FTP Client can not make a Data connection in Extened Passive Mode
When i send the command "EPSV" to the FTP server , it reply with the message :
229 Entering Extened Passive Mode (|||60238|)
It seems the Server accept Extended Passive Mode.
But then i send the LIST command to the server , after a few seconds i got an exception :
java.Net.ConnectException : Connection timed out : connect
In my Java Program, after sending the "EPSV" command to the server and receiving the port number, my program then initiate a data connection by calling : Socket dataConnection = new Socket(serverHost,serverPort) , serverHost is the host of the FTP server, and serverPort is the port that the server send me.
I think the problem here is that the initiate of data connection is failed. But i dont know why.
Can anyone explain for me ? I really appreciate.
You may be a newbie, but at least your questions are intelligent.
Abstracting the network part - yes, this can be done, but you should keep in mind that the VI will still be running on the remote target, so you should not use this to plug directly into your RT code. In these cases, a communication module is very good because it decouples the undeterministic comm from the RT code. You can do this either using a protocol, as you mentioned, or by calling the VIs running on the cFP. For example, a VI could be used as a repository by having an uninitialized shift register which maintains its value between runs (this is known as a LV2-style global) - the cFP app will write values into it and the PC app will read values from it.
To do this, you open a reference to the application running on the cFP and then you call VIs dynamically by name. By using the Call by Reference Node you can call the VI and use its connectory pane. All the primitives you need are in the Application Control palette and you should be able to find some examples in the example finder (Help>>Find Examples) by searching for "dynamic" and other similar terms. Attached is a simpified example.
To transfer data in a real-time target, I believe your best bet would be RT FIFOs.
To learn more about LabVIEW, I suggest you try searching this site and google for LabVIEW tutorials. Here, here, here, here, here and here are a few you can start with and here are some tutorial videos. You can also contact your local NI office and join one of their courses.
In addition, I suggest you read the LabVIEW style guide and the LabVIEW user manual (Help>>Search the LabVIEW Bookshelf).
You should also follow the online communities (this one, the LAVA forums, Info LabVIEW).
Try to take over the world!
Attachments:
Comm Demo.llb 63 KB
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