Create and use your own input source on Mac. MacOS comes with default input sources for languages, such as Pinyin for Chinese. You can create and add your own input source for any language. To do so, you need a rule file that maps what you type on the keyboard to the characters that are shown. Want to know how to create keyboard shortcuts to do anything on Windows 10? This guide will help. Surprisingly, it’s quite easy to create a quick keybind that can open programs, perform repeatable tasks, and speed up your workflow. Feb 13, 2018 You can input both keys and values using input method and process it to separate the keys and values. Enjoy Coding:-) A top software development tool used by agile teams. Plan, track, and release great software with ease. Get started with Jira software. Try it for free.
On some keyboard layouts, the return and enter key are two different keys, an artifact of the differing handling of newlines by different operating systems. As an example, on the Macintosh, the return key is the usual key, while the enter key is positioned at the lower right of the numeric key pad.
-->The keyboard is used for several distinct types of input, including:
- Character input. Text that the user types into a document or edit box.
- Keyboard shortcuts. Key strokes that invoke application functions; for example, CTRL + O to open a file.
- System commands. Key strokes that invoke system functions; for example, ALT + TAB to switch windows.
When thinking about keyboard input, it is important to remember that a key stroke is not the same as a character. For example, pressing the A key could result in any of the following characters.
- a
- A
- á (if the keyboard supports combining diacritics)
Further, if the ALT key is held down, pressing the A key produces ALT+A, which the system does not treat as a character at all, but rather as a system command.
Key Codes
When you press a key, the hardware generates a scan code. Scan codes vary from one keyboard to the next, and there are separate scan codes for key-up and key-down events. You will almost never care about scan codes. The keyboard driver translates scan codes into virtual-key codes. Virtual-key codes are device-independent. Pressing the A key on any keyboard generates the same virtual-key code.
In general, virtual-key codes do not correspond to ASCII codes or any other character-encoding standard. This is obvious if you think about it, because the same key can generate different characters (a, A, á), and some keys, such as function keys, do not correspond to any character.
That said, the following virtual-key codes do map to ASCII equivalents:
- 0 through 9 keys = ASCII '0' – '9' (0x30 – 0x39)
- A through Z keys = ASCII 'A' – 'Z' (0x41 – 0x5A)
In some respects this mapping is unfortunate, because you should never think of virtual-key codes as characters, for the reasons discussed.
The header file WinUser.h defines constants for most of the virtual-key codes. For example, the virtual-key code for the LEFT ARROW key is VK_LEFT (0x25). For the complete list of virtual-key codes, see Virtual-Key Codes. No constants are defined for the virtual-key codes that match ASCII values. For example, the virtual-key code for the A key is 0x41, but there is no constant named VK_A. Instead, just use the numeric value.
Key-Down and Key-Up Messages
When you press a key, the window that has keyboard focus receives one of the following messages.
The WM_SYSKEYDOWN message indicates a system key Generate public key from private ssh key. , which is a key stroke that invokes a system command. There are two types of system key:
- ALT + any key
- F10
The F10 key activates the menu bar of a window. Various ALT-key combinations invoke system commands. For example, ALT + TAB switches to a new window. In addition, if a window has a menu, the ALT key can be used to activate menu items. Some ALT key combinations do not do anything.
All other key strokes are considered nonsystem keys and produce the WM_KEYDOWN message. This includes the function keys other than F10.
When you release a key, the system sends a corresponding key-up message:
If you hold down a key long enough to start the keyboard's repeat feature, the system sends multiple key-down messages, followed by a single key-up message.
In all four of the keyboard messages discussed so far, the wParam parameter contains the virtual-key code of the key. The lParam parameter contains some miscellaneous information packed into 32 bits. You typically do not need the information in lParam. One flag that might be useful is bit 30, the 'previous key state' flag, which is set to 1 for repeated key-down messages.
As the name implies, system key strokes are primarily intended for use by the operating system. If you intercept the WM_SYSKEYDOWN message, call DefWindowProc afterward. Otherwise, you will block the operating system from handling the command.
Character Messages
Key strokes are converted into characters by the TranslateMessage function, which we first saw in Module 1. This function examines key-down messages and translates them into characters. For each character that is produced, the TranslateMessage function puts a WM_CHAR or WM_SYSCHAR message on the message queue of the window. The wParam parameter of the message contains the UTF-16 character.
As you might guess, WM_CHAR messages are generated from WM_KEYDOWN messages, while WM_SYSCHAR messages are generated from WM_SYSKEYDOWN messages. For example, suppose the user presses the SHIFT key followed by the A key. Assuming a standard keyboard layout, you would get the following sequence of messages:
- **WM_KEYDOWN**: SHIFT **WM_KEYDOWN**: A **WM_CHAR**: 'A'
On the other hand, the combination ALT + P would generate:
- **WM_SYSKEYDOWN**: VK_MENU **WM_SYSKEYDOWN**: 0x50 **WM_SYSCHAR**: 'p' **WM_SYSKEYUP**: 0x50 **WM_KEYUP**: VK_MENU
(The virtual-key code for the ALT key is named VK_MENU for historical reasons.)
The WM_SYSCHAR message indicates a system character. As with WM_SYSKEYDOWN, you should generally pass this message directly to DefWindowProc. Otherwise, you may interfere with standard system commands. In particular, do not treat WM_SYSCHAR as text that the user has typed.
The WM_CHAR message is what you normally think of as character input. The data type for the character is wchar_t, representing a UTF-16 Unicode character. Character input can include characters outside the ASCII range, especially with keyboard layouts that are commonly used outside of the United States. You can try different keyboard layouts by installing a regional keyboard and then using the On-Screen Keyboard feature.
Users can also install an Input Method Editor (IME) to enter complex scripts, such as Japanese characters, with a standard keyboard. For example, using a Japanese IME to enter the katakana character カ (ka), you might get the following messages:
- **WM_KEYDOWN**: VK_PROCESSKEY (the IME PROCESS key) **WM_KEYUP**: 0x4B **WM_KEYDOWN**: VK_PROCESSKEY **WM_KEYUP**: 0x41 **WM_KEYDOWN**: VK_PROCESSKEY **WM_CHAR**: カ **WM_KEYUP**: VK_RETURN
Some CTRL key combinations are translated into ASCII control characters. For example, CTRL+A is translated to the ASCII ctrl-A (SOH) character (ASCII value 0x01). For text input, you should generally filter out the control characters. Also, avoid using WM_CHAR to implement keyboard shortcuts. Instead, use WM_KEYDOWN messages; or even better, use an accelerator table. Accelerator tables are described in the next topic, Accelerator Tables.
The following code displays the main keyboard messages in the debugger. Try playing with different keystroke combinations and see what messages are generated.
Miscellaneous Keyboard Messages
Some other keyboard messages can safely be ignored by most applications.
- The WM_DEADCHAR message is sent for a combining key, such as a diacritic. For example, on a Spanish language keyboard, typing accent (') followed by E produces the character é. The WM_DEADCHAR is sent for the accent character.
- The WM_UNICHAR message is obsolete. It enables ANSI programs to receive Unicode character input.
- The WM_IME_CHAR character is sent when an IME translates a keystroke sequence into characters. It is sent in addition to the usual WM_CHAR message.
Keyboard State
The keyboard messages are event-driven. That is, you get a message when something interesting happens, such as a key press, and the message tells you what just happened. But you can also test the state of a key at any time, by calling the GetKeyState function.
For example, consider how would you detect the combination of left mouse click + ALT key. You could track the state of the ALT key by listening for key-stroke messages and storing a flag, but GetKeyState saves you the trouble. When you receive the WM_LBUTTONDOWN message, just call GetKeyState as follows:
The GetKeyState message takes a virtual-key code as input and returns a set of bit flags (actually just two flags). The value 0x8000 contains the bit flag that tests whether the key is currently pressed.
Most keyboards have two ALT keys, left and right. The previous example tests whether either of them of pressed. You can also use GetKeyState to distinguish between the left and right instances of the ALT, SHIFT, or CTRL keys. For example, the following code tests if the right ALT key is pressed.
The GetKeyState function is interesting because it reports a virtual keyboard state. This virtual state is based on the contents of your message queue, and gets updated as you remove messages from the queue. As your program processes window messages, GetKeyState gives you a snapshot of the keyboard at the time that each message was queued. For example, if the last message on the queue was WM_LBUTTONDOWN, GetKeyState reports the keyboard state at the moment when the user clicked the mouse button.
Because GetKeyState is based on your message queue, it also ignores keyboard input that was sent to another program. If the user switches to another program, any key presses that are sent to that program are ignored by GetKeyState. If you really want to know the immediate physical state of the keyboard, there is a function for that: GetAsyncKeyState. For most UI code, however, the correct function is GetKeyState.
Next
SSH keys are a way to identify trusted computers, without involving passwords. The steps below will walk you through generating an SSH key and adding the public key to the server.
Step 1: Check for SSH Keys
First, check for existing SSH keys on your computer. Open Git Bash, Cygwin, or Terminal, etc. and enter:
Check the directory listing to see if you already have a public SSH key. By default, the filenames of the public keys are one of the following:
- id_dsa.pub
- is_ecdsa.pub
- id_ed25519.pub
- id_rsa.pub
If you see an existing public and private key pair listed (for example id_rsa.pub and id_rsa) that you’d like to use, you can skip Step 2 and go straight to Step 3.
Step 2: Generate a new SSH key
Generate A Key For An Input Number
With your command line tool still open, enter the text shown below. Make sure you substitute in your email address:
You’ll be asked to enter a passphrase, or simply press Enter to not enter a passphrase:
After you enter a passphrase (or just press Enter twice), review the fingerprint, or ‘id’ of your SSH key:
Step 3: Add your key to the ssh-agent
To configure the ssh-agent program to use your SSH key, first ensure ssh-agent is enabled.
If you are using Git Bash, turn on the ssh-agent with command shown below instead:
Then, add your SSH key to the ssh-agent:
Step 4: Add your SSH key to the server
Generate A Key For An Input In Excel
To add your public SSH key to the server, you’ll copy the public SSH key you just created to the server. Substitute “username” with your username on the server, and “server.address.com” with the domain address or IP address of your server:
The server will then prompt you for your password:
Input Key On Keyboard
That’s it! You should now be set up to connect to the server without having to authenticate.