键盘Hook问题

写一个回调函数，然后用SetWindowsHook( WH_KEYBOARD, proc)设置好，也可以用SetWindowsHookEx函数，参数稍微复杂一点。

建立一个dll，其代码如下：
// keybeep.cpp : Defines the entry point for the DLL application.
//
#include <windows.h>
#include "keybeep.h"static HHOOK hkb=NULL;
HINSTANCE hMod;BOOL APIENTRY DllMain( HANDLE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
           )
{
    switch (ul_reason_for_call)
  {
    case DLL_PROCESS_ATTACH:
      hMod = (HINSTANCE)hModule;
      break;
    case DLL_THREAD_ATTACH:
    case DLL_THREAD_DETACH:
    case DLL_PROCESS_DETACH:
      break;
    }
    return TRUE;
}
/////////////////////////////////////////////////////////////////////////////
LRESULT CALLBACK MyKeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
{
  BOOL bDisableKey  = FALSE;
  switch(wParam)
  {
  // ESC
  case VK_ESCAPE:
    MessageBeep(-1);
    break;
  // F1~F12
  case VK_F1:
  case VK_F2:
  case VK_F3:
  case VK_F4:
  case VK_F5:
  case VK_F6:
  case VK_F7:
  case VK_F8:
  case VK_F9:
  case VK_F10:
  case VK_F11:
  case VK_F12:
    MessageBeep(MB_ICONHAND);
    break;
  // 0~9
  case '1':
  case '2':
  case '3':
  case '4':
  case '5':
  case '6':
  case '7':
  case '8':
  case '9':
  case '0':  case VK_NUMPAD1:
  case VK_NUMPAD2:
  case VK_NUMPAD3:
  case VK_NUMPAD4:
  case VK_NUMPAD5:
  case VK_NUMPAD6:
  case VK_NUMPAD7:
  case VK_NUMPAD8:
  case VK_NUMPAD9:
  case VK_NUMPAD0:
    MessageBeep(MB_OK);
    bDisableKey = true;
  }  if (bDisableKey)
    return 1;
  else
    return CallNextHookEx( hkb, nCode, wParam, lParam );
}KEYBEEP_API BOOL InstallHook()
{
  if (hkb == 0)
    hkb=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)MyKeyboardProc,hMod,0);
  return TRUE;}
KEYBEEP_API BOOL UnHook()
{
  if (hkb)
  {
    UnhookWindowsHookEx(hkb);
    hkb = 0;
  }
  return TRUE;
} 建立一个测试exe,代码如下：
// testhook.cpp : Defines the entry point for the application.
//// Windows Header Files:
#include <windows.h>// C RunTime Header Files
#include <stdlib.h>
#include <malloc.h>
#include <memory.h>
#include <tchar.h>#include "resource.h"
#include "keybeep.h"#define MAX_LOADSTRING 100// Global Variables:
HINSTANCE hInst;                // current instance
TCHAR szTitle[MAX_LOADSTRING];                // The title bar text
TCHAR szWindowClass[MAX_LOADSTRING];                // The title bar text// Foward declarations of functions included in this code module:
ATOM        MyRegisterClass(HINSTANCE hInstance);
BOOL        InitInstance(HINSTANCE, int);
LRESULT CALLBACK  WndProc(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK  About(HWND, UINT, WPARAM, LPARAM);int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
  // TODO: Place code here.
  MSG msg;
  HACCEL hAccelTable;  // Initialize global strings
  LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
  LoadString(hInstance, IDC_TESTHOOK, szWindowClass, MAX_LOADSTRING);
  MyRegisterClass(hInstance);  // Perform application initialization:
  if (!InitInstance (hInstance, nCmdShow))
  {
    return FALSE;
  }  hAccelTable = LoadAccelerators(hInstance, (LPCTSTR)IDC_TESTHOOK);  // Main message loop:
  while (GetMessage(&msg, NULL, 0, 0))
  {
    if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
    {
      TranslateMessage(&msg);
      DispatchMessage(&msg);
    }
  }  return msg.wParam;
}//
//  FUNCTION: MyRegisterClass()
//
//  PURPOSE: Registers the window class.
//
//  COMMENTS:
//
//    This function and its usage is only necessary if you want this code
//    to be compatible with Win32 systems prior to the 'RegisterClassEx'
//    function that was added to Windows 95. It is important to call this function
//    so that the application will get 'well formed' small icons associated
//    with it.
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
  WNDCLASSEX wcex;  wcex.cbSize = sizeof(WNDCLASSEX);   wcex.style      = CS_HREDRAW | CS_VREDRAW;
  wcex.lpfnWndProc  = (WNDPROC)WndProc;
  wcex.cbClsExtra   = 0;
  wcex.cbWndExtra   = 0;
  wcex.hInstance    = hInstance;
  wcex.hIcon      = LoadIcon(hInstance, (LPCTSTR)IDI_TESTHOOK);
  wcex.hCursor    = LoadCursor(NULL, IDC_ARROW);
  wcex.hbrBackground  = (HBRUSH)(COLOR_WINDOW+1);
  wcex.lpszMenuName = (LPCSTR)IDC_TESTHOOK;
  wcex.lpszClassName  = szWindowClass;
  wcex.hIconSm    = LoadIcon(wcex.hInstance, (LPCTSTR)IDI_SMALL);  return RegisterClassEx(&wcex);
}//
//   FUNCTION: InitInstance(HANDLE, int)
//
//   PURPOSE: Saves instance handle and creates main window
//
//   COMMENTS:
//
//        In this function, we save the instance handle in a global variable and
//        create and display the main program window.
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
   HWND hWnd;   hInst = hInstance; // Store instance handle in our global variable   hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
      CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);   if (!hWnd)
   {
      return FALSE;
   }   ShowWindow(hWnd, nCmdShow);
   UpdateWindow(hWnd);   return TRUE;
}

<继续>//
//  FUNCTION: WndProc(HWND, unsigned, WORD, LONG)
//
//  PURPOSE:  Processes messages for the main window.
//
//  WM_COMMAND  - process the application menu
//  WM_PAINT  - Paint the main window
//  WM_DESTROY  - post a quit message and return
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
  int wmId, wmEvent;
  PAINTSTRUCT ps;
  HDC hdc;
  TCHAR szHello[MAX_LOADSTRING];
  TCHAR szInput[256];
  LoadString(hInst, IDS_HELLO, szHello, MAX_LOADSTRING);
    switch (message)
  {
    case WM_COMMAND:
      wmId    = LOWORD(wParam);
      wmEvent = HIWORD(wParam);
      // Parse the menu selections:
      switch (wmId)
      {
        case IDM_INSTALLHOOK:
           InstallHook();
           MessageBox(hWnd, "KeyBoard Hook installed!", "Hook demo", MB_OK);
           break;
        case IDM_UNINSTALLHOOK:
           UnHook();
           MessageBox(hWnd, "KeyBoard Hook uninstalled!", "Hook demo", MB_OK);
           break;
        case IDM_ABOUT:
           DialogBox(hInst, (LPCTSTR)IDD_ABOUTBOX, hWnd, (DLGPROC)About);
           break;
        case IDM_EXIT:
           DestroyWindow(hWnd);
           break;
        default:
           return DefWindowProc(hWnd, message, wParam, lParam);
      }
      break;
    case WM_CHAR:
      szInput[0] = wParam;
      szInput[1] = '\0';
      MessageBox(hWnd, szInput, "Key Pressed", MB_OK);
      break;    case WM_PAINT:
      hdc = BeginPaint(hWnd, &ps);
      // TODO: Add any drawing code here...
      RECT rt;
      GetClientRect(hWnd, &rt);
      DrawText(hdc, szHello, strlen(szHello), &rt, DT_CENTER);
      EndPaint(hWnd, &ps);
      break;
    case WM_DESTROY:
      UnHook();
      PostQuitMessage(0);
      break;
    default:
      return DefWindowProc(hWnd, message, wParam, lParam);
   }
   return 0;
}// Mesage handler for about box.
LRESULT CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
  switch (message)
  {
    case WM_INITDIALOG:
        return TRUE;    case WM_COMMAND:
      if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
      {
        EndDialog(hDlg, LOWORD(wParam));
        return TRUE;
      }
      break;
  }
    return FALSE;
}其用到的资源文件如下：//{{NO_DEPENDENCIES}}
// Microsoft Developer Studio generated include file.
// Used by testhook.rc
//
#define IDC_MYICON                      2
#define IDD_TESTHOOK_DIALOG             102
#define IDD_ABOUTBOX                    103
#define IDS_APP_TITLE                   103
#define IDM_ABOUT                       104
#define IDM_EXIT                        105
#define IDS_HELLO                       106
#define IDI_TESTHOOK                    107
#define IDI_SMALL                       108
#define IDC_TESTHOOK                    109
#define IDR_MAINFRAME                   128
#define IDM_INSTALLHOOK                 32771
#define IDM_UNINSTALLHOOK               32772
#define IDC_STATIC                      -1// Next default values for new objects
//
#ifdef APSTUDIO_INVOKED
#ifndef APSTUDIO_READONLY_SYMBOLS
#define _APS_NEXT_RESOURCE_VALUE        129
#define _APS_NEXT_COMMAND_VALUE         32773
#define _APS_NEXT_CONTROL_VALUE         1000
#define _APS_NEXT_SYMED_VALUE           110
#endif
#endif//Microsoft Developer Studio generated resource script.
//
#include "resource.h"#define APSTUDIO_READONLY_SYMBOLS
/////////////////////////////////////////////////////////////////////////////
//
// Generated from the TEXTINCLUDE 2 resource.
//
#define APSTUDIO_HIDDEN_SYMBOLS
#include "windows.h"
#undef APSTUDIO_HIDDEN_SYMBOLS
#include "resource.h"/////////////////////////////////////////////////////////////////////////////
#undef APSTUDIO_READONLY_SYMBOLS/////////////////////////////////////////////////////////////////////////////
// Chinese (P.R.C.) resources#if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_CHS)
#ifdef _WIN32
LANGUAGE LANG_CHINESE, SUBLANG_CHINESE_SIMPLIFIED
#pragma code_page(936)
#endif //_WIN32/////////////////////////////////////////////////////////////////////////////
//
// Icon
//// Icon with lowest ID value placed first to ensure application icon
// remains consistent on all systems.
IDI_TESTHOOK            ICON    DISCARDABLE     "testhook.ICO"
IDI_SMALL               ICON    DISCARDABLE     "SMALL.ICO"/////////////////////////////////////////////////////////////////////////////
//
// Menu
//IDC_TESTHOOK MENU DISCARDABLE
BEGIN
    POPUP "&File"
    BEGIN
        MENUITEM "E&xit",                       IDM_EXIT
    END
    POPUP "Hook"
    BEGIN
        MENUITEM "Install hook",                IDM_INSTALLHOOK
        MENUITEM "Uninstall hook",              IDM_UNINSTALLHOOK
    END
    POPUP "&Help"
    BEGIN
        MENUITEM "&About ...",                  IDM_ABOUT
    END
END
/////////////////////////////////////////////////////////////////////////////
//
// Accelerator
//IDC_TESTHOOK ACCELERATORS MOVEABLE PURE
BEGIN
    "?",            IDM_ABOUT,              ASCII,  ALT
    "/",            IDM_ABOUT,              ASCII,  ALT
END
/////////////////////////////////////////////////////////////////////////////
//
// Dialog
//IDD_ABOUTBOX DIALOG DISCARDABLE  22, 17, 230, 75
STYLE DS_MODALFRAME | WS_CAPTION | WS_SYSMENU
CAPTION "About"
FONT 8, "System"
BEGIN
    ICON            IDI_TESTHOOK,IDC_MYICON,14,9,16,16
    LTEXT           "testhook Version 1.0",IDC_STATIC,49,10,119,8,
                    SS_NOPREFIX
    LTEXT           "Copyright (C) 2003",IDC_STATIC,49,20,119,8
    DEFPUSHBUTTON   "OK",IDOK,195,6,30,11,WS_GROUP
END
#ifdef APSTUDIO_INVOKED
/////////////////////////////////////////////////////////////////////////////
//
// TEXTINCLUDE
//2 TEXTINCLUDE DISCARDABLE
BEGIN
    "#define APSTUDIO_HIDDEN_SYMBOLS\r\n"
    "#include ""windows.h""\r\n"
    "#undef APSTUDIO_HIDDEN_SYMBOLS\r\n"
    "#include ""resource.h""\r\n"
    "\0"
END3 TEXTINCLUDE DISCARDABLE
BEGIN
    "\r\n"
    "\0"
END1 TEXTINCLUDE DISCARDABLE
BEGIN
    "resource.h\0"
END#endif    // APSTUDIO_INVOKED
/////////////////////////////////////////////////////////////////////////////
//
// String Table
//STRINGTABLE DISCARDABLE
BEGIN
    IDS_APP_TITLE           "testhook"
    IDS_HELLO               "Please Select from menu -->hook-->install hook."
    IDC_TESTHOOK            "TESTHOOK"
END#endif    // Chinese (P.R.C.) resources
/////////////////////////////////////////////////////////////////////////////#ifndef APSTUDIO_INVOKED
/////////////////////////////////////////////////////////////////////////////
//
// Generated from the TEXTINCLUDE 3 resource.
//
/////////////////////////////////////////////////////////////////////////////
#endif    // not APSTUDIO_INVOKED

我也对钩子感兴趣，不过我更喜欢勾API。

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