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Reak
I post too much
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Joined: 15 May 2007
Posts: 3496
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 Posted: Tue Dec 02, 2008 12:28 pm Post subject: [vc++] createwindow/ex hook. |
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Hello,
To start off, this has no sense. It's just for fun/to learn.
| Code: | | hook = SetWindowsHookEx(WH_CBT, (HOOKPROC)MyHookProc, hInst, 0); |
| Code: | LRESULT CALLBACK MyHookProc(int nCode, WPARAM wParam, LPARAM lParam)
{
if(nCode == HCBT_CREATEWND){
CBT_CREATEWND *pccw = (CBT_CREATEWND *)lParam;
char szBuf[30];
GetAtomName (LOWORD (pccw->lpcs->lpszClass), szBuf, 30);
if(strcmp(szBuf, "notepad") == 0){
return 1;
}
}
LRESULT lResult = CallNextHookEx(hook, nCode, wParam, lParam);
return lResult;
} |
(return 1 on HCBT_CREATEWND means it wont create it.)
My problem is, it doesn't get the class name correctly.
I already tried returning 1 on all..worked. But let's say I only want to return 1 if the class-name of the Window will be "notepad", how do I do that?
I've been working on that for hours now..without result.
Any idea what I am doing wrong?
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sloppy
Expert Cheater
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Joined: 17 Aug 2008
Posts: 123
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| Posted: Tue Dec 02, 2008 1:14 pm Post subject: |
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| Code: | LRESULT CALLBACK MyHookProc(int nCode, WPARAM wParam, LPARAM lParam)
{
if (nCode < 0)
return CallNextHookEx(hook, nCode, wParam, lParam);
if (nCode == HCBT_CREATEWND)
{
char szBuf[30];
GetClassName((HWND)wParam, szBuf, sizeof(szBuf));
if (strcmp(szBuf, "Notepad") == 0)
{
return 1;
}
}
return CallNextHookEx(hook, nCode, wParam, lParam);
} |
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Reak
I post too much
Reputation: 0
Joined: 15 May 2007
Posts: 3496
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| Posted: Tue Dec 02, 2008 2:15 pm Post subject: |
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Awesome thanks. 
But is there any way I can access the parameters used in CreateWindow from the lParam?
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sloppy
Expert Cheater
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Joined: 17 Aug 2008
Posts: 123
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| Posted: Tue Dec 02, 2008 5:28 pm Post subject: |
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Yep you can still use the lParam, although it doesn't seem very useful to me or I'm doing something wrong. I tried changing the x, y pos for notepad but there was no affect, and the title doesn't seem to be set yet either. /shrugs
| Code: | | CREATESTRUCT *CWndStruc = ((CBT_CREATEWND *)lParam)->lpcs; |
| MSDN Remarks wrote: | Note Because the lpszClass member can contain a pointer to a local (and thus inaccessable) atom, do not obtain the class name by using this member. Use the GetClassName function instead.
Windows NT/2000/XP: You should access the data represented by the lpCreateParams member using a pointer that has been declared using the UNALIGNED type, because the pointer may not be DWORD aligned. |
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Reak
I post too much
Reputation: 0
Joined: 15 May 2007
Posts: 3496
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| Posted: Wed Dec 03, 2008 6:38 am Post subject: |
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I see, that's why it didn't work for me.
Anyway, I tried changing some of the parameters too.
It didn't work on notepad for me either, but on firefox when it creates the Browser window. Set cx, cy, x and y to 100 and it showed up google in a little browser then x).
Thanks alot for all your help x)
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