I have a problem when you try to receive data using the socket connection.

Hello

I created a socket connection between a pc (sever, win32) and a blackberry (client) and I have only two questions:

-When I send a string to the sever I get the unexpected result, I doubt if it's a problem of encoding between platforms.

-When I try to receive data, (an array of char as a string object), the customer demand freeze (drawing and management of events, so basically the main UI thread), even if I did all the stuff of connection in a separate thread, until I have shut down the server and also no data is received.

I left the codes below and would assess any response from you.

C++, win32 console application:

SOCKET _Socket;

int _tmain (int argc, _TCHAR * argv)

{

If (start_sever (_socket)) {}

char r_msg [26];

recv (_socket, r_msg, 26, 0);

std::cout< "receive="" :="" "="">< r_msg=""><>

char * s_msg customer = 'welcome ';

Send (_socket, szMessage, strlen (S_MSG), 0);

std::cout< "send="" :="" "="">< s_msg=""><>

Sleep (500);

Shutdown (_socket, SD_SEND);

closesocket (_socket);

WSACleanup();

} else {}

std::cout< "cannot="" initialize="">< std::endl="">

}

System ("pause");

return 0;

}

BOOL start_sever (socket) {}

WSADATA WsaDat;

If (WSAStartup (MAKEWORD (2.2) & WsaDat)! = 0)

{

std::cout<"WSA initialization="">

WSACleanup();

System ("pause");

Returns false;

}

Socket = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);

if(Socket==INVALID_SOCKET)

{

std::cout<"Socket creation="">

WSACleanup();

System ("pause");

Returns false;

}

SOCKADDR_IN serverInf;

serverInf.sin_family = AF_INET;

serverInf.sin_addr.s_addr = INADDR_ANY;

serverInf.sin_port = htons (8888);

If (bind (Socket,(sockaddr*) (& serverInf), sizeof (serverInf)) == SOCKET_ERROR)

{

std::cout<"Unable to="" bind="">

WSACleanup();

System ("pause");

Returns false;

}

Listen(Socket,1);

SOCKET TempSock = SOCKET_ERROR;

std::cout< "build="">

while(TempSock==SOCKET_ERROR)

{

std::cout<"Waiting for="" incoming="">

TempSock = accept (Socket, NULL, NULL);

}

Socket = TempSock;

std::cout<"Client>

Returns true;

}

Platform of Java for blackberry:

public class Bush extends form {}

-my current ipv4 address is set by default to avoid reset at each test

TextField ip_text_field = new TextField ("IP address:", "192.168.65.1");

-the server is waiting for any connection to this port ("8888")

TextField port_text_field = new TextField ("Port:", "8888");

ButtonField go_button_field = new ButtonField ("Connect", Field.FIELD_HCENTER) {}

protected Boolean invokeAction (int action) {}

UiApplication.getUiApplication () .invokeLater (new Runnable() {}

public void run() {}

try {

open_connection();

}catch (System.Exception e) {}

e.printStackTrace ();

Dialog.Alert (e.getMessage ());

}

}

});

return true;

}

};

public Socket() {}

Super ();

setTitle ("[taking sample]");

Add (ip_text_field); ip_text_field.setMargin (20, 0, 0, 0);

Add (port_text_field); port_text_field.setMargin (30, 0, 0, 0);

Add (go_button_field); go_button_field.setMargin (30, 0, 0, 0);

}

public Boolean onClose() {}

this. close();

return true;

}

_Con StreamConnection;

DataInputStream _in;

OutputStreamWriter _out;

public Sub open_connection() throws Exception {}

_CON = (StreamConnection) Connector.open ("socket: / /" + ip_text_field.getText () + ":" + port_text_field.getText () +)

» ; deviceside = true; interface = wifi");

this.add (new TextField ("", "connected successfully to Server"));

_in = _con.openDataInputStream ();

_out = new OutputStreamWriter (_con.openDataOutputStream ());

String msg = "Welcome to customer \r\n";

_out. Write (MSG);

String r_msg = _in.readUTF ();

this.add (new TextField ("read from sever:", r_msg));

_out. Flush();

_in. Close();

_out. Close();

_CON. Close();

this.add (new TextField ("", "data has been changed"));

}

}

Thanks for your help.

You treat on the thread of events.

You have the following code:

UiApplication.getUiApplication () .invokeLater (new Runnable() {}

public void run() {}

try {

open_connection();

.....

Now invokeLater essentially tells the operating system that the associated executable must be run on the event Thread.  You need start a separate Thread.  Extend this Thread, add your code in the run() method, and then start the Thread with start(). (not run()).  Then you must run the networking of processing on a separate Thread.

This will cause you problems updating the user interface.  Take a look at this help:

http://supportforums.BlackBerry.com/T5/Java-development/update-a-screen-on-the-main-event-thread/TA-...

Printing, this means that invokelater a separate Thread is a common misconception.  I recommend you to look at this:

http://supportforums.BlackBerry.com/T5/Java-development/what-is-the-event-thread/Ta-p/446865

In addition, I recommend that you take a look at the socketDemo which must be included as a sample-, otherwise you can find it on github:

https://github.com/BlackBerry/JDE-samples

Tags: BlackBerry Developers

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