Disallow sleep while application is running

main.go

@@ -98,6 +98,7 @@ var (
 func main() {
 	checkDebugParam()
 	loaded := loadSettings()
+	preventSleep()
 
 	window := g.NewMasterWindow("Anime4K-GUI", 1600, 950, g.MasterWindowFlagsNotResizable)
 	searchHardwareAcceleration()

sleep.go

@@ -0,0 +1,27 @@
+package main
+
+import (
+	"fmt"
+	"syscall"
+)
+
+var (
+	kernel32                    = syscall.NewLazyDLL("kernel32.dll")
+	procSetThreadExecutionState = kernel32.NewProc("SetThreadExecutionState")
+)
+
+const (
+	ES_CONTINUOUS       = 0x80000000
+	ES_SYSTEM_REQUIRED  = 0x00000001
+	ES_DISPLAY_REQUIRED = 0x00000002
+)
+
+func preventSleep() {
+	ret, _, err := procSetThreadExecutionState.Call(
+		uintptr(ES_CONTINUOUS | ES_SYSTEM_REQUIRED | ES_DISPLAY_REQUIRED),
+	)
+
+	if ret == 0 {
+		logMessage(fmt.Sprintf("Failed to block sleep/hibernation: %v\n", err), false)
+	}
+}