Convert String to Keyevents

Convert String to KeyEvents

I'm basically using a glorified switch statement. Simple and fast:

import static java.awt.event.KeyEvent.*;

public class Keyboard {

    private Robot robot;

    public static void main(String... args) throws Exception {
        Keyboard keyboard = new Keyboard();
        keyboard.type("Hello there, how are you?");
    }

    public Keyboard() throws AWTException {
        this.robot = new Robot();
    }

    public Keyboard(Robot robot) {
        this.robot = robot;
    }

    public void type(CharSequence characters) {
        int length = characters.length();
        for (int i = 0; i < length; i++) {
            char character = characters.charAt(i);
            type(character);
        }
    }

    public void type(char character) {
        switch (character) {
        case 'a': doType(VK_A); break;
        case 'b': doType(VK_B); break;
        case 'c': doType(VK_C); break;
        case 'd': doType(VK_D); break;
        case 'e': doType(VK_E); break;
        case 'f': doType(VK_F); break;
        case 'g': doType(VK_G); break;
        case 'h': doType(VK_H); break;
        case 'i': doType(VK_I); break;
        case 'j': doType(VK_J); break;
        case 'k': doType(VK_K); break;
        case 'l': doType(VK_L); break;
        case 'm': doType(VK_M); break;
        case 'n': doType(VK_N); break;
        case 'o': doType(VK_O); break;
        case 'p': doType(VK_P); break;
        case 'q': doType(VK_Q); break;
        case 'r': doType(VK_R); break;
        case 's': doType(VK_S); break;
        case 't': doType(VK_T); break;
        case 'u': doType(VK_U); break;
        case 'v': doType(VK_V); break;
        case 'w': doType(VK_W); break;
        case 'x': doType(VK_X); break;
        case 'y': doType(VK_Y); break;
        case 'z': doType(VK_Z); break;
        case 'A': doType(VK_SHIFT, VK_A); break;
        case 'B': doType(VK_SHIFT, VK_B); break;
        case 'C': doType(VK_SHIFT, VK_C); break;
        case 'D': doType(VK_SHIFT, VK_D); break;
        case 'E': doType(VK_SHIFT, VK_E); break;
        case 'F': doType(VK_SHIFT, VK_F); break;
        case 'G': doType(VK_SHIFT, VK_G); break;
        case 'H': doType(VK_SHIFT, VK_H); break;
        case 'I': doType(VK_SHIFT, VK_I); break;
        case 'J': doType(VK_SHIFT, VK_J); break;
        case 'K': doType(VK_SHIFT, VK_K); break;
        case 'L': doType(VK_SHIFT, VK_L); break;
        case 'M': doType(VK_SHIFT, VK_M); break;
        case 'N': doType(VK_SHIFT, VK_N); break;
        case 'O': doType(VK_SHIFT, VK_O); break;
        case 'P': doType(VK_SHIFT, VK_P); break;
        case 'Q': doType(VK_SHIFT, VK_Q); break;
        case 'R': doType(VK_SHIFT, VK_R); break;
        case 'S': doType(VK_SHIFT, VK_S); break;
        case 'T': doType(VK_SHIFT, VK_T); break;
        case 'U': doType(VK_SHIFT, VK_U); break;
        case 'V': doType(VK_SHIFT, VK_V); break;
        case 'W': doType(VK_SHIFT, VK_W); break;
        case 'X': doType(VK_SHIFT, VK_X); break;
        case 'Y': doType(VK_SHIFT, VK_Y); break;
        case 'Z': doType(VK_SHIFT, VK_Z); break;
        case '`': doType(VK_BACK_QUOTE); break;
        case '0': doType(VK_0); break;
        case '1': doType(VK_1); break;
        case '2': doType(VK_2); break;
        case '3': doType(VK_3); break;
        case '4': doType(VK_4); break;
        case '5': doType(VK_5); break;
        case '6': doType(VK_6); break;
        case '7': doType(VK_7); break;
        case '8': doType(VK_8); break;
        case '9': doType(VK_9); break;
        case '-': doType(VK_MINUS); break;
        case '=': doType(VK_EQUALS); break;
        case '~': doType(VK_SHIFT, VK_BACK_QUOTE); break;
        case '!': doType(VK_EXCLAMATION_MARK); break;
        case '@': doType(VK_AT); break;
        case '#': doType(VK_NUMBER_SIGN); break;
        case '$': doType(VK_DOLLAR); break;
        case '%': doType(VK_SHIFT, VK_5); break;
        case '^': doType(VK_CIRCUMFLEX); break;
        case '&': doType(VK_AMPERSAND); break;
        case '*': doType(VK_ASTERISK); break;
        case '(': doType(VK_LEFT_PARENTHESIS); break;
        case ')': doType(VK_RIGHT_PARENTHESIS); break;
        case '_': doType(VK_UNDERSCORE); break;
        case '+': doType(VK_PLUS); break;
        case '\t': doType(VK_TAB); break;
        case '\n': doType(VK_ENTER); break;
        case '[': doType(VK_OPEN_BRACKET); break;
        case ']': doType(VK_CLOSE_BRACKET); break;
        case '\\': doType(VK_BACK_SLASH); break;
        case '{': doType(VK_SHIFT, VK_OPEN_BRACKET); break;
        case '}': doType(VK_SHIFT, VK_CLOSE_BRACKET); break;
        case '|': doType(VK_SHIFT, VK_BACK_SLASH); break;
        case ';': doType(VK_SEMICOLON); break;
        case ':': doType(VK_COLON); break;
        case '\'': doType(VK_QUOTE); break;
        case '"': doType(VK_QUOTEDBL); break;
        case ',': doType(VK_COMMA); break;
        case '<': doType(VK_SHIFT, VK_COMMA); break;
        case '.': doType(VK_PERIOD); break;
        case '>': doType(VK_SHIFT, VK_PERIOD); break;
        case '/': doType(VK_SLASH); break;
        case '?': doType(VK_SHIFT, VK_SLASH); break;
        case ' ': doType(VK_SPACE); break;
        default:
            throw new IllegalArgumentException("Cannot type character " + character);
        }
    }

    private void doType(int... keyCodes) {
        doType(keyCodes, 0, keyCodes.length);
    }

    private void doType(int[] keyCodes, int offset, int length) {
        if (length == 0) {
            return;
        }

        robot.keyPress(keyCodes[offset]);
        doType(keyCodes, offset + 1, length - 1);
        robot.keyRelease(keyCodes[offset]);
    }

}

If you want some custom key typing, you can extend the class and override the type(char) method. For example:

import static java.awt.event.KeyEvent.*;

public class WindowUnicodeKeyboard extends Keyboard {

    private Robot robot;

    public WindowUnicodeKeyboard(Robot robot) {
        super(robot);
        this.robot = robot;
    }

    @Override
    public void type(char character) {
        try {
            super.type(character);
        } catch (IllegalArgumentException e) {
            String unicodeDigits = String.valueOf(Character.getCodePoint(character));
            robot.keyPress(VK_ALT);
            for (int i = 0; i < unicodeDigits.length(); i++) {
                typeNumPad(Integer.parseInt(unicodeDigits.substring(i, i + 1)));
            }
            robot.keyRelease(VK_ALT);
        }
    }

    private void typeNumPad(int digit) {
        switch (digit) {
        case 0: doType(VK_NUMPAD0); break;
        case 1: doType(VK_NUMPAD1); break;
        case 2: doType(VK_NUMPAD2); break;
        case 3: doType(VK_NUMPAD3); break;
        case 4: doType(VK_NUMPAD4); break;
        case 5: doType(VK_NUMPAD5); break;
        case 6: doType(VK_NUMPAD6); break;
        case 7: doType(VK_NUMPAD7); break;
        case 8: doType(VK_NUMPAD8); break;
        case 9: doType(VK_NUMPAD9); break;
        }
    }

}

There is, of course, room for improvement, but you get the idea.

Java: Convert string to KeyEvent virtual key code?

if (key.matches("[^1-9A-Z]"))
  throw new IllegalArgumentException("...");

---

Convertion can be done using (int) key.charAt(0) value, because:

public static final int VK_0 48 
public static final int VK_1 49 
...
public static final int VK_9 57 
public static final int VK_A 65 
...

Converting a Char into Java KeyEvent KeyCode

You could work something out with this:

KeyStroke ks = KeyStroke.getKeyStroke('k', 0);
System.out.println(ks.getKeyCode());

or just use this:

private void writeString(String s) {
    for (int i = 0; i < s.length(); i++) {
        char c = s.charAt(i);
        if (Character.isUpperCase(c)) {
            robot.keyPress(KeyEvent.VK_SHIFT);
        }
        robot.keyPress(Character.toUpperCase(c));
        robot.keyRelease(Character.toUpperCase(c));

        if (Character.isUpperCase(c)) {
            robot.keyRelease(KeyEvent.VK_SHIFT);
        }
    }
    robot.delay(delay);
}

Convert a list of KeyEvent objects to a string

After much research, this is what I came up with. I used a KeyListener which accepts key events. It then appends to an Editable based on the key events (considers shifts, etc). The code below will simply echo the growing String as the key events come in.

KeyListener tkl = new TextKeyListener(Capitalize.NONE, false);
Editable et = Editable.Factory.getInstance().newEditable("");

View.OnKeyListener key = new View.OnKeyListener() {
    @Override
    public boolean onKey(View v, int keyCode, KeyEvent event) {
        if (event.getAction() == KeyEvent.ACTION_DOWN)
            tkl.onKeyDown(null, et, keyCode, event);
        else if (event.getAction() == KeyEvent.ACTION_UP)
            tkl.onKeyUp(null, et, keyCode, event);
        else
            tkl.onKeyOther(null, et, event); //NOTE: My devices never used KeyEvent.ACTION_MULTIPLE so I don't know if it should get fired here or with the key down event.

        Log.i(("Test: " + et.toString());
    }
};

@Override
public boolean dispatchKeyEvent(KeyEvent event) {
    if (key.onKey(null, event.getKeyCode(), event))
        return true;
    else
        return super.dispatchKeyEvent(event);
}

Convert string to pygame.key

You can use ord(c) to get the ordinary number, that represents a character. e.g:

ch = 'a'

while True:

    for event in pygame.event.get():
        if event.type == pygame.KEYDOWN:

            if event.key == ord(ch):
                # [...]

But note, if event.unicode == ch:, would do the same.

Java converting keycode to string or char

Cast it to Char.

Char c=(Char)keycode;

---

Related Topics