 OpenAdu232ByProductId
This functions searches for any ADU device attached to the computer that matches the
product id. The function opens the first ADU device that matches and passes back a handle
to it.
The handle value must be retained by the calling program and used with all subsequent
ReadAdu232, WriteAdu232 and CloseAdu232 function calls.
Note that "first" in this context does not necessarily reflect the order that
the devices were plugged in. "First" means the first one encountered in the
internal list maintained by the Windows operating system.
If more than 1 ADU device with the same product id is connected then use
OpenAdu232BySerialNumber instead of OpenAdu232ByProductId.
C Declaration:
void * __stdcall OpenAdu232ByProductId(int iProductId,
unsigned long iTimeout);
Visual Basic Declaration:
Declare Function OpenAdu232ByProductId Lib "AduHid.DLL" _
(ByVal iProductId As Long, _
ByVal iTimeout As Long) As Long
Arguments:
| Argument |
Type |
Value |
Description |
| iProductId |
integer |
non 0 |
product id to search for |
| iTimeout |
unsigned long |
0 |
timeouts disabled |
| other |
timeout processing enabled |
Any non-zero iTimeout value will enable timeout handling. The actual timeout period is
passed into the ReadAdu232 and WriteAdu232 function calls.
Return Codes:
| Value |
Description |
| INVALID_HANDLE_VALUE |
device was not opened |
| 0 |
device was not opened |
| other |
Handle to the ADU device |
|