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    <p>Key logger applications use mechanisms such as <a href="http://msdn.microsoft.com/en-us/library/ms997537.aspx." rel="noreferrer">Win32 Hooks</a>. Specifically you need to set a <code>WH_KEYBOARD</code> hook.</p> <p>There are move advanced techniques, like creating your own keyboard driver but for a start hooks are a good choice.</p> <p><strong>Edit:</strong> To get an idea of how a hook procedure looks like, I post a fragment from my personal utility.</p> <pre><code>// ... 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 &lt; 0 || (kbd-&gt;flags &amp; 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-&gt;vkCode, 0); if ( WM_KEYUP == wParam ) switch (kbd-&gt;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-&gt;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-&gt;vkCode == VK_LCONTROL &amp;&amp; WM_KEYDOWN == wParam ) { ctrl_cnt = 1; time = kbd-&gt;time; } /* Prevent ctrl combinations to activate macro mode */ if ( kbd-&gt;vkCode != VK_LCONTROL ) ctrl_cnt = 0; /* Ctrl released */ if ( ctrl_cnt == 1 &amp;&amp; WM_KEYUP == wParam ) { if ( kbd-&gt;time - time &gt; 40 ) { mmode = true; PostMessage(mainwnd, WM_MCR_SHOW, 0, 0); } } ret = CallNextHookEx( thehook, code, wParam, lParam ); // let it pass } return ret; } </code></pre>
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    1. POC++ Win32 keyboard events
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