topic Re: Windows Message Queue 64-Bit Support in LabVIEW

Windows Message Queue 64-Bit Support

Hooovahh — Thu, 18 Dec 2025 00:23:06 GMT

Just wondering if the Windows Message Queue will ever be updated to support 64-bit Windows? It is some really neat low level tools on windows but only works fully in 32 bit Windows.

I'm looking to detect when a window is resized, or has a mouse down event, based on its HWND not VI reference. This is very easy to do with this library if you don't use 64 bit Windows. Any other tips on accomplishing this is appreciated.

EDIT: Attatched is a VI that runs in LabVIEW 2011 32 bit. On Windows 7 64-bit the "WM_Size" is not generated when the panel is resized. The mouse event does get generated for some reason. (this VI relies on VIs in the library linked earlier)

Re: Windows Message Queue 64-Bit Support

Emily-C — Thu, 18 Dec 2025 00:23:46 GMT

Hi Hoovah,

I'm glad to see you like the low level tools offered by the Windows Message Queue library! Unfortunately, we don't know ahead of time what new libraries will be released. I can't offer any timeline for if the library will ever be supported in 64-bit Windows.

Have you worked with Event-Driven Programming in LabVIEW before? There are event options for mouse events, as well as a Pane Size Event. You could use an event structure and a few different events to create an application that would react to mouse movements and window resizing.

I hope this helps!

Re: Windows Message Queue 64-Bit Support

Hooovahh — Mon, 06 May 2013 20:56:57 GMT

Yes I'm familiar with Event Driven architectures but in my post I explicitly mentioned how I wanted to reference a window by HWND and not VI Reference. But also there user events and dynamic registering of events do not replacte all the functionality in this library. The obvious one is the mouse scroll event. In LabVIEW the only thing that can be done is polling the mouse every x number of milliseconds to see if the scroll happened.

Re: Windows Message Queue 64-Bit Support

Emily-C — Tue, 07 May 2013 14:40:00 GMT

Hi Hoovah,

I'm sorry, I saw that you said you would like to use HWND, but since that library isn't supported in Windows 64 bit I was trying to offer a possible work-around. I understand that the LabVIEW events can't do exactly what the Windows Message Queue library can, but if you give me more information we can try to make them work for your application. Are you running into specific issues in your application where LabVIEW events don't meet your needs?

As well, the underlying DLL code is offered on our website for the Windows Message Queue Library. If you are comfortable in C++, you could try to modify the DLL to offer the functions you need.

Please let me know if I can offer any further assistance. Thanks,

Re: Windows Message Queue 64-Bit Support

Hooovahh — Tue, 07 May 2013 21:35:16 GMT

@Emily-C wrote:

Hi Hoovah,

Are you running into specific issues in your application where LabVIEW events don't meet your needs?

Yes specifically when it is not a LabVIEW front panel that I am trying to detect changes to. I would like to be able to detect when a window is resized like Notepad. Something not LabVIEW. This is possible with the Windows Message Queue Library but not with LabVIEW events.

I think I may have a solution anyway and I'll need more time to test, but I can put this other window (Notepad for example) into a VI, then remove the ability to resize Notepad, but instead resize Notepad when the VI it is in gets resized. Then I can detect when the window is resized because I can be detecting a Panel Size? event (or Pane) on the VI that Notepad is in. This is alot of extra headache and things to keep track of but do able. But this also adds other flexibilities that I think I may prefer.

Re: Windows Message Queue 64-Bit Support

zou — Tue, 07 May 2013 23:31:28 GMT

Use a .net text box. It's similar to Notepad.

Re: Windows Message Queue 64-Bit Support

Hooovahh — Wed, 08 May 2013 12:33:35 GMT

@zou wrote:

Use a .net text box. It's similar to Notepad.

Thanks for the tip, but Notepad was just an example. What about the DMM Soft Front Panel? or Excel? Or MSPaint? Skype? Task Manager? 7-Zip? Explorer Window? Calculator?

Using this library it is easy to know when any window in the system is resized, or had any other event take place that is supported by it.

Re: Windows Message Queue 64-Bit Support

Emily-C — Wed, 08 May 2013 15:27:23 GMT

Hi Hooovahh,

Thank you for your feedback. Unfortunately at this point in time I can't offer a workaround that will do exactly what you want in 64 bit. If you're interested in seeing this in the future, please post a suggestion on the Idea Exchange: http://forums.ni.com/t5/ideas/v2/ideaexchangepage/blog-id/labviewideas

Thank you,

Re: Windows Message Queue 64-Bit Support

domasm — Tue, 17 Feb 2015 19:43:34 GMT

For anyone interested in this I posted 32-bit and 64-bit version of this library here

Re: Windows Message Queue 64-Bit Support

JÞB — Tue, 17 Feb 2015 20:06:42 GMT

@domasm wrote:

For anyone interested in this I posted 32-bit and 64-bit version of this library here

That's a nice library. Kudos

Re: Windows Message Queue 64-Bit Support

Marco_Ge — Tue, 22 Nov 2016 10:07:59 GMT

Hallo, the link is not working any more. How is it possible to download the updated library? Many thanks.

Re: Windows Message Queue 64-Bit Support

Domas — Tue, 22 Nov 2016 18:12:36 GMT

Link is correct, the same link comes up in NI search. I have checked cached copy by Google, but the link to zip file isn't working either. Basically it looks like NI Community pages are having big issues. Here is direct link to my dropbox.. Hope it's the last version. Please be aware that I made complete switch to C# and do not develop/maintain this library anymore.

Re: Windows Message Queue 64-Bit Support

Domas — Tue, 22 Nov 2016 18:14:44 GMT

Looks like I have multiple accounts or whatever, never mind.

Re: Windows Message Queue 64-Bit Support

Marco_Ge — Wed, 23 Nov 2016 08:10:59 GMT

Thank you Domas for your kind and fast reply.

I've downloaded it and I'm going to include your library into my project.

Have a nice day.

Marco

Re: Windows Message Queue 64-Bit Support

qpais — Thu, 18 May 2017 09:18:47 GMT

hey,

can anybody please re-upload the 64-bit library?

both the DOC link as well as the dropbox link dont work anymore.

many thanks in advance!

Re: Windows Message Queue 64-Bit Support

Domas — Fri, 19 May 2017 16:31:17 GMT

new dropbox link

First time it was NI that broke stuff, now dropbox ended support for public folders.

Re: Windows Message Queue 64-Bit Support

Hooovahh — Tue, 22 Jan 2019 13:57:46 GMT

Is there a reason the zip isn't just attached here? I've downloaded the zip from your dropbox and have attached it. When searching for this topic in Google this thread is one of the first ones, after the older 32 bit only one of course.

Re: Windows Message Queue 64-Bit Support

Intaris — Thu, 12 Dec 2019 10:36:53 GMT

~~Nevermind~~

Re: Windows Message Queue 64-Bit Support

madview — Wed, 02 Feb 2022 12:09:56 GMT

Hi Hooovahh,

I'm trying to register for event 0x0219 WM_DEVICECHANGE but it doesn't seem to work. Any idea?
Thanks in advance for your help.

Re: Windows Message Queue 64-Bit Support

Hooovahh — Wed, 02 Feb 2022 14:24:15 GMT

I didn't develop this code I just reattached the post by Domas. My knowledge on these type of subjects is limited and I wouldn't know how to help.