KeyCount.docx
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KeyCount
KybdHk.c
/****************************************************************
Modulename:
KybdHk.c
Writtenby:
JonathanLocke
Notices:
Copyright（c）1995JeffreyRichter
Purpose:
Dllwhichsetsasystemkeyboardhook.
****************************************************************/
#include"Win95ADG.h"/*SeeAppendixAfordetails*/
#include
#include
#include
#pragmawarning（disable:
4001）/*Singlelinecomment*/
//WemustdefineKYBDHKLIBAPIas'dllexport'beforeincludingKybdHk.h.
//KybdHk.hwillseethatwehavealreadydefinedKYBDHKLIBAPIand
//willnot（re）defineitas'dllimport'.
#defineKYBDHKLIBAPI__declspec（dllexport）
#include"KybdHk.h"
/////////////////////////////////////////////////////////////////
HINSTANCEg_hinstDll=NULL;//KybdHk.dll'sinstancehandle
/////////////////////////////////////////////////////////////////
//CallingSetWindowsHookExwithathreadIdofzerowillcausethisDLLtobe
//injectedintootherprocesses.Therefore,wemustdeclareashareddata
//sectionsothatallmappingsofourDLL（inallprocesses）sharethesame
//setofglobalvariables.
//#pragmacomment（lib,"kernel32""-section:
Shared,rws"）
#pragmadata_seg（"Shared"）
HHOOKg_hhook=NULL;//Hookhandleforsystem-widekeyboardhook
HWNDg_hwndPost=NULL;//Windowtonotifyofkeyboardevents
UINTg_uMsgNotify=WM_NULL;//Notificationmessagetoposttog_hwndPost
HWNDg_hwndEdit=NULL;//Characterstorejectwithhook
#pragmadata_seg（）
//#pragmacomment（linker"/section:
Shared,rws"）
/////////////////////////////////////////////////////////////////
staticLRESULTWINAPIKeyboardHook_HookProc（intnCode,
WPARAMwParam,LPARAMlParam）{
LRESULTlResult=CallNextHookEx（g_hhook,nCode,wParam,lParam）;
if（nCode==HC_ACTION）{
TCHARac[2];
BYTEbKeyState[256];
UINTuScanCodeAndShiftState=HIWORD（lParam）&（0x00FF|KF_UP）;
//Notifyapplication'swindowthatthisthreadreceivedakeystroke
PostMessage（g_hwndPost,g_uMsgNotify,wParam,lParam）;
//TranslatekeystroketoANSIorUnicodeandrejectitifit'sone
//ofthecharactersing_hwndEdit.
GetKeyboardState（bKeyState）;
#ifdefUNICODE
if（ToUnicode（wParam,uScanCodeAndShiftState,bKeyState,ac,1,0）==1）{
#else
if（ToAscii（wParam,uScanCodeAndShiftState,bKeyState,（PWORD）ac,0）==1）{
#endif
TCHARsz[256];
FORWARD_WM_GETTEXT（g_hwndEdit,adgARRAY_SIZE（sz）,sz,SendMessage）;
if（_tcschr（sz,ac[0]））{
//Rejectthekeyevent.
lResult=1;
}
}
}
return（lResult）;
}
/////////////////////////////////////////////////////////////////
BOOLWINAPIKeyboardHook_Start（HWNDhwndPost,UINTuMsgNotify,HWNDhwndEdit）{
HHOOKhhook;
//ReturnFALSEifhookhasalreadybeeninstalled.
if（g_hhook!
=NULL）
return（FALSE）;
adgASSERT（IsWindow（hwndPost））;
g_hwndPost=hwndPost;
g_uMsgNotify=uMsgNotify;
g_hwndEdit=hwndEdit;
//Giveuptheremainderofourthread'stimeslice.
//Thisgivesusabetterchanceofgettingallthewaythroughthecall
//toSetWindowsHookExandthevariableassignmenttog_hhookinoneshot.
//Ifwearepreemptedafterthehookisset,butbeforethevariableis
//updated,itispossibleforanotherthreadtoenterourhookfilter
//functionbeforethehookhandleisvalid.UnderWindowsNTthisisnot
//aproblem.UnderWindows95,nothavingavalidhookhandlewillcause
//CallNextHookExtofail.Ifthereissomereasonthatitiscritical
//thatyourapplicationsucceedincallingthenextfilterfunctionin
//thechain,theonlyrobustwaytowritethiscodeistousesomething
//liketheSWMRG（single-writer,multiple-readerguard）objectdeveloped
//inAdvancedWindows（MicrosoftPress）.
Sleep（0）;
//Setourkeyboardhook.
hhook=SetWindowsHookEx（WH_KEYBOARD,
KeyboardHook_HookProc,g_hinstDll,0）;
//Ensurethatg_hhookisalwaysvalid（evenifwearepreemptedwhilst
//inthemiddleofwritingtoit）byupdatingthevariableatomically.
InterlockedExchange（（PLONG）&g_hhook,（LONG）hhook）;
return（g_hhook!
=NULL）;
}
/////////////////////////////////////////////////////////////////
BOOLWINAPIKeyboardHook_Stop（）{
BOOLfOK=TRUE;
//Onlyuninstallthehookifitwassuccessfullyinstalled.
if（g_hhook!
=NULL）{
fOK=UnhookWindowsHookEx（g_hhook）;
g_hhook=NULL;
}
return（fOK）;
}
/////////////////////////////////////////////////////////////////
BOOLWINAPIDllMain（HINSTANCEhinstDll,DWORDfdwReason,LPVOIDlpvReserved）{
switch（fdwReason）{
caseDLL_PROCESS_ATTACH:
g_hinstDll=hinstDll;
break;
}
return（TRUE）;
}
KeyCount.c
/***************************************************************
Modulename:
KeyCount.c
Writtenby:
JonathanLocke
Notices:
Copyright（c）1995JeffreyRichter
Purpose:
Keyboardhooksdemonstrationapplication
****************************************************************/
#include"Win95ADG.h"/*SeeAppendixAfordetails*/
#include
#include
#pragmawarning（disable:
4001）/*Singlelinecomment*/
#include
#include"KybdHk.h"
#include"KeyCount.h"
#include"Resource.h"
#pragmawarning（disable:
4001）/*Singlelinecomment*/
/////////////////////////////////////////////////////////////////
//ForcealinkwiththeimportlibraryforKybdHk.dll
#pragmacomment（lib,adgLIBBUILDTYPEadgLIBCPUTYPE"\\""KybdHk"）
/////////////////////////////////////////////////////////////////
#defineGETKEYCOUNT（hwnd）（（UINT）GetWindowLong（hwnd,GWL_USERDATA））
#defineSETKEYCOUNT（hwnd,c）SetWindowLong（hwnd,GWL_USERDATA,（UINT）c）
/////////////////////////////////////////////////////////////////
BOOLKeyCount_OnInitDialog（HWNDhwnd,HWNDhwndFocus,LPARAMlParam）{
adgSETDLGICONS（hwnd,IDI_KEYCOUNT,IDI_KEYCOUNT）;
//Makethekeycountdialogtopmostsothatitiseasytowatchkeysin
//applicationsthattakeupmostorallofthescreen.
SetWindowPos（hwnd,HWND_TOPMOST,0,0,0,0,SWP_NOMOVE|SWP_NOSIZE）;
EnableWindow（GetDlgItem（hwnd,IDC_START）,TRUE）;
EnableWindow（GetDlgItem（hwnd,IDC_STOP）,FALSE）;
//Resetkeystrokecount.
SETKEYCOUNT（hwnd,0）;
return（TRUE）;//Acceptdefaultfocuswindow.
}
/////////////////////////////////////////////////////////////////
voidKeyCount_OnKeyEvent（HWNDhwnd,UINTvk,LPARAMlParam）{
BOOLfDown=（（HIWORD（lParam）&KF_UP）==0）;
TCHARsz[128];
UINTuKeyCount=GETKEYCOUNT（hwnd）;
TCHARc=（TCHAR）LOWORD（MapVirtualKey（vk,2））;
if（fDown）
uKeyCount++;
SetDlgItemInt（hwnd,IDC_KEYCOUNT,uKeyCount,FALSE）;
wsprintf（sz,__TEXT（"char=%c,virtualkey=%d<%s>"）,
IsCharAlphaNumeric（c）?
c:
__TEXT（'?
'）,vk,
fDown?
__TEXT（"pressed"）:
__TEXT（"released"））;
SetDlgItemText（hwnd,IDC_LASTKEY,sz）;
SETKEYCOUNT（hwnd,uKeyCount）;
}
/////////////////////////////////////////////////////////////////
voidKeyCount_OnCommand（HWNDhwnd,intid,HWNDhwndCtl,UINTcodeNotify）{
HWNDhwndEdit;
switch（id）{
caseIDCANCEL:
//Allowsdialogboxtoclose.
//Unhookkeyboardhookbeforeexiting.
if（!
KeyboardHook_Stop（））
adgMB（__TEXT（"Unabletostopkeyboardhook"））;
EndDialog（hwnd,id）;
break;
caseIDC_START:
hwndEdit=GetDlgItem（hwnd,IDC_EDIT）;
if（KeyboardHook_Start（hwnd,UM_KEYEVENT,hwndEdit））{
SetDlgItemText（hwnd,IDC_LASTKEY,__TEXT（""））;
SetDlgItemInt（hwnd,IDC_KEYCOUNT,0,FALSE）;
SETKEYCOUNT（hwnd,0）;
EnableWindow（GetDlgItem（hwnd,IDC_START）,FALSE）;
EnableWindow（GetDlgItem（hwnd,IDC_STOP）,TRUE）;
SetFocus（GetDlgItem（hwnd,IDC_STOP））;
}else{
adgMB（__TEXT（"Unabletostartkeyboardhook"））;
}
break;
caseIDC_STOP:
if（!
KeyboardHook_Stop（））
adgMB（__TEXT（"Unabletostopkeyboardhook"））;
EnableWindow（GetDlgItem（hwnd,IDC_START）,TRUE）;
EnableWindow（GetDlgItem（hwnd,IDC_STOP）,FALSE）;
SetFocus（GetDlgItem（hwnd,IDC_START））;
break;
}
}
////////////////////////////////////////////////////////////////
BOOLWINAPIKeyCount_DlgProc（HWNDhwnd,UINTuMsg,WPARAMwParam,LPARAMlParam）{
switch（uMsg）{
//StandardWindowsmessages
adgHANDLE_DLGMSG（hwnd,WM_INITDIALOG,KeyCount_OnInitDialog）;
adgHANDLE_DLGMSG（hwnd,WM_COMMAND,KeyCount_OnCommand）;
//Keyboardhooknotificationmessage
adgHANDLE_DLGMSG（hwnd,UM_KEYEVENT,KeyCount_OnKeyEvent）;
}
return（FALSE）;//Wedidn'tprocessthemessage.
}
///////////////////////////////////////////////////////////////
intWINAPIWinMain（HINSTANCEhinstExe,HINSTANCEhinstPrev,
LPSTRlpszCmdLine,intnCmdShow）{
adgWARNIFUNICODEUNDERWIN95（）;
adgVERIFY（-1!
=DialogBox（hinstExe,MAKEINTRESOURCE（IDD_KEYCOUNT）,
NULL,KeyCount_DlgProc））;
return（0）;
}
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