Paxar Gold 6037EX, Руководство программиста

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4-48 Programmer’s Manual
s c n G e t c h
Description
Retrieves a character from the scanner buffer without echoing it
to the display. If the scanner buffer is empty, this function
activates the scanner to let the operator scan another bar code.
This function works with each scanner.
This function tracks the characters in the bar code internally.
For example, after a scan, a call to scnGetch reads the first
character. Subsequent calls to scnGetch read the subsequent
characters in the bar code. For example, the second call reads
the second character, the third call reads the third character,
etc.
Use scnGetche to retrieve characters and echo them to the
display.
Syntax
short far scnGetch(void);
Parameters
None
Return Values
0-255
The retrieved character.
-2
Decoding fault. The scanner scanned the bar code, but the
printer could not decode it.
-4
Checksum error.
-9
Scanner is disabled.
-10
Time-out error.