error checking using ncWaitForState

[Slytherin]

I am using Status = ncWaitForState(Objh, NC_FRMTYPE_COMM_ERR, 100, 0); to check for my USB CAN transmit connection. If I am to use ncCreateNotification to do data polling for callback, what other method can I use to do error checking?

[John E]

According to Page 534 of the NI-CAN Hardware and Software Manual.pdf on page

ncCreateNotification - Return Value
Status of the function call, returned as a signed 32-bit integer. Zero means the function executed successfully. Negative specifies an error, meaning the function did not perform expected behavior. Positive specifies a warning, meaning the function performed as expected, but a condition arose that might require attention. For more information, refer to ncStatusToString.

Thus if Status is an integer then you can just assign ncCreateNotification's return value to Status.  If Status is a string then you can use ncStatusToString.


As a Side note, also on page 534 there is the warning:
The ncCreateNotification function is not supported by the 847x and 847x with Sync series CAN and LIN interfaces.


Regards,