Initial GoWallpaper implementation

2026-07-31 21:25:56 +08:00
commit 1a4bb858f3
18 changed files with 1432 additions and 0 deletions
@@ -0,0 +1,39 @@
+//go:build windows
+
+package main
+
+import (
+	"errors"
+	"unsafe"
+
+	"golang.org/x/sys/windows"
+)
+
+const instanceMutexName = `Local\GoWallpaper-4F831CA6-6890-4D95-91A3-A819D7F29718`
+
+func acquireSingleInstance() (windows.Handle, bool, error) {
+	name, err := windows.UTF16PtrFromString(instanceMutexName)
+	if err != nil {
+		return 0, false, err
+	}
+	handle, err := windows.CreateMutex(nil, false, name)
+	if errors.Is(err, windows.ERROR_ALREADY_EXISTS) {
+		return handle, true, nil
+	}
+	if err != nil {
+		return 0, false, err
+	}
+	return handle, false, nil
+}
+
+func showNativeMessage(title, message string) {
+	titlePtr, _ := windows.UTF16PtrFromString(title)
+	messagePtr, _ := windows.UTF16PtrFromString(message)
+	procMessageBoxW := user32.NewProc("MessageBoxW")
+	procMessageBoxW.Call(
+		0,
+		uintptr(unsafe.Pointer(messagePtr)),
+		uintptr(unsafe.Pointer(titlePtr)),
+		0x00000040,
+	)
+}