vkcode | VK Code Highlighter | QRCode Processing library

I'm trying convert a string to VKCode using this reference, but when try compile, comes the following error's:

E2001 Ordinal type required

E2010 Incompatible types: 'Integer' and 'string'

This means that case (expression) of not is a option to be used here?

I've written a simple program that listens to the caps-lock key, and shows a message box saying wether the caps lock is currently on or off. So: user presses caps-lock, program determines what state the caps-lock is in now (on or off) and displays a message box. What actually happens is that when the caps-lock is turned on, the program displays the message box saying it is off and vice versa.

I've read the documentation of the functions, but still don't understand this unwanted (opposite) behavior and would like to know how (and if) this can be fixed.

Here's my code:

I'm trying to implement keyboard input in C and I don't understand how to capture modified keycodes and get a character from it. Sure, I can create a huge switch statement like this:

I want to break from the windows message loop. Just like C++ how to break message loop in windows hook . I came up with one solution, which works fine for Window Desktop Application, but fails for Console Application. How can this happen?

EDIT: I upload my codes to https://github.com/hellohawaii3/Experiment , clone it and then you can reproduce my problem quickly. Thanks!

1.Why I want to do so?

I am writing a console application. First, users are asked to set some options which determine app's behaviors. Then, the app start the message loop and monitor the input of the keyboard/mouse. Users may want to change the setting, so I want to enable users to press some hotkey, quit from the message loop and go back to the beginning of the application.

If you know any way to implement this function without worrying about breaking from the message loop, please tell me! However, I also want to know why my solution fails for console app and works well for desktop app. Thanks for your help!

2.What have I tried.

I use a bool variable 'recieve_quit'. When certain key is pressed on the keyboard, the variable is setting to True by the hook callback function. For every loop getting message, check the variable 'recieve_quit' first and quit when the variable is False.

3.Result of my experiment

For Console APP, The variable 'recieve_quit' is set correctly when certain key is pressed, however, the message loop continues.

For Windows Desktop APP with GUI, I can quit from the message loop as expected.

4.Experiment settings

I am using VS2019, C++, windows 10 home 1909.

I use dll inject to set hook for my console app.

5.My code

I provide toy example codes here, most of which is generated by Visual Studio automatically, do not bother if you think my codes are too loog.

(a)My console app

Console:

This is simple Windows C++ keylogger example

When I run it in Visual Studio, HookCallback is called correctly.

I want to do the same thing using node-addon-api in Node.js but I don't want to log key presses in a file, I want to send the keycode values to the JavaScript world using a callback.

Here's my repository. This is what I'm doing...

JavaScript

In my Java code, I would like to simulate invisible mouse click on certain screen coordinates (x, y) when key Q is pressed. It should be invisible for human eye: mouse move -> mouse click -> mouse move back.

I am using JNA 5.6.0 and jna-platform 5.6.0 for this purpose which use native WinAPI functions. I implemented Low level keyboard hook inside LowLevelKeyboardProc() {callback()}that intercepts keystrokes. For mouse click simulation I am using SendInput().

I was expected that mouse click should be done on certain global screen coordinates (x, y). In my code example, coordinates are 40, 40.

But instead of expected result I got:

• the mouse movement and mouse click but without returning it back to the start position where cursor was located before click.
• mouse moves and makes a click by coordinates 40, 40 from current mouse position and not by the coordinates of the global screen.

The best way to demonstate this behavior, run the code provided below, open Paint, select the brush tool and press 'Q' button.

This is how it looks like:

As you may see cursor doesn't move back to the start position after first time pressing Q button. The next presses of the Q button have more distance between clicked point and current mouse position and this distance differs after first pressing Q button.

I setup a handler to catch keystrokes for a short time while using a private message loop for the window. And while it works, if I try the PostThreadMessage the window never receives the message?

The callback looked like (I tried other messages to, this one sample was with a private message):

I have Swing application on Windows 10. Also I added Low Level Keyboard hook which should intercept keyboard events and remap for example 'z' to 's' button.

This is needed to hook keyboard events outside my java application. I have implemented it using JNA version 5.6.0 and jna-platform version 5.6.0. It works fine but not inside my Swing application.

My problem is when the hook is ON, swing application a kind of locked. I can not press to any Jbutton and even close Jframe at all.

My guess is that it has something to do with threads, but I'm very weak at threads and multithreading.

Reproducible example.

TestFrame class:

Solved. See my answer below.

In my code I'm trying to remap keyboad keys, e.g. z -> s. I'm using JNA library 5.6.0 and jna-platform 5.6.0, but people who familiar with C languages can understand me too because JNA is using WinAPI functions from User32 and Kernel32 dll's.

My problem is that the newkey is printing twice and between newkeys the oldkey appears. When I type 'z' it should print 's', but it's printing 'szs'.

My code: