ASCII Constants
As of release 12.0, VTScada has full support for Unicode (UTF-8). ASCII constants remain supported for legacy purposes.
The following constants are defined at the \System layer. In code that parses user-input strings, you should use these constants rather than creating your own buffers for common key values or key combinations.
| Name of Constant | Contents | Description |
|---|---|---|
| CR | MakeBuff(1, 13) | Carriage return |
| ESC | MakeBuff(1, 27) | Escape key |
| LF | MakeBuff(1, 10) | Line feed |
| NULL | MakeBuff(1, 0) | Null byte |
| TAB | MakeBuff(1, 9) | Tab key |
| CRLF | Concat(MakeBuff(1, 13), MakeBuff(1, 10)) | CR/LF pair |
| UpArrow | Concat(MakeBuff(1, 253), MakeBuff(1, 0x48)) | Up arrow key |
| DownArrow | Concat(MakeBuff(1, 253), MakeBuff(1, 0x50)) | Down arrow key |
| LeftArrow | Concat(MakeBuff(1, 253), MakeBuff(1, 0x4B)) | Left arrow key |
| RightArrow | Concat(MakeBuff(1, 253), MakeBuff(1, 0x4D)) | Right arrow key |
| AltLeftArrow | Concat(MakeBuff(1, 253), MakeBuff(1, 0x9B)) | Alt and left arrow |
| AltRightArrow | Concat(MakeBuff(1, 253), MakeBuff(1, 0x9D)) | Alt and right arrow |
| SUpArrow | Concat(MakeBuff(1, 253), MakeBuff(1, 0xB8)) | Shift and up arrow |
| SDownArrow | Concat(MakeBuff(1, 253), MakeBuff(1, 0xC0)) | Shift and down arrow |
| PageUp | Concat(MakeBuff(1, 253), MakeBuff(1, 0x49)) | Page up key |
| PageDown | Concat(MakeBuff(1, 253), MakeBuff(1, 0x51)) | Page down key |
| HomeKey | Concat(MakeBuff(1, 253), MakeBuff(1, 0x47)) | Home key |
| EndKey | Concat(MakeBuff(1, 253), MakeBuff(1, 0x4F)) | End key |
| DeleteKey | Concat(MakeBuff(1, 253), MakeBuff(1, 0x53)) | Delete key |
| SPageUp | Concat(MakeBuff(1, 253), MakeBuff(1, 0xB9)) | Shift and page up |
| SPageDown | Concat(MakeBuff(1, 253), MakeBuff(1, 0xC1)) | Shift and page down |
| SHomeKey | Concat(MakeBuff(1, 253), MakeBuff(1, 0xB7)) | Shift and home |
| SEndKey | Concat(MakeBuff(1, 253), MakeBuff(1, 0xBF)) | Shift and end |
| CtrlPageUp | Concat(MakeBuff(1, 253), MakeBuff(1, 0x84)) | Ctrl and page up |
| CtrlPageDown | Concat(MakeBuff(1, 253), MakeBuff(1, 0x76)) | Ctrl and page down |
| CtrlHome | Concat(MakeBuff(1, 253), MakeBuff(1, 0x77)) | Ctrl and home |
| CtrlEnd | Concat(MakeBuff(1, 253), MakeBuff(1, 0x75)) | Ctrl and end |
| CtrlBKey | MakeBuff(1, 2) | Ctrl and B |
| CtrlCKey | MakeBuff(1, 3) | Ctrl and C |
| CtrlDKey | MakeBuff(1, 4) | Ctrl and D |
| CtrlIKey | Concat(MakeBuff(1, 253), MakeBuff(1, 0xB5)) | Ctrl and I |
| CtrlLKey | MakeBuff(1, 12) | Ctrl and L |
| CtrlNKey | MakeBuff(1, 14) | Ctrl and N |
| CtrlOKey | MakeBuff(1, 15) | Ctrl and O |
| CtrlUKey | MakeBuff(1, 21) | Ctrl and U |
| CtrlVKey | MakeBuff(1, 22) | Ctrl and V |
| CtrlXKey | MakeBuff(1, 24) | Ctrl and X |
| CtrlYKey | MakeBuff(1, 25) | Ctrl and Y |
| CtrlZKey | MakeBuff(1, 26) | Ctrl and Z |
