Q re returning data to LV via pointer to DLL

Hello,
I have a LabView 7.0 program that calls a shared library written in C and compiled using LabWindows/CVI 7.0.
The DLL returns results to me by writing them into memory that I provide from LabView. In LabView, I wire a control to the input side of the shared library node, and I pass that value by pointer.
The DLL does not actually use the value, but rather uses the pointer to write a value that I will later need in LabView.
My question is... why do I need to connect the output side of the library node to a local variable instance of the original input control? I've found that if I don't make this connection, then I don't get the desired value written by the DLL to the specified memory location!
This seem
s very strange to me. Since the DLL is changing the value at its memory location, I would not expect to need to wire anything to the output of the shared library node. Can anyone explain this behaviour?
Thanks in advance,
Frenk

Frenk wrote:
> Hello,
>
> I have a LabView 7.0 program that calls a shared library written in C
> and compiled using LabWindows/CVI 7.0.
>
> The DLL returns results to me by writing them into memory that I
> provide from LabView. In LabView, I wire a control to the input side
> of the shared library node, and I pass that value by pointer.
>
> The DLL does not actually use the value, but rather uses the pointer
> to write a value that I will later need in LabView.
>
> My question is... why do I need to connect the output side of the
> library node to a local variable instance of the original input
> control? I've found that if I don't make this connection, then I don't
> get the desired value written by the DLL to the specified memory
> location!
Repeat wit
h me: LabVIEW is dataflow, and everything in LabVIEW is
dataflow centric.
The wire coming from the control is NOT the control itself. The wire
itself is the variable and once read from the control has no association
with that control anymore. So you pass a pointer to that array or string
to the DLL, the DLL fills in whatever it wants and then you have a new
wire on the right side of the Call Library Node containing that value.
No connection to the control at all anymore. You will have to connect
the wire coming out of the Call Library Node to an indicator (well the
local variable of the control works too, but isn't a very functional
solution) to make it visible on the frontpanel.
Rolf Kalbermatter
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

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Finding the manufacture date on an access point via software

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Hi Thomas,
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F4IF_INT_TABLE_VALUE_REQUEST not returning value with 2 decimals point

hi all,
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Hi ester,
You shud try this way. Try to use this code.
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Thomas Wesseling, UCC
### Code of employee.jsp ###
<?xml version="1.0" encoding="UTF-8"?>
<SimpleResult>
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if (choice==null && empNum==null && lastName==null &&
jobTitle==null && deptNum==null)
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<%
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<%
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%>
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<%
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%>
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%>
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Is EMPNO really a string field and not a numeric field? Your query is like
... where EMPNO='1949'
and should it perhaps be
... where EMPNO=1949
?

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Msg 7347, Level 16, State 1, Line 2
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Edited by: user10605622 on 2012/2/8 上午 8:01

user10605622 wrote:
I would like to connect the view via the OraOLEDB.Oracle' from linked server of the MSSQL and the following column couldn't be selected.
Msg 7347, Level 16, State 1, Line 2
OLE DB provider 'OraOLEDB.Oracle' for linked server 'PROD' returned data that does not match expected data length for column salary.LATEST_HIRE_DATE_STATUS'. The (maximum) expected data length is 6, while the returned data length is 4.
So I would like to change the following code from case method to decode method ? due to the view can be selected by decode method .
CASE
WHEN TRUNC (latest_hire_date) >= SYSDATE - 90
AND type_of_post = 'Temp'
THEN 'YES'
ELSE 'NO'
END
AS latest_hire_date_status,
CASE
WHEN last_day_of_duty IS NOT NULL THEN 'REJECTED'
ELSE 'PASSED'
END
AS last_day_of_duyty_status,Not quiet sure what your problem is or what you are asking for?
There's no need to use a DECODE statement when a CASE will do the same, and more, certainly if you want to check for range values rather than equality values as in your ">= SYSDATE - 90".
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Edited by: Rob Burbank on Oct 31, 2009 3:23 PM

There is no relationship between those structures....

How to view the returned data from a stored procedure in TOAD?

Hi,
I created ref cursor in the stored procedure to return data. The stored procedure works fine, just want to view the result in TOAD. The BEGIN... EXEC... END can execute the stored procedure, but how to make the result display?
Thanks!

Right click the editor and choose
"Prompt For Substitution Variables".
Run for example the following code:
DECLARE
PROCEDURE p (cur OUT sys_refcursor)
AS
BEGIN
OPEN cur FOR
SELECT *
FROM DUAL;
END p;
BEGIN
p (:cur);
END;
The result will display in Toad's Data Grid!
Regards Michael

Can not find Flush Return Data Buffer.vi

When I try to start my Labview program I get a "Error -70025 occurred at Read Home Input Status.vi" because the Return Data Buffer is not empty.
I searched for the Flush Return Data Buffer.vi in the Labview library but it is not there.
Where can I find it?

Hello Mishka,
The Flush Return Data Buffer.vi should be located in your functions palette at Vision and Motion>>73xx>>Advanced>>Flush RDB.vi. Alternatively, you can press ctrl+space on your keyboard to open the quick drop menu and then search for Flush RDB.vi.
Regards,
J_Bou

Can I return my MacBook Air past the return date?

Hi, I have a question that I've been googling but I haven't been able to find an answer to anywhere. Can I return a MacBook Air past the return date to an Apple store if it is still in shrink-wrap and I have a receipt? Thanks.

I would think you cannot return a product after the return date has passed.
Call the Apple Store and ask them.

Return data from all columns apart from a certain data type.

Bit stuck on something, hope somebody here can help:
I want to do a 'select * from ' a table, to return all columns except ones of a certain datatype. ie. I want to return data from all columns, excluding columns of datatype 'SDO_GEOMETRY'.
This gives me the list of columns:
SELECT COLUMN_NAME
FROM   USER_TAB_COLUMNS
WHERE TABLE_NAME = 'ORDER_ITEM'
AND   DATA_TYPE <> 'SDO_GEOMETRY'; But I can't seem to take it any further...
Now if I knew the columns beforehand, then of course I could just list them, excluding the geometry column, but this is to be used for a plug-in for MS Word, where a user can pick database columns to dynamically fill a report from - but I don't want the geometry columns as these can't be handled in this way.

Hi Reggie,
> connects to the database and presents a list of tables
My guess is that this macro is written so it selects from all_tab_cols.
Change that plugin and let it select from a view like the one above. That way, the users won't be able to see/pick anything that you are not able/willing to present for them.
Edit:
You could even tease your users, and let them see the columns, but not being able to pick them.
create or replace view available_tab_columns
as
   select decode(pickable.data_type, null, 0, 1) pickable
         ,atc.* -- narrow down yourself
     from all_tab_cols atc -- or maybe user_tab_cols
         ,(select 'CHAR' data_type from dual union all
           select 'DATE' from dual union all
        select 'NUMBER' from dual
           -- complete positive list, yourself
          ) pickable
    where atc.data_type = pickable.data_type(+);Regards
Peter
Message was edited by:
Peter Gjelstrup

'Driver]Parameter missing' Error while trying to pass parameter to MS query & Return Data to Microsoft Excel

I am trying to set up a parameter query using ODBC-Microsoft Query
to BMC Remedy The ODBC connection is "AR System ODBC Data Source".
I want to pass a parameter to modified date field and get all the remedy tickets for which the modified date is<= to the passed parameter date.
So in MS query, SQL-
the query looks like
WHERE ("Trouble Ticket"."Create Date">={ts '2014-10-01 00:00:00'}) AND ("Trouble Ticket"."Modified-date"<=?)
I am getting the data fetched from database in the MS query window, but unfortunately
When I click File-Return Data to Microsoft Excel, its showing an error: Driver]Parameter missing
I set the connection properties- parameter-Prompt for value using the following string.
Please help

Hi,
Based on the error message, I recommend we try the suggestion: Replace all "..." with [...]
http://www.pcreview.co.uk/forums/error-parameter-query-odbc-remedy-bmc-software-com-t3232964.html
Then, if you want to connect the Remedy's oracle database, please see the thread:
http://www.tek-tips.com/viewthread.cfm?qid=1123112
We may try the workaround: Write an Excel macro which connects to the database and fetch the data based on the SQL query.
Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.
If you have further question about write macro, I recommend you post the question to the MSDN forum for Excel
http://social.msdn.microsoft.com/Forums/en-US/home?forum=exceldev&filter=alltypes&sort=lastpostdesc
The reason why we recommend posting appropriately is you will get the most qualified pool of respondents, and other partners who read the forums regularly can either share their knowledge or learn from your interaction with us. Thank you for your understanding.
George Zhao
TechNet Community Support
It's recommended to download and install
Configuration Analyzer Tool (OffCAT), which is developed by Microsoft Support teams. Once the tool is installed, you can run it at any time to scan for hundreds of known issues in Office
programs.

Q re returning data to LV via pointer to DLL

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