For loop- seems to be just going to last value
Hi guys, carrying on from the thread I created yesterday I have managed to get the socket working between my server and my client, but I am having an issue when re-constructing a string that is being sent from the client to the server. I am talking about the for loop in line 151, which seems to just going straight to the last value of the for loop and thus the board isn't being reconstructed properly.
I'm including both the server and client code which just needs to compiled (host is set to localhost on port 4500) and you will see what I mean after inputting a move from the client. Can anyone spot the problem?
Server code
import java.io.*;
import java.net.*;
import javax.swing.JOptionPane;
class Server
public static void main (String []args) throws IOException
try
Server();
catch (IOException ex)
public static void Server () throws IOException
ServerSocket serverSocket=null;
int portNo=4500;
System.out.println("Starting");
try
serverSocket=new ServerSocket(portNo);
catch (IOException ex)
System.err.println("Could not create socket on port" +portNo);
System.exit(1);
System.out.println("Socket listening");
Socket clientSocket=null;
try
clientSocket=serverSocket.accept();
catch (IOException ex)
System.out.println("Accept failed");
System.exit(1);
PrintWriter out= new PrintWriter(clientSocket.getOutputStream(), true);
BufferedReader in=new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
//coordinates
String coordinates[] [] = new String [8] [8];
for (int i=0;i<8;i++)
for (int j=0;j<8;j++)
if ((i%2!=0)&&(j%2!=0))
coordinates[i] [j]="#";
else if ((i%2!=0)&&(j%2==0))
coordinates[i] [j]=" ";
else if ((i%2==0)&&(j%2!=0))
coordinates[i] [j]=" ";
else
coordinates[i] [j]="#";
coordinates[0][0]="R";
coordinates[0][1]="N";
coordinates[0][2]="B";
coordinates[0][3]="Q";
coordinates[0][4]="K";
coordinates[0][5]="B";
coordinates[0][6]="N";
coordinates[0][7]="R";
for (int i=0;i<8;i++)
coordinates[1]="P";
coordinates[7][0]="r";
coordinates[7][1]="n";
coordinates[7][2]="b";
coordinates[7][3]="q";
coordinates[7][4]="k";
coordinates[7][5]="b";
coordinates[7][6]="n";
coordinates[7][7]="r";
for (int i=0;i<8;i++)
coordinates[6][i]="p";
Board board1=new Board(coordinates);
boolean gameStart=true;
String coord="";
String originX="";
String originY="";
String destinationX="";
String destinationY;
while (gameStart)
System.out.println("trying to read from client");
String input="";
try
input=in.readLine();
System.out.println(input);
catch (IOException ex)
System.out.println("Read failed");
System.exit(1);
originX=input.substring(65);
originY=input.substring(66);
destinationX=input.substring(67);
destinationY=input.substring(68);
coord=input.substring(0,64);
System.out.println(coord);
for (int p=0;p<64;p++)
System.out.println(p);
for (int i=0;i<8;i++)
for (int j=0;j<8;j++)
coordinates [i] [j]=coord.substring(p);
if (i==(Integer.parseInt(originX))&&(j==(Integer.parseInt(originY))))
String piece="";
piece=coordinates [i] [j];
if ((i%2!=0)&&(j%2!=0))
coordinates[i] [j]="#";
else if ((i%2!=0)&&(j%2==0))
coordinates[i] [j]=" ";
else if ((i%2==0)&&(j%2!=0))
coordinates[i] [j]=" ";
else
coordinates[i] [j]="#";
for (int s=0;s<8;s++)
for (int t=0;t<8;t++)
if (s==(Integer.parseInt(destinationX))&&(t==(Integer.parseInt(destinationY))))
coordinates [s] [t]=piece;
board1.printBoard(coordinates);
out.close();
in.close();
clientSocket.close();
serverSocket.close();
class Board
boolean gameStart=true;
public Board()
public Board(String [] [] coordinates)
printBoard(coordinates);
String [] [] getCoOrdinates(String [] [] coordinates)
return coordinates;
public static void update (String coordinates [] [])
printBoard(coordinates);
public static void printBoard(String coordinates[] [])
for (int i=0;i<8;i++)
for (int j=0;j<8;j++)
System.out.print(coordinates[i][j]);
System.out.println();
}Client code:import java.io.*;
import java.net.*;
import javax.swing.JOptionPane;
class Client
public static void main (String [] args) throws IOException
Socket socket=null;
PrintWriter out=null;
BufferedReader in=null;
String serverLocation="localhost";
int portNo=4500;
System.out.println("Starting");
try
socket= new Socket (serverLocation,portNo);
out= new PrintWriter(socket.getOutputStream(),true);
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
catch (UnknownHostException ex)
System.out.println("Cannot find" + serverLocation);
System.exit(1);
catch (IOException ex1)
System.out.println("IO problem");
System.exit(1);
System.out.println("Connected");
//coordinates
String coordinates[] [] = new String [8] [8];
for (int i=0;i<8;i++)
for (int j=0;j<8;j++)
if ((i%2!=0)&&(j%2!=0))
coordinates[i] [j]="#";
else if ((i%2!=0)&&(j%2==0))
coordinates[i] [j]=" ";
else if ((i%2==0)&&(j%2!=0))
coordinates[i] [j]=" ";
else
coordinates[i] [j]="#";
coordinates[0][0]="R";
coordinates[0][1]="N";
coordinates[0][2]="B";
coordinates[0][3]="Q";
coordinates[0][4]="K";
coordinates[0][5]="B";
coordinates[0][6]="N";
coordinates[0][7]="R";
for (int i=0;i<8;i++)
coordinates[1][i]="P";
coordinates[7][0]="r";
coordinates[7][1]="n";
coordinates[7][2]="b";
coordinates[7][3]="q";
coordinates[7][4]="k";
coordinates[7][5]="b";
coordinates[7][6]="n";
coordinates[7][7]="r";
for (int i=0;i<8;i++)
coordinates[6][i]="p";
Board board1=new Board(coordinates);
boolean gameStart=true;
String coord="";
while (gameStart)
String originMove=JOptionPane.showInputDialog(null,"Client Origin Move","Enter in origin of piece",JOptionPane.QUESTION_MESSAGE);
String destinationMove=JOptionPane.showInputDialog(null,"Client Destination Move","Enter in destination of piece",JOptionPane.QUESTION_MESSAGE);
for (int i=0;i<8;i++)
for (int j=0;j<8;j++)
coord=coord+coordinates[i][j];
System.out.println(coord);
out.println(coord+originMove+destinationMove);
System.out.println("passed");
out.close();
in.close();
socket.close();
class Board
boolean gameStart=true;
public Board()
public Board(String [] [] coordinates)
printBoard(coordinates);
String [] [] getCoOrdinates(String [] [] coordinates)
return coordinates;
public static void update (String coordinates [] [])
printBoard(coordinates);
public static void printBoard(String coordinates[] [])
for (int i=0;i<8;i++)
for (int j=0;j<8;j++)
System.out.print(coordinates[i][j]);
System.out.println();
}Cheers,
Ben
jverd wrote:
p595659 wrote:
1) I don't think that even compiles. Since you're catching IOException, your throws clause is bogus--that method can never throw IOE.I have removed the try and catch statements in the main method. I cannot, however get rid of the throws IOException in the main method other my program won't compile.Right. Don't catch it, since you're not handling it. Just declare that it throws it.
Indeed, this is what I have done :)
>
3) Don't name methods the same as your class name.See answer to 4.
4) Start method names with lowercase letters.
try
serverSocket=new ServerSocket(portNo);
catch (IOException ex)
System.err.println("Could not create socket on port" +portNo);
System.exit(1);
ServerSocket is a part of the java.net package. I am just creating an instance of it. http://java.sun.com/j2se/1.4.2/docs/api/java/net/ServerSocket.html
I don't know what you're talking about. You had a class named Server and a method named Server. That's confusing.Changed- I didn't spot it, so I have named it startServer now.
>
5) There's almost no point to ever calling System.exit. Here, again, since you're not
actually handling the exception, don't bother catcing it.Sorry, but this was how I was taught when I started java. My understanding is that System.exit properly terminated applications so this freed up memory so it's abit of a habit of mine, is this wrong to do in this instance?Calling it in response to an exception is wrong. It's not that method's job to decide to shut down the VM. Just let the exception bubble up (or else handle it properly). You do not need to call System.exit to free up memory. It's freed up automatically when the VM exits. The OS takes care of that, without any help from you.Removed- thanks for clearing that up for me :)
JacobsB wrote:
line 151 of the server code or client code?Line 151 of my server code. My client is working fine up to this step of the programming I have done- it's just the server part I'm having issues with. You can compile and run the client fine- you can compile the server but as explained in the original post, I'm having a logical error when redrawing the board when it gets the 68 charecter string from the client (first 64 charecters are for the board, then the original position (x and y respectively), followed up the new position (x and y respectively again).
I'm including an updated version of the code, after all the comments above so we have an updated version for trying to solve the problem I'm having. The client code does not need to be updated as it has not changed yet, so you can use the code in the original post.
import java.io.*;
import java.net.*;
import javax.swing.JOptionPane;
class Server
public static void main (String []args) throws IOException
startServer();
public static void startServer () throws IOException
ServerSocket serverSocket=null;
int portNo=4500;
System.out.println("Starting");
try
serverSocket=new ServerSocket(portNo);
catch (IOException ex)
System.err.println("Could not create socket on port" +portNo);
ex.printStackTrace();
System.out.println("Socket listening");
Socket clientSocket=null;
try
clientSocket=serverSocket.accept();
catch (IOException ex)
System.out.println("Accept failed");
ex.printStackTrace();
PrintWriter out= new PrintWriter(clientSocket.getOutputStream(), true);
BufferedReader in=new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
//coordinates
String coordinates[] [] = new String [8] [8];
for (int i=0;i<8;i++)
for (int j=0;j<8;j++)
if ((i%2!=0)&&(j%2!=0))
coordinates[i] [j]="#";
else if ((i%2!=0)&&(j%2==0))
coordinates[i] [j]=" ";
else if ((i%2==0)&&(j%2!=0))
coordinates[i] [j]=" ";
else
coordinates[i] [j]="#";
coordinates[0][0]="R";
coordinates[0][1]="N";
coordinates[0][2]="B";
coordinates[0][3]="Q";
coordinates[0][4]="K";
coordinates[0][5]="B";
coordinates[0][6]="N";
coordinates[0][7]="R";
for (int i=0;i<8;i++)
coordinates[1]="P";
coordinates[7][0]="r";
coordinates[7][1]="n";
coordinates[7][2]="b";
coordinates[7][3]="q";
coordinates[7][4]="k";
coordinates[7][5]="b";
coordinates[7][6]="n";
coordinates[7][7]="r";
for (int i=0;i<8;i++)
coordinates[6][i]="p";
Board board1=new Board(coordinates);
boolean gameStart=true;
String coord="";
String originX="";
String originY="";
String destinationX="";
String destinationY;
while (gameStart)
System.out.println("trying to read from client");
String input="";
try
input=in.readLine();
System.out.println(input);
catch (IOException ex)
System.out.println("Read failed");
ex.printStackTrace();
coord=input.substring(0,64);
originX=input.substring(64,65);
originY=input.substring(65,66);
destinationX=input.substring(66,67);
destinationY=input.substring(67,68);
System.out.println(coord);
for (int p=0;p<64;p++)
System.out.println(p);
for (int i=0;i<8;i++)
for (int j=0;j<8;j++)
coordinates [i] [j]=coord.substring(p);
if (i==Integer.parseInt(originX)&&(j==(Integer.parseInt(originY))))
String piece="";
piece=coordinates [i] [j];
if ((i%2!=0)&&(j%2!=0))
coordinates[i] [j]="#";
else if ((i%2!=0)&&(j%2==0))
coordinates[i] [j]=" ";
else if ((i%2==0)&&(j%2!=0))
coordinates[i] [j]=" ";
else
coordinates[i] [j]="#";
for (int s=0;s<8;s++)
for (int t=0;t<8;t++)
if (s==(Integer.parseInt(destinationX))&&(t==(Integer.parseInt(destinationY))))
coordinates [s] [t]=piece;
board1.printBoard(coordinates);
out.close();
in.close();
clientSocket.close();
serverSocket.close();
class Board
boolean gameStart=true;
public Board()
public Board(String [] [] coordinates)
printBoard(coordinates);
String [] [] getCoOrdinates(String [] [] coordinates)
return coordinates;
public static void update (String coordinates [] [])
printBoard(coordinates);
public static void printBoard(String coordinates[] [])
for (int i=0;i<8;i++)
for (int j=0;j<8;j++)
System.out.print(coordinates[i][j]);
System.out.println();
}Ben
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Build array of elements in a for loop
Hello, I have a program where I am taking voltage measurements and computing resistances inside of a for loop. I then want to take these values an place them in individual arrays which are then sent to another subVI to compute the mean and standard deviation. Currently it appears the arrays are getting overwritten and only one value is stored in the array. Please let me know what I have to do to fix this. Thank you.
I have attached my VI and the area I am talking about is in the case statement inside the big for loop for case 1.
Message Edited by BJalbert on 05-25-2007 09:57 AM
Attachments:
StdTest2.vi 159 KBThe image shows two possibilities:
Still, you should really simplify your data structures. For example you could have all your 7 results as a single 1D array and built it as a 7xN 2D array, etc. You probably can reduce the clutter on the diagram by 90%!
It is a nightmare to deal with subVIS containing so many individual connectors.
Message Edited by altenbach on 05-25-2007 08:24 AM
LabVIEW Champion . Do more with less code and in less time .
Attachments:
ArrayBuildingInLoop.png 5 KB -
i am trying to download facebook for iphone3gs, it seems that everytime i try to click the free button, it just goes blank green button, and would not continue downloading or does not show any movement
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I pull fiftyfour bytes of data from MicroProcessor's EEPROM using serial port. It works fine. I then send a request for 512 bytes and my "read" goes into loop condition, no bytes are delivered and system is lost
Hello,
You mention that you send a string to the microprocessor that tells it how many bytes to send. Instead of requesting 512 bytes, try reading 10 times and only requesting about 50 bytes at a time.
If that doesn�t help, try directly communicating with your microprocessor through HyperTerminal. If you are not on a Windows system, please let me know. Also, if you are using an NI serial board instead of your computer�s serial port, let me know.
In Windows XP, go to Start, Programs, Accessories, Communications, and select HyperTerminal.
Enter a name for the connection and click OK.
In the next pop-up dialog, choose the COM port you are using to communicate with your device and click OK.
In the final pop
-up dialog, set the communication settings for communicating with your device.
Type the same commands you sent through LabVIEW and observe if you can receive the first 54 bytes you mention. Also observe if data is returned from your 512 byte request or if HyperTerminal just waits.
If you do not receive the 512 byte request through HyperTerminal, your microprocessor is unable to communicate with your computer at a low level. LabVIEW uses the same Windows DLLs as HyperTerminal for serial communication. Double check the instrument user manual for any additional information that may be necessary to communicate.
Please let me know the results from the above test in HyperTerminal. We can then proceed from there.
Grant M.
National Instruments -
Hello, one of our customers just encountered an execution error in a vi running under LabVIEW 6.1, which doesn't exist under LabVIEW 5.1 or 6.01. I have a simple vi that has two encapsulated For Loops. Two string arrays go in, one goes out of the outer loop. Inside the outer loop the first array is indexed. The string which results from this indexing is compared with all other strings from the second string array in the inner loop. If it matches one of the strings of the second array, it is not outputted, otherwise this string goes through the inner For Loop to the output of the inner loop and from there to the output of the outer loop. The count
terminal of the outer/inner loop is connected to the Array Size of the first/second string array. If the second array is empty, that means that the element in test from the first arry cannot match anything from the second array, so the element in test is send to the output of the inner loop and from there to the output of the outer loop. This works fine in LabVIEW 5.1 and 6.01, but NOT in LabVIEW 6.1. In LabVIEW 6.1 the inner loop is never executed if the count value is zero (which is correct), but the data line running through the loop is not executed either, which is different to what LabVIEW 5.1 and 6.01 do. There, the input string is sent to the output of the inner loop correctly even if the loop counter is zero. The solution is easy - I just have to connect the output of the outer loop to the data line BEFORE it enters the inner loop. But: I don't know if this is a LabVIEW 6.1 bug or if it is supposed to be a feature, but it brings some incompatibility in programming between the
different LabVIEW versions.
Best regards,
GabsiHi,
When a for-loop runs zero times, all outputs are 'undefined' (and should
be).
Besides, how would LV know what the output of a not executed routine should
be?
It might be handled differently in LV5 and LV6, which is unfortunate. In
both cases, the result is undefined.
It's not a bug. It's just something that should be avoided in any LV
version.
> The solution is easy - I just have to connect the
> output of the outer loop to the data line BEFORE it enters the inner
> loop. But: I don't know if this is a LabVIEW 6.1 bug or if it is
In some cases this does the trick. But if the data is changed in the inner
loop, this will effect the results if the N is not zero.
Technically, I think the output in this construction is also 'undefined'.
But LV handles this as expected / desired.
Another solution is to use a shift register. If N is zero, the input is
directly passed through to the output.
Regards,
Wiebe.
"Gabs" wrote in message
news:[email protected]...
> LabVIEW 6.1 If For Loop count terminal is zero then value going
> through the loop is not passed on to the output of the loop
>
> Hello, one of our customers just encountered an execution error in a
> vi running under LabVIEW 6.1, which doesn't exist under LabVIEW 5.1 or
> 6.01. I have a simple vi that has two encapsulated For Loops. Two
> string arrays go in, one goes out of the outer loop. Inside the outer
> loop the first array is indexed. The string which results from this
> indexing is compared with all other strings from the second string
> array in the inner loop. If it matches one of the strings of the
> second array, it is not outputted, otherwise this string goes through
> the inner For Loop to the output of the inner loop and from there to
> the output of the outer loop. The count terminal of the outer/inner
> loop is connected to the Array Size of the first/second string array.
> If the second array is empty, that means that the element in test from
> the first arry cannot match anything from the second array, so the
> element in test is send to the output of the inner loop and from there
> to the output of the outer loop. This works fine in LabVIEW 5.1 and
> 6.01, but NOT in LabVIEW 6.1. In LabVIEW 6.1 the inner loop is never
> executed if the count value is zero (which is correct), but the data
> line running through the loop is not executed either, which is
> different to what LabVIEW 5.1 and 6.01 do. There, the input string is
> sent to the output of the inner loop correctly even if the loop
> counter is zero. The solution is easy - I just have to connect the
> output of the outer loop to the data line BEFORE it enters the inner
> loop. But: I don't know if this is a LabVIEW 6.1 bug or if it is
> supposed to be a feature, but it brings some incompatibility in
> programming between the different LabVIEW versions.
> Best regards,
> Gabsi -
New Build ... Windows Update Never Shows Updates. Checking for Updates just goes round and round
I've got a brand new installation of Server 2008 Standard, full with GUI and I've setup the server with a public IP so I can get to the internet. Even tested getting to Dell Support website.
But when checking for updates the "Checking for updates" just goes round and round. It never stops and shows me what updates are available.
I'm trying to create an image of this build for testing purposes.
I ran into the same issue when I was doing a VM test and only had a private IP. I thought I wasn't able to get to Windows Update using our internal proxy with the private IP. But now there seems to be more of an issue.
I've already setup the Windows Update service the same way we have for 2003 and 2008 ... Automatic and started.
Any suggestions?Please run the system update readiness tool.
http://windows.microsoft.com/en-us/windows7/What-is-the-System-Update-Readiness-Tool?SignedIn=1
Then post the contents of;
%SYSTEMROOT%\Logs\CBS\CheckSUR.log
Regards, Dave Patrick ....
Microsoft Certified Professional
Microsoft MVP [Windows]
Disclaimer: This posting is provided "AS IS" with no warranties or guarantees , and confers no rights. -
About a month ago, I began periodically getting the spinning wheel while trimming, adding titles or transitions, etc. It lasts for about 15 seconds and then goes away. This seems to happen once every minute or two. I have more than enough RAM/Power, etc. About every other time I use FCPX it will spontaneously close (typically when editing a title). None of these things were happening previously. I have lots of projects that I store on Promise Pegasus drives via Thunderbolt. I only keep a few projects and the associated events open in FCPX at a time, otherwise I use Event Managaer X to keep track of them. Can anybody give me any suggestions as to why this is occurring and what I can do to remedy it? I have the latest version of FCPX as far as I can tell. This is driving me mad and costing me significant time while editing. By the way, I am doing just basic editing. Essentially trimming, cutting and adding some transitions and a few title screens. Thanks in advance for your help.
These apperarances of the spinning wheel tend to be related to some io operation that takes too long. Maybe the finder is trying to reach a network server that became unavailable.
I would try clearing caches and do an overall maintenance with an utility like OnyX.
Also, trashing preferences does no harm and is often the first troubleshooting measure when FCP X misbehaves.
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