65 lines
2.0 KiB
C++
65 lines
2.0 KiB
C++
#include <windows.h>
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static HWND g_hFrameWindow = (HWND)0;
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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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#pragma comment(linker, "/EXPORT:" __FUNCTION__ "=" __FUNCDNAME__)
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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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// Note about PostMessage() and use of VkKeyScan():
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// . Convert the ascii code to virtual key code, so that the message pump can do TranslateMessage()
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// . NB. From MSDN for "WM_KEYDOWN" && "WM_KEYUP" : "Applications must pass wParam to TranslateMessage without altering it at all."
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// Suppress alt-tab
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if (pKbdLlHookStruct->vkCode == VK_TAB && (pKbdLlHookStruct->flags & LLKHF_ALTDOWN))
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{
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PostMessage(g_hFrameWindow, newMsg, LOBYTE(VkKeyScan(0x09)), 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, LOBYTE(VkKeyScan(0x1B)), 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, LOBYTE(VkKeyScan(0x20)), newlParam);
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suppress = true;
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}
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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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extern "C" __declspec(dllexport) void __cdecl RegisterHWND(HWND hWnd)
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{
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g_hFrameWindow = hWnd;
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}
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