File Dialog Box in the applet

Hi...
I am trying to make an JAVA applet in which i am trying to read the File through JFileChooser, so for that we need a dialog box to show up...right...
when i run that applet from the JCreator environment, it does shows me that dialog box when i click on the menu and say open..
but when i tried running just that webpage and try opening a file through the menu, it didn't work....any ideas y...
Anchal

Applets cannot access the local file system, nor can they make connections to a server
other than the one the applet came from. it can allso not run other programs.
Sign the applet or let the client set up a policy for it.
http://forum.java.sun.com/thread.jsp?forum=63&thread=524815
second post
My guess is that when you run the applet with JCreator a full permission policy is used
just like with Eclypse.

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Hi!
waldemar.hersacher wrote:
"It seems that the VIs called by the clients are running in the user interface thread.
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2 linus:
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cle, which responsible for visualization will run continuosly at the same time...
Attachments:
no_block_with_file_open_dialog.zip ‏42 KB

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Hi!
waldemar.hersacher wrote:
"It seems that the VIs called by the clients are running in the user interface thread.
A call to the file dialog box will call a modal system dialog. So LV can't go on executing VIs in the user interface thread."
Are you sure? I think, that File Dialog, called by LabVIEW File Dialog from Advanced File Functions Palette doesn't blocking any cycles in subVI, which running in UI Thread. Look in my old example (that was prepared for other topic, but may be good for this topic too).
2 linus:
I think, you must a little bit reorganize you application for to do this. You must put your File Dialog into separated cycle. This cycle, of course, will be blocked when File Dialog appear on the screen. But other cy
cle, which responsible for visualization will run continuosly at the same time...
Attachments:
no_block_with_file_open_dialog.zip ‏42 KB

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Attachments:
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<pre>
function doSubmit(r) {
if (ser_changed.length > 0) {
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catch(err) {
html_HideElement('AjaxLoading');
alert('Invalid file');
} else {
document.wwv_flow.submit();
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$x('CANCEL_BUTT').disabled=false;
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</pre>
<pre>
function html_Submit_Progress(pThis,topass){
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else{pThis.innerHTML='...Loading...'};
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window.setTimeout('$x("wait").src = $x("wait").src', 100);
doSubmit(topass);
</pre>
Edited by: cmorris260 on Sep 19, 2008 3:30 PM
Edited by: cmorris260 on Sep 19, 2008 3:31 PM

Webutil for Forms 10g - Apple Mac Client - Save File Dialog Box

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The Windows java console says:
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Loaded image:..
proxyHost=null
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File Dialog Box often takes a long time to execute

Hi all
The Labview File Dialog Box Express VI sometimes takes 5 to 10 seconds to execute. On other occasions, it executes in a blink of an eye. Why is that so?
I have tried to use the older Open/Create/Replace File VI as suggested in one of the forum's posts...but it behaves exactly the same way. Another problem is the trimming of the filename, which has also been reported and has NOT YET been solved.
(By the way...Recently, I updated to LV 2012 SP2 by suggestion of the NI Update Manager, only to find out that I was not entitled to this SP (which apparently only includes bug fixes) and I will have to roll back to LV 2012. Still, in the evaluation version I can see that the bug is not fixed. Labview must have a lot of serious bugs for NI to ask for a paid bug fix, in which some bugs remain after having been reported a long time ago..well...)
What worries me now is that intermittent lag in the execution of the File Dialog (such a basic basic function of a program...). Anyone have any idea about this? The support menu said "Ask an engineer"...any of the NI engineers has any suggestion?
Regards
Helder
Attachments:
FileDialogTest.vi ‏26 KB

First of all: Thank you very much for the objective answer. I suppose that yor actually ARE a NI engineer, as I had hoped for.
lease find my comments above (helder---------------------)
helder wrote:
The Labview File Dialog Box Express VI sometimes takes 5 to 10 seconds to execute. On other occasions, it executes in a blink of an eye. Why is that so?
What worries me now is that intermittent lag in the execution of the File Dialog (such a basic basic function of a program...). Anyone have any idea about this?
The file dialog is provided by the OS, so if it is slow it is not LabVIEW's fault.
What kind of computer do you have? Is this a laptop that spins down the HD to save power? In this case it needs to wait for the HD to spin up. (You can change the windows power profile or you can spend more money and get an SSD).
Are you very low on memory?
Does your LabVIEW program waste 100% CPU in parallel doing nothing due to bad coding?
Are you pointing to a location that has millions of files?
Are you pointing to a network location?
helder:---------------------------------------
I understand that the File Dialog is provided by the OS. But I have other applications on my PC and this doesn't happen - just in Labview. Sorry! And sometimes it
doesn't happen. Every 10 times I open the File dialog Box, 5 times it takes long and 5 times it is immediate.
(I am not low on memory, my coding is not bad>-look at the VI I sent, it just contains the fragment which uses the File Dialog Box and it behaves the same way! I am pointing to the same location that the other applications point to, I am not pointing to a network location, the PC is not spinning the disk down, etc etc.)
But yes, I will try it on another PC
(There was another post on the forum on this issue, but can't seem to find it now, just find my own post )
I attach a video demo of what happens.
helder wrote:
Another problem is the trimming of the filename, which has also been reported and has NOT YET been solved.
What problem is that? Can you elaborate? There is a known bug in the windows dialog box that sometimes the pre-filled file names are shifted and not fully visible. This is a windows bug documented by Microsoft and LabVIEW has no control over it. It is not NIs job to fix OS problems.
helder:-------------------------------------------
Of course you can't fix the OS.
If it is a windows bug, we will have to live with it.
A previous post on your forum did not provide me with that information (http://forums.ni.com/t5/LabVIEW/File-dialog-trimming-the-default-name/td-p/2189874). The fact that it is a windows bug was not mentioned there.
helder wrote:
Hi all
(By the way...Recently, I updated to LV 2012 SP2 by suggestion of the NI Update Manager, only to find out that I was not entitled to this SP (which apparently only includes bug fixes) and I will have to roll back to LV 2012. Still, in the evaluation version I can see that the bug is not fixed.
Patches are included, service packs are not included. I think this is well documented. Most users are on SSP, this way you are always entitled to the newest version.
As with anything else, software has bugs. It is impossible to test a huge, complex system like LabVIEW under all scenarios. The possible number of combinations of hardware and other installed software on any particular computer probably exceeds the number of atoms in the universe. It is actually amazing how few bugs there are and how well it works. What "bug" are you talking about? Bugs are prioritized according to rules. Critical bugs are typically fixed very quickly. A cosmetic issue that only affects you and nobody else will take longer or might not even get fixed. Are you talking about a confirmed bug that could be reproduced by NI? Do you have a CAR#?
helder:----------------------------------------
I was referring to the file-name-shifting-cosmetic-bug that the October-2012 post had indicated. But if it is a Windows-bug, NI does not have any responsibility, of
course.
Regarding the bugs, of course they are unavoidable.
helder wrote:
Labview must have a lot of serious bugs for NI to ask for a paid bug fix, in which some bugs remain after having been reported a long time ago..well...)
That sentence makes no sense! Why would the number of serious bugs depend on the cost of upgrading?? You are just rambling here....
In an ideal world, NI would have an unlimited number of programmers that can work 24/7 to immediately fix any discovered bug. This would only be possible if all users are willing to pay an unlimited amount of money for the software. As I mentioned, bug fixes are free in the form of patches, and they come out regularly. Service packs include new features and are not free.
helder:---------------------------------------
"....include new features"..????
---->>From http://www.ni.com/labview/release-details/
"LabVIEW 2012 Service Pack 1 is an exclusive update to LabVIEW 2012 for NI Standard Service Program (SSP) customers. There are no new product features introduced in service pack releases; instead, these releases provide bug fixes and improved stability for LabVIEW 2012. For a list of these bug fixes, click here."
No new features, just bug fixes!"
Moreover: If it isn't free, it shouldn' have let me update if I am not a SSP costumer.
Now I have a 45 days evaluation version. After that, I have to uninstall and reinstall everything.That takes some time and effort.
If there is a more direct way of rolling back t the previous version, please let me know.
Thank you

How to create a custom file dialog box/vi (win)??

Hello,
I'd like to create a custom file dialog box to handle the reading of my tdms files. Basicly I want to extend the existing file select dialog box with a graphical preview of the data in the selected file. I know I can create all the logic for file selection by hand and use a list box to display the filelist, but I would rather prefer to somehow use the existing windows controls. So is it possible to get the windows file selector on the front panel of a vi and react to the user selection? If so, is there any example available on how to do this? Any other options? I'm using labview 8.2
thanks for your input!
klaus

Klaus,
I wouldn't know that Microsoft provides access to the controls that Explorer and file dialog consist of.
There might be a different and more powerful solution though. The
WINDOWS Explorer / file dialog have a plugin API that allows you to
associate your own application for thumbnail creation with a particular
file extension. That way, TDMS thumbnails will show in any instance of
Explorer and
File Dialog without you having to make your own dialog. Basically, you
would need to compile the VI that creates the thumbnail into a
LabVIEW-built DLL and then wrap this DLL with some C++ boilerplate code
that Microsoft provides. You might want to have a look at the bottom of
this article to get an idea of how the whole thing works:
http://msdn.microsoft.com/msdnmag/issues/0600/w2kui2/default.aspx.
Hope that helps,
Herbert

File Dialog Box in the applet

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