pot-app/pot-desktop · error

Get Cache Dir Failed

Error message

Get Cache Dir Failed

What it means

In the screenshot command, dirs::cache_dir() returned None and .expect('Get Cache Dir Failed') panicked. cache_dir() yields None when the OS provides no cache directory (e.g. missing/invalid XDG_CACHE_HOME on Linux, or unavailable user profile on Windows), so no path exists where the screenshot cut image can be stored.

Source

Thrown at src-tauri/src/screenshot.rs:16

use log::info;

#[tauri::command]
pub fn screenshot(x: i32, y: i32) {
    use crate::APP;
    use dirs::cache_dir;
    use screenshots::{Compression, Screen};
    use std::fs;
    info!("Screenshot screen with position: x={}, y={}", x, y);
    let screens = Screen::all().unwrap();
    for screen in screens {
        let info = screen.display_info;
        info!("Screen: {:?}", info);
        if info.x == x && info.y == y {
            let handle = APP.get().unwrap();
            let mut app_cache_dir_path = cache_dir().expect("Get Cache Dir Failed");
            app_cache_dir_path.push(&handle.config().tauri.bundle.identifier);
            if !app_cache_dir_path.exists() {
                // 创建目录
                fs::create_dir_all(&app_cache_dir_path).expect("Create Cache Dir Failed");
            }
            app_cache_dir_path.push("pot_screenshot.png");

            let image = screen.capture().unwrap();
            let buffer = image.to_png(Compression::Fast).unwrap();
            fs::write(app_cache_dir_path, buffer).unwrap();
            break;
        }
    }
}

View on GitHub (pinned to 594d32ede9)

Solutions

1. Ensure the environment provides a cache dir (set XDG_CACHE_HOME/HOME correctly on Linux; check user profile on Windows)
2. Fall back to std::env::temp_dir() when cache_dir() is None instead of panicking
3. Convert the command to return Result and report the failure to the frontend rather than crashing the process

When it happens

Trigger: Thrown at src-tauri/src/screenshot.rs:16 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of pot-app/pot-desktop@594d32ede9 (2026-09-02). Data as JSON: /api/errors/315d203108e2a542. Report an issue: GitHub.