BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  How to hook the keyboard? Goto page 1, 2  Next          BorlandTalk.com Forum Index -> C++ Builder (Non-Technical) View previous topic :: View next topic   Author Message feicoremvethis@gmx.net Guest Posted: Wed Nov 19, 2003 1:03 pm    Post subject: How to hook the keyboard? Dear friends I want to write a program that intercepts keyboard input. I have tried something with a program named SetWindowsHookEx. It compiles without requiring a header, but it cannot be executed. I think I do not know what arguments to use. The documentation is rather enigmatic. Can anyone help me? -- Feico Back to top Yu-Chen Hsueh Guest Posted: Wed Nov 19, 2003 4:28 pm    Post subject: Re: How to hook the keyboard? Feico, I sent you some demo code via private e-mail. Please post any replies here rather than through private mail. -- YH -- -- Any e-mail sent to me from the newsgroups will be ignored. Please confine your posts to the newsgroups and DO NOT reply to this e-mail account. Back to top Remy Lebeau (TeamB) Guest Posted: Wed Nov 19, 2003 5:47 pm    Post subject: Re: How to hook the keyboard? <feicoremvethis (AT) gmx (DOT) net> wrote Quote: I want to write a program that intercepts keyboard input. You are asking a technical question in a non-technical group. You should post to the .nativeapi group instead. Gambit Back to top feicoremvethis@gmx.net Guest Posted: Wed Nov 19, 2003 6:17 pm    Post subject: Re: How to hook the keyboard? On Wed, 19 Nov 2003 09:47:31 -0800, "Remy Lebeau (TeamB)" <gambit47.no.spam (AT) no (DOT) spam.yahoo.com> wrote in borland.public.cppbuilder.non-technical: Quote: You are asking a technical question in a non-technical group. You should post to the .nativeapi group instead. I tried that, but that group is not provided by my ISP. -- Feico Back to top Ed Mulroy [TeamB] Guest Posted: Wed Nov 19, 2003 6:24 pm    Post subject: Re: How to hook the keyboard? Quote: I tried that, but that group is not provided by my ISP. You are not accessing the groups correctly and will loose messages and replies. This is NOT a Usenet newsgroup. Your ISP grabs it for some unknown reason. Tell your news reader to access the news server newsgroups.borland.com .. Ed Quote: Feico wrote in message news:4qcnrv0p9ngjrpdr9t1c38h26fi7j335g2 (AT) 4ax (DOT) com... Remy Lebeau wrote: You are asking a technical question in a non-technical group. You should post to the .nativeapi group instead. I tried that, but that group is not provided by my ISP. Back to top Remy Lebeau (TeamB) Guest Posted: Wed Nov 19, 2003 6:52 pm    Post subject: Re: How to hook the keyboard? <feicoremvethis (AT) gmx (DOT) net> wrote Quote: I tried that, but that group is not provided by my ISP. You should be accessing Borland's own newsserver directly: forums.borland.com or newsgroups.borland.com Do not use your ISP's server. Gambit Back to top Feico Guest Posted: Wed Nov 19, 2003 7:08 pm    Post subject: Re: How to hook the keyboard? On Wed, 19 Nov 2003 10:52:42 -0800, "Remy Lebeau (TeamB)" <gambit47.no.spam (AT) no (DOT) spam.yahoo.com> wrote in borland.public.cppbuilder.non-technical: Quote: You should be accessing Borland's own newsserver directly: forums.borland.com or newsgroups.borland.com Do not use your ISP's server. I see lots of newsgroups on http://info.borland.com/newsgroups/ng_cbuilder.html but many of these appear not to be available, even if I select newsgroups.borland.com. But I'll keep trying. Back to top Remy Lebeau (TeamB) Guest Posted: Wed Nov 19, 2003 7:57 pm    Post subject: Re: How to hook the keyboard? "Feico" <feicorem0veth1s (AT) gmx (DOT) net> wrote Quote: I see lots of newsgroups on http://info.borland.com/newsgroups/ng_cbuilder.html but many of these appear not to be available, even if I select newsgroups.borland.com. I can assure you that they are available on Borland's server. If you have not done so, do a full refresh of the server's newsgroup listing. Gambit Back to top Feico Guest Posted: Wed Nov 19, 2003 9:25 pm    Post subject: Re: How to hook the keyboard? On Wed, 19 Nov 2003 11:57:59 -0800, "Remy Lebeau (TeamB)" <gambit47.no.spam (AT) no (DOT) spam.yahoo.com> wrote in borland.public.cppbuilder.non-technical: Quote: I can assure you that they are available on Borland's server. If you have not done so, do a full refresh of the server's newsgroup listing. Yes, I found it now. I don't understand why it wasn't there initially. So let's continue the thread there. Back to top Feico Guest Posted: Wed Nov 19, 2003 9:34 pm    Post subject: Re: How to hook the keyboard? On Wed, 19 Nov 2003 08:28:37 -0800, "Yu-Chen Hsueh" <ychsueh (AT) borland (DOT) com> wrote in borland.public.cppbuilder.non-technical: Quote: I sent you some demo code via private e-mail. Please post any replies here rather than through private mail. Thanks, this is really helpful. A function is hooked by calling SetWindowsHookEx(WH_KEYBOARD_LL, (HOOKPROC)LowLevelKeyboardProc, hInstance, 0); The biggest problem is the value of hInstance, I think, which appears only to be available in a DLL, not in an EXE. This problem is now solved. However, I still find some funny behaviour. The function LowLevelKeyboardProc executes this: if(key must be disabled) return 1; else CallNextHookEx (hKeyboardHook, nCode, wParam, lParam); Actually it appears to disable every key, until I remove the hook. Of course I wondered what happened, so I put a MessageBox in the function. Well, this MessageBox is displayed twice whenever a key is hit. Even more surprising: no more keys are disabled when the MessageBox is included. Back to top Remy Lebeau (TeamB) Guest Posted: Wed Nov 19, 2003 9:49 pm    Post subject: Re: How to hook the keyboard? "Feico" <feicorem0veth1s (AT) gmx (DOT) net> wrote Quote: The biggest problem is the value of hInstance, I think, which appears only to be available in a DLL, not in an EXE. Not true. You can use the global HInstance variable for an EXE, which is obtained from the startup code that triggers WinMain(). However, if you're calling SetWindowsHookEx() from inside the EXE itself, then chances are you're only going to be hooking just that EXE to begin with, not all running EXEs, so you could set the hInstance parameter to NULL. Quote: Actually it appears to disable every key, until I remove the hook. How exactly are you determine that keys need to be disabled? I would guess a bug in that logic is returning 'true' for every key, rather than just the keys you're actually interested in. Gambit Back to top Feico Guest Posted: Thu Nov 20, 2003 7:56 am    Post subject: Re: How to hook the keyboard? On Wed, 19 Nov 2003 08:28:37 -0800, "Yu-Chen Hsueh" <ychsueh (AT) borland (DOT) com> wrote in borland.public.cppbuilder.non-technical: Quote: I sent you some demo code via private e-mail. Please post any replies here rather than through private mail. Thanks Yu, that was very helpful, although the statement if (pkbhs->vkCode == VK_LWIN || VK_RWIN) caused me some trouble. Back to top Yu-Chen Hsueh Guest Posted: Thu Nov 20, 2003 5:55 pm    Post subject: Re: How to hook the keyboard? Feico, Sorry about that. I wrote it some time ago, and honestly don't remember all the details. It wasn't for production, mainly just for fun, so some of the logic could definitely be flakey. Hopefully it helped you get headed on the right path, though. Take care, -- YH -- -- Any e-mail sent to me from the newsgroups will be ignored. Please confine your posts to the newsgroups and DO NOT reply to this e-mail account. Back to top Remy Lebeau (TeamB) Guest Posted: Thu Nov 20, 2003 6:14 pm    Post subject: Re: How to hook the keyboard? "Feico" <feicorem0veth1s (AT) gmx (DOT) net> wrote Quote: Thanks Yu, that was very helpful, although the statement if (pkbhs->vkCode == VK_LWIN || VK_RWIN) caused me some trouble. That is not a valid statement. Well, it is, but it does not do what you think it does. You have to test each condition individually instead: if( (pkbhs->vkCode == VK_LWIN) || (pkbhs->vkCode == VK_RWIN) ) Gambit Back to top Saulo I. Regis Guest Posted: Fri Nov 21, 2003 10:46 am    Post subject: Re: How to hook the keyboard? Hi Yu-Chen, I would appreciate if you could send this demo also to me. 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