initial commit

src/features/empty_session.rs

@@ -0,0 +1,60 @@
+use crate::gui::App;
+use std::time::{Duration, Instant};
+use sysinfo::System;
+use windows::Win32::{
+    Foundation::{HANDLE, NTSTATUS},
+    System::Threading::{OpenProcess, PROCESS_SUSPEND_RESUME},
+};
+
+pub const INTERVAL: Duration = Duration::from_secs(10);
+const ENHANCED: &str = "GTA5_Enhanced.exe";
+const LEGACY: &str = "GTA5.exe";
+
+pub struct EmptySession {
+    pub enabled: bool,
+    pub interval: Instant,
+}
+
+impl Default for EmptySession {
+    fn default() -> Self {
+        Self {
+            enabled: true,
+            interval: Instant::now(),
+        }
+    }
+}
+
+#[link(name = "ntdll")]
+unsafe extern "system" {
+    pub unsafe fn NtSuspendProcess(ProcessHandle: HANDLE) -> NTSTATUS;
+    pub unsafe fn NtResumeProcess(ProcessHandle: HANDLE) -> NTSTATUS;
+}
+
+fn get_gta_pid(sysinfo: &mut System) -> u32 {
+    sysinfo.refresh_all();
+    if let Some((pid, _)) = sysinfo
+        .processes()
+        .iter()
+        .find(|(_, p)| p.name() == ENHANCED || p.name() == LEGACY)
+    {
+        return pid.as_u32();
+    };
+    u32::MAX
+}
+
+pub fn activate(app: &mut App) {
+    let pid = get_gta_pid(&mut app.sysinfo);
+    if pid == u32::MAX {
+        return;
+    }
+    unsafe {
+        app.game_handle = OpenProcess(PROCESS_SUSPEND_RESUME, false, pid).unwrap();
+        let _ = NtSuspendProcess(app.game_handle);
+    }
+}
+
+pub fn deactivate(app: &mut App) {
+    unsafe {
+        let _ = NtResumeProcess(app.game_handle);
+    }
+}