rdev breaks the app on key press

[HuakunShen]

I read this discussion but my problem is different. #7752

I am using MacOS and rdev 0.5.3, trying to listen to key press events.

If I run the listen function in tauri::async_runtime::spawn(async move ..., only mouse move events are printed out.
Whenever I press a key, the program will exit (exit code is 0 by echo $?).

If I run the listener without async runtime, which will block setup function, the listener works for key presses and won't exit, but the tauri app is not usable as setup() never finishes.

[HuakunShen]

I tried the same code on windows and Ubuntu 20.04, everything works fine. I also tried the code in a fresh MacOS VM but it quits whenever a key is pressed.

Pretty sure it's some problem only on Mac.
Any suggestion?

[zengkaiwen]

I have the same problem 😣，have you solved it?

[HuakunShen]

Not yet, no clue where the bug is from, there is no error message.

[NotAJocke]

Same problem here, macos and rdev too

[helbing]

Same issue in macOS Sonoma. I found that rustdesk use this repo to solve it, and it can work.

[HuakunShen]

Same issue in macOS Sonoma. I found that rustdesk use this repo to solve it, and it can work.

@helbing Thanks!

I tried this it works on Mac.

rdev = { git = "https://github.com/fufesou/rdev" }

If I use a tag from https://github.com/fufesou/rdev/tags 0.3.6 (latest tag in 2020), it still fails. Make sure to use the git url directly.

[AlexKnauth]

Do you have any idea what code change or which commit in the https://github.com/fufesou/rdev or https://github.com/rustdesk-org/rdev repository fixed this issue?

[HuakunShen]

@AlexKnauth No, to find the commit I am afraid you have to do a binary search on the commit history. I haven't done it.

[AlexKnauth]

I found where the crash was coming from, and I think I've found a fix: Narsil/rdev#147, inspired by what https://github.com/fufesou/rdev and https://github.com/rustdesk-org/rdev have done.

[HuakunShen]

Cool! What did you fix?

[sincekmori]

I hit this same crash and this thread was one of the few places discussing it, so let me pay back with what I've learned since.

The root cause was eventually tracked down by @AlexKnauth in Narsil/rdev#147: calling listen off the main thread needs set_is_main_thread(false). So the fufesou/rdev git workaround isn't necessary anymore, though the fix still isn't released on crates.io, so you need a git dependency on Narsil/rdev main instead.

Also, if the reason you're listening for keys is a copy or clipboard workflow (it was for me), there's a way out that avoids rdev on macOS entirely: a listen-only CGEventTap on the main run loop, with the main-thread-only pasteboard and window calls hopped over via libdispatch. I ended up packaging that as copycopy after debugging this. It starts from Tauri's setup() and hands you clipboard content plus foreground app info on a worker thread.