add proposed option to use hardware scan codes (closes #5)

Author: k5md

src/Config.h

@@ -8,6 +8,7 @@ struct Config {
     std::string configPath;
     std::string keymapPath;
     int altcmkp = 0;
+    bool hwsc = false;
     char keymap[256]; // idx is midi key code (0-127, typically), value is vk code (1-254)
 
     void use(std::string configPath, std::string keymapPath) {
@@ -18,6 +19,7 @@ struct Config {
     void save() {
         ini::IniFile storage;
         storage["Compatibility"]["altcmkp"] = altcmkp;
+        storage["Compatibility"]["hwsc"] = hwsc;
         storage.save(configPath);
 
         std::ofstream out;
@@ -30,6 +32,7 @@ struct Config {
         ini::IniFile storage;
         storage.load(configPath);
         if (storage["Compatibility"]["altcmkp"].as<std::string>() != "") altcmkp = storage["Compatibility"]["altcmkp"].as<int>();
+        if (storage["Compatibility"]["hwsc"].as<std::string>() != "") hwsc = storage["Compatibility"]["hwsc"].as<bool>();
 
         for (size_t i = 0; i < 255; i++) {
             keymap[i] = 0;
@@ -43,6 +46,7 @@ struct Config {
     auto repr() {
         std::map<std::string, std::string> entries = {
             { "altcmkp",  std::to_string(altcmkp) },
+            { "hwsc",  std::to_string(hwsc) },
         };
         return entries;
     }

src/M2KB.cpp

@@ -85,6 +85,7 @@ class Keymapper {
 
         void changeSettings() {
             config.altcmkp = question(ui, "Use alternative key release detection? (y/n)");
+            config.hwsc = question(ui, "Use hardware scan codes? (y/n)");
             config.save();
         }
 
@@ -137,11 +138,16 @@ class Keymapper {
             }
             INPUT input;
             input.type = INPUT_KEYBOARD;
-            input.ki.wScan = 0;
             input.ki.time = 0;
             input.ki.dwExtraInfo = 0;
             input.ki.wVk = config.keymap[+cmkc];
-            input.ki.dwFlags = cmkp ? 0 : KEYEVENTF_KEYUP;
+            if (config.hwsc) {
+                input.ki.wScan = MapVirtualKey(input.ki.wVk, MAPVK_VK_TO_VSC);
+                input.ki.dwFlags = cmkp ? KEYEVENTF_SCANCODE : KEYEVENTF_SCANCODE | KEYEVENTF_KEYUP;
+            } else {
+                input.ki.wScan = 0;
+                input.ki.dwFlags = cmkp ? 0 : KEYEVENTF_KEYUP;
+            }
             SendInput(1, &input, sizeof(INPUT));
         }