Solved

java client receive a packet from delphi server

Posted on 2003-10-26
3
248 Views
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?
0
Comment
Question by:lingwangbochen
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 15

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?
0
 

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?
 
0
 
LVL 15

Accepted Solution

by:
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();

0

Featured Post

Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
servlet example 11 56
login form jsp example 2 50
What's wrong with this code? 4 34
Html split(text) 2 28
Introduction Java can be integrated with native programs using an interface called JNI(Java Native Interface). Native programs are programs which can directly run on the processor. JNI is simply a naming and calling convention so that the JVM (Java…
Java functions are among the best things for programmers to work with as Java sites can be very easy to read and prepare. Java especially simplifies many processes in the coding industry as it helps integrate many forms of technology and different d…
Viewers will learn one way to get user input in Java. Introduce the Scanner object: Declare the variable that stores the user input: An example prompting the user for input: Methods you need to invoke in order to properly get  user input:
Viewers will learn about the regular for loop in Java and how to use it. Definition: Break the for loop down into 3 parts: Syntax when using for loops: Example using a for loop:

756 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question