Error with mobiledev object;

Question

政博 2025-5-9

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2177024-error-with-mobiledev-object

编辑： Hitesh 2025-5-15

Hi:

clc
clear
mobiledevlist
m=mobiledev;
delete(m);
clear mobiledev;

this is my code , in mobiledevlist it shows i have been connected with my device ,but i can find any object to get data from it ,

when run at "m=mobiledev",it occurs "Connection to this device already exists in the workspace."

did it occur by my device status is Connected ?

Thanks !

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Answer 1

Hitesh 2025-5-12

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Hi 政博,

I'm not sure why you're still encountering this error even after removing the "mobiledev" object from the workspace. Start a fresh MATLAB session so that there won't be any existing object of "mobiledev" in the memory.To resolve the issue, please try deleting the object at the end of your script. B

If you are creating the "mobiledev" object as follows

m=mobiledev;

then, after using the object for your subsequent operations at the end of the script, add the below command to delete the object.

delete(m);

This will help us to destroy the object and the existing connection. Then, it will not be required to reopen MATLAB session.

clear all;

Please do let me know in case the issue persist.

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政博 2025-5-15

编辑：政博 2025-5-15

I think there might be a way to check if your device has been connected , in your mobile clinet ,the sensor panel will show something like waiting matlab to creat mobiledev object ,if it happend on your client but you can't find any object in your matlab ,I think trying reboot your PC and matlab may help you ?

Hitesh 2025-5-15

编辑：Hitesh 2025-5-15

Hi Walter,

You’re correct that the documentation mentions using "clear" on the mobileDev() object. However, I suspected that calling "clear" doesn’t actually delete the object, which is why we were seeing the error: "Connection to this device already exists in the workspace." I checked the MATLAB documentation and found that the object can be deleted using the "delete" function.

https://www.mathworks.com/help/matlab/ref/delete.html

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