Dear Matt Could you give me some advice which part should I change to support UNIX_FD in dbus java. I'd like to spend some time to implement it. I debug the code. Here is the result. 1. Call a method which the return value is UNIX_FD 2. In MessageReader.readMessage() method, the input stream read buf[1] is 3 which means the type of read message is Error. I guess I have to put something in the out Message before I read the return to support UNIX_FD. What should I do? I create a class named UNIX_FD and the signature is 'h'. Here is the java code. public class UnixFD extends Number implements Comparable<UnixFD>{         /** Maximum allowed value */            public static final long MAX_VALUE = 4294967295L;            /** Minimum allowed value */            public static final long MIN_VALUE = 0;            private long value;            /** Create a UnixFD from a long.             * @param value Must be a valid integer within MIN_VALUE&ndash;MAX_VALUE             * @throws NumberFormatException if value is not between MIN_VALUE and MAX_VALUE             */            public UnixFD(long value)            {               if (value < MIN_VALUE || value > MAX_VALUE)                  throw new NumberFormatException(MessageFormat.format(_("{0} is not between {1} and {2}."), new Object[] { value, MIN_VALUE, MAX_VALUE}));               this.value = value;            }            /** Create a UnixFD from a String.             * @param value Must parse to a valid integer within MIN_VALUE&ndash;MAX_VALUE             * @throws NumberFormatException if value is not an integer between MIN_VALUE and MAX_VALUE             */            public UnixFD(String value)            {               this(Long.parseLong(value));            }            /** The value of this as a byte. */            public byte byteValue() { return (byte) value; }            /** The value of this as a double. */            public double doubleValue() { return (double) value; }            /** The value of this as a float. */            public float floatValue() { return (float) value; }            /** The value of this as a int. */            public int intValue() { return (int) value; }            /** The value of this as a long. */            public long longValue() { return /*(long)*/ value; }            /** The value of this as a short. */            public short shortValue(){ return (short) value; }            /** Test two UnixFD for equality. */            public boolean equals(Object o)            {               return o instanceof UnixFD && ((UnixFD) o).value == this.value;            }            public int hashCode()            {               return (int) value;            }            /** Compare two UnixFD.             * @return 0 if equal, -ve or +ve if they are different.             */            public int compareTo(UnixFD other)            {               return (int) (this.value - other.value);            }            /** The value of this as a string */            public String toString()            {               return ""+value;            } } Thanks & Best regards, Yihui,Fan (��) Associate IT Architect Healthcare Standards Emerging Technology Institute(ETI) IBM China Software Development Lab Tel: (8610) 82454982  | Fax: (8610) 82453600   Mobile: 86-13911564003| Email: yihuifan@cn.ibm.com Address: Tower B, Diamond Building, Zhongguancun Software Park, Haidian District, Beijing 100193, P.R.China <table width=100%> <tr valign=top> <td width=40%>Matthew Johnson <dbus@matthew.ath.cx> 2011-02-16 19:17 <td width=59%> <table width=100%> <tr valign=top> <td> <div align=right>To</div> <td>Yi Hui Fan/China/IBM@IBMCN <tr valign=top> <td> <div align=right>cc</div> <td>dbus@lists.freedesktop.org <tr valign=top> <td> <div align=right>Subject</div> <td>Re: about UNIX_FD support in dbus java</table> <table> <tr valign=top> <td> <td></table> </table> <tt>On Mon Feb 14 14:19, Yi Hui Fan wrote: > Dears > > Is there any plan to support UNIX_FD data type and UNIX_FDS headers in > dbus java? We are going to develop an application in Java and Dbus. Some > features need UNIX_FD support. Currently I'm pushed for time and I've not thought how that would even work in Java yet. I'm happy to accept sensible patches though. Matt [attachment "signature.asc" deleted by Yi Hui Fan/China/IBM] </tt>