[英]C++ Win32 keyboard events
I am working on my keystroke logger for personal interest and asked a question related to this about yesterday; 我正在为我的按键记录器工作以获取个人兴趣,并在昨天询问了与此相关的问题; While loop using a lot of CPU .
而循环使用了很多CPU 。
The issue with the program was that it took too much CPU Usage, and people have suggested to make the inputs key-event based. 该程序的问题在于它耗费了太多的CPU使用率,并且人们已经建议将输入设置为基于键的事件。
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. 由于我是Win32 API的新手,因此我尝试寻找能够告诉我如何创建基于事件而非基于轮询的键盘输入的参考和教程。 But the problems is I could not found any solid examples or references, as it was quite difficult to understand for a complete newbie.
但问题是我找不到任何可靠的例子或参考文献,因为对于一个完整的新手来说很难理解。
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. 他们中的大多数人都提到基于事件的编程存在于GUI应用程序中,但我希望这个击键记录器应用程序成为控制台应用程序。
My two main questions from all this is: 我的两个主要问题是:
and 和
If additional information is needed, I am using Code Blocks under Windows XP with a GCC compiler. 如果需要其他信息,我在Windows XP下使用GCC编译器的代码块。
Key logger applications use mechanisms such as Win32 Hooks . 密钥记录器应用程序使用Win32 Hook等机制。 Specifically you need to set a
WH_KEYBOARD
hook. 具体来说,您需要设置
WH_KEYBOARD
挂钩。
There are move advanced techniques, like creating your own keyboard driver but for a start hooks are a good choice. 有移动高级技术,如创建自己的键盘驱动程序,但启动钩子是一个不错的选择。
Edit: To get an idea of how a hook procedure looks like, I post a fragment from my personal utility. 编辑:为了了解钩子程序的样子,我从我的个人实用程序发布了一个片段。
// ...
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;
}
Take a look at the SetWindowsHookEx API. 看一下SetWindowsHookEx API。
You can do this is a console app as well as a windowed app. 你可以这样做是一个控制台应用程序以及一个窗口应用程序。 You will need to put your keyboard hook in a DLL so that you can capture keystrokes in processes other than your own.
您需要将键盘挂钩放在DLL中,以便可以捕获除您自己以外的进程中的击键。
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