Rockwell Automation 1747-PCIS API Software - Open Controller - Manual (Page 101)

Publication 1747-UM002A-US-P - June 2000
Library of Routines 6-41
scaninit.InputImageSize = 128; / * 64 words for input image */
scaninit.OutputImageSize = 128; / * 64 words for output image
*/
scaninit.HostRetentiveDataSize = 500; / * 256 words for host
data area */
retcode = OC_InitScanner( Handle, &scaninit );
OC_OpenScanner OC_OpenScanner acquires access to the scanner device and sets a
unique ID that the application uses to access the scanner in
subsequent functions.
Syntax:
DOS int OC_OpenScanner(HANDLE *handle, 0, 0);
(OCE only) int OC_OpenScanner(HANDLE*handle,
WORD segaddr, BYTE irqnum)
NT int OC_OpenScanner(HANDLE *handle);
Description:
This function must be called before any of the other scanner access
functions can be used.
segaddr defines the segment address of the scanner’s shared memory
in the host processor’s memory map. segaddr must contain one of the
segment addresses in Table 2. Otherwise, the scanner cannot be
opened.
IMPORTANT
The two argument values of zero are ignored by the
DOS API function. They are a carryover from the
Open Controller API.
ATTENTION
!
After OC_OpenScanner has been called,
OC_CloseScanner must be called before exiting the
application.