ADU  Series - USB Data Acquisition Interface SDK 

OpenAduStream

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 ReadAduStream and CloseAduStream 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 computer then use OpenAduStreamByProductId or OpenAduStreamBySerialNumber instead of OpenAduStream.

C Declaration:

void * __stdcall OpenAduStream(unsigned long iTimeout);

Visual Basic Declaration:

Declare Function OpenAduStream 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 ReadAduStream function call.

Return Codes:

Value Description
INVALID_HANDLE_VALUE pipe was not opened
0 pipe was not opened
other Handle to the ADU stream pipe