keybdhook.cpp

主要介绍vc++6.0的编程过程

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

#include "stdafx.h"
#include "KeybdHook.h"

#pragma data_seg(".SHARDAT")
static HWND      ghWndMain  = 0;
static HHOOK     ghKeyHook = NULL ;
#pragma data_seg()

HINSTANCE ghInstance = 0;
HOOKPROC  glpfnHookProc = 0;

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

//
//	Note!
//
//		If this DLL is dynamically linked against the MFC
//		DLLs, any functions exported from this DLL which
//		call into MFC must have the AFX_MANAGE_STATE macro
//		added at the very beginning of the function.
//
//		For example:
//
//		extern "C" BOOL PASCAL EXPORT ExportedFunction()
//		{
//			AFX_MANAGE_STATE(AfxGetStaticModuleState());
//			// normal function body here
//		}
//
//		It is very important that this macro appear in each
//		function, prior to any calls into MFC.  This means that
//		it must appear as the first statement within the 
//		function, even before any object variable declarations
//		as their constructors may generate calls into the MFC
//		DLL.
//
//		Please see MFC Technical Notes 33 and 58 for additional
//		details.
//

/////////////////////////////////////////////////////////////////////////////
// CKeybdHookApp

BEGIN_MESSAGE_MAP(CKeybdHookApp, CWinApp)
	//{{AFX_MSG_MAP(CKeybdHookApp)
		// NOTE - the ClassWizard will add and remove mapping macros here.
		//    DO NOT EDIT what you see in these blocks of generated code!
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CKeybdHookApp construction

CKeybdHookApp::CKeybdHookApp()
{
	// TODO: add construction code here,
	// Place all significant initialization in InitInstance
}

/////////////////////////////////////////////////////////////////////////////
// The one and only CKeybdHookApp object

CKeybdHookApp theApp;

LRESULT EXPORTED_DLL_FUNCTION KbdHookProc 
(int nCode, WPARAM  wParam, LPARAM lParam)
{
 BOOL bHandledKeystroke = FALSE;

 if (((DWORD)lParam & 0x40000000)
 && (HC_ACTION == nCode))
 { 
  switch (wParam)
  {
   case VK_F10:
    AfxMessageBox("Caught the F10 key!");
    bHandledKeystroke = TRUE;
   break;

   default :
   break ;
  }
 }

 return (bHandledKeystroke ? 
  TRUE : 
  ::CallNextHookEx (ghKeyHook, nCode, wParam, lParam));
}

BOOL EXPORTED_DLL_FUNCTION InstallKeyboardHook 
 (HWND hWnd)
{
 BOOL bSuccess = FALSE;

 if (!ghKeyHook)
 {
  ghWndMain     = hWnd ;
  glpfnHookProc = (HOOKPROC) KbdHookProc ;

  bSuccess = (NULL != (ghKeyHook = 
   ::SetWindowsHookEx (WH_KEYBOARD, glpfnHookProc,
   ghInstance, NULL)));
 }

 return bSuccess;
}

BOOL EXPORTED_DLL_FUNCTION DeInstallKeyboardHook()
{
 if (ghKeyHook)
 {
  if (TRUE == (0 != ::UnhookWindowsHookEx(ghKeyHook)))
  {
   ghKeyHook = NULL;
  }
 }

 return (NULL == ghKeyHook);
}

BOOL CKeybdHookApp::InitInstance()
{
  AFX_MANAGE_STATE(AfxGetStaticModuleState());
  ghInstance = AfxGetInstanceHandle();
  return TRUE;
}

int CKeybdHookApp::ExitInstance()
{
  DeInstallKeyboardHook();
  return CWinApp::ExitInstance();
}