The only input function defined and documented thus far is GETKEY.
GETKEY(X {,xltname})
This function inputs and returns the ASCII decimal value of a single character. The parameter X must be one of the following:
Value |
Description |
|---|---|
0 |
Don't wait for input. If no characters are available, returns -1. This is similar to XCALL TINKEY. |
-1 |
Wait until a character is entered. This is similar to Xcall ACCEPT. |
-2 |
Check if a character is available, but don't input it. Returns -1 if no character is available. (Some versions have returned 0 to indicate that a character is available, and others have returned the actual character value. For maximum compatibility, you should treat anything other than -1 as indicating that a character is available, but then input it using one of the other modes to determine its actual value.) |
The optional xltname argument may be used to specify a function key translation table to process the character through if it is a function key.
Note that the return value of 999 indicates an invalid value of X. A common mistake is to use 1 or 2 instead of -1 or -2.
