Rockwell-automation 1747-PCIS API Software - Open Controller Uživatelský manuál stáhnout pdf (Strana 113)

Publication 1747-UM002A-US-P - June 2000

Library of Routines 6-53

the offset within the memroy to begin reading. length specifiies the

number of bytes to be read.

offset

length

points past the end of the memory, no bytes

will be written and ERR_OCPRAM will be returned.

Return Value:

Considerations:

Supported in the Windows NT API library only.

Example:

Byte buf[100] / * buffer of 100 bytes of important

data * /

HANDLE handle;

Word crc, crc_saved;

/* Read 100 bytes of data from offset 0 in SRAM */

OC_ReadSRAM(handle, buf, 0, 100);

/* Calculate CRC */

OC_CalculateCRC(buf, 100, &crc);

/* Read saved CRC at offset 100 in SRAM */

OC_ReadSRAM(handle, &crc_saved, 100, 2);

/* Check CRC */

if (crc != saved_crc)

printf(“ERROR: Data is corrupted.\n”);

Name: Description:

SUCCESS data was read successfully

ERR_OCACCESS

handle does not have access to scanner

ERR_OCPARAM offset+length points past the end of the memory

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Rockwell-automation 1747-PCIS API Software - Open Controller Uživatelský manuál Strana 113