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[Mephisto]

Here I am, 9:45 on a Saturday night, working on class for a Master's in IT. Anyone have any Java Programming Questions? I am also experienced in PHP, Javascript and Drupal Development.

If you need a question, this one never got adequately resolved.

I'm trying to make a program that will check a yahoo email. However, when I do emailChecker.recieve(), it gives me an error message. I am using JavaMail. The code looks like this:

Spoiler: Code (click to show/hide)

Code: [Select]

public static void receive(String popServer, String popUser, String popPassword){
Store store = null;
Folder folder = null;
try {
// Get hold of the default session
Properties props = System.getProperties();
Session session = Session.getDefaultInstance(props, null);
// Get hold of a POP3 message store, and connect to it
store = session.getStore("pop3");
store.connect(popServer, popUser, popPassword);

// Try to get hold of the default folder
folder = store.getDefaultFolder();
if (folder == null) throw new Exception("No default folder");

// ...and its inbox
folder = folder.getFolder("INBOX");
if (folder == null) throw new Exception("No POP3 INBOX");

// Open the folder
folder.open(Folder.READ_ONLY);

// Get the message wrappers and process them
Message[] msgs = folder.getMessages();
for (int msgNum = 0; msgNum < msgs.length; msgNum++) {
printMessage(msgs[msgNum]);
}
} catch (Exception ex) {
ex.printStackTrace();
} finally {
// Close down
try {
if (folder!=null) folder.close(false);
if (store!=null) store.close();
} catch (Exception ex2) {
ex2.printStackTrace();
}
}
}

And the error message looks like this:

Spoiler (click to show/hide)

Code: [Select]

javax.mail.MessagingException: Connect failed;
  nested exception is:
java.net.ConnectException: Connection timed out: connect
at com.sun.mail.pop3.POP3Store.protocolConnect(POP3Store.java:210)
at javax.mail.Service.connect(Service.java:295)
at javax.mail.Service.connect(Service.java:176)
at src.Checker.receive(Checker.java:52)
at src.Checker.update(Checker.java:140)
at src.Launcher.main(Launcher.java:16)
Caused by: java.net.ConnectException: Connection timed out: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:319)
at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:233)
at com.sun.mail.pop3.Protocol.<init>(Protocol.java:111)
at com.sun.mail.pop3.POP3Store.getPort(POP3Store.java:261)
at com.sun.mail.pop3.POP3Store.protocolConnect(POP3Store.java:206)
... 5 more


Thanks in advance for the help.

Do you have a Yahoo Mail Plus account? Free accounts don't allow POP3 access.

[Kofthefens]

I do not, that explains it. Any idea how to check a gmail account? (The tutorial I found was for yahoo mail, so I tried that).

Thanks!

[Silfurdreki]

I am trying to make a (first) useful program in C. What I'm doing is that I'm trying to convert a binary image file of some strange format output by a CCD interface program (long story) into an ASCII table for further manipulation.

My problem involves reading the file in the first place. I have looked at several tutorials online but when I try to write similar code, it doesn't do what I want it to. So far I'm just trying out reading methods. Here's what I have so far:

Code: [Select]

#include <stdio.h>
int main(void)
{
FILE *file;
int close;
char in;
char out[11];
int i = 0;

file=fopen("c:\\test\\test.txt", "r");

while( (in = fgetc(file)) != EOF);
{
printf("%c", in);
out[i] = in;
i = ++i;
}

close = fclose(file);
printf("close = %d \n", close);

getchar();
return 0;
}
The program compiles and runs just fine, but it doesn't output anything. "test.txt" looks like this: "1 2 3 a b c", without quotes.

Also, I've seen the construct

Code: [Select]

int x[] to declare arrays in several tutorials, yet none explain what this means. I understand what x[10] or x[10] [10] means (a size 10 and a size 10 x 10 array, respectively). Finally, does x[10] give an array with elements 0-10 or an array with elements 0-9? I.e., does it give a 10 element array or an array with element 10 as its last element? Edit: Never mind, I just found this out myself.

Sorry for my extreme noobishness, but you've got to start somewhere, right?

[Shades]

The program compiles and runs just fine, but it doesn't output anything. "test.txt" looks like this: "1 2 3 a b c", without quotes.

Also, I've seen the construct

Code: [Select]

int x[] to declare arrays in several tutorials, yet none explain what this means. I understand what x[10] or x[10] [10] means (a size 10 and a size 10 x 10 array, respectively). Finally, does x[10] give an array with elements 0-10 or an array with elements 0-9? I.e., does it give a 10 element array or an array with element 10 as its last element? Edit: Never mind, I just found this out myself.

Sorry for my extreme noobishness, but you've got to start somewhere, right?

Okay so the reason is your ; after the while line. That will end the while loop there, its how single line while blocks work. Afterwards you have a scoped section that isn't actually realated to the while loop, at which point 'in' is -1.

Edit:
As an aside you don't need to say i = ++i;
++i; will already post increment the value of i, assigning it afterwards is just setting it to itself.

[Silfurdreki]

Thank you for the help! I found the problem on my own, though, but I appreciate it none the less.

I had a new problem, but it turns out your advice about not putting semi-colons after loop initializations were applicable there as well.

What about the x[] array declaration? Does anyone have an explanation?

[Starver]

Edit:
As an aside you don't need to say i = ++i;
++i; will already post increment the value of i, assigning it afterwards is just setting it to itself.

And you can also do "i++;", which I personally like (but YMMV).  Of course "i=i++;" might not be as useful.


edit: Forgot to say (And I thought you'd said you'd found out) "x[]" is basically a "it's an array, but I'm not giving the size here".

Code: [Select]

// Defining an array of ten items (all set to zero, I /think/ - I rarely leave uninitialised arrays that way for long)
int x[10];
// Defining an array of ten items *and initialising with values*
int y[10] = { 1,1,2,3,5,8,13,21,34,55,89 };
// Defining an array of ten items *and initialising the first four, the rest will be zero*
int z[10] = { 2,4,6,8 };
// Defining an indeterminate array (not something I do often) with a determinate set of values
int u[] = { 1,3,7,9 };  // equivalent to int u[4] =  { 1,3,7,9 };

...assuming I'm not wrong.  I might be polluted with another computer dialect or language of what you're using.  But someone will correct me, if so.

[Skyrunner]

int array[] = otherarray;
only works in C#, methinks.

Codepad gives me this error:

Code: [Select]

In function 'int main()':
Line 9: error: initializer fails to determine size of 'a3'
compilation terminated due to -Wfatal-errors.


[Shades]

"x[]" is basically a "it's an array, but I'm not giving the size here".

Code: [Select]

// Defining an indeterminate array (not something I do often) with a determinate set of values
int u[] = { 1,3,7,9 };  // equivalent to int u[4] =  { 1,3,7,9 };


Pretty sure this is right, I can't remember when I last declared an array like that (I generally use c++ not c and so tend towards std::array)  but I'm pretty sure you can't only declare an array like this if your also defining the contents (as in Starvers' example) so that size is known at compile time. (which I believe is the error Skyrunner got)

You can do variably sized arrays with int *u = new int

• ; where x is a variable defining the length at run time (as opposed to compile time). But then you get into the whole new/delete thing which is another thing I tend to avoid.

Edit: I appear to be unable to use forums....

[Skyrunner]

I tend to use <vector>'s vectors.

[Chattox]

In C++, how would I go about getting different variable types from one file? For example, say the file's contents were like this:

derp
0.2
30

How do I get a string from the first line, a float from the next, and an int from the third?

[Soadreqm]

Does C++ have any text parser functions? Because that's how I'd do it in Java. Read all three as strings, and then extract other values from the strings.

[GalenEvil]

if the format is predictable (string, double/float, integer, etc) in a repeating pattern then you could write up your own parsing system. Read line, parse as first data type, increment data type to expect, read next line, continue and restart the data type counter whenever you reach the end of an entry.

I haven't played much in C++ lately, but that is the logic I'd use to make it work.

[Thendash]

Can the string contain characters? You could check to see if a char is present, if yes it's a string else numbers.

[GalenEvil]

I believe that strings are treated as char constant arrays (probably misnaming) but you could do a quick check through string[index] -> string.Length (or some other magic) and come up with the answer.  So yes, it is my belief that you could do single character checks until either end of line or until you find a non-number character

[Thendash]

Sorry I meant can the string contain numbers.