diff -ur jna-3.0.4-svn729/src/com/sun/jna/Function.java jna-3.0.4-svn729.orig/src/com/sun/jna/Function.java
--- jna-3.0.4-svn729/src/com/sun/jna/Function.java	2008-09-12 10:05:07.000000000 -0400
+++ jna-3.0.4-svn729.orig/src/com/sun/jna/Function.java	2008-10-01 23:23:38.000000000 -0400
@@ -12,6 +12,7 @@
 
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
+import java.lang.reflect.Array;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
@@ -351,16 +352,41 @@
         }
         return result;
     }
+
+    private Class primitiveFromBoxed(Class boxedClass) {
+	if (boxedClass.isPrimitive())
+	    return boxedClass;
+	if (boxedClass == Boolean.class)
+	    return Boolean.TYPE;
+	if (boxedClass == Byte.class)
+	    return Byte.TYPE;
+	if (boxedClass == Character.class)
+	    return Character.TYPE;
+	if (boxedClass == Short.class)
+	    return Short.TYPE;
+	if (boxedClass == Integer.class)
+	    return Integer.TYPE;
+	if (boxedClass == Long.class)
+	    return Long.TYPE;
+	if (boxedClass == Float.class)
+	    return Float.TYPE;
+	if (boxedClass == Double.class)
+	    return Double.TYPE;
+	return boxedClass;
+    }
     
     private Object convertArgument(Object[] args, int index, Method invokingMethod, TypeMapper mapper) { 
         Object arg = args[index];
         if (arg != null) {
             Class type = arg.getClass();
             ToNativeConverter converter = null;
+	    boolean isArray = false;
             if (NativeMapped.class.isAssignableFrom(type)) {
                 converter = NativeMappedConverter.getInstance(type);
-            }
-            else if (mapper != null) {
+            } else if (NativeMapped[].class.isAssignableFrom(type)) {
+		isArray = true;
+                converter = NativeMappedConverter.getInstance(type.getComponentType());
+	    } else if (mapper != null) {
                 converter = mapper.getToNativeConverter(type);
             }
             if (converter != null) {
@@ -371,7 +397,15 @@
                 else {
                     context = new FunctionParameterContext(this, args, index);
                 }
-                arg = converter.toNative(arg, context);
+		if (isArray) {
+		    NativeMapped[] nativeArg = (NativeMapped[]) arg;
+		    /* Reassign arg here to a new array */
+		    arg = Array.newInstance(primitiveFromBoxed(converter.nativeType()), nativeArg.length);
+		    for (int i = 0; i < nativeArg.length; i++)
+			Array.set(arg, i, converter.toNative(nativeArg[i], context));
+		} else {
+		    arg = converter.toNative(arg, context);
+		}
             }
         }
         if (arg == null || isPrimitiveArray(arg.getClass())) { 
Only in jna-3.0.4-svn729.orig/src/com/sun/jna: Function.java~