launch application and gets its pid - rust

readme.md

this isn't working as execpted:

first of all it isn't returning the pid of apps lauched uwp apps & for some apps its returing a pid but the pid is not valid

when lauching whatsapp (installed from microsoft store):

exew.rs

// it's an example file 
use windows::{
    core::PCWSTR,
    Win32::{
        Foundation::{CloseHandle, HWND, HANDLE},
        UI::Shell::{
            ShellExecuteExW, SHELLEXECUTEINFOW, SEE_MASK_NOASYNC, SEE_MASK_NOCLOSEPROCESS,
        },
        System::Threading::GetProcessId,
        UI::WindowsAndMessaging::SW_SHOWNORMAL,
    },
};
use tracing::Level;
use windows::Win32::System::Registry::HKEY;
use windows::Win32::Foundation::HINSTANCE;

fn launch_app(app_id: &str) -> Result<u32, String> {

    let app_id_wide: Vec<u16> = app_id.encode_utf16().chain(Some(0)).collect();
    let operation_wide: Vec<u16> = "open".encode_utf16().chain(Some(0)).collect();

    let mut exec_info = SHELLEXECUTEINFOW {
        cbSize: std::mem::size_of::<SHELLEXECUTEINFOW>() as u32,
        fMask: SEE_MASK_NOASYNC | SEE_MASK_NOCLOSEPROCESS,
        hwnd: HWND(std::ptr::null_mut()),
        lpVerb: PCWSTR(operation_wide.as_ptr()),
        lpFile: PCWSTR(app_id_wide.as_ptr()),
        lpClass: PCWSTR::null(),
        lpIDList: std::ptr::null_mut(),
        lpParameters: PCWSTR::null(),
        lpDirectory: PCWSTR::null(),
        hkeyClass: HKEY(std::ptr::null_mut()),
        hInstApp: HINSTANCE(std::ptr::null_mut()),
        dwHotKey: 0,
        Anonymous: Default::default(),
        nShow: SW_SHOWNORMAL.0,
        hProcess: HANDLE(std::ptr::null_mut()),
    };

    let _ = unsafe { ShellExecuteExW(&mut exec_info).map_err(|e| println!("failed: {:?}", e)) };

    let h_process: HANDLE = exec_info.hProcess;

    if h_process.is_invalid() {
        return Err("No process handle returned".to_string());
    }

    let pid = unsafe { GetProcessId(h_process) };

    unsafe { let _ = CloseHandle(h_process); };

    if pid == 0 {
        Err("Failed to get process ID".to_string())
    } else {
        Ok(pid)
    }
}

#[tokio::main]
async fn main() -> Result<(), String> {
    tracing_subscriber::fmt::Subscriber::builder()
        .with_max_level(Level::DEBUG)
        .init();


    // let app_id = "shell:AppsFolder\\5319275A.WhatsAppDesktop_cv1g1gvanyjgm!App";
    // let app_id = "shell:AppsFolder\\TelegramMessengerLLP.TelegramDesktop_t4vj0pshhgkwm!Telegram.TelegramDesktop.Store";
    // let app_id = "shell:AppsFolder\\308046B0AF4A39CB;PrivateBrowsingAUMID";
    // let app_id = "shell:AppsFolder\\308046B0AF4A39CB";
    let app_id = "shell:AppsFolder\\MSEdge";
    let result = launch_app(app_id);
    println!("pid: {:?}", result);


    Ok(())
}