Personal488 User's Manual For Windows 95 and Windows NT
API Command Reference 67
FindListeners
Syntax
INT WINAPI FindListeners(DevHandleT devHandle, BYTE primary,
LPWORD listener, DWORD limit);
devHandle
refers to either an IEEE 488 interface or an external device. If
devHandle
refers to an external device, then the
FindListeners
command acts on the
hardware interface to which the external device is attached.
primary
is the primary IEEE 488 bus address to check.
listener
is a pointer to a list that contains all Listeners found on the specified interface
board. You must allocate enough memory to accommodate all of the possible Listeners
up to the limit that he specified.
limit
is the maximum number of Listeners to be entered into the Listener list.
Returns
-1
if error
otherwise, the number of Listeners found on the interface
Mode
Any
Bus States
ATN
••
MTA, UNL, LAG
Example
WORD listeners[5];
errorcode = FindListeners(ieee,10,listeners,5);
See Also
CheckListener, BusAddress, Status
The
FindListeners
command finds all of the devices configured to Listen at the specified primary
address on the IEEE 488 bus. The command first identifies the primary address to check and returns
the number of Listeners found and their addresses. Then, it fills the user-supplied array with the
addresses of the Listeners found. The number of Listeners found is the value returned by the function.
The returned values include the secondary address in the upper byte, and the primary address in the
lower byte. If there is no secondary address, then the upper byte is set to
255
; hence, a device with
only a primary address of
16
and no secondary address is represented as
0xFF10
or
-240
decimal.
Summary of Contents for OMB-PER-488/W95
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