Rainmeter crashes after unloading of skin with this plugin

[d-uzlov]

How to reproduce:
Load 2 skins with AppVolumePlugin (for example, 2 instances of your example skin), unload 1 of them.

Are you sure that you want to release static field "pEnumerator" on every parent measure unload?

AppVolumePlugin/AppVolume/AppVolume.cpp

Line 45 in a196e92

SAFE_RELEASE(pEnumerator);

Null pointer dereferencing is probably the cause of the crash because static pEnumerator is null after unloading of a skin containing this plugin. Maybe it should not be static?

Also, although this is not directly related to the issue, I think that CoCreateInstance() in InitializeCOM() leads to memory leak because if pEnumerator is initialized it is not released before second initialization.
Another memory leak is probably happening because CoUninitialize should be called for every successful CoInitialize but now you call it only once per plugin lifetime.

[khanhas]

Thank you for taking time reading the code! I really appreciate it.
And you're right, I shouldn't release device enumerator in measure destructor. It will be released when no parent measure is loaded (parentCollection.size() == 0).
I also added nullptr check before CoCreateInstance.
Download new version here: https://github.com/khanhas/AppVolumePlugin/releases/tag/1.2.1

[d-uzlov]

Thank you for taking time reading the code!

I'm glad to help!

Download new version here

Unfortunately, I can't start Rainmeter with this version. It crashes before first redraw cycle.

P.S. Sorry for reporting random issues in this thread, but I noticed that field "LegalCopyright" in your dlls contain "??" instead of "©" for me, while all other plugins I have shows ©.

[khanhas]

Haha, I made a mistake.
I checked pEnumerator != nullptr instead of == nullptr
Fixed: https://github.com/khanhas/AppVolumePlugin/releases/tag/1.2.2

About the copyright symbol, I used speaker emoji instead of © so it's maybe not available in your system.
Are you using Windows 7? Since if you use Windows 10, it will show like this:

Eh, maybe I should change to © in next patch

[d-uzlov]

Now everything works as intended.
Thank you for quick response.

[d-uzlov]

Are you using Windows 7

No, I'm using win10. I think that it can be related to default charset: I use cp1251. But I thought that Unicode is used for this (and two question mark suggests that something like utf-16 is used).
Maybe the problem is that I don't have this emoji? I don't use them, so I don't know if they work correctly on my machine.

[d-uzlov]

Ok, I think I found the issue with this symbol. I used different software for checking this information (plugin for total commander), and it apparently can't render emojis. Rainmeter and explorer show it as in your screenshot. Sorry for false report.