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KeyboardHook.cpp
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75 lines (68 loc) · 2.31 KB
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#include "pch.h"
#include "KeyboardHook.h"
#include <exception>
#include <msclr/marshal.h>
#include <msclr/marshal_cppstd.h>
#include <common/debug_control.h>
#include <common/utils/winapi_error.h>
using namespace interop;
using namespace System::Runtime::InteropServices;
using namespace System;
using namespace System::Diagnostics;
KeyboardHook::KeyboardHook(
KeyboardEventCallback ^ keyboardEventCallback,
IsActiveCallback ^ isActiveCallback,
FilterKeyboardEvent ^ filterKeyboardEvent)
{
this->keyboardEventCallback = keyboardEventCallback;
this->isActiveCallback = isActiveCallback;
this->filterKeyboardEvent = filterKeyboardEvent;
}
KeyboardHook::~KeyboardHook()
{
// Unregister low level hook procedure
UnhookWindowsHookEx(hookHandle);
}
void KeyboardHook::Start()
{
hookProc = gcnew HookProcDelegate(this, &KeyboardHook::HookProc);
Process ^ curProcess = Process::GetCurrentProcess();
ProcessModule ^ curModule = curProcess->MainModule;
#if defined(DISABLE_LOWLEVEL_HOOKS_WHEN_DEBUGGED)
const bool hookDisabled = IsDebuggerPresent();
#else
const bool hookDisabled = false;
#endif
if (!hookDisabled)
{
// register low level hook procedure
hookHandle = SetWindowsHookEx(
WH_KEYBOARD_LL,
(HOOKPROC)(void*)Marshal::GetFunctionPointerForDelegate(hookProc),
0,
0);
if (hookHandle == nullptr)
{
DWORD errorCode = GetLastError();
show_last_error_message(L"SetWindowsHookEx", errorCode, L"PowerToys - Interop");
}
}
}
LRESULT __clrcall KeyboardHook::HookProc(int nCode, WPARAM wParam, LPARAM lParam)
{
if (nCode == HC_ACTION && isActiveCallback->Invoke())
{
KeyboardEvent ^ ev = gcnew KeyboardEvent();
ev->message = wParam;
ev->key = reinterpret_cast<KBDLLHOOKSTRUCT*>(lParam)->vkCode;
ev->dwExtraInfo = reinterpret_cast<KBDLLHOOKSTRUCT*>(lParam)->dwExtraInfo;
// Ignore the keyboard hook if the FilterkeyboardEvent returns false.
if ((filterKeyboardEvent != nullptr && !filterKeyboardEvent->Invoke(ev)))
{
return CallNextHookEx(hookHandle, nCode, wParam, lParam);
}
keyboardEventCallback->Invoke(ev);
return 1;
}
return CallNextHookEx(hookHandle, nCode, wParam, lParam);
}