42 lines
1.2 KiB
C++
42 lines
1.2 KiB
C++
#include <windows.h>
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// https://stackoverflow.com/questions/2490577/suppress-task-switch-keys-winkey-alt-tab-alt-esc-ctrl-esc-using-low-level-k
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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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{
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#pragma comment(linker, "/EXPORT:" __FUNCTION__ "=" __FUNCDNAME__)
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if (nCode >= 0)
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{
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bool suppress = false;
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PKBDLLHOOKSTRUCT pKbdLlHookStruct = (PKBDLLHOOKSTRUCT) lParam;
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// Suppress alt-tab.
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if (pKbdLlHookStruct->vkCode == VK_TAB && (pKbdLlHookStruct->flags & LLKHF_ALTDOWN))
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suppress = true;
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// Suppress alt-escape.
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if (pKbdLlHookStruct->vkCode == VK_ESCAPE && (pKbdLlHookStruct->flags & LLKHF_ALTDOWN))
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suppress = true;
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// Suppress ctrl-escape.
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bool ControlDown = (GetKeyState(VK_CONTROL) & 0x8000) != 0;
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if (pKbdLlHookStruct->vkCode == VK_ESCAPE && ControlDown)
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suppress = true;
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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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