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Determines whether or not a character is present in the keyboard buffer.
CHRSAW([nSeconds]) |
Parameters
- nSeconds
- Specifies the time in seconds that CHRSAW(В ) waits before checking the keyboard buffer. The keyboard buffer is checked immediately if you omit nSeconds. Including nSeconds lets you use CHRSAW(В ) for a variety of timed activities. For example, your program can close an application if a key hasn't been pressed for a specific number of seconds.
Return Value
Logical
Remarks
CHRSAW(В ) returns True (.T.) if a character is present in the keyboard buffer, and False (.F.) if not. CHRSAW(В ) doesn't affect the keyboard buffer contents.
Example
In the following example, the system displays a window containing input fields created with @В ...В GET commands, and waits 5 seconds for keyboard input. If a key isn't pressed in this time period, CHRSAW(В ) returns False (.F.) and the program terminates.
| В |  Copy Code |
|---|---|
SET TALK OFF DEFINE WINDOW wEnter FROM 7,10 to 13,70 PANEL ACTIVATE WINDOW wEnter @ 1,3 SAY 'Customer: ' GET gcCustomer DEFAULT SPACE(40) @ 3,3 SAY 'Address: ' GET gcAddress DEFAULT SPACE(40) WAIT WINDOW 'Waiting for input' NOWAIT IF NOT CHRSAW(5) DEACTIVATE WINDOW wEnter CLEAR GETS ELSE READ DEACTIVATE WINDOW wEnter ENDIF RELEASE WINDOW wEnter WAIT CLEAR | |