Re: wh_callwndProc hook problem

From:

=?Utf-8?B?U3JpZGhhcg==?= <Sridhar@discussions.microsoft.com>

Newsgroups:

microsoft.public.vc.language

Date:

Mon, 7 Sep 2009 00:41:01 -0700

Message-ID:

<9408312B-C474-4EFD-A171-CC4F18A6B795@microsoft.com>

thanks for your reply...i need to do using hook..becoz now i am trying with
notepad...after that i have to extend it for all applications..
here is the code for hook filter function i am using..when i execute the
program is writing classname==iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
etc..
but i am not getting the original classname..it is not entering into the if
condition.

DECLDIR LRESULT CALLBACK MsgHookProc(int nCode,WPARAM wParam,LPARAM lParam)
{

char window_class_name[250];
CWPSTRUCT *msg_str = NULL;

bool bHandleMsg=false;

if(nCode<0)
return CallNextHookEx(ghKeyHook,nCode,wParam,lParam);
if(HC_ACTION==nCode)
{

OutputDebugStringA("MsgHookProc() has been called\n");

bHandleMsg=true;
msg_str = (CWPSTRUCT *) lParam;

//HWND hWnd= hHook.hwnd;
//HMENU hMenuHandle=GetMenu(hWnd);
//handleMenus(hMenuHandle);
if (msg_str->message == WM_CREATE)
{
    GetClassName(msg_str->hwnd, window_class_name, sizeof(window_class_name) -
1);
}

FILE *fp;
fp=fopen("C:\\Logdll.txt","ab");
fprintf(fp,"\nClassName==%s\n ",window_class_name);
if (strcmp(window_class_name, "Notepad") == 0)
{
   fprintf(fp,"\nSTART RECORDING....\n ");
   fprintf(fp,"\nClassName==%s\n ",window_class_name);
}

}
return (bHandleMsg?true:
    ::CallNextHookEx(ghKeyHook,nCode,wParam,lParam));

}

if i put break point in this function it is not hitting while debugging(F5)
my application (not dll). it is giving some out put but why it is not hitting
the break point and why it is not writing callname.
please help me on this..
--
--------------------------------------------
At last i learned something for today...:)

"xiaosi" wrote:

If you post the whole codes, I may reproduce the problem and debug it.
I think subclassing notepad main window is better than hooking.
For me, msdn is enough for learning windows hooking.

"Sridhar" <Sridhar@discussions.microsoft.com> wrote:

HI Friends,
I am trying to hook notepad and i want to get which menu items in
notepad is clicked etc..i wrote one simple dll.i am using wh_callwndproc
hook. the problem is.. it is running fine for some time..after that showing
notepad encounter a problem..message i am getting then i have to close
notepad.

here is my dll code where i am hooking..

DECLDIR bool InstallMsgHookProc()
{
hWnd=FindWindow("NotePad",NULL);
/*
if(NULL==hWnd)
{
hWnd=GetForegroundWindow();
}
*/
processId=GetWindowThreadProcessId(hWnd,&processId);

bool bSuccess=false;
if(!ghKeyHook)
{
//ghWndMain=hWnd;
glpfnHookProc=(HOOKPROC)MsgHookProc;

bSuccess=(NULL!= (ghKeyHook=
::SetWindowsHookEx(WH_CALLWNDPROC,glpfnHookProc,ghInstance,processId)));
}
return bSuccess;

}

please tell me what i am doing wrong..from two weeks i am trying for this...
i put one break point in filter function but it is not hitting..

and also if you know plz tell me using which books or site to learn windows
hooking is best.

Thanks in advance..

--
--------------------------------------------
At last i learned something for today...:)