Capturing events fired by ACtiveX control

How can i capture events fired by ACtiveX control. i am using RegEventCallback vi, but that controls user driven events. i have an activeX control that fires events at unspecified time, now i want to know how to handle such events in LabView.
Rubina

Hi InformaticsComplex,
Using the Register Event Callback VI is the correct method to capture events generated by an ActiveX control. Register Event Callback registers a VI to be called when the event occurs. I suggest checking out the LabVIEW Help articles Using ActiveX with LabVIEW and Register Event Callback as well as the following examples. I hope this helps!
Examples (all found in NI Example Finder):
ActiveX Event Callback for Excel VI: labview\examples\comm\axevent.llb
ActiveX Event Callback for IE VI: labview\examples\comm\axevent.llb
NET Event Callback for Calendar Control VI: labview\examples\comm\dotnet\Events.llb
NET Event Callback for DataWatcher VI: labview\examples\comm\dotnet\Events.llb
Mike Lyons
National Instruments
http://www.ni.com/devzone

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CEO: What exactly is stopping us from doing this?
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I refer to the blog
<a href="/people/thomas.jung3/blog/2004/09/01/using-net-windows-controls-in-the-abap-control-framework:///people/thomas.jung3/blog/2004/09/01/using-net-windows-controls-in-the-abap-control-framework
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Hi Juergen,
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How are you identifying your events and registering them in SAP?. I have very little experience in Delphi - but I'm hoping COM is universal enough?
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Hi,
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MOVIE LOADING...
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MOVIE LOADING...
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</tr>
<tr>
<td align="center">
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Play 2
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Stop 2
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Very curious to see answers to this post — I'm not getting a 'qt_ended' event in either Safari or Firefox (3.5.2). Nor were some of the other events firing (qt_timechanged comes to mind). Have noticed numerous messages on boards regarding troubles with the QT events, so I may just keep using my workarounds -- setInterval() monitoring loops.
N

Need help inserting ActiveX Control

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TIA
Attachments:
ActiveXTest.zip ‏277 KB

Thanks for your reply nathand and taking the time to look at my sample.
Yes, it is a very ligh VI because it doesn't have to do much. I want to numeric inputs that set the StartPos and StopPos properties of the ActiveX control and then call the BeginRun method (ie. 3 controls). Data is returned in the OnData event asynchronously and displayed (ie. 1 numeric display). I'me used to programming with the likes of VB and C# where events are a matter of course and you just select the event you want to code for and write the code so all this talk of "separate VIs" and "User Parameter List" is all confusing to me. The VB and C# samples I provided literally took me 15 minutes to write both and I won't tell you how embarrassingly long I spent playing with labview. From memory in (HP) VEE it was relatively easy to make a basic demo using our ActiveX control but we won't be supplying a demo for that this time (or possibly the old demo still works). This is supposed to be such a basic labview sample being provided by the vendor (our small company) as you suggested.
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Attachments:
ControlTest2.zip ‏15 KB

Integrating custom ActiveX control with SapGUI

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I've written a test program for my control and when I change my SapGUI colors the rest of the controls etc on the screen do change color but my control only change color once I've performed some action that fires the PAI. Personally I think the controls written by SAP intergrates with the SapGUI through some interface that is called behind the scenes by the SapGUI since the GUI will have some way of knowing the set of ActiveX controls instantiated inside it and I cannot find any event in the ABAP controls framework (e.g. CL_GUI_OBJECT, CL_GUI_CONTROL) that will allow this type of integration. I'll be digging for the answer but any suggestions will by greatly appreciated.
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Kind regards
Ettienne Hugo

Hello Ettienne Hugo,
To get the SAP GUI Theme or font changes events you need to add your MFC application or ActiveX MFC dll into u201CSAP Configuration->Application Tab->Addu201D and u need to call the functions SapHookInit and to stop getting the change events u need to call SapHookExit.(sapfhook.dll provides these functions)
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How to control and display video from IP camera using ActiveX control over Internet.

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I need to control my IP cameras over the internet. I need to log into the cameras and then display the video. There's an ActiveX control registered on the computer and works fine with IE to access and control the cameras. Controlling the cameras using IE works fairly well, but there are some quirks that I'd like to eliminate by using my own custom code.
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Some example code would be greatly appreciated. Running LabVIEW 2011 on a Win7 32bit. Even some code used to control a similar device using ActiveX over Internet would be helpful.

I have an example vi for interfacing to the foscam activex.
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Attachments:
Foscam Demo.vi ‏24 KB

"the activex control for flash player could not be registered" - Solutions Roundup

I recently ran into this problem on my computer:
http://at32.s3.amazonaws.com/flash_install_problems2.jpg
I am a Flash developer (as in I write SWFs, I don't work for Adobe). and when I updated IE to 10.2, "the activex control for flash player could not be registered". Since I am a developer, I also have Firefox and Chrome installed, with Flash running without problems. For a long time now, Internet Explorer has used a different version (ActiveX) to the other browsers, which use plugins. I am a strong supporter of Flash, it's great to develop with and has a very wide feature set which is growing all the time, unlike fixed technologies/standards. However, the weakest part is the install process - I don't understand why their is a Download Manager. Google Chrome does it's best (so far) by managing the install/update process entirely in the background. Anyway, it was in my best interest to try and get to the bottom of this.
For the record, on the problem machine I have Windows 7 with IE8, but I have seen almost identical symptoms with IE9, Windows XP SP3, as well as various iterations of Flash Player (10.0, 10.1, 10.2 and even some final editions of version 9).
First I tried the standard support here:
http://kb2.adobe.com/cps/191/tn_19166.html
Basically, doing the manual uninstall and manual install of the latest version (without using the download manager, or have IE open). This did not work. I also tried the Microsoft "subinacl" program, together with "reset_fp10.bat". This didn't work either. However, you should try all of these things first before progressing further.
A quick note about people who had tried running the following at a command prompt: "secedit /configure /cfg %windir%\repair\secsetup.inf /db secsetup.sdb /verbose"
I didn't do this, because on investigating further it didn't seem to work with Windows 7, only Windows XP, Windows 2000 or Windows 2003 - though there was a few threads where this had fixed the problem for some users.
For my solution, it is recommended you use the manual uninstall / installers, so you should have them downloaded ready to use.
I then heard about problems with permissions in the registry with the key: HKEY_LOCAL_MACHINE\Software\Classes\shockwaveflash.shockwave
So I opened regedit.exe (start - run - typed "regedit.exe"), navigated to the key and sure enough, I couldn't open it - permission denied - even though I had an administrator account. If for some reason, you can access this key (and any subkeys), then it's likely the following fix will not resolve the problem.
I then done further diagnosis, by using Process Monitor to try and install Flash Player, and I got the following:
http://at32.s3.amazonaws.com/flash_install_problems.gif
This shows all the access denied errors the Flash Player install was experiencing when trying to write to the registry key. This confirmed that this was the problem. I only stress this because several people said it was unwise to tinker with the registry. Though this is common advice, this is the only known fix for this precise problem at present, since you need to manually adjust the permissions yourself. I don't know who is at fault here - Microsoft or Adobe - but let's just get Flash fixed...
The solution:
Firstly, you may want to backup your registry, or the exact key. I didn't do this so I've provided no instructions on how to, but it is recommended for the paranoid. Also make sure as much software is closed down as possible - browsers, IM software, any junk in your system tray. As way of example, I happened to have "BBC iPlayer" installed and running in the background which uses Adobe AIR and Flash Player, so I exited that too.
1) Open regedit (start - run - type "regedit.exe"). You may need to right click on it and select "Run As Administrator", but I didn't as my account was already administrator.
2) Navigate to the key. HKEY_LOCAL_MACHINE\Software\Classes\shockwaveflash.shockwave
Click on it to confirm that you cannot access it (you will get an error) - if their are no problems - this probably isn't the cause of your issues.
3) Right click on it and click Permissions, and ignore any message that may pop up.
4) Under "Group or Usernames" click "Add". Type your account name name, or "Administrators" in the box, then "Check Names" to format it correctly, then Ok.
5) Now on the next screen click the checkbox to enable Full Control (this will also automatically enable "Read" permission too).
6) Click Advanced, then the "Owner" tab at the top. You will see that their is no "Current Owner". This is what we will now fix.
7) Click on your name to change the owner to (I went for Administrators). Also enable the checkbox entitled "Replace Owner on subcontainers and objects". Then click Ok. You will get an error message, which you can try clicking Retry to, but hit Cancel - this is not a problem.
8) Click Ok a couple of times and this part of your registry is now fixed.
9) Now it's a simple case of running the manual Flash uninstall program, then finally the manual Flash installer (for Active X - not the Firefox/Chrome plugin versions). To my surprise, after a couple of days looking into this - I finally had a solution and Flash in IE once more. If you are using Firefox too you may find Flash is no longer installed their (the uninstaller removed it). In this case just install via the Adobe site or try to watch a video on You Tube and you will be prompted or linked to the install.
Hope this provides a good round up of the possible solutions to this problem. Hopefully Microsoft or Adobe can find out what causes this issue in the first place so we don't have to go down this route for much longer. Chrome's implementation of Flash shows how effortlessly things can work!

They will stay on the screen. However, Process Monitor is only intended for advanced users. It is recommended that users try to navigate to the troublesome registry key using regedit, and see if they can access it or not without an error. This is far easier than trying to use Process Monitor, which is very complicated.
I used Process Monitor to confirm that it was just that key which was causing the problem, and not others. Process Monitor is not to be confused with the new Resource Monitor which is accessible via Task Manager in Windows 7 (and possibly Vista). If you must experiment (and Process Monitor is very useful for diagnosing many deep-level problems if you know what you're looking for) Process Monitor can be downloaded from here:
http://technet.microsoft.com/en-us/sysinternals/bb896645
It replaces the older Sysinternals "FileMon" and "RegMon". For those interested in the technical side, I had to setup a number of filters to be able to get the results display as in the screenshot. First of all to just show Registry events. Then to just show events from the manual Flash activeX installer executable. The I added a filter to show only non-successfull results. And finally, for the purposes of the screenshot, added a filter to just show those with "Access Denied", since other non-critical errors are also picked up due to missing keys because installation has not yet been fully completed I guess. When experimenting, most of these filters were applied using the "is not" boolean logic, which will make sense if you experiment with the program.
Without adding any filters, it picks up so many events (hundreds per second) that it's otherwise unusable. e.g. 40,000 events within the first few seconds of opening the program. For this reason, I recommend simply using Regedit to diagnose the problem with the particular Flash registry key.

Video not showing in WMP ActiveX control

Trying to play an MP4 in Windows Media Player and I get a black control and WMP acts as if it is playing. The MP4 does not have audio but other posts have suggested this is not affected by this issue. I have tried all of the various solutions from other posts (converting to WMV, tuning off acceleration, ensuring WMP and refnums are closed properly) and nothing seems to work.
I've been able to get the video to work at times, but after it starts to flake out (black) it never seems to recover. If I recreate the container it always works for at least one play. It does not matter if I allow it to play all the way to the end or click on the control (and stop it via the event case) -- the error can occur either way.
At times I have recieved an error (-2147417846) but this does not seem to be required in order to get the no-video effect (effect happens w/ or w/o the error). I have not been able to track down details on the error but the 750ms delay seems to help with respect to occurence rate.
When I get the black control, the background shows various other video effects both inside and outside of the ActiveX container. See the "while_running.png" attachment. After I stop the VI, the screen looks as in "after_stopping.png". The "after stopping" look persists until I move the screen (and thereby force a redraw) even a little.
I do not recall installing any special CODECs, etc. and the videos all work fine repeatedely in stand-alone WMP.
Running:
Win 7 (32) Home Premium SP1
LV 2011 Pro
WMP 12.0.7601.17514
Attachments:
playMovie.vi ‏22 KB
while_running.png ‏50 KB
after_stoppin.png ‏146 KB

@Norbert - your callback approach allowed the video to play repeatedly on both test machines, however... Once you had me apparently past that hurdle I tried to figure out a way to keep the activeX control from resizing (autozoom to video files native size). I searched through all prop and methods and tried everything I could think of but could not figure it out. Fine, failing that, I tried to set the window size based on the resulting autosized activeX container with the WMP controls cropped ooutside the front panel window. That broke the second playing of the video again.
@Dan - thanks for continuing to look at this. From my perspective, it feels like the bit that gets corrupted (or set-but-then-not-unset-on-exit-of-first-video) has to do with zoom/scaling or aspect ratio, if that helps.
Trying to make progress, and not finding any exposed WMP props for setting the player size in the ActiveX container, I tried loading the WMP inside a web page inside an ActiveX container per http://zone.ni.com/devzone/cda/epd/p/id/4540. This gets me around the uncontrollable autosizing of the original VI (now cotrolled by the HTML layer) and also the no-video issue but introduces a new one -- clicking "stop" on the second-played video often results in a bad refnum passed to the "click" invoke inside the "stop" event case. The VI stops but the video/audio keep going. I thought it might be a reload-from-cache effect so I modified the "modifyHTML" subVI to save to a unique temp html file evey time and pass that path (as string) to the URL property in WMPBrowser -- no effect.

First event fired to event structure

Hi all,
Does anyone know what's the first event being fired to the event structure on VI startup? I set a breakpoint on the event structure and it breaks. However i wasn't able to capture whats the event.
My intention was simple; i have a table which list all the IO names and values. So during VI startup, i wan to populate the IO names first. Then in a timed-loop, the values are updated respectively. In this case, i don't need to "refresh" the table every time which waste time and resources.
It something like the OnLoad event.
Another way out is to register an user event, and have this event fired during application startup. But i wonder if anyone has a better way?
Many thanks!

j3r3mi wrote:
My intention was simple; i have a table which list all the IO names and values. So during VI startup, i wan to populate the IO names first. Then in a timed-loop, the values are updated respectively. In this case, i don't need to "refresh" the table every time which waste time and resources.
Why don't you show us some code.
Are the IO name static for the duration of the program? Are you using a regular table column or the "row header strings []" property for the IO names?
If you want to write the row headers at the start of the program, place the code before the main loop containing the event structure. No event case needed. If you have a specific event to update the table headers if needed, fire the event once at startup using a signaling value property, again with the property node placed before the main loop.
LabVIEW Champion . Do more with less code and in less time .

Capturing events fired by ACtiveX control

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