dzmitry-savitski · November 11, 2025 13:03 · Nov 11, 2025
diff --git a/app.js b/app.js
@@ -0,0 +1,28 @@
+const ffi = require("ffi-napi");
+
+// DWORD SetThreadExecutionState(EXECUTION_STATE esFlags);
+const kernel32 = ffi.Library("kernel32", {
+  SetThreadExecutionState: ["uint", ["uint"]],
+});
+
+// Flags from Win32 API
+const ES_CONTINUOUS      = 0x80000000;
+const ES_DISPLAY_REQUIRED = 0x00000002; // keep screen on
+// Optional: const ES_SYSTEM_REQUIRED = 0x00000001; // keep system awake
+
+function keepAwake() {
+  const r = kernel32.SetThreadExecutionState(ES_CONTINUOUS | ES_DISPLAY_REQUIRED);
+  if (r === 0) throw new Error("SetThreadExecutionState failed");
+}
+
+function clearAwake() {
+  // Clears previous request for this thread
+  kernel32.SetThreadExecutionState(ES_CONTINUOUS);
+}
+
+process.on("SIGINT", () => { clearAwake(); process.exit(0); });
+process.on("exit", clearAwake);
+
+keepAwake();
+console.log("Display will be kept on. Press Ctrl+C to stop.");
+setInterval(() => {}, 1 << 30);
diff --git a/app.py b/app.py
@@ -0,0 +1,23 @@
+import ctypes, atexit
+
+# DWORD SetThreadExecutionState(EXECUTION_STATE esFlags);
+kernel32 = ctypes.WinDLL("kernel32", use_last_error=True)
+SetThreadExecutionState = kernel32.SetThreadExecutionState
+SetThreadExecutionState.argtypes = [ctypes.c_uint]
+SetThreadExecutionState.restype  = ctypes.c_uint
+
+ES_CONTINUOUS       = 0x80000000
+ES_DISPLAY_REQUIRED = 0x00000002
+# Optional: ES_SYSTEM_REQUIRED = 0x00000001
+
+def keep_awake():
+    r = SetThreadExecutionState(ES_CONTINUOUS | ES_DISPLAY_REQUIRED)
+    if r == 0:
+        raise ctypes.WinError(ctypes.get_last_error())
+
+def clear_awake():
+    SetThreadExecutionState(ES_CONTINUOUS)
+
+atexit.register(clear_awake)
+keep_awake()
+input("Display is kept on. Press Enter to release and exit...")
No results found