/*************************************************************
*KeyBoardHookLib.h
**************************************************************/

#define EXPORT extern "C" __declspec (dllexport)

#pragma data_seg ( "shared" )
HHOOK hKeyboard = NULL ;
HINSTANCE hDllInstance = NULL ;
#pragma data_seg ()
#pragma comment ( linker, "/section:shared,rws" )

EXPORT BOOL WINAPI SetHook ( BOOL isInstall ) ;

/**************************************************************
*KeyBoardHookLib.cpp
**************************************************************/
#include <windows.h>
#include "KeyBoardHookLib.h"

int WINAPI DLLMain ( HINSTANCE hInstance, DWORD fdwReason, PVOID pvReserved )
{ 
	hDllInstance = hInstance ;
	return true ;
}

LRESULT CALLBACK KeyboardProc ( int nCode, WPARAM wParam, LPARAM lParam )
{
	EVENTMSG *keyMSG = ( EVENTMSG * )lParam ;
	if( ( nCode == HC_ACTION ) && ( keyMSG->message == WM_KEYDOWN ))
	{
		char KeyName[10] ;
		ZeroMemory ( KeyName, 10 ) ;

		GetKeyNameText ( lParam, KeyName, 50 ) ;
		MessageBox ( NULL, KeyName, NULL, MB_OK ) ;
	}

	return CallNextHookEx ( hKeyboard, nCode, wParam, lParam ) ;
}

EXPORT BOOL WINAPI SetHook ( BOOL isInstall ) 
{
	if ( isInstall )
	{
		hKeyboard =	SetWindowsHookEx ( WH_KEYBOARD, KeyboardProc, hDllInstance, 0 ) ;
		if ( hKeyboard != NULL )
			return true ;
	}

	else
	{
		UnhookWindowsHookEx ( hKeyboard ) ;
		hKeyboard = NULL ;
		hDllInstance = NULL ;
	}

	return false ;
}

/*************************************************************
*KeyBoardHookTest.cpp
*************************************************************/
#include <windows.h>
#include "KeyBoardHookLib.h"

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;

int WINAPI WinMain ( HINSTANCE hInstance, HINSTANCE hPrevInstance,
					PSTR szCmdLine, int iCmdShow )
{
	static TCHAR szAppName[] = TEXT ( "全局键盘钩子" ) ;
	
	WNDCLASS wndClass ;
	wndClass.style         = CS_HREDRAW | CS_VREDRAW ;
    wndClass.lpfnWndProc   = WndProc ;
    wndClass.cbClsExtra    = 0 ;
    wndClass.cbWndExtra    = 0 ;
    wndClass.hInstance     = hInstance ;
    wndClass.hIcon         = LoadIcon (NULL, IDI_APPLICATION) ;
    wndClass.hCursor       = LoadCursor (NULL, IDC_ARROW) ;
    wndClass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
    wndClass.lpszMenuName  = NULL ;
    wndClass.lpszClassName = szAppName ;
     
    if ( !RegisterClass ( &wndClass ) )
    {
		MessageBox ( NULL, TEXT ( "This program requires Windows NT!" ),
			szAppName, MB_ICONERROR ) ;

		return 0 ;
    }
    
	HWND hwnd ;
    hwnd = CreateWindow ( szAppName, TEXT ("实现全局键盘钩子"),
						WS_OVERLAPPEDWINDOW,
                        CW_USEDEFAULT, CW_USEDEFAULT,
                        CW_USEDEFAULT, CW_USEDEFAULT,
                        NULL, NULL, hInstance, NULL ) ;
     
	ShowWindow (hwnd, iCmdShow) ;
    UpdateWindow (hwnd) ;

	if ( SetHook ( true ) )			//安装键盘钩子函数
		MessageBox ( NULL, "HOOK SUCCESS!", NULL, MB_OK ) ;
	else
		MessageBox ( NULL, "HOOK FAILED!", NULL, MB_OK ) ;
	
	MSG msg ;
    while (GetMessage (&msg, NULL, 0, 0))
    {
		TranslateMessage (&msg) ;
		DispatchMessage (&msg) ;
    }

    return msg.wParam ;    
}

LRESULT CALLBACK WndProc ( HWND hwnd, UINT message,
						  WPARAM wParam, LPARAM lParam )
{
	switch ( message )
	{
	case WM_DESTROY:
		SetHook ( false ) ;  //卸载键盘钩子函数
		PostQuitMessage (0) ;
        return 0 ; 
	}

	return DefWindowProc (hwnd, message, wParam, lParam) ;
}

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