CHRSAW( ) Function
Determines whether or not a character is present in the keyboard buffer.
CHRSAW([nSeconds])
Return Value
Logical
Parameters
nSeconds
Specifies the time in seconds that CHRSAW( ) waits before checking the keyboard buffer. The keyboard buffer is checked immediately if you omit nSeconds.Including nSeconds lets you use CHRSAW( ) 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.
Remarks
CHRSAW( ) returns True (.T.) if a character is present in the keyboard buffer, and False (.F.) if not. CHRSAW( ) doesn't affect the keyboard buffer contents.
Example
In the following example, the system displays a window containing input fields created with @ ... GET commands, and waits 5 seconds for keyboard input. If a key isn't pressed in this time period, CHRSAW( ) returns False (.F.) and the program terminates.
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