C ++ Win32键盘事件 [英] C++ Win32 keyboard events
问题描述
我正在按照我的按键记录器的个人兴趣,并提出了一个有关昨天的问题; 循环使用大量CPU 。
I am working on my keystroke logger for personal interest and asked a question related to this about yesterday; While loop using a lot of CPU.
该程序的问题是CPU使用量过多,人们建议以输入密钥事件为基础。
The issue with the program was that it took too much CPU Usage, and people have suggested to make the inputs key-event based.
由于我是Win32 API的新手,我尝试寻找引用和教程,这将告诉我如何创建基于事件的键盘输入,而不是基于轮询。但问题是我找不到任何坚实的例子或参考资料,因为一个完整的新手很难理解。
Since I'm new to the Win32 API, I try to look for references and tutorials that will tell me how to create keyboard inputs as event-based, rather than poll based. But the problems is I could not found any solid examples or references, as it was quite difficult to understand for a complete newbie.
大多数人提到基于事件的编程驻留在GUI应用程序中,但是我希望这个按键记录器应用程序是一个控制台应用程序。
Most of them mentioned that the event-based programming resided in GUI application, yet I want this keystroke logger application to be a console application.
我的两个主要问题是:
- 我可以写一个基于事件的控制台按键记录器Win32 API?如果没有,我的选择是什么?
和
- 有没有人有任何参考网站可以帮助我了解如何捕获基于事件的击键?
如果附加信息是需要的是,我在Windows XP下使用GCC编译器使用代码块。
If additional information is needed, I am using Code Blocks under Windows XP with a GCC compiler.
推荐答案
密钥记录器应用程序使用诸如 Win32 Hooks 。具体来说,您需要设置一个 WH_KEYBOARD
钩子。
Key logger applications use mechanisms such as Win32 Hooks. Specifically you need to set a WH_KEYBOARD
hook.
有移动高级技术,如创建自己的键盘驱动程序,对于一个开始的钩子是一个不错的选择。
There are move advanced techniques, like creating your own keyboard driver but for a start hooks are a good choice.
编辑:要了解钩子程序的样子,我发布一个片段我的个人实用程序。
To get an idea of how a hook procedure looks like, I post a fragment from my personal utility.
// ...
thehook = SetWindowsHookEx( WH_KEYBOARD_LL, hook_proc, hwnd, 0 );
// ...
/**
*
* wParam, one of the: WM_KEYDOWN, WM_KEYUP, WM_SYSKEYDOWN, or WM_SYSKEYUP
lParam: pointer to a KBDLLHOOKSTRUCT structure
(*) "The hook procedure should process a message in less time than the
data entry specified in the LowLevelHooksTimeout value in the following registry key:
HKEY_CURRENT_USER\Control Panel\Desktop
The value is in milliseconds. If the hook procedure does not
return during this interval, the system will pass the message to the next hook."
*
*/
LRESULT CALLBACK
hook_proc( int code, WPARAM wParam, LPARAM lParam )
{
static long ctrl_cnt = 0;
static bool mmode = false;
static DWORD time;
KBDLLHOOKSTRUCT* kbd = (KBDLLHOOKSTRUCT*)lParam;
if ( code < 0
|| (kbd->flags & 0x10) // ignore injected events
) return CallNextHookEx( thehook, code, wParam, lParam );
long ret = 1; // by default I swallow the keys
if ( mmode ) { // macro mode is ON
if ( WM_KEYDOWN == wParam )
PostMessage(mainwnd, WM_MCR_ACCUM, kbd->vkCode, 0);
if ( WM_KEYUP == wParam )
switch (kbd->vkCode) {
case VK_ESCAPE:
mmode = false;
keys.removeall();
PostMessage(mainwnd, WM_MCR_HIDE, 0, 0);
break;
case VK_RETURN:
PostMessage(mainwnd, WM_MCR_EXEC, 0, 0);
break;
case VK_LCONTROL:
mmode = false;
PostMessage(mainwnd, WM_MCR_HIDE, 0, 0);
PostMessage(mainwnd, WM_MCR_EXEC, 0, 0);
break;
}
/* Which non printable keys allow passing? */
switch( kbd->vkCode ) {
case VK_LCONTROL:
case VK_CAPITAL:
case VK_LSHIFT:
case VK_RSHIFT:
ret = CallNextHookEx( thehook, code, wParam, lParam );
}
}
else { // macro mode is OFF
/* Ctrl pressed */
if ( kbd->vkCode == VK_LCONTROL && WM_KEYDOWN == wParam ) {
ctrl_cnt = 1;
time = kbd->time;
}
/* Prevent ctrl combinations to activate macro mode */
if ( kbd->vkCode != VK_LCONTROL )
ctrl_cnt = 0;
/* Ctrl released */
if ( ctrl_cnt == 1 && WM_KEYUP == wParam ) {
if ( kbd->time - time > 40 ) {
mmode = true;
PostMessage(mainwnd, WM_MCR_SHOW, 0, 0);
}
}
ret = CallNextHookEx( thehook, code, wParam, lParam ); // let it pass
}
return ret;
}
这篇关于C ++ Win32键盘事件的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!