Rockwell-automation 1747-PCIS API Software - Open Controller Uživatelský manuál stáhnout pdf (Strana 107)

Publication 1747-UM002A-US-P - June 2000

Library of Routines 6-47

Return Value:

Considerations:

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

Example:

HANDLE Handle;

BYTE retent_data[500];

int retcode;

retcode = OC_ReadHostRetentiveData( Handle, retent_data,

0, 500 );

OC_ReadInputImage

OC_ReadInputImage reads the current input image from the scanner.

Syntax:

int OC_ReadInputImage(HANDLE handle,

WORD *inpimgcpy, int slotnum, WORD offset,

WORD len, WORD *imagebuf);

Parameters:

Name: Value: Description:

SUCCESS 0 host retentive data was written successfully

ERR_OCACCESS 2

handle does not have access to scanner

ERR_OCINIT 5 scanner has not been initialized, see OC_InitScanner

ERR_OCPARAM 8 parameter contains invalid value

Parameter: Description:

handle Must be a valid handle returned from OC_OpenScanner

inpimgcpy If

inpimgcpy

is:

NULL OC_ReadInputImage reads data directly from

the input image in the scanner’s shared

memory.

not NULL OC_ReadInputImage reads data from

inpimgcpy which contains a copy of the

scanner’s input image.

slotnum

offset

len

slotnum is:

positive input data for that slot is read into the array

pointed to by

imagebuf. Then imagebuf

contains len words of input data starting at

word

offset of the module in the slot. Data

will not be read past the end of the input image

for the slot.

-1 the entire input image is read into the array

pointed to by

imagebuf

and offset and

len are ignored.

imagebuf Must point to an array that is large enough to accept the amount of

data in the requested input image

1 2 ... 102 103 104 105 106 107 108 109 110 111 112 ... 173 174

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