, default is set according the current operating system).
+ - `linux` uses Linux hidraw and **libudev**.
+ - `windows` uses Microsoft Windows HID API.
+
+Profile tools use **TinyXML2** for parsing and writing profiles.
 
 Use cmake to build the library and tools.
 
@@ -34,11 +38,11 @@ Library and tools can be installed with `make install`.
 Commands
 --------
 
-Most commands use a hidraw device node for interacting with the device. For some wireless devices, you need to add a *device index* with the `-d` or `--device` in order to access the device instead of the receiver. Use `hidpp-list-devices` to discover plugged devices and their respective hidraw node and device index.
+Most commands use a device path for interacting with the device. For some devices (wireless or older HID++ 1.0 devices), you need to add a *device index* with the `-d` or `--device` in order to access the device instead of the receiver. Use `hidpp-list-devices` to discover plugged devices and their respective device path and index.
 
 ### Check HID++ protocol
 
-    hidpp-check-device /dev/hidrawX
+    hidpp-check-device *device_path*
 
 This command print the protocol version of the device if it supports HID++. Otherwise it return a non-zero code.
 
@@ -52,18 +56,18 @@ List every HID++ devices that can be opened (run as root if the device is not vi
 
 ### Discover HID++ features or registers
 
-    hidpp-list-features /dev/hidrawX
+    hidpp-list-features *device_path*
 
 List every feature or register available on the device. For HID++ 1.0, register are discovered by trying to read or write them, this command does not try writing unless the `-w` or `--write` options are given.
 
 
 ### Dump and write HID++ 1.0 device memory
 
-    hidpp10-dump-page /dev/hidrawX page
+    hidpp10-dump-page *device_path* *page*
 
 Dump the content of page *page* in the HID++ 1.0 device memory in stdout.
 
-    hidpp10-write-page /dev/hidrawX page
+    hidpp10-write-page *device_path* *page*
 
 Write the content of stdin in page *page* of the HID++ 1.0 device.
 
@@ -72,11 +76,11 @@ Write the content of stdin in page *page* of the HID++ 1.0 device.
 
 Profiles are stored in XML format, see *profile_format.md* for details.
 
-    hidpp-persistent-profiles /dev/hidrawX read [file]
+    hidpp-persistent-profiles *device_path* read [*file*]
 
 Read the persistent profiles from the device and write them in XML format in *file* or stdout.
 
-    hidpp-persistent-profiles /dev/hidrawX write [file]
+    hidpp-persistent-profiles *device_path* write [*file*]
 
 Write the persistent profiles from the XML in *file* or stdin to the device.
 
@@ -89,23 +93,23 @@ Supported devices:
 
 ### HID++ 1.0 profile management
 
-    hidpp10-load-temp-profile /dev/hidrawX [file]
+    hidpp10-load-temp-profile *device_path* [*file*]
 
 Write the profile from the XML in *file* or stdin to the device temporary memory and load it.
 
-    hidpp10-active-profile /dev/hidrawX current
+    hidpp10-active-profile *device_path* current
 
 Get the index of the current profile (or `default` if the factory default is loaded).
 
-    hidpp10-active-profile /dev/hidrawX load index
+    hidpp10-active-profile *device_path* load *index*
 
 Load the profile *index* from persistent memory.
 
-    hidpp10-active-profile /dev/hidrawX load-default
+    hidpp10-active-profile *device_path* load-default
 
 Load the factory default profile.
 
-    hidpp10-active-profile /dev/hidrawX load-address page [offset]
+    hidpp10-active-profile *device_path* load-address *page* [*offset*]
 
 Load the profile at the given address (default value for *offset* is 0).
 
@@ -116,15 +120,15 @@ Reload the current profile from persistent memory (useful to get back to the las
 
 ### Changing mouse resolution
 
-    hidpp-mouse-resolution /dev/hidrawX get
+    hidpp-mouse-resolution *device_path* get
 
 Get the current resolution from the mouse.
 
-    hidpp-mouse-resolution /dev/hidrawX set x_dpi [y_dpi]
+    hidpp-mouse-resolution *device_path* set *x_dpi* [*y_dpi*]
 
 Set the current resolution for the mouse. If only one resolution is given, both axes use *x_dpi*. Some mice do not support per-axis resolution.
 
-    hidpp-mouse-resolution /dev/hidrawX info
+    hidpp-mouse-resolution *device_path* info
 
 Print informations about supported resolutions.
 
@@ -133,14 +137,14 @@ Supported devices: G5, G9, G9x, G500, G500x, G700, G700s, HID++2.0 or later devi
 
 ### Advanced HID++ 1.0 commands
 
-    hidpp10-raw-command /dev/hidrawX command read|write short|long [parameters...]
+    hidpp10-raw-command *device_path* *command* read|write short|long [*parameters*...]
 
 Used for raw interaction with HID++ 1.0 register *command*. Parameters are hexadecimal and default are zeroes.
 
 
 ### Advanced HID++ 2.0 or later commands
 
-    hidpp20-call-function /dev/hidrawX feature_index function [parameters...]
+    hidpp20-call-function *device_path* *feature_index* *function* [*parameters*...]
 
 Call the low-level function given by `feature_index` and `function`. Parameters are hexadecimal and default are zeroes.
 

src/tools/hidpp-check-device.cpp

@@ -29,7 +29,7 @@
 
 int main (int argc, char *argv[])
 {
-	static const char *args = "/dev/hidrawX";
+	static const char *args = "device_path";
 	HIDPP::DeviceIndex device_index = HIDPP::DefaultDevice;
 
 	std::vector<Option> options = {

src/tools/hidpp-list-features.cpp

@@ -145,7 +145,7 @@ void testRegister (HIDPP10::Device *dev, std::size_t register_size, uint8_t addr
 
 int main (int argc, char *argv[])
 {
-	static const char *args = "/dev/hidrawX";
+	static const char *args = "device_path";
 	HIDPP::DeviceIndex device_index = HIDPP::DefaultDevice;
 	bool do_write_tests = false;
 

src/tools/hidpp-mouse-resolution.cpp

@@ -183,7 +183,7 @@ class Operations20: public Operations
 
 int main (int argc, char *argv[])
 {
-	static const char *args = "/dev/hidrawX get|set dpi [y_dpi]";
+	static const char *args = "device_path get|set dpi [y_dpi]";
 	HIDPP::DeviceIndex device_index = HIDPP::DefaultDevice;
 	int sensor = 0;
 

src/tools/hidpp-persistent-profiles.cpp

@@ -49,7 +49,7 @@ using namespace tinyxml2;
 
 int main (int argc, char *argv[])
 {
-	static const char *args = "/dev/hidrawX read|write [file]";
+	static const char *args = "device_path read|write [file]";
 	HIDPP::DeviceIndex device_index = HIDPP::DefaultDevice;
 
 	std::vector<Option> options = {

src/tools/hidpp10-active-profile.cpp

@@ -34,7 +34,7 @@ extern "C" {
 
 int main (int argc, char *argv[])
 {
-	static const char *args = "/dev/hidrawX current|load|load-default|load-address|reload";
+	static const char *args = "device_path current|load|load-default|load-address|reload";
 	HIDPP::DeviceIndex device_index = HIDPP::DefaultDevice;
 
 	std::vector<Option> options = {

src/tools/hidpp10-dump-page.cpp

@@ -33,7 +33,7 @@ extern "C" {
 
 int main (int argc, char *argv[])
 {
-	static const char *args = "/dev/hidrawX page";
+	static const char *args = "device_path page";
 	HIDPP::DeviceIndex device_index = HIDPP::DefaultDevice;
 
 	std::vector<Option> options = {

src/tools/hidpp10-load-temp-profile.cpp

@@ -49,7 +49,7 @@ using HIDPP::Macro;
 
 int main (int argc, char *argv[])
 {
-	static const char *args = "/dev/hidrawX [file]";
+	static const char *args = "device_path [file]";
 	HIDPP::DeviceIndex device_index = HIDPP::DefaultDevice;
 
 	std::vector<Option> options = {

src/tools/hidpp10-raw-command.cpp

@@ -28,7 +28,7 @@
 
 int main (int argc, char *argv[])
 {
-	static const char *args = "/dev/hidrawX command read|write short|long [parameters...]";
+	static const char *args = "device_path command read|write short|long [parameters...]";
 	HIDPP::DeviceIndex device_index = HIDPP::DefaultDevice;
 
 	std::vector<Option> options = {

src/tools/hidpp10-write-page.cpp

@@ -33,7 +33,7 @@ extern "C" {
 
 int main (int argc, char *argv[])
 {
-	static const char *args = "/dev/hidrawX";
+	static const char *args = "device_path page";
 	HIDPP::DeviceIndex device_index = HIDPP::DefaultDevice;
 
 	std::vector<Option> options = {

src/tools/hidpp20-call-function.cpp

@@ -28,7 +28,7 @@
 
 int main (int argc, char *argv[])
 {
-	static const char *args = "/dev/hidrawX feature_index function [parameters...]";
+	static const char *args = "device_path feature_index function [parameters...]";
 	HIDPP::DeviceIndex device_index = HIDPP::DefaultDevice;
 
 	std::vector<Option> options = {

src/tools/hidpp20-dump-page.cpp

@@ -34,7 +34,7 @@ extern "C" {
 
 int main (int argc, char *argv[])
 {
-	static const char *args = "/dev/hidrawX page";
+	static const char *args = "device_path page";
 	auto mem_type = HIDPP20::IOnboardProfiles::MemoryType::Writeable;
 	HIDPP::DeviceIndex device_index = HIDPP::DefaultDevice;
 

src/tools/hidpp20-onboard-profiles-get-description.cpp

@@ -31,7 +31,7 @@
 
 int main (int argc, char *argv[])
 {
-	static const char *args = "/dev/hidrawX";
+	static const char *args = "device_path";
 	HIDPP::DeviceIndex device_index = HIDPP::DefaultDevice;
 
 	std::vector<Option> options = {

src/tools/hidpp20-reprog-controls.cpp

@@ -67,7 +67,7 @@ bool setFlag (Flag *flag, const char *optarg)
 
 int main (int argc, char *argv[])
 {
-	static const char *args = "/dev/hidrawX info|get|set [control_id] [remap_id]";
+	static const char *args = "device_path info|get|set [control_id] [remap_id]";
 	HIDPP::DeviceIndex device_index = HIDPP::DefaultDevice;
 
 	Flag divert = NoChange, persist = NoChange, raw_xy = NoChange;

src/tools/hidpp20-write-data.cpp

@@ -36,7 +36,7 @@ extern "C" {
 
 int main (int argc, char *argv[])
 {
-	static const char *args = "/dev/hidrawX page offset";
+	static const char *args = "device_path page offset";
 	HIDPP::DeviceIndex device_index = HIDPP::DefaultDevice;
 
 	std::vector<Option> options = {

src/tools/hidpp20-write-page.cpp

@@ -36,7 +36,7 @@ extern "C" {
 
 int main (int argc, char *argv[])
 {
-	static const char *args = "/dev/hidrawX page";
+	static const char *args = "device_path page";
 	HIDPP::DeviceIndex device_index = HIDPP::DefaultDevice;
 	bool add_crc = false;