Rockwell-automation 1747-PCINT API Software for 1746 I/O Uživatelský manuál stáhnout pdf (Strana 102)

OC_OpenScanner Library of Routines 6–48

Publication 1747-6.5.3 June 1998

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);

NT int OC_OpenScanner(HANDLE *handle);

Important: The two argument values of zero are ignored by the DOS API

function.They are a carryover from the Open Controller API.

Description:

This function must be called before any of the other scanner access functions can be used.

Return Value:

Considerations:

Supported in the DOS API library and the Windows NT API library

Example:

HANDLE Handle;

int retcode;

retcode = OC_OpenScanner( &Handle, 0, 0 );

ATTENTION: After OC_OpenScanner has been called, OC_CloseScanner must be called before

exiting the application.

Name: Value: Description:

SUCCESS

scanner was opened successfully

ERR_OCOPEN

scanner is already open

ERR_OCMEM

shared memory not found

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Rockwell-automation 1747-PCINT API Software for 1746 I/O Uživatelský manuál Strana 102