Virtual Key Codes |
Symbolic constant names, hexadecimal values, and keyboard equivalents for the virtual key codes used by Windows. |
Windows defines special constants for each key the user can press. The virtual-key codes identify various virtual keys. These constants can then be used to refer to the keystroke when using Delphi and Windows API calls or in an OnKeyUp or OnKeyDown event handler. Virtual keys mainly consist of actual keyboard keys, but also include "virtual" elements such as the three mouse buttons. Delphi defines all constants for Windows virtual key codes in the Windows unit.
Here are some of the Delphi articles that deal with the keyboard and VK codes:
· Keyboard Symphony
Delphi For Beginners: Get familiar with the OnKeyDown, OnKeyUp, and onKeyPress event procedures to respond to various key actions or handle and process ASCII characters along with other special purpose keys.
· How to Translate a Virtual Key Code to a Character
Windows defines special constants for each key the user can press. The virtual-key codes identify various virtual keys. In Delphi, the OnKeyDown and OnKeyUp events provide the lowest level of keyboard response. To use OnKeyDown or OnKeyUp to test for keys the user presses, you must use Virtual key codes to get the key pressed. Here's how to translate the virtual key code to the corresponding Windows character.
· Touch Me - I'm Untouchable
Intercepting keyboard input for controls that cannot receive the input focus. Working with keyboard hooks from Delphi.
· ENTERing TAB
Using the Enter key like a Tab key with Delphi controls.
· Abort a Loop by Pressing a Key
Use the VK_ESCAPE to abort a (for) loop.
· Use Arrow Keys to Move Between Controls
The UP and DOWN arrow keys are virtually useless in edit controls. So why not use them for navigating between fields.
· Shift, Ctrl, Alt Key Checking
Using virtual key codes to check the key state.
· Simulating keystrokes from code
A handy function to simulate the pressing of keyboard keys.
The following table shows the symbolic constant names, hexadecimal values, and keyboard equivalents for the virtual-key codes used by Windows. Some Windows 2000 and OEM specific constants are missing, the entire list is available from Microsoft. The codes are listed in numerical order.
Symbolic constant name | Value (hexadecimal) | Keyboard (or mouse) equivalent |
---|---|---|
VK_LBUTTON | 01 | Left mouse button |
VK_RBUTTON | 02 | Right mouse button |
VK_CANCEL | 03 | Control-break processing |
VK_MBUTTON | 04 | Middle mouse button (three-button mouse) |
VK_BACK | 08 | BACKSPACE key |
VK_TAB | 09 | TAB key |
VK_CLEAR | 0C | CLEAR key |
VK_RETURN | 0D | ENTER key |
VK_SHIFT | 10 | SHIFT key |
VK_CONTROL | 11 | CTRL key |
VK_MENU | 12 | ALT key |
VK_PAUSE | 13 | PAUSE key |
VK_CAPITAL | 14 | CAPS LOCK key |
VK_ESCAPE | 1B | ESC key |
VK_SPACE | 20 | SPACEBAR |
VK_PRIOR | 21 | PAGE UP key |
VK_NEXT | 22 | PAGE DOWN key |
VK_END | 23 | END key |
VK_HOME | 24 | HOME key |
VK_LEFT | 25 | LEFT ARROW key |
VK_UP | 26 | UP ARROW key |
VK_RIGHT | 27 | RIGHT ARROW key |
VK_DOWN | 28 | DOWN ARROW key |
VK_SELECT | 29 | SELECT key |
VK_PRINT | 2A | PRINT key |
VK_EXECUTE | 2B | EXECUTE key |
VK_SNAPSHOT | 2C | PRINT SCREEN key |
VK_INSERT | 2D | INS key |
VK_DELETE | 2E | DEL key |
VK_HELP | 2F | HELP key |
| 30 | 0 key |
| 31 | 1 key |
| 32 | 2 key |
| 33 | 3 key |
| 34 | 4 key |
| 35 | 5 key |
| 36 | 6 key |
| 37 | 7 key |
| 38 | 8 key |
| 39 | 9 key |
| 41 | A key |
| 42 | B key |
| 43 | C key |
| 44 | D key |
| 45 | E key |
| 46 | F key |
| 47 | G key |
| 48 | H key |
| 49 | I key |
| 4A | J key |
| 4B | K key |
| 4C | L key |
| 4D | M key |
| 4E | N key |
| 4F | O key |
| 50 | P key |
| 51 | Q key |
| 52 | R key |
| 53 | S key |
| 54 | T key |
| 55 | U key |
| 56 | V key |
| 57 | W key |
| 58 | X key |
| 59 | Y key |
| 5A | Z key |
VK_NUMPAD0 | 60 | Numeric keypad 0 key |
VK_NUMPAD1 | 61 | Numeric keypad 1 key |
VK_NUMPAD2 | 62 | Numeric keypad 2 key |
VK_NUMPAD3 | 63 | Numeric keypad 3 key |
VK_NUMPAD4 | 64 | Numeric keypad 4 key |
VK_NUMPAD5 | 65 | Numeric keypad 5 key |
VK_NUMPAD6 | 66 | Numeric keypad 6 key |
VK_NUMPAD7 | 67 | Numeric keypad 7 key |
VK_NUMPAD8 | 68 | Numeric keypad 8 key |
VK_NUMPAD9 | 69 | Numeric keypad 9 key |
VK_SEPARATOR | 6C | Separator key |
VK_SUBTRACT | 6D | Subtract key |
VK_DECIMAL | 6E | Decimal key |
VK_DIVIDE | 6F | Divide key |
VK_F1 | 70 | F1 key |
VK_F2 | 71 | F2 key |
VK_F3 | 72 | F3 key |
VK_F4 | 73 | F4 key |
VK_F5 | 74 | F5 key |
VK_F6 | 75 | F6 key |
VK_F7 | 76 | F7 key |
VK_F8 | 77 | F8 key |
VK_F9 | 78 | F9 key |
VK_F10 | 79 | F10 key |
VK_F11 | 7A | F11 key |
VK_F12 | 7B | F12 key |
VK_F13 | 7C | F13 key |
VK_F14 | 7D | F14 key |
VK_F15 | 7E | F15 key |
VK_F16 | 7F | F16 key |
VK_F17 | 80H | F17 key |
VK_F18 | 81H | F18 key |
VK_F19 | 82H | F19 key |
VK_F20 | 83H | F20 key |
VK_F21 | 84H | F21 key |
VK_F22 | 85H | F22 key |
VK_F23 | 86H | F23 key |
VK_F24 | 87H | F24 key |
VK_NUMLOCK | 90 | NUM LOCK key |
VK_SCROLL | 91 | SCROLL LOCK key |
VK_LSHIFT | A0 | Left SHIFT key |
VK_RSHIFT | A1 | Right SHIFT key |
VK_LCONTROL | A2 | Left CONTROL key |
VK_RCONTROL | A3 | Right CONTROL key |
VK_LMENU | A4 | Left MENU key |
VK_RMENU | A5 | Right MENU key |
VK_PLAY | FA | Play key |
VK_ZOOM | FB | Zoom key |
http://delphi.about.com/od/objectpascalide/l/blvkc.htm
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