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String, text, numbers, I/O II part<br />
the creation of the file if it does not exist are a single operation that is atomic with<br />
respect to all other filesystem activities that might affect the file. This method, in<br />
combination with the deleteOnExit() method, can therefore serve as the basis for a<br />
simple but reliable cooperative file-locking protocol."<br />
Q: How do I write an image to stdout? This is for a cgi program that will return an<br />
image to a browser.<br />
For example, if a user click on a link to http://somewhere.edu/cgi/getpix.cgi the<br />
browser will receive image data from the cgi program and will display the image.<br />
Answer: Send "Content-type: image/gif" - and then send the data.<br />
Alternatively, send an HTML page, with a pointer to the (possibly-freshly-written)<br />
image on the server.<br />
--<br />
Tim Tyler Try my latest game - it rockz - http://rockz.co.uk/<br />
Q: Does anyone know how I can get around the fact that a Message obj (from<br />
the <strong>Java</strong>Mail API) is not serializable?<br />
I would like to save a message obj to the hd, then read the file (is 'file' the wrong<br />
word here?) back to my e-mail client and read it as a Message obj.<br />
Answer: The obvious answer is: implement serializable yourself in a subclass!<br />
But! That won't work. The serialization mechanism will throw an exception at runtime.<br />
Even if it didn't, the class may be nonserializable for a good reason, for example it<br />
might contain a socket, which can't be reinitialized from a stream.<br />
What you need is a subclass that implements the Externalizable interface, and then<br />
your own code that saves as serializable objects those attributes of the object that<br />
you need to reconstitute it later. I'm not familiar with this particular object, but I<br />
imagine it has several get() methods that return serializable objects like Strings or<br />
ints. What you have to do is recover those objects and put them into the output<br />
stream yourself, and reverse the process on unserialization. The fields that are not<br />
serializable you ignore.<br />
You have to provide a no-argument constructor that reconstructs anything you aren't<br />
going to serialize (for example, opening a new socket). Read about the<br />
Externalizable interface for more details.<br />
--<br />
Frank LaRosa<br />
Q: Is it possible to send Vector class in socket communication. If it is, what<br />
function can make it.<br />
Answer: Make sure the objects contained in the Vector are Serializable. Look at<br />
java.io.ObjectOutputStream for serializing the Vector by wrapping the output stream<br />
from socket with the ObjectOutputStream...<br />
Q: How can you tell if an integer is odd or even?<br />
I know an even number is divisible by 2 but I'm thinking then how can I detect<br />
if a resulting number after dividing 2 ints has a remainder?<br />
Answer: Basically the method is simple, if a variable contains an odd number<br />
I want to return the value 'zero', and on the other hand if the<br />
variable contains an even number I want to return the value 'one'.<br />
file:///F|/350_t/350_tips/stings_text__date_numbers_io-II.htm (4 of 7) [2002-02-27 21:19:21]
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