keyboard-hook

How do I trap Windows key, Alt + Tab , and Ctrl + Alt + Delete in a Windows application using C#? You can capture Ctrl-Alt-Delete. But you need to implement your own GINA dll which is loaded by Winlogon. You'll need to code this up in C or C++ as it needs to be a native DLL. Erich Mirabal As Jan stated, you can't capture CTRL-ALT-DEL without writing your own GINA. For the Windows or ALT-TAB keys, you can look at these for help: Capturing Keystrokes without Focus (SO near-duplicate) How To Set A Windows Hook Hooks (low-level, but will explain what you need for the P/Invoke) Almost by definition

I'm trying to set a low level windows keyboard hook to grab three keys pressed even if the application is not in focus. To do this I'm calling SetWindowsHookEx as // Create an instance of HookProc. KeyboardHookProcedure = new HookProc(KeyboardHookProc); //install hook hKeyboardHook = SetWindowsHookEx( WH_KEYBOARD_LL, KeyboardHookProcedure, Marshal.GetHINSTANCE( Assembly.GetExecutingAssembly().GetModules()[0]), 0); //If SetWindowsHookEx fails. if (hKeyboardHook == 0) { //Returns the error code returned by the last unmanaged function called using platform invoke that has the DllImportAttribute

I tried to write a program which hooks keyboard messages to pronounce the name of each key whenever it is pressed in Ubuntu (KDE); without interfering with normal action of keyboard in programs (just announcing the key name). This is my program: #include <X11/Xlib.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <iostream> using namespace std; void SendPressKeyEvent(Display *display, XKeyEvent xkey) { Window current_focus_window; int current_focus_revert; XGetInputFocus(display, &current_focus_window, &current_focus_revert); xkey.type = KeyPress; xkey.display = display;

It seems that if you call ToAscii() or ToUnicode() while in a global WH_KEYBOARD_LL hook, and a dead-key is pressed, it will be 'destroyed'. For example, say you've configured your input language in Windows as Spanish, and you want to type an accented letter á in a program. Normally, you'd press the single-quote key (the dead key), then the letter "a", and then on the screen an accented á would be displayed, as expected. But this doesn't work if you call ToAscii() or ToUnicode() in a low-level keyboard hook function. It seems that the dead key is destroyed, and so no accented letter á shows up