LJM Error # 2607 STREAM_CHN_LIST_INVALID | LabJack
 

LJM Error # 2607 STREAM_CHN_LIST_INVALID

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eric11
eric11's picture
LJM Error # 2607 STREAM_CHN_LIST_INVALID

I'm using VB6 and attempting input streaming using the LJM stream functions:

https://labjack.com/support/software/api/ljm/function-reference/stream-f...

In the example VB code (VBA_LJM_2014_07_28.zip), the definition for LJM_eStreamStart is:

 

Declare Function LJM_eStreamStart Lib "labjackm.dll" (ByVal Handle As Long, ByVal ScansPerRead As Long, ByVal NumAddresses As Long, ByRef aScanList As Long, ByRef ScanRate As Double) As Long
 

Shouldn't aScanList be "ByRef ScanRate() As Double"?

If I made that change and then ran the following (trying to scan AIN0):

 

    Dim lngHandle As Long
    Dim ScansPerRead As Long
    Dim aScanList(2) As Long
    Dim ScanRate As Double
    Dim NumAddresses As Long

    ScanRate = 50000
    ScansPerRead = 2
    
    NumAddresses = 1
    aScanList(0) = 0

    lngError = LJM_eStreamStart(lngHandle, ScansPerRead, NumAddresses, aScanList, ScanRate)
    If lngError <> LJME_NOERROR Then
        Erase aScanList
        Err.Raise lngError + 50000 'Adding 50000 makes sure Labjack errors are recognized by VB as "user-defined"
    End If

 

I'm getting an error: 

LJM Error # 2607 STREAM_CHN_LIST_INVALID

 

Any ideas?

 

 

 

 

LabJack Support
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"ByRef aScanList As Long" is

"ByRef aScanList As Long" is correct when using a dll declare and passing an array. You need to pass the first element of aScanList when calling LJM_eStreamStart. So something like:

lngError = LJM_eStreamStart(lngHandle, ScansPerRead, NumAddresses, aScanList(0), ScanRate)

The VBA code in the LJM_VBA_SimpleStream.xls demonstrates using the stream functions. I'm attaching that code in case you don't have Xcel. Unzip for the text file with the code. Besides the Excel cell based code, the VBA code is VB6 compatible.

eric11
eric11's picture
That solved my stream in

That solved my stream in issues.

 

Thanks!

Eric