Rockwell-automation 1747-PCINT API Software for 1746 I/O Manual de usuario descargar pdf (Pagina 100)

6–46 Library of Routines OC_InitScanner

Publication 1747-6.5.3 June 1998

OC_InitScanner This function initializes the shared memory interface between the host and scanner

and this function configures the shared memory partitioning.

Syntax:

int OC_InitScanner(HANDLE handle, OCINIT *scaninit);

Parameters:

Description:

If the scanner is executing POST when this function is called, ERR_OCPOST is returned.

If the scanner has been previously initialized and the partition information in

scaninit is identical to the

current scanner partitioning, OC_InitScanner returns successfully.

If the scanner has been previously initialized and the partition information in

scaninit is different from

the current scanner partitioning, OC_InitScanner returns an error value that indicates that the scanner was

previously initialized. The scanner must be reset via OC_ResetScanner before the initialization information

can be changed. If the scanner has already been initialized, you can call OC_GetScannerInitInfo to retrieve

current partition information.

The

OCINIT structure is defined as:

typedef struct tagOCINIT

{

WORD OutputImageSize; /* size in bytes */

WORD InputImageSize; /* size in bytes */

WORD HostRetentiveDataSize; /* size in bytes */

} OCINIT;

Parameter: Description:

handle

Must be a valid handle returned from OC_OpenScanner

scaninit

Points to the structure that contains the initialization information passed

from the application

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Rockwell-automation 1747-PCINT API Software for 1746 I/O Manual de usuario Pagina 100