本机调用应用程序如何从JNLP获取返回值？

Question

I am launching a JNLP java application from a native client app (ie not a browser). When the JNLP finishes it's task, I need it to return a string to the calling app? How can I do this? Is it possible to return a value to a calling app - or do I need to have the calling app listen on a port and have the JNLP app write the value to that port through sockets?

Answer 1

Answering my own question!

I write to stdout from the child process (the JNLP)

• The parent launches the child process

   Process::Start 

• Read stdout from Parent

   string ret = process.StandardOutput.ReadToEnd(); 

•  Process::WaitForExit(); 

Anyone sees any problem in this?

Answer 2

If the all-permissions element is specified, you could try to set an environment variable which you can read from your C# application.

Set environment variable in Java:

System.getenv().put("returnValue", "yourValue");

Read environment variable in C#:

ProcessStartInfo p = new ProcessStartInfo("start ....");
....
string returnValue = p.EnvironmentVariables["returnValue"];

Answer 3

I like your idea to use sockets and think this is could be an easy solution.

It is not possible to get return values from a WebStart-application. Just see the help message from

javaws --help

There is no return-code available. (Sorry)

Have you thougth on a temporary file instead of the sockets?

Answer 4

It's a bit old but as fas as i know this is the exiting options to intercommunicate two process link .

I think the easiest way to solve your problem is use rmi, or jmx if you can, or just a simple socket