// Kbdll.cpp : Defines the initialization routines for the DLL.
//

#include "stdafx.h"
#include <afxdllx.h>
#include "Kbdll.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif


static AFX_EXTENSION_MODULE KbdllDLL = { NULL, NULL };

#define DLLEXPORT _declspec (dllexport)

/*extern "C" DLLEXPORT LRESULT WINAPI KeyboardHookProc(
		int nCode,WPARAM wParam,LPARAM lParam);*/


extern "C" DLLEXPORT LRESULT WINAPI 
GetMsgHookProc(int nCode,WPARAM wParam,LPARAM lParam);

//在win32 dll中，每個進程獲得其實例的全局變量拷貝。掛鉤程序要訪問
//全局變量，而且這些變量應裝入dll的所有進程之間共享。通過指定
//#progma data_seg指令和指定在def文件中的SECTION部分中的共享段可以
//作到著一點
#pragma data_seg(".sdata")
//	HHOOK glhHook=NULL;//hook handle
	HHOOK glhHook2=NULL;//hook handle
	HINSTANCE glhInstance=NULL;//instance of dll
	BOOL changed=FALSE;
#pragma data_seg()	


extern "C" int APIENTRY
DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID lpReserved)
{
	// Remove this if you use lpReserved
	UNREFERENCED_PARAMETER(lpReserved);

	if (dwReason == DLL_PROCESS_ATTACH)
	{
		TRACE0("KBDLL.DLL Initializing!\n");
		
		// Extension DLL one-time initialization
		if (!KbdllDLL.bInitialized)
		{
			AfxInitExtensionModule(KbdllDLL, hInstance);
//		if (!AfxInitExtensionModule(KbdllDLL, hInstance))
//			return 0;

		// Insert this DLL into the resource chain
		// NOTE: If this Extension DLL is being implicitly linked to by
		//  an MFC Regular DLL (such as an ActiveX Control)
		//  instead of an MFC application, then you will want to
		//  remove this line from DllMain and put it in a separate
		//  function exported from this Extension DLL.  The Regular DLL
		//  that uses this Extension DLL should then explicitly call that
		//  function to initialize this Extension DLL.  Otherwise,
		//  the CDynLinkLibrary object will not be attached to the
		//  Regular DLL's resource chain, and serious problems will
		//  result.

			new CDynLinkLibrary(KbdllDLL);
			glhInstance=hInstance;
		}
	}
	else if (dwReason == DLL_PROCESS_DETACH)
	{
		TRACE0("KBDLL.DLL Terminating!\n");
		// Terminate the library before destructors are called
		AfxTermExtensionModule(KbdllDLL);
	}
	return 1;   // ok
}
CKbHook::CKbHook()
{

}
CKbHook::~CKbHook()
{
	Stop();//uninstall mouse hook
}

HHOOK CKbHook::Start()
{
	glhHook2=SetWindowsHookEx(WH_GETMESSAGE,GetMsgHookProc,glhInstance,0);
//	glhHook=SetWindowsHookEx(WH_KEYBOARD,KeyboardHookProc,glhInstance,0);
	return glhHook2;
}

BOOL CKbHook::Stop()
{
	BOOL bResult=FALSE;
	//uninstall mouse hook if currently active
/*	if(glhHook)
	{
		bResult=UnhookWindowsHookEx(glhHook);
		if(bResult)
		{
			//initalize variables
	        glhHook=NULL;
		}
	}*/
	if(glhHook2)
	{
		bResult=UnhookWindowsHookEx(glhHook2);
		if(bResult)
		{
			//initalize variables
	        glhHook2=NULL;
		}
	}
	return bResult;
}

/*extern "C" DLLEXPORT LRESULT WINAPI 
KeyboardHookProc(int nCode,WPARAM wParam,LPARAM lParam)
{
	BOOL bNextProc=FALSE;
	LRESULT lResult=0;
	HWND hWndTarget=NULL;
	if(!hWndTarget)
		hWndTarget=::GetActiveWindow();

	bNextProc=TRUE;
	if(bNextProc)
		lResult=CallNextHookEx(glhHook,nCode,wParam,lParam);
	return(lResult);
}*/


extern "C" DLLEXPORT LRESULT WINAPI 
GetMsgHookProc(int nCode,WPARAM wParam,LPARAM lParam)
{
	BOOL bStopMessage=FALSE;
	MSG * msg=(MSG * ) lParam;
	if(nCode<0)
		return CallNextHookEx(glhHook2,nCode,wParam,lParam);
	else
	{
		HWND hWndTarget=::GetActiveWindow();
		switch(msg->message)
			
		{
		case WM_CHAR:
			if(((char)(msg->wParam)=='-')&&(changed==FALSE))
			{
				msg->wParam=(WPARAM)'_';
				changed=TRUE;
			}
			else 
			{
				if(((char)(msg->wParam)=='_')&&(changed==FALSE))
				{
					msg->wParam=(WPARAM)'-';
					changed=TRUE;
				}
			}
			break;
		default:
			break;
		}
	}
	changed=FALSE;
	return CallNextHookEx(glhHook2,nCode,wParam,lParam);
}