Check for empty visa resource?

When I am developing the VI at my desk and not a the test station PC, the VISA resource name is empty.
Once the VI is moved to the test station PC, the user can select a VXI board.
How do I make sure the user has selected a VISA resource before continuing?
I can wire a Comparision to check for Empty String, and that works. But is there any method that I should use?
Solved!
Go to Solution.

Additionally, you can limit the selectable items by interface type. Right-click VISA Resource Name Control and select I/O Name Filtering.
National Instruments
Product Support Engineer

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Check for empty session variable

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Login reads the database info:
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Message was edited by:
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Your test for null will always fail, because request.getParameter("username") is NEVER null, in that it exists, even though it contains no data.
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Check for empty table row before adding date

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Hi,
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Need help understanding whats wrong with ASP checking for empty fields.

Can anyone tell me whats wrong with these if statements: If i
sumbit the
form providing everything except the dream_inscript field it
gives me this
error:
=================================================
Microsoft OLE DB Provider for ODBC Drivers error '80040e57'
[Microsoft][ODBC Microsoft Access Driver]Invalid string or
buffer length
/purch_confirm_mail.asp, line 67
=================================================
If i submit the form and provide just that field along with
the first 4
which are automatically passed from the DB the form submits
fine and no
problem.. I know it has something to do with my If
Statements..
Basically i want to check the 4 fields:
dream_inscript If this one is -1 then pass N/A to the db
dream_price If dream_inscript <> -1 then pass 45 to the
db
dream_comm if dream_comm is empty then pass N/A to the db
custom_inscript if custom_inscript is empty then pass N/A to
the db
custom_wanted if this is Y then pass 45 to the db
custom_comm if this is empty then pass N/A to the db
MM_editCmd.CommandText = "INSERT INTO tbMailOrders
(item_number,
item_summary, item_price, shipping_cost, dream_price,
dream_inscript,
dream_comm, custom_comm, custom_price, video_wanted,
video_price,
grandtotal, cs_name, pp_email, c_email) VALUES (?, ?, ?, ?,
MM_editCmd.Prepared = true
MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param1", 202,
1, 10, Request.Form("item_number")) ' adVarWChar
MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param2", 202,
1, 255, Request.Form("item_summary")) ' adVarWChar
MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param3", 202,
1, 10, Request.Form("itemprice")) ' adVarWChar
MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param4", 202,
1, 10, Request.Form("shippingcost")) ' adVarWChar
If cStr(Request.Form("dream_inscript"))<> "-1" Then
MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param5", 202, 1,
10, "45") ' adVarWChar
Else
MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param5", 202,
1, 10, "0.00") ' adVarWChar
End If
If cStr(Request.Form("dream_inscript"))<> "-1" Then
MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param6", 203, 1,
1073741823, Request.Form("dream_inscript")) ' adLongVarWChar
Else
MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param6", 203,
1, 1073741823, "N/A") ' adLongVarWChar
End If
If Len(cStr(Request.Form("dream_comm")))= "0" Then
MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param7", 203,
1, 1073741823, "N/A") ' adLongVarWChar
Else
MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param7", 203,
1, 1073741823, Request.Form("dream_comm")) ' adLongVarWChar
End If
If Len(cStr(Request.Form("custom_inscript")))= "0" Then
MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param8", 203,
1, 1073741823, "N/A") ' adLongVarWChar
Else
MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param8", 203, 1,
1073741823, Request.Form("custom_inscript")) ' adLongVarWChar
End If
If Request.Form("custom_wanted")= "Y" Then
MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param9", 202,
1, 10, "45") ' adVarWChar
Else
MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param9", 202,
1, 10, "0.00") ' adVarWChar
End If
If Request.Form("video_wanted")= "Y" Then
MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param10", 202,
1, 10, "Yes") ' adVarWChar
Else
MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param10", 202,
1, 10, "No") ' adVarWChar
End If
If Request.Form("video_wanted")= "Y" Then
MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param11", 202, 1,
10, "15") ' adVarWChar
Else
MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param11", 202,
1, 10, 0.00) ' adVarWChar
End If
MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param12", 202,
1, 10, Request.Form("grand")) ' adVarWChar
MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param13", 202,
1, 255, Request.Form("name")) ' adVarWChar
MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param14", 202,
1, 255, Request.Form("email")) ' adVarWChar
MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param15", 202,
1, 255, Request.Form("email2")) ' adVarWChar
MM_editCmd.Execute
MM_editCmd.ActiveConnection.Close
ASP, SQL2005, DW8 VBScript, Access

issue corrected.
ASP, SQL2005, DW8 VBScript, Visual Studio 2005, Visual Studio
2008
"Daniel" <[email protected]> wrote in message
news:[email protected]...
> Can anyone tell me whats wrong with these if statements:
If i sumbit the
> form providing everything except the dream_inscript
field it gives me this
> error:
> =================================================
> Microsoft OLE DB Provider for ODBC Drivers error
'80040e57'
> [Microsoft][ODBC Microsoft Access Driver]Invalid string
or buffer length
>
> /purch_confirm_mail.asp, line 67
> =================================================
> If i submit the form and provide just that field along
with the first 4
> which are automatically passed from the DB the form
submits fine and no
> problem.. I know it has something to do with my If
Statements..
>
> Basically i want to check the 4 fields:
>
> dream_inscript If this one is -1 then pass N/A to the db
> dream_price If dream_inscript <> -1 then pass 45
to the db
> dream_comm if dream_comm is empty then pass N/A to the
db
>
> custom_inscript if custom_inscript is empty then pass
N/A to the db
> custom_wanted if this is Y then pass 45 to the db
> custom_comm if this is empty then pass N/A to the db
>
>
>
>
> MM_editCmd.CommandText = "INSERT INTO tbMailOrders
(item_number,
> item_summary, item_price, shipping_cost, dream_price,
dream_inscript,
> dream_comm, custom_comm, custom_price, video_wanted,
video_price,
> grandtotal, cs_name, pp_email, c_email) VALUES (?, ?, ?,
> ?, ?, ?, ?, ?, ?)"
> MM_editCmd.Prepared = true
> MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param1", 202,
> 1, 10, Request.Form("item_number")) ' adVarWChar
> MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param2", 202,
> 1, 255, Request.Form("item_summary")) ' adVarWChar
> MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param3", 202,
> 1, 10, Request.Form("itemprice")) ' adVarWChar
> MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param4", 202,
> 1, 10, Request.Form("shippingcost")) ' adVarWChar
> If cStr(Request.Form("dream_inscript"))<> "-1"
Then
> MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param5", 202, 1,
> 10, "45") ' adVarWChar
> Else
> MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param5", 202,
> 1, 10, "0.00") ' adVarWChar
> End If
> If cStr(Request.Form("dream_inscript"))<> "-1"
Then
> MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param6", 203, 1,
> 1073741823, Request.Form("dream_inscript")) '
adLongVarWChar
> Else
> MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param6", 203,
> 1, 1073741823, "N/A") ' adLongVarWChar
> End If
> If Len(cStr(Request.Form("dream_comm")))= "0" Then
> MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param7", 203,
> 1, 1073741823, "N/A") ' adLongVarWChar
> Else
> MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param7", 203,
> 1, 1073741823, Request.Form("dream_comm")) '
adLongVarWChar
> End If
> If Len(cStr(Request.Form("custom_inscript")))= "0" Then
> MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param8", 203,
> 1, 1073741823, "N/A") ' adLongVarWChar
> Else
> MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param8", 203, 1,
> 1073741823, Request.Form("custom_inscript")) '
adLongVarWChar
> End If
> If Request.Form("custom_wanted")= "Y" Then
> MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param9", 202,
> 1, 10, "45") ' adVarWChar
> Else
> MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param9", 202,
> 1, 10, "0.00") ' adVarWChar
> End If
> If Request.Form("video_wanted")= "Y" Then
> MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param10", 202,
> 1, 10, "Yes") ' adVarWChar
> Else
> MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param10", 202,
> 1, 10, "No") ' adVarWChar
> End If
> If Request.Form("video_wanted")= "Y" Then
> MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param11", 202, 1,
> 10, "15") ' adVarWChar
> Else
> MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param11", 202,
> 1, 10, 0.00) ' adVarWChar
> End If
> MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param12", 202,
> 1, 10, Request.Form("grand")) ' adVarWChar
> MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param13", 202,
> 1, 255, Request.Form("name")) ' adVarWChar
> MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param14", 202,
> 1, 255, Request.Form("email")) ' adVarWChar
> MM_editCmd.Parameters.Append
MM_editCmd.CreateParameter("param15", 202,
> 1, 255, Request.Form("email2")) ' adVarWChar
> MM_editCmd.Execute
> MM_editCmd.ActiveConnection.Close
>
> --
> ************************************************
> ASP, SQL2005, DW8 VBScript, Access
>

Check for empty cell in report

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case
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i tried using the wasNull() method but that didn't work,
Here's the code, I'm sure you'll be able to get the jist of it when you see it...
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Hi!
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Regards,
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$varColor_rsgetsearch2 = $_GET['Color'];
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if (isset($_GET['Price'])) {
$varPrice_rsgetsearch2 = $_GET['Price'];
mysql_select_db($database_dBconn, $dBconn);
$query_rsgetsearch2 = 'SELECT * FROM products';
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        break;
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        $query_rsgetsearch2 .= ' RRP BETWEEN 1000 AND 2000 ORDER BY price ASC'. GetSQLValueString($_GET['Price'], 'text');
        break;
          case '2000':
       $query_rsgetsearch2 .= ' RRP BETWEEN 2000 AND 10000 ORDER BY price ASC'. GetSQLValueString($_GET['Price'], 'text');
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I would be greatfull for any help

I have managed to solve the problem.
In the end I didn't check if the values were empty, as it worked fine without. However the switch of the price didn't work in combination with the rest of the query.
I've solved the problem as follows:
$varCategory_rsgetsearch2 = "%";
if (isset($_GET['Category'])) {
$varCategory_rsgetsearch2 = $_GET['Category'];
$varMake_rsgetsearch2 = "%";
if (isset($_GET['Manufacturer'])) {
$varMake_rsgetsearch2 = $_GET['Manufacturer'];
$varColor_rsgetsearch2 = "%";
if (isset($_GET['Color'])) {
$varColor_rsgetsearch2 = $_GET['Color'];
$varPrice_rsgetsearch2 = "%";
if (isset($_GET['Keysound_price'])) {
$varPrice_rsgetsearch2 = $_GET['price'];
mysql_select_db($database_dBconn, $dBconn);
$query_rsgetsearch2 = sprintf("SELECT * FROM products WHERE Category LIKE %s AND products.Manufacturer LIKE %s AND products.Color LIKE %s", GetSQLValueString("%" . $varCategory_rsgetsearch2 . "%", "text"),GetSQLValueString("%" . $varMake_rsgetsearch2 . "%", "text"),GetSQLValueString("%" . $varColor_rsgetsearch2 . "%", "text") );
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        break;
          case '500-1000':
        $query_rsgetsearch2 .= ' AND price BETWEEN 500 AND 1000 ORDER BYprice ASC';
        break;
                    case '1000-2000':
        $query_rsgetsearch2 .= ' AND price BETWEEN 1000 AND 2000 ORDER BY price ASC';
        break;
          case '2000':
        $query_rsgetsearch2 .= ' AND price BETWEEN 2000 AND 10000 ORDER BY price ASC';
        break;
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$row_rsgetsearch2 = mysql_fetch_assoc($rsgetsearch2);
I'm sure that you can keep the checking for values in, however for me the was no need for it anymore.
Thanks for all your help

No VISA Resources in Labview but all present in MAX

Hi,
I am unable to find any VISA resources from LabVIEW, however, all NI hardware is available and working in MAX. I have just installed a PCI-8433/2 as well as a NI PCI-8512 CAN/HS Card. As part of the installation I believe MAX was upgraded to version 4.6.2. I will attach the max configuration report for those who are interested. I am working with LabView 8.2. I also uninstalled an agilent GPIB card and as a result the NI-GPIB card is the sole controller and is GPIB0... instead of the agilent card.
I have had a similar problem before that was a result of a corrupted database, but I was unable to find this problem on the forums this time and I am not getting any errors. Just an empty VISA Resource control.
Any suggestions would be greatly appreciated.
Nate
MAX Configuration Report
12/27/2010 1:35:05 PM
MAX Summary
My System
Data Neighborhood
CAN Channels
NI-DAQmx Tasks
V1P1V2P2
V3P3
Devices and Interfaces
GPIB0 (PCI-GPIB)
Instrument0
Instrument1
Instrument2
Instrument3
Instrument4
Instrument5
Miscellaneous VISA Resources
GPIB0::INTFC
GPIB0::16::INSTR
GPIB0::2::INSTR
GPIB0::22::INSTR
GPIB0::7::INSTR
GPIB0::10::INSTR
GPIB0::27::INSTR
GPIB0::3::INSTR
Network Devices
NI-DAQmx Devices
NI USB-9481: "Dev2"
NI USB-9481: "Dev1"
NI-XNET Devices
NI PCI-8512 CAN/HS
CAN1
CAN2
PCI-8433/2
Port1
Port2
PXI System (Unidentified)
Serial & Parallel
COM1
COM6
COM9
LPT1
Scales
Software
IVI Compliance Package 3.3
LabVIEW 8.2
LabVIEW Run-Time 7.1
LabVIEW Run-Time 8.0.1
LabVIEW Run-Time 8.2.1
LabVIEW Run-Time 8.5.1
LabVIEW Run-Time 8.6.1
LabWindows/CVI Run-Time 9.0
Measurement & Automation Explorer 4.6.2
Measurement Studio for VS2005
DotNET
Common
NI LabVIEW SignalExpress 3.0
NI Spy 2.7.1
NI-488.2 2.46
NI-CAN 2.7
NI-DAQmx 8.7.2
NI-PAL 2.5.3
NI-Serial 3.6
NI-USI 1.0.2
NI-VISA 4.6.2
NiVisaServer.exe
NIvisaic.exe
NI-VISA Runtime 4.6.2
NI-XNET 1.1
IVI Drivers
Advanced
Instrument Driver Software Modules
Simulation Driver Software Modules
Simulation Driver Sessions
Driver Sessions
Logical Names
-Nate
Solved!
Go to Solution.

Now that IS odd.
Can you show a couple screen shots from MAX?
First expand the software tab and post a png of the screenshot (I'm not yet convinced you do not have SOME driver issue)
Next select MAX>TOOLS>NI VISA>VISA Options- Wait for the new screen then expand Mysystem General settings and select Aliases.
You could also try "Clear all aliases" from there and reboot.
Jeff

Check for required fields before locking subforms and submitting

Hello,
I have a 5-page form with many questions, to be completed by the original requestor and multiple approvers. What I'm trying to do is have the original requestor's Submit button on p. 3 lock the input on the first three pages, but first check if all those fields have some content. I currently have all the fields on pp. 1-3 set to "Required" in the object properties, but my script still locks them when there's is one empty one. Here's what I have:
//Lock portions of form
Page1.access = "readOnly"
Page2.access = "readOnly"
Page3.access = "readOnly"
//Save document, allow user to change name
app.execMenuItem("SaveAs");
//Submit via e-mail
Submit_REAL.event__click.submit.target = "mailto:[email protected]" +
"?subject=Subject text" +
"&body=Message";
Submit_REAL.execEvent("click");
The automatic check for required fields happens after the pages get locked. I would like the check to stop the process before it locks the pages. Is there any way to check all at once that all "Required" fields on those pages have some content before allowing the script to proceed? I know how to script it to manually check the 50 or so questions on those pages, but I would like to avoid that. Thanks for any help.

There are a few problems that I can see from the start. First, your code is going to pick up EVERY node that exists on these pages. Some of those nodes will not have a rawValue, and some will not have an actual name. As an example, you can take your code and create a text field to dump all of the names of the nodes that you get when you pull in all of the nodes this way. Here's an example:
The result:
Now, the question is, do you have a consistent naming convention for your fields that might be empty? That could be text fields, radio button lists, etc. For instance, I always prefix the names of objects in order to more easily keep track of what they are in scripts. Since I'm doing that, I can check the name of the field for tf, nf, rbl, cb, or whatever I have included to make sure that I'm checking an actual field before I check for things like rawValue.
var nodeName = oNodes.item(nNodeCount).name;
if (nodeName.indexOf("tf")>-1 || nodeName.indexOf("rbl") > -1 || /*check other field types*/) {
//insert your code to check for empty answers here
As for your line 7 issue. The syntax problem is that you've put extra parentheses in your if statement. Take out the parentheses that are just before and after the or "||".
*This is my fourth attempt to reply. Something was going on with Adobe/Jive earlier, I suppose.

Visa Resource Name in cluster passed to Network Stream writer causes error 42.

If I try and pass this "motor data" cluster with an embedded VISA resource name:
to a Network Stream Writer in this manner:
Then I get this error from the "Write Single Element to Stream" VI
If I change the motor data cluster TypDef so that a string control is used instead of the VISA reference, the error disappears and the data passes over the Network Stream without problem.
Is this expected behavior?
I thought that the "data in" (type = "POLY"?) like the one found on the "Write Single Element to Stream" VI was supposed to accept pretty much anything...
Solved!
Go to Solution.

Doug
I would consider this a bug, as the memory location (more precisely the VISA refnum or session) of a VISA resource means nothing on a potentially remote system. Also I was under the impression that most streaming methods like binary file IO, but also the network streams would use the LabVIEW flattened format for data clusters and for that the VISA resource name would be the only logical choice instead of the underlaying VISA refnum, but I might be wrong in this specific case and the default behaviour for flattening VISA resources might always have been to the VISA refnum.
Considering that the VISA control can resurect the VISA session from a VISA resource name if it is already opened, flattening to the VISA resource name instead would be more logical, but using a string control in the cluster type definition is a reasonable work around of course.
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

Visa Resource name does not list anything

Hi,
I recently installed a Agilent 82357B GPIB and along with it I also installed Agilent IO 16.3. This GPIB is hooked up to a power supply. I am able to find and query the device in MAX and Agilent IO, but when I use the Visa Resource Name control in a VI, it does not list anything. Before I used to see LPT1 and COM1, but now even they have disappeared. All these are present in Device Manager. Even VISA interactive control throw an error. Attached are screenshots for some reference.
HP_GS
Attachments:
VisaResource-Refresh.png ‏2 KB
Visa-IC.png ‏7 KB

Hi there,
You might want to read this post about the specific error.
Also you need to make sure the right class is slected for the visa resource (right click):
Hope that helps, regards W

Check for null and empty - Arraylist

Hello all,
Can anyone tell me the best procedure to check for null and empty for an arraylist in a jsp using JSTL. I'm trying something like this;
<c:if test="${!empty sampleList}">
</c:if>
Help is greatly appreciated.
Thanks,
Greeshma...

A null check might not be you best option. If your requirement is you must have both the date and time component supplied in order to populate EventDate, then I would use a Script Functoid that takes data and time as parameters.
In the C# method, first check if either is an empty string, if so return an empty string.
If not, TryParse the data, if successful, return a valid data string for EventDate. If not, error or return empty string, whichever satsifies the requirement.

Check for empty visa resource?

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