source: trunk/testapp/keyboard/OKeyHook/OKeyHook.cpp

        // OKeyHook.cpp : Defines the entry point for the DLL application.
//

#include "stdafx.h"
#include "OKeyHook.h"




#ifdef __cplusplus
  extern "C" {
#endif

//
// exported functions
//
#define OKEYTEST_IMPORT  __declspec(dllimport)

typedef (* OKEYTEST_IMPORT TpfnLogString)(LPSTR lpstrOrigin, LPSTR lpstrText);
typedef (* OKEYTEST_IMPORT TpfnLogMessage)(LPSTR lpstrOrigin, HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam);


// 
// module global functions
//
TpfnLogString pfnLogString = NULL;
TpfnLogMessage pfnLogMessage = NULL;
HHOOK     hhookStandard;                        // standard keyboard hook
HHOOK     hhookLowLevel;                        // lowlevel keyboard hook (NT4)
HOOKPROC  hpStandard;
HOOKPROC  hpLowLevel;
HMODULE   hHOOKDLL;

#ifndef WH_KEYBOARD_LL
#define WH_KEYBOARD_LL     13
#endif


//
// prototypes
//
void OKEYHOOK_API hook_Enable(BOOL fEnable);
LRESULT CALLBACK hook_Standard(int code, WPARAM wParam, LPARAM lParam);
LRESULT CALLBACK hook_LowLevel(INT nCode, WPARAM wParam, LPARAM lParam);



BOOL APIENTRY DllMain( HANDLE hModule, 
                       DWORD  ul_reason_for_call, 
                       LPVOID lpReserved
                                         )
{
    switch (ul_reason_for_call)
        {
                case DLL_PROCESS_ATTACH:
                        hHOOKDLL = (HMODULE)hModule;
                        break;

                case DLL_THREAD_ATTACH:
                case DLL_THREAD_DETACH:
                case DLL_PROCESS_DETACH:
                        hook_Enable(FALSE);
                        break;
    }
    return TRUE;
}



//
// enable / disable hooks
//
void OKEYHOOK_API hook_Enable(BOOL fEnable)
{
        if (fEnable == TRUE)
        {
                HINSTANCE hInstExe = LoadLibrary("OKEYTEST.EXE");
                if (NULL == hInstExe)
                        return;

                pfnLogString = (TpfnLogString)GetProcAddress(hInstExe, "logString");
                if (NULL == pfnLogString)
                        return;

                pfnLogMessage = (TpfnLogMessage)GetProcAddress(hInstExe, "logMessage");
                if (NULL == pfnLogMessage)
                        return;

                hpStandard = (HOOKPROC)&hook_Standard;
                hpLowLevel = (HOOKPROC)&hook_LowLevel;
                
                // enable the hooks
                if ( (NULL == hhookStandard) && (NULL != hpStandard) )
                {
                        hhookStandard = SetWindowsHookEx(WH_KEYBOARD, hpStandard, hHOOKDLL, 0);
                        if (NULL != hhookStandard)
                                pfnLogString("OKEYHOOK", "Standard keyboard hook was installed");
                }

                if ( (hhookLowLevel == NULL) && (NULL != hpLowLevel) )
                {
                        hhookLowLevel = SetWindowsHookEx(WH_KEYBOARD_LL, hpLowLevel, hHOOKDLL, 0);
                        if (NULL != hhookLowLevel)
                                pfnLogString("OKEYHOOK", "Low-Level keyboard hook was installed");
                }
        }
        else
        {
                        if (NULL != hhookStandard)
                        {
                                if (FALSE == UnhookWindowsHookEx(hhookStandard))
                                        pfnLogString("OKEYHOOK", "Standard keyboard hook was not uninstalled");
                                else
                                {
                                        pfnLogString("OKEYHOOK", "Standard keyboard hook was uninstalled");
                                        hhookStandard = NULL;
                                }
                        }

                        if (NULL != hhookLowLevel)
                        {
                                if (FALSE == UnhookWindowsHookEx(hhookLowLevel))
                                        pfnLogString("OKEYHOOK", "Low-Level keyboard hook was not uninstalled");
                                else
                                {
                                        pfnLogString("OKEYHOOK", "Low-Level keyboard hook was uninstalled");
                                        hhookLowLevel = NULL;
                                }
                        }
        }
}


//
// standard windows keyboard hook
//

LRESULT CALLBACK hook_Standard(int nCode, WPARAM wParam, LPARAM lParam)
{
        // get the extra info
        DWORD dwExtra = GetMessageExtraInfo();

        // get the key's name
        CHAR szBufKey[40];
        GetKeyNameText(lParam, szBufKey, sizeof(szBufKey));
        
        // log the message
        CHAR szBuf[512];
        wsprintf(szBuf, 
                "nCode=%08xh, wParam=%08xh, lParam=%08xh, extra=%08xh, name=%s",
                nCode,
                wParam,
                lParam,
                dwExtra,
                szBufKey);

    pfnLogString("KeyHook", szBuf);


        // call next hook
        if (nCode >= 0)
                return CallNextHookEx(hhookStandard, nCode, wParam, lParam);
        else
                return 0;
}



typedef struct tagKBDLLHOOKSTRUCT {
    DWORD   vkCode;
    DWORD   scanCode;
    DWORD   flags;
    DWORD   time;
    DWORD   dwExtraInfo;
} KBDLLHOOKSTRUCT, *LPKBDLLHOOKSTRUCT, *PKBDLLHOOKSTRUCT;


// This is for NT only
LRESULT CALLBACK hook_LowLevel(INT nCode, WPARAM wParam, LPARAM lParam)
{
        // look into the structure
        // @@@PH
        LPKBDLLHOOKSTRUCT pkbhs = (LPKBDLLHOOKSTRUCT)lParam;
  
        // log the message
        CHAR szBuf[512];
        wsprintf(szBuf, 
                "nCode=%08xh wParam=%08xh vkCode=%04xh scancode=%04xh, flags=%04xh, extra=%08xh, time=%08xh",
                nCode,
                wParam,
                pkbhs->vkCode,
                pkbhs->scanCode,
                pkbhs->flags,
                pkbhs->dwExtraInfo,
                pkbhs->time);

    pfnLogString("LowLevel", szBuf);

        // call next hook
        if (nCode >= 0)
                return CallNextHookEx(hhookLowLevel, nCode, wParam, lParam);
        else
                return 0;
}



#ifdef __cplusplus
  }
#endif