Re: how to wait for socket communications

I think OP is worried about performance and housekeeping
(not leaving temporary files around). However, with memory-
mapped file you don't need an actual file to back the mapping -
there's a standard approach of using the swap file for backing
the data. Then even file I/O may not occur and all communication
be in memory. Memory-mapped files should really be considered
in this context as memory allocation technique, not file I/O.

--
=====================================
Alexander Nickolov
Microsoft MVP [VC], MCSD
email: agnickolov@xxxxxxxx
MVP VC FAQ: http://vcfaq.mvps.org
=====================================

"Ali" <abdulrazaq@xxxxxxxxx> wrote in message
news:1179210849.716145.295730@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
On May 14, 10:55 pm, Ananya <Ana...@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
I am thinking of using sockets, because this was suggested in the last
post
to my question "Connecting Java to C++" in the Java Programming Forum at
forum.java.sun.com, the exact link
being:http://forum.java.sun.com/thread.jspa?threadID=5133663&tstart=0.

I am not sure why Alexander thought that sockets are not the right tool.
I
think that the advantage using sockets might be that it is faster than
writing a file, since you can communicate a whole array.

Thanks for all your communications!

"Ali" wrote:
On May 14, 9:02 am, Ananya <Ana...@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
I am trying to do socket communications between my C++ and my Java
program.

I created a Java program for drawing curves and I connected it to
Adobe's
C++ program for making a Photoshop plugin.

I am calling ShellExecuteEx for calling my Java program from C++, and
it
brings up a separate window.

First I would like to communicate the Photoshop picture information
into my
Java window. Originally I tried to to that with the lpParameters
string in
ShellExecuteInfo, but it is too slow to build this string.

So now I am trying to communicate this with socket communication. I
first
create a server in C++ before calling ShellExecuteEx, then I create a
client
in Java in the main method, but how can I wait in C++ for this Java
client to
be created before calling accept and sending the Photoshop picture
information?

I know I could just wait for a few seconds to make sure that my Java
program
came up by calling:
if ( ei.hProcess != NULL )
{
WaitForSingleObject(ei.hProcess, 10*1000 );}

But I would rather not lose any time and just wait exactly until the
Java
client is created.

And how can I wait in Java before receiving the picture information?

Finally, how can I wait in C++ for the Java program to close, at
which point
the information of curves that were drawn in Java is sent to C++ (to
be
received for the workpath in Photoshop)?

Thanks for your time looking at this.

Hmm, i though someone else will jump in to make this point clear. As
pointed by Alexander that using socket is not a good design approach.
His suggestion for mapped file is indeed flexible and commercial grade
solution BUT you can do that with simple file operation as i told in
previous thread. Why simple file I/O cant be your solution? and what
makes you think that sockets are good to use?

ali

Snip:

I am not sure why Alexander thought that sockets are not the right tool.
I
think that the advantage using sockets might be that it is faster than
writing a file, since you can communicate a whole array.

You must be kidding;-) BTW sockets are also no more than files with
over head of clumsy protocol (tcp/udp anyother) on the top . Yeah,
sockets can work and if you familiar with that then go head and do it.
I bet socket design can't be never faster then file I/O given the
facts that you will doing all the stuff on single machine. If you are
not familiar with files thats another story but usually writing or
reading to file wont take more than 3 to 4 lines. Easy peasy
Japanese ;-)


ali



.

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