82 lines
2.5 KiB
C++
82 lines
2.5 KiB
C++
#include <windows.h>
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static HWND g_hFrameWindow = (HWND)0;
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static bool g_bHookAltTab = false;
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static bool g_bHookAltGrControl = false;
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// NB. __stdcall (or WINAPI) and extern "C":
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// . symbol is decorated as _<symbol>@bytes
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// . so use the #pragma to create an undecorated alias for our symbol
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extern "C" __declspec(dllexport) LRESULT CALLBACK LowLevelKeyboardProc(
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_In_ int nCode,
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_In_ WPARAM wParam,
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_In_ LPARAM lParam)
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{
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#ifndef _WIN64
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#pragma comment(linker, "/EXPORT:" __FUNCTION__ "=" __FUNCDNAME__)
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#endif
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if (nCode == HC_ACTION)
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{
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bool suppress = false;
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PKBDLLHOOKSTRUCT pKbdLlHookStruct = (PKBDLLHOOKSTRUCT) lParam;
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UINT newMsg = pKbdLlHookStruct->flags & LLKHF_UP ? WM_KEYUP : WM_KEYDOWN;
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LPARAM newlParam = newMsg == WM_KEYUP ? 3<<30 : 0; // b31:transition state, b30:previous key state
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//
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// NB. Alt Gr (Right-Alt): this normally send 2 WM_KEYDOWN messages for: VK_LCONTROL, then VK_RMENU
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// Keyboard scanCodes: LCONTROL=0x1D, LCONTROL_from_RMENU=0x21D
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// . For: Microsoft PS/2/Win7-64, VAIO laptop/Win7-64, Microsoft USB/Win10-64
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// NB. WM_KEYDOWN also includes a 9/10-bit? scanCode: LCONTROL=0x1D, RCONTROL=0x11D, RMENU=0x1D(not 0x21D)
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// . Can't suppress in app, since scanCode is not >= 0x200
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if (g_bHookAltGrControl && pKbdLlHookStruct->vkCode == VK_LCONTROL && pKbdLlHookStruct->scanCode >= 0x200) // GH#558
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{
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suppress = true;
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}
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// Suppress alt-tab
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if (g_bHookAltTab && pKbdLlHookStruct->vkCode == VK_TAB && (pKbdLlHookStruct->flags & LLKHF_ALTDOWN))
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{
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PostMessage(g_hFrameWindow, newMsg, VK_TAB, newlParam);
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suppress = true;
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}
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// Suppress alt-escape
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if (pKbdLlHookStruct->vkCode == VK_ESCAPE && (pKbdLlHookStruct->flags & LLKHF_ALTDOWN))
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{
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PostMessage(g_hFrameWindow, newMsg, VK_ESCAPE, newlParam);
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suppress = true;
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}
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// Suppress alt-space
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if (pKbdLlHookStruct->vkCode == VK_SPACE && (pKbdLlHookStruct->flags & LLKHF_ALTDOWN))
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{
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PostMessage(g_hFrameWindow, newMsg, VK_SPACE, newlParam);
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suppress = true;
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}
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// Suppress ctrl-escape
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if (pKbdLlHookStruct->vkCode == VK_ESCAPE)
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{
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// But don't suppress CTRL+SHIFT+ESC
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if (GetKeyState(VK_CONTROL) < 0 && GetKeyState(VK_SHIFT) >= 0)
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suppress = true;
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}
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// Suppress keys by returning 1
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if (suppress)
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return 1;
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}
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return CallNextHookEx(0/*parameter is ignored*/, nCode, wParam, lParam);
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}
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extern "C" __declspec(dllexport) void __cdecl RegisterHWND(HWND hWnd, bool bHookAltTab, bool bHookAltGrControl)
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{
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g_hFrameWindow = hWnd;
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g_bHookAltTab = bHookAltTab;
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g_bHookAltGrControl = bHookAltGrControl;
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}
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