random lost key input on hooks - c++

Question

i have an HID usb rfid reader that act like a keyboard,
i don't want to put a textbox on my form (WPF) to recieve the text from it because i have other requirements .
instead i am trying to capture the key pressed events and process them . for that i have tried three differents methods :
Windows Hook (c++)
this is the most simple testcase example that illustrate the issue
#include <iostream>
#include <fstream>
#include <Windows.h>
#pragma comment(lib, "user32.lib")
HHOOK keyboardHook{ NULL };
DWORD lastkey = 0;
LRESULT CALLBACK MyLowLevelKeyBoardProc(const int nCode, const WPARAM wParam, const LPARAM lParam)
{
KBDLLHOOKSTRUCT *kb = (KBDLLHOOKSTRUCT *)lParam;
switch (wParam)
{
case WM_KEYUP:
if (lastkey == 13)
system("cls");
std::cout << "KeyUp event : " << kb->vkCode << std::endl;
lastkey = kb->vkCode;
break;
}
return CallNextHookEx(keyboardHook, nCode, wParam, lParam);
}
int main(int argc, char* argv[])
{
keyboardHook = SetWindowsHookEx(WH_KEYBOARD_LL, MyLowLevelKeyBoardProc, NULL, 0);
if (keyboardHook == NULL) {
std::cout << "Keyboard hook failed!" << std::endl;
}
while (GetMessage(NULL, NULL, 0, 0));
return 0;
}
Raw input API
by handling the WM_INPUT message (too many code to show)
oblita interception library
the most interesting solution that i will use if i fix the problem
#include "stdafx.h"
#include "C:\Dev\WPF\Interception\library\interception.h"
#include "C:\Dev\WPF\Interception\Interception-1.0.0\samples\utils.h"
#include <string>
#include <iostream>
enum ScanCode
{
SCANCODE_X = 0x2D,
SCANCODE_Y = 0x15,
SCANCODE_ESC = 0x01
};
int main()
{
using namespace std;
InterceptionContext context;
InterceptionDevice device;
InterceptionStroke stroke;
wchar_t hardware_id[500];
string buffer = "";
//raise_process_priority();
context = interception_create_context();
interception_set_filter(context, interception_is_keyboard, INTERCEPTION_FILTER_KEY_UP | INTERCEPTION_FILTER_KEY_UP);
while (interception_receive(context, device = interception_wait(context), &stroke, 1) > 0)
{
if (interception_is_keyboard(device))
{
InterceptionKeyStroke &keystroke = *(InterceptionKeyStroke *)&stroke;
if (keystroke.code == SCANCODE_ESC) break;
size_t length = interception_get_hardware_id(context, device, hardware_id, sizeof(hardware_id));
if (wcsstr(hardware_id, L"04F3&PID_0009") == 0)
interception_send(context, device, &stroke, 1); // Real Keyboard
else
{
// RFID reader
if (keystroke.code == 28)
{
std::cout << buffer << endl;
buffer = "";
}
else
buffer = buffer + std::to_string(keystroke.code);
}
}
}
interception_destroy_context(context);
return 0;
}
all the three methods gave me the same problem :
some keys are randomly lost during the read, instead of having the 10 characters i my have 8/9 only .
if i use the rfid reader on blocnote no character is lost so there is no problem with the reader .
so my question is : how to ensure that no message/key is lost by windows on the hooks , even if the read operation may take 10 seconds .
thanks and good day .