 OpenAduDevice
This functions searches for any ADU device attached to the computer. The function opens
the first ADU device that it encounters and passes back a handle to it.
The handle value must be retained by the calling program and used with all subsequent
ReadAduDevice, WriteAduDevice and CloseAduDevice 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 is connected to the personal computer then use
OpenAduDeviceByProductId or OpenAduDeviceBySerialNumber instead of OpenAduDevice.
C Declaration:
void * __stdcall OpenAduDevice(unsigned long iTimeout);
Visual Basic Declaration:
Declare Function OpenAduDevice Lib "AduHid.DLL" _
(ByVal iTimeout As Long) As Long
Arguments:
| Argument |
Type |
Value |
Description |
| 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 ReadAduDevice and WriteAduDevice function calls.
Return Codes:
| Value |
Description |
| INVALID_HANDLE_VALUE |
device was not opened |
| 0 |
device was not opened |
| other |
Handle to the ADU device |
|
