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Labview 2012 and DDE

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I found this thread and thought that if someine needs a dde.dll in 2012 LV version he may stick to the same problem with the code interface node that I am trying to solve, so I will just put a link to my post here.


thanks for help

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Message 11 of 16

Sorry if this sounds like a strange question but I came across this thread as I am trying to use DDE in a project I have. My question is, why is the DDE llb not included in the 64bit version of the software?

Is DDE supported in 64bit windows?





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Message 12 of 16

DDE is not supported in 64-bit LabVIEW editions. This is because all .dll's being called must match the "bitness" of the calling application. Unfortunately, the underlying Microsoft .dll is 32-bit.


Because of some emulation protocols that happen with the windows OS, however, you are able to run the 32-bit version of LabVIEW and make calls to DDE. You are also able to install 32-bit and 64-bit instances of LabVIEW simultaneously, but they are not inter-operable.

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Message 13 of 16

I know this is an extremely old topic, but based on the rationale that it is easier to find if everything is kept together, I needed to use DDE to interface with some hardware (a Quizix pump), but wanted to use LabVIEW 64-bit, so I developed a vi to do it, which I'm uploading in case it saves others some time.


As far as I can tell, for that which I've implemented, it is near identical to how dde.lib that is bundled with LabVIEW 32-bit operates. I didn't replicate all the functionality of dde.lib as I didn't need it in my application, yet perhaps, if nothing else, it will still act as a useful starting point. I developed the vi in LabVIEW 2019, it just demonstrates how to achieve certain functionalities, and, in principle, should also work with LabVIEW 32-bit (albeit probably I'd just use dde.lib bundled with LabVIEW 32-bit in that case).

Message 14 of 16

I've attached an updated vi that adds a proof-of-concept of the execute transaction and fixes a few issues I discovered. At this point it seems that to get any additional functionality that is also part of LabVIEW 32-bit's dde.lib would require a callback function, which LabVIEW doesn't support.

Message 15 of 16



Thank you so very much for sharing this! You've saved us days (or weeks?) of work, and, quite possibly, the cost of replacement equipment down the line. 


C. R. 

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Message 16 of 16