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java client receive a packet from delphi server

Posted on 2003-10-26
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Last Modified: 2010-03-31
I want to receive a packet from server.It's seemed that readObject() cann't be used,when server is a java server,it can get the right class,but   when server is a delphi server,it shows "not a serilizable
inputstream",how could i get packet from delphi server?
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Question by:lingwangbochen
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3 Comments
 
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Expert Comment

by:jimmack
ID: 9625491
If you use readObject(), then your client is expecting a Java object to come across the link (including information about the methods, attributes etc.).

You say that you want to receive a "packet".  What is the format of the packet?

Can you read it as a byte[] sequence and reconstruct it on the Java client into an object there?
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Author Comment

by:lingwangbochen
ID: 9625603
the "packet" include the seqno of the packet,length of the packet,content of the packet...
for example:
   public int plength;
   int commandid;
   int seqno;
   int bindtype;
   String user;                      //can change to another content
   String passwd;                 //can changeable
it is sended from delphi using" SendBuf " function,
I can receive a char use read() or read(char[],int,int) of Class java.io.BufferedReader,i don't know how to reconstruct it and
 the packet is changeable,so i think read as object perhaps be simple. i only receive some char now.Could you help me?
 
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Accepted Solution

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jimmack earned 125 total points
ID: 9625651
You would probably be better using a DataInputStream instead of a BufferedReader.  This would allow you to use methods like readInt(), readUTF() etc.

(readUTF() is for reading Strings).

If the packet contains different data, is there a way to determine the format of the data that is expected across the link (like an identifier or something).

In this particular case, you need a class to store the attributes you have described, then you could read them from the stream using:

MyObject myObj = new MyObject();
DataInputStream dis = new DataInputStream(  < your raw input stream here > );
myObj.setPlength = dis.readInt();
myObj.setCommandid = dis.readInt();
myObj.setSeqno = dis.readInt();
myObj.setBindtype = dis.readInt();
myObj.setUser = dis.readUTF();
myObj.setpasswd = dis.readUTF();

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