National Instruments CAN 372139B-01 - Manual (Page 176)

Chapter 6 Automotive Diagnostic Command Set API for C
Automotive Diagnostic Command Set User Manual 6-12 ni.com
General Functions
ndCloseDiagnostic
Purpose
Closes a diagnostic session.
Format
long ndCloseDiagnostic(
TD1 *diagRefIn);
Input
diagRefIn
Specifies the diagnostic session handle, obtained from ndOpenDiagnostic and passed
to subsequent diagnostic functions. Normally, it is not necessary to manually manipulate
the elements of this struct.
Output
Return Value
The return value indicates the function call status as a signed 32-bit integer. Zero means the
function executed successfully. A negative value specifies an error, which means the function
did not perform the expected behavior. A positive value specifies a warning, which means the
function performed as expected, but a condition arose that may require attention.
Use the ndStatusToString function to obtain a descriptive string for the return value.
Description
The diagnostic session diagRefIn specifies is closed, and you can no longer use it for
communication to an ECU. This command does not communicate the closing to the ECU
before terminating; if this is necessary, you must manually do so (for example, by calling
ndStopDiagnosticSession ) before calling ndCloseDiagnostic .