Support for Usage Page and Usage for each device in the hid_device_info struct.

hidapi/hidapi.h

@@ -59,6 +59,10 @@ extern "C" {
 			wchar_t *manufacturer_string;
 			/** Product string */
 			wchar_t *product_string;
+			/** Usage Page for this Device/Interface */
+			unsigned short usage_page;
+			/** Usage for this Device/Interface */
+			unsigned short usage;
 
 			/** Pointer to the next device */
 			struct hid_device_info *next;

testgui/test.cpp

@@ -275,9 +275,12 @@ MainWindow::onRescan(FXObject *sender, FXSelector sel, void *ptr)
 	while (cur_dev) {
 		// Add it to the List Box.
 		FXString s;
+		FXString usage_str;
 		s.format("%04hx:%04hx -", cur_dev->vendor_id, cur_dev->product_id);
 		s += FXString(" ") + cur_dev->manufacturer_string;
 		s += FXString(" ") + cur_dev->product_string;
+		usage_str.format(" (usage: %04hx:%04hx) ", cur_dev->usage_page, cur_dev->usage);
+		s += usage_str;
 		FXListItem *li = new FXListItem(s, NULL, cur_dev);
 		device_list->appendItem(li);
 		

windows/hid.cpp

@@ -291,6 +291,10 @@ struct hid_device_info HID_API_EXPORT * HID_API_CALL hid_enumerate(unsigned shor
 			#define WSTR_LEN 512
 			const char *str;
 			struct hid_device_info *tmp;
+			HIDP_PREPARSED_DATA *pp_data = NULL;
+			HIDP_CAPS caps;
+			BOOLEAN res;
+			NTSTATUS nt_res;
 			wchar_t wstr[WSTR_LEN]; // TODO: Determine Size
 			size_t len;
 
@@ -303,6 +307,18 @@ struct hid_device_info HID_API_EXPORT * HID_API_CALL hid_enumerate(unsigned shor
 				root = tmp;
 			}
 			cur_dev = tmp;
+
+			// Get the Usage Page and Usage for this device.
+			res = HidD_GetPreparsedData(write_handle, &pp_data);
+			if (res) {
+				nt_res = HidP_GetCaps(pp_data, &caps);
+				if (nt_res == HIDP_STATUS_SUCCESS) {
+					cur_dev->usage_page = caps.UsagePage;
+					cur_dev->usage = caps.Usage;
+				}
+
+				HidD_FreePreparsedData(pp_data);
+			}
 			
 			/* Fill out the record */
 			cur_dev->next = NULL;