使用低级键盘钩子实现键盘改键

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// 说明：头文件KeyRedir.h
// 作者：代码疯子
// Blog: http://www.programlife.net/ #ifndef __KEYHOOK_H_H
#define __KEYHOOK_H_H

#ifdef MY_HOOK_API
#else
#define MY_HOOK_API _declspec(dllimport)
#endif

#ifdef __cplusplus
extern "C" {
#endif

MY_HOOK_API BOOL __stdcall InstallHook();
MY_HOOK_API BOOL __stdcall UnInstallHook();

#ifdef __cplusplus
}
#endif

#endif

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// 说明：Def文件KeyRedir.def
// 作者：代码疯子
// Blog: http://www.programlife.net/ LIBRARY	"KeyRedir"

EXPORTS
InstallHook
UnInstallHook

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// 说明：源文件KeyRedir.cpp
// 作者：代码疯子
// Blog: http://www.programlife.net/ #include <windows.h>

#pragma warning(disable:4996)

#define MY_HOOK_API _declspec(dllexport)
#include "KeyRedir.h"

HINSTANCE g_hInst = NULL;
static HHOOK g_hHook = NULL;

BYTE g_bVK[4] = {VK_LEFT, VK_DOWN, VK_RIGHT, VK_UP};

LRESULT CALLBACK LowLevelKeyboardProc(
int code,
WPARAM wParam,
LPARAM lParam)
{
if(code == HC_ACTION)
{
PKBDLLHOOKSTRUCT pStruct = (PKBDLLHOOKSTRUCT)lParam;
DWORD dwIndex = 0;
switch (pStruct->vkCode)
{
case L'A':
case L'a':
dwIndex = 0;
break;

case L'S':
case L's':
dwIndex = 1;
break;

case L'D':
case L'd':
dwIndex = 2;
break;

case L'W':
case L'w':
dwIndex = 3;
break;

default:
return CallNextHookEx(g_hHook, code, wParam, lParam);
}
if (wParam == WM_KEYDOWN)
{
keybd_event(g_bVK[dwIndex], MapVirtualKey(g_bVK[dwIndex], 0), 0, 0);
}
else if (wParam == WM_KEYUP)
{
keybd_event(g_bVK[dwIndex], MapVirtualKey(g_bVK[dwIndex], 0), KEYEVENTF_KEYUP, 0);
}
return TRUE;
}
return CallNextHookEx(g_hHook, code, wParam, lParam);
}

BOOL __stdcall InstallHook()
{
g_hHook = SetWindowsHookEx(WH_KEYBOARD_LL,
LowLevelKeyboardProc,
g_hInst,
NULL);
return g_hHook == NULL ? FALSE : TRUE;
}

BOOL __stdcall UnInstallHook()
{
return UnhookWindowsHookEx(g_hHook);
}

BOOL WINAPI DllMain(IN HINSTANCE hDllHandle,
IN DWORD nReason,
IN LPVOID Reserved)
{
g_hInst = hDllHandle;
return TRUE;
}