SetWindowsHookEx WH_KEYBOARD_LL does not respond to right shift

Question

I'm trying to use the Windows API in C ++ and SetWindowsHookEx WH_KEYBOARD_LL does not seem to receive events from the right Shift key (the Shift key on the right side of the qwerty keyboard is lower than Enter ). It works with the left Shift key . How to fix this problem?

 #include "stdafx.h" #include <cstdlib> #include <fstream> #include <iostream> #include <string> #include <windows.h> #include <string> #include <shlobj.h> #include <Shlwapi.h> #include <stdio.h> #include <aclapi.h> #include <tchar.h> #include <iostream> #include <fstream> #include <future> #include <stdlib.h> #include <random> #include <ctime> #include <time.h> #include <Lmcons.h> HHOOK kbdhook; /* Keyboard hook handle */ bool running; /* Used in main loop */ __declspec(dllexport) LRESULT CALLBACK handlekeys(int code, WPARAM wp, LPARAM lp) { static bool capslock = false; static bool shift = false; char tmp[0xFF] = {0}; std::string str; DWORD msg = 1; KBDLLHOOKSTRUCT st_hook = *((KBDLLHOOKSTRUCT*)lp); msg += (st_hook.scanCode << 16); msg += ((st_hook.flags & LLKHF_EXTENDED) << 24); GetKeyNameText(msg, tmp, 0xFF); str = std::string(tmp); if (code == HC_ACTION && (wp == WM_SYSKEYDOWN || wp == WM_KEYDOWN )) { MessageBox(NULL,str.c_str(),NULL,MB_OK); } return CallNextHookEx(kbdhook, code, wp, lp); } LRESULT CALLBACK windowprocedure(HWND hwnd, UINT msg, WPARAM wp, LPARAM lp) { switch (msg) { case WM_CLOSE: case WM_DESTROY: running = false; break; default: /* Call default message handler */ return DefWindowProc(hwnd, msg, wp, lp); } return 0; } int WINAPI WinMain(HINSTANCE thisinstance, HINSTANCE previnstance, LPSTR cmdline, int ncmdshow) { HWND hwnd; HWND fgwindow = GetForegroundWindow(); MSG msg; WNDCLASSEX windowclass; HINSTANCE modulehandle; modulehandle = GetModuleHandle(NULL); kbdhook = SetWindowsHookEx(WH_KEYBOARD_LL, (HOOKPROC)handlekeys, modulehandle, NULL); running = true; while (running) { if (!GetMessage(&msg, NULL, 0, 0)) running = false; TranslateMessage(&msg); DispatchMessage(&msg); } return 0; } 

To the right, shifts the warning line in the form. However, a left shift shows the "SHIFT" line in the warning. Someone tell me ???

PS:

If I delete the line using msg + = ((st_hook.flags and LLKHF_EXTENDED) <24); → "RIGHT SHIFT" appears, but undefined appears when you press the "Windows" key

Answer 1

The vkCode KBDLLHOOKSTRUCT field displays the left and right shift. You use the key name scancode; the right shift key is called "Shift", just like on the keyboard.

Apparently, the right shift ends with an extended set of flags, which causes GetKeyNameText to look in the wrong table. Removing the extended flag ends with the key name "right shift".

  msg += (st_hook.scanCode << 16); if (st_hook.scanCode != 0x3a) { msg += ((st_hook.flags & LLKHF_EXTENDED) << 24); } GetKeyNameText(msg, tmp, 0xFF); 

Answer 2

This solution is code specific.

 if (st_hook.vkCode != VK_RSHIFT) msg += ((st_hook.flags & LLKHF_EXTENDED) << 24);