Object CreateObje​ct("MATLAB​.applicati​on") used in VBS script have different behaviours on 2 PCs

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Alexandre
Alexandre 2022-2-23
回答： Alexandre 2022-3-2
Hi,
I have a working VBS script that does not give me the same results on 2 different PCs which seems to have the same MATLAB configuration. Here are the order of operations:
I open a Simulink model manually, which launches a desktop MATLAB 2015b (8.6) instance. Then I start my VBS script from Windows explorer. This script first lines are :
Set ml = CreateObject("MATLAB.application")
ml.Execute("test123=1;"))
On PC #1, since I already have an instance of MATLAB running, my object ml is directly connected to this instance and I can see the variable "test123" in my workspace. If no MATLAB.exe process is running and I start the VBS script, I have a new command window instance that opens. That is what I expect.
On PC #2, I just can't connect to my existing MATLAB desktop instance. Instead, a new command window instance is created each time.
Here are the relevant differences between the two PCs :
  • PC #1 only has MATLAB 2015b installed and PC #2 has MATLAB 2011, 2014b and 2015b installed. I thought this was the problem so I changed the first line of my script to Set ml = CreateObject("MATLAB.application.8.6") to eliminate that possible problem. No success with that.
  • PC #1 is a fresh PC with not a lot of things installed on it and PC #2 has a lot of stuff installed.
Is there something I need to add in my script to differentiate "link to an existing MATLAB instance" from "create a new MATLAB instance" ?
Thanks a lot.

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回答（1 个）

Alexandre
Alexandre 2022-3-2
I finally found a solution but I unfortunately can't explain it. I discovered that the PC where I run my script is not important. How my MATLAB instance was launched is important.
I open my model from a third party software (RT-LAB from Opal-RT Technologies) and this software makes the MATLAB instance controllable from a script that is executed later. That is my solution.
I tried to retro-engineer how it is done but I couldn't. The only information I have is the command line from task manager:
I thought the important thing was "-desktop -MLAutomation -desktop -r" but it seems that the software does other things in the background with a temporary file. I found the temporary file and it was empty or maybe it's just encrypted. If I execute the exact same command line outside of the software environment, I get a regular MATLAB instance that I can't control with my script.
That only proves that executing script from command line to existing MATLAB instance is not impossible but pretty complex.
If anybody was ever able to launch a controllable MATLAB instance, please share it here.
Thank you!

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