Ensure UTF-8 encoding for JNA string marshaling in Windows tray structures and library initialization

Author: kdroidFilter

src/commonMain/kotlin/com/kdroid/composetray/lib/windows/WindowsNativeTray.kt

@@ -6,6 +6,16 @@ import com.sun.jna.win32.StdCallLibrary
 
 @Structure.FieldOrder("icon_filepath", "tooltip", "cb", "menu")
 internal class WindowsNativeTray : Structure() {
+    companion object {
+        init {
+            // Ensure UTF-8 encoding for JNA string marshaling before any structure write
+            val key = "jna.encoding"
+            if (System.getProperty(key).isNullOrBlank()) {
+                System.setProperty(key, "UTF-8")
+            }
+        }
+    }
+
     @JvmField
     var icon_filepath: String? = null
 

src/commonMain/kotlin/com/kdroid/composetray/lib/windows/WindowsNativeTrayLibrary.kt

@@ -9,6 +9,13 @@ import com.sun.jna.win32.StdCallLibrary
 // This object registers the native library and exposes external (native) methods.
 internal object WindowsNativeTrayLibrary : StdCallLibrary {
     init {
+        // Ensure JNA marshals Java/Kotlin strings as UTF-8. This must be set
+        // before the first interaction with JNA/native code, otherwise JNA will
+        // default to the system ANSI code page on Windows and corrupt Unicode.
+        val key = "jna.encoding"
+        if (System.getProperty(key).isNullOrBlank()) {
+            System.setProperty(key, "UTF-8")
+        }
         // Register the native library "tray" for direct calls
         Native.register("tray")
     }

src/commonMain/kotlin/com/kdroid/composetray/lib/windows/WindowsNativeTrayMenuItem.kt

@@ -5,6 +5,16 @@ import com.sun.jna.Structure
 
 @Structure.FieldOrder("text", "icon_path", "disabled", "checked", "cb", "submenu")
 internal open class WindowsNativeTrayMenuItem : Structure() {
+    companion object {
+        init {
+            // Ensure UTF-8 encoding for JNA string marshaling as early as possible
+            val key = "jna.encoding"
+            if (System.getProperty(key).isNullOrBlank()) {
+                System.setProperty(key, "UTF-8")
+            }
+        }
+    }
+
     @JvmField
     var text: String? = null