Closing Excel with ActiveX causes problem

Hallo,
I am having a problem using ActiveX and Excel. I
am using NT 4.0, Service Pack 3, Excel 97, Service
Release SR1 and LabVIEW 5.1.
My LV application opens an Excel worksheet,
operates on the sheet and then closes it by using
ActiveX. Everything works fine until I try to
start Excel from the desktop after running my LV
application. Then I get an "Exception access
violation" generated by excel.exe. It seems like
my application does not manage to end the
excel.exe process which leads to the "violation
error" next time Excel is to be opened. To quit
Excel I call the "quit" method in
Excel_Application and then call the "Automation
Close".
Anyone knows how to solve this?
\Helena Dimitriou
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Greg, this is the problem: Granted that Excel closes properly when users try to close all opened refnums, when this VI is used as subvi (loop) "Excel.exe" does not close (every instance opened). It stays in the Task Manager until the program that uses this subVI ends. This is not good because "Excel.exe" uses a large memory.Just think what will happen if I try to use this "Excel" subVI a couple of hundred times in an application VI. It leaves at least 6000kb of memory for every instance multiply it by a couple of hundreds, then your PC crashes.
Another, open only one instance, the "Excel.exe" process remain in the Task Manager.
What can you say? You haven't tried?
Try this: create a vi which will open the Excel Application (wire the "open new instance
" terminal to TRUE), open an existing Excel workbook, add sheet, write numbers 1 to 255 from A1 to A255 and B1 to B255 to the added and close the ranges where the numbers are written, close the added sheet, close the opened workbook and close the Excel application. Then use this vi in a loop that iterates 500 times so that 500 sheets (plus three as default to Excel) will be added to the opened workbook. Before running the VI with the loop, open your Task Manager>>Processes. Run the VI and monitor how many "Excel.exe" while the loop is running and the memory usage it consumes. And take note of the "Excel.exe" which will remain in the Task Manager after the vi with loops ends. Then e-mail me ([email protected] OR [email protected]) of things that went wrong and how to solve the problems that causes for things to go wrong.
Of course you can also send your VI.
This my main problem.

Similar Messages

Can't open excel file after saving and closing excel with activex

I'm using activex to write and save excel files in LabVIEW. My application opens excel (not visible)writes a file, saves it, and then closes both the file and excel. When I try to open the file Excel opens but the file is not displayed, I see the excel header and footer but the file itself does not display. My application is still running at this point. Any suggestions?

It is critical when using ActiveX with Excel that ALL refnums be properly closed when they are no longer used. Just a single refnum left open will cause the exact situation that you describe. Typically, but not required, the refnums will be closed in the reverse order in which they were created. Here is a good sequence:
Open Application ref
Property Workbooks ref
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Close Workbooks ref
Select Sheet ref
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When you have properly closed all refnums, the problem will disappear.
Michael Munroe
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www.abcdef.biz
Michael Munroe, ABCDEF
Certified LabVIEW Developer, MCP
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Hi,
I am using LabVIEW6.1 and I am trying to format data for printout that I have stored in Excel using activeX.
I have three questions that I included the recorded Excel macro for:
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You cannot index the VPageBreaks if you are creating a new worksheet. You would use the index to change an existing VPageBreak. To create a new VPageBreak, replace the Item method with the Add method. Wire the range ref directly into the Before input. I fixed your VI and attached it.
To get the value of the xlCenter constant, open the Visual Basic editor that comes with Excel and use the Object Browser (F2). Type xlcenter into the search window and click the binoculars. The value is displayed at the bottom of the window. You will use that trick a lot when looking for the Excel constants for LabVIEW.
Michael
Michael Munroe, ABCDEF
Certified LabVIEW Developer, MCP
Find and fix bad VI Properties with Property Inspector
Attachments:
Excel_Page_Break_mod.vi ‏67 KB

Help with quitting Excel with activex (save-dialog)

Hello.
I have following question.
I have a VI that writes data from measurement devices into an excel file. Afterwards I want to change the order of the entries with the help of activex.
All that works fine, but when I quit excel the save-dialolg always pops up. I searched this board for possible solutions and experimented quite a bit but I still get one dialog at the end.
Well, now at least it is only one and not multiple ones. The loop in my the implementation for the data manipulation might be the cause, but if it is it, i don't know why or how to solve it. But maybe it is something different. Anyway, I cannot find the reason.
Some help would be really appreciated .
Thank you very much in advance.
Regards
CD
Solved!
Go to Solution.
Attachments:
labview excel.JPG ‏136 KB

OK. In the attachment is a picture of the modifications.
Now I have to two problems.
First, after running it in highlight modus, I now know the dialog pops up at the _Workbook.close invoke node. Despite setting true to SaveChanges.
Second, I now get an error code -2147352565 - unknown error at invalid index. and nothing gets saved.
Attachments:
labview excel changesI.JPG ‏79 KB

Handling Popups in Excel with ActiveX

I'm having a problem similar to the problem referenced in this post:
https://forums.ni.com/t5/LabVIEW/Handling-popups-of-Excel-while-editing-it-via-Active-X-Control/td-p...
The difference being...
My company has an Excel "database" that stores all of our product information. When starting my application I read from this database using ActiveX. Recently this Excel sheet was updated to include new capabilities by someone else within my company.
Now, when opening this particular worksheet, I get this message:
It doesn't come to the front of the screen, and unless the user realizes that it is coming the LabVIEW program seems to hangup, causing the user to close the LabVIEW program, because they don't realize that LabVIEW is waiting on Excel, which is waiting on the user to make a selection on this popup.
In the post I referenced above, they get around this by using a Property Node with the "Display Alerts" property set to false. This works for hiding errors but doesn't seem to work for this instance.
Is there a way, through ActiveX, to "click" the "Don't Update" button without the user having to do this.
OR
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Thanks
Solved!
Go to Solution.

If anyone stumbles upon this page looking for a solution, here is how I ended up solving the issue:
http://support.microsoft.com/KB/826921

Writing array to Excel with ActiveX

Common question I suppose, but I'm still having issues despite reading several posts about the issue.
Problem is I'm trying to write a 1D array of data to 1 column in an excel document. However, unless I add an artificial column (of blank values or some other bogus #), ActiveX only writes the 1st value of my array to the column.
Look at the attached. In Picture 1 I add an articial column and everything writes fine. In Picture 2 I don't add this column and only the 1st value of the array gets written in each row.
Suggestions?
Thank you.
Solved!
Go to Solution.
Attachments:
images.jpg ‏233 KB

I haven't done much with Excel and LabVIEW by way of ActiveX. Creating a small VI and duplicating what you show in your screenshot, I see the same behavior.
I believe that Excel interprets a 1-D array as something that runs horizontally. So a 1-D array consists of a single row of cells and N number of columns.
(Actually LabVIEW interprets a 1-D array like this as well, but it allows you to show an array onscreen either vertically or horizontally.)
Converting to a 2-D array and transposing is what you need to do to have that 1-D array be treated as a single column of cells.
Note that you don't have to use build array and append an empty array to it. You can just use build array as is and it will turn a 1-D array into a 2-D array.
Attachments:
Example_VI.png ‏22 KB

Import Excel with Import Wizard / Problem during the import of "Actual Work" column

Hello,
I am trying to import an Excel File (*.xlsx) to Project Server 2013 through Project Professional 2013 and Import Wizard.
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Which DW are you using - DMX on Mac? It didn't have that
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Murray --- ICQ 71997575
Adobe Community Expert
(If you *MUST* email me, don't LAUGH when you do so!)
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http://www.dwfaq.com - DW FAQs,
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==================
"Terry_Straehley" <[email protected]> wrote
in message
news:fm85u9$5ec$[email protected]..
> From a 11/06 post
> <<Hi, My Dreamweaver MX Education Version does NOT
have the Import to
> Excel
> option. I am using "Excel 2003 (11.6560.6568) SP2, Part
of Microsoft
> Office
> Professional Edition 2003". If I start with a blank page
in Dreamweaver,
> click
> on File, Import, I only have the options "XML into
Template", "Word HTML,
> and
> "Tabular Data". Does anyone know why I don't have the
"Import Excel" >>
>
> This was not answered in the thread I copied it from. I
have the same
> problem.
> Can some one answer the question?
>

Excel Get ActiveX References.vi and closing references -- grrr

I'm new to ActiveX stuff, but eager to learn!
The "grrr" in my Subject line is a reference to how I feel about LabVIEW's documentation from time to time. I'm a dinosaur who came from text-based programming, and did a fair amount of C coding, so sometimes with LabVIEW I'm left with this awful feeling in the pit of my stomach like, "Good grief! How much memory must LabVIEW be hogging up in the background when I use this vi?" or "What happens to those variables (wires) in that subVI when it completes but doesn't close? What are their statuses when I come back in the next time?" or "What if I put a lot of elements into that array the first time and then started from element zero the second time and just put in a few? What has happened with the memroy that was allocated when there were a lot of elements?"
Today I'm stewing about this "Excel Get ActiveX References.vi," and what happens to the "ActiveX references" it generates each time I call the subVI in which "Excel Get ActiveX References.vi" lives. I think that at least one of the "ActiveX references" it generates when I call it is of the type Excel._Application. Then there appears to be an Excel._Workbook, and others. You see, I've used "Excel Easy Report.vi" to put some data into an Excel spreadsheet, and I want to tell Excel to do a "Save" on the open spreadsheet. I think ActiveX is the (a) right way to do that, so I'm wading into the ActiveX fray... But this "Excel Get ActiveX References.vi" says in its help file, "Do not close ActiveX references opened with the Excel Get ActiveX References VI. References must remain open until the report is closed. Otherwise the error 3001 will occur." Well, these Excel workbooks that get created by my VI could well stay open until after my LabVIEW VI terminates!
So (finally), here are some of my quesitons:
1) When I go through my subVI once, pointing to one workbook, I'll get one set of references "created" or "opened" or whatever you call it when ActiveX references spring into existance. Now, when I exit the subVI, is it going to automatically try to "close" those ActiveX references? I don't suppose so, since subVI's stay in memory until the calling VI closes.
2) Now, I come back into my subVI a second time. New workbook gets created, so I get new references. Ok, fine. Uh oh! What happened to those old references? I suppose that if I didn't somehow save them off, I've probably lost the ability to get them back (maybe I'm wrong, but I don't need them back), but is LabVIEW going to "close" those old references (from previous times through the subVI) because I can't get to them anymore? Won't that cause the dreaded error 3001? If LabVIEW is not going to "close" them, what in tarnation happens to them (the old C programmer in me creeping back out)?? Now it's some oddball, orphaned reference, floating out there, hogging memory, waiting to make something crash intermittently and be a debugging nightmare?
3) Now, here's the real scary one. I think I might dodge the "error 3001" bullet in questions 1) and 2), but now let's say the user closes my LabVIEW application while Excel is still open. All those workbooks are still open. Presumably, all those ActiveX references I was not supposed to close are still open. I really hope that LabVIEW is decent enough to close/erase/delete/blow-away (whatever the right word is) all those ActiveX references which were opened/created by "Excel Get ActiveX References.vi" when my program terminates. But, oh no! Won't the error 3001 come along then? I suppose I can just dump it in the shutdown error handling.
Well, thanks for reading my novel. I don't know what can be done with LabVIEW documentation to make it more satisfying to folks like me, but perhaps someone can weigh in on all my ActiveX questions here.
Thank you in advance,
Steve Brady
Solved!
Go to Solution.

You need to close EVERY ActiveX reference you open. If you don't you'll end up with some Excel processes running even after LabVIEW exits. You can see them in Task Manager.
I, personally, don't like the LabVIEW Report Generation Tool Kit for working with Excel. I don't think it's flexible enough. I have a growing library of VIs that I've written that open, manipulate, and close Excel. Some references I pass from VI to VI and some I close right after I use them. It all depends on what I'm doing. If I want to enter read or write data from/to a certain range I'll get the range reference, read or write the data, then close it right away because I have no use for it any more. On the other hand, when I open Excel or a Workbook I keep the reference until I'm done, which could be later in the program.
1) When I go through my subVI once, pointing to one workbook, I'll get one set of references "created" or "opened" or whatever you call it when ActiveX references spring into existence. Now, when I exit the subVI, is it going to automatically try to "close" those ActiveX references? I don't suppose so, since subVI's stay in memory until the calling VI closes.
2) Now, I come back into my subVI a second time. New workbook gets created, so I get new references. Ok, fine. Uh oh! What happened to those old references? I suppose that if I didn't somehow save them off, I've probably lost the ability to get them back (maybe I'm wrong, but I don't need them back), but is LabVIEW going to "close" those old references (from previous times through the subVI) because I can't get to them anymore? Won't that cause the dreaded error 3001? If LabVIEW is not going to "close" them, what in tarnation happens to them (the old C programmer in me creeping back out)?? Now it's some oddball, orphaned reference, floating out there, hogging memory, waiting to make something crash intermittently and be a debugging nightmare?
3) Now, here's the real scary one. I think I might dodge the "error 3001" bullet in questions 1) and 2), but now let's say the user closes my LabVIEW application while Excel is still open. All those workbooks are still open. Presumably, all those ActiveX references I was not supposed to close are still open. I really hope that LabVIEW is decent enough to close/erase/delete/blow-away (whatever the right word is) all those ActiveX references which were opened/created by "Excel Get ActiveX References.vi" when my program terminates. But, oh no! Won't the error 3001 come along then? I suppose I can just dump it in the shutdown error handling.
1) No, LabVIEW will NOT close those references. You need to make sure that happens.
2) You can save the references in a functional global or use a class but if you're not going to save them close them as soon as you're done with them.
3) Your user should not be able to close your LabVIEW application without it going through the shutdown routine you've created for your program. The ABORT button should never be exposed to the user and you should capture and discard the panel close event so your program ALWAYS shuts down is an orderly fashion. If you don't you will have fragments of Excel hanging around in your operating system and will have to kill those processes using Task Manager. That should only be a problem during development, not once deployed.
I used to program in C and Assembly many moons ago. You should have seen my first LabVIEW code. I go back and look at it just so I can see how far I've come in the last 12 years. I feel your pain.
Kelly Bersch
Certified LabVIEW Developer
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FF 3.6 AND 5 on same Mac, 1 profile - can I uninstall 5 without causing problems running 3.6 or with the profile?

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How to list all currently open Excel files with ActiveX?

Hello all!
I would like to program with ActiveX a way to retrieve a list (array of strings) of the filenames of the currently opened Excel files in windows. However, I am fairly new to the ActiveX/Excel business in LV and after hours looking at the "millions" of objects in the property nodes I give up and hope some kind soul here can help me. I couldn't find any information in this forum regarding the same issue, although some were close
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Thanks!
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Hi KC,
thanks for your reply. I have in fact been able to find the desired things in the ActiveX properties/methods for Excel in LabView. It took me some looong work going through the functions which I suspected to be the ones. Anyway, I post a little jpeg here of the code if someone ever needs the same functionality. What it does is that it checks how many Excel workbooks are open and controls if each of them matches the searched Excel filename, if one does, it is closed.
Enjoy
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Attachments:
List open excel sheets and close open ones.jpg ‏104 KB

There was a problem sending a command to this program. Excel with new templates.

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Read 2 Strings from EXCEL with GOOP or ActiveX?

Hello,
i use Labview 5.1 with WIN NT4.0 SP6a and i programm a fuzzy Logic tool for a exam in Computer Science.
Now i have a problem, and i read something about the GOOP and the EXCEL Toolkit. I download it and try more times to install but i can't link the *.llb in the Function Palette. Is this GOOP and Excel Toolkit only for Labview 6.x ?
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"fuzzylogic" wrote in message
news:[email protected]..
> Hello,
> i use Labview 5.1 with WIN NT4.0 SP6a and i programm a fuzzy Logic
> tool for a exam in Computer Science.
> Now i have a problem, and i read something about the GOOP and the
> EXCEL Toolkit. I download it and try more times to install but i can't
> link the *.llb in the Function Palette. Is this GOOP and Excel Toolkit
> only for Labview 6.x ?
>
> I solve it with ActiveX and Excel, but my very big Problem is, i need
> to read2 string from the Excel table from the same time, and with
> ActiveX i don't find any method how can i do that.
>
> I don't know how can i read 2 Strings from a Excel table, Can i do it
> with the Excel Toolkit,if yes how, m
aybe anyone make it or any
> helpfiles?
I'm pretty sure the excel toolkit is written for 5.1, and don't know why it
would give you problems. Do you have excel installed? I'm not sure what
you mean that you cant link the *.llb in function pallette. Have you tried
opening the llb using '\functions\select a vi' ? As to how to read two
cells at once, you could read a block of cells including both cells (ie:
A5..D10) and then pull the data out of the array.

Pivot tables causing problems in Excel 2013

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TechNet Community Support
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Read our privacy statement online:
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If the online privacy statement is not available, please read our privacy statement offline:
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jamodi
What computer operating system is your Premiere Elements 12 installed?
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https://www.piriform.com/ccleaner
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(If you have McAfee as the antivirus, that may be problem, and we can take care of that without having to go
through this uninstall/ccleaner/reinstall.)
Let us start here and then decide what next.
Thank you.
ATR

Need help with Excel and ActiveX

I am new with working with ActiveX, so I need some help regarding writing to a spreadsheet. Here is what I need to do:
1.The user weighs a product on a scale.
2.The user presses the weight button control in labview to retrieve the weight via serial port.
3.The value gets written into a spreadsheet, starting at D2.
4. User weighs the same product after use to get a new weight.
5. labview goes through the same process, but this time it gets written to E2.
6. Differential is calculated (still debating on having the user do this in Excel instead of Labview, since they have to set up a spreadsheet outside of labview for other info not related
to weight).
7. User close labview when finished.
The serial comm and all is fine, but the problem I am having is trying to get a specific cell value written in D2 and then getting another value to be written in E2. For example, initial weight would be D2 and post weight would be E2, and then differential would be F2. For the next product, it would be D3, E3, F3, and so on. What would be the best way to implement this? It looked as if ActiveX would be the only real way to tell Excel where to put the data, but there is still alot I have to learn in where to find and use the proper nodes to complete the process.
Thanks,
Jody M.
The Procter and Gamble Co.
Certified Labview Developer
Currently using LV2012.

Hi z2830than,
see the attached example. It make following things: open Excel, create new Workbook, ..., write Data to D2, save Workbook and close Excel.
Hope it helps.
Mike
Attachments:
Excel_open_write_close_Example_LV71.llb ‏234 KB

Closing Excel with ActiveX causes problem

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