objective c - Java ByteBuffer -> [NSData bytes] to UInt16 -

-

good day all.

i'm writing client-server application based on sockets. server written java, client - objective-c on ios sdk 7.

my server writes data connected socket next code:

//socket client = new ...; dataoutputstream out = new dataoutputstream(client.getoutputstream()); // send package string message = "pings"; // package body byte bodysize = (byte) message.length(); java.nio.bytebuffer buffer = java.nio.bytebuffer.allocate(2 + 2 + 1 + bodysize); buffer.putshort((short) 16); // package id (2 bytes) buffer.putshort((short) 7); // package header (2 bytes, bitmask options) buffer.put(bodysize); // calculate & put body size in 5th byte (1 byte) buffer.put(message.getbytes()); // put message buffer (+5 bytes)  out.write(buffer.array()); // write stream out.close(); // close stream

then i'm trying parse accepted nsdata in objective-c client. here's code:

- (uint16)packageidfrompackagehead:(nsdata *)data {     const void *bytes = [data bytes];     uint16 packageid;     memcpy(&packageid, bytes + 0, 2); // first 2 bytes, must short = 16     return packageid; }

but, in "packageid" variable have value "4096". this? 16 decimal value?

next, i'm trying next value, "package header". wrote following code:

uint16 header; memcpy(&header, bytes + 2, 2); // skip first 2 bytes, copy next 2 bytes, must short = 7

i got huge value, 1792. why? number means? tried several offsets, +2, +3 - nothing. can't correct value. tried use conversion as

header = cfswapint32bigtohost(header);

or

header = cfswapint32hosttobig(header);

this leads nothing - got 0 every time after conversion.

next, when tried 5th byte (it contains our message string length, remember). here's code:

uint8 bodysize; memcpy(&bodysize, bytes + 4, 1); // 5th byte

i got value

'\x05'

and correct.

i'm input nsdata * value correct. here can see memory dump screenshot xcode:

debug mode. input nsdata * memory dump

where problem? in server code? or in client reading code? please help, spent 2 days find solution , still couldn't it.

thanks hot licks!

correct client code is:

const void *bytes = [data bytes]; uint16 packageid; // 16-bit value memcpy(&packageid, bytes + 0, 2); // copy first 2 bytes packageid = cfswapint16bigtohost(packageid); // fix endianness 16-bit value return packageid; // got correct value

or, , it's more convenient, modify java code on server with:

java.nio.bytebuffer buffer = java.nio.bytebuffer.allocate(2 + 2 + 1 + bodysize); buffer.order(java.nio.byteorder.little_endian);

after modification initial client code work correctly without using cfswapint... functions.

many-many help!


Comments

Post a Comment

Popular posts from this blog

C# random value from dictionary and tuple -

-
i have following code, , need random item contains string "region_1" dictionary. public static dictionary<int, tuple<string, int, currencytype>> itemarray = new dictionary<int, tuple<string, int, currencytype>>() { { 0xb3e, new tuple<string, int, currencytype>("region_1", 1500, currencytype.fame) } }; public static int generateitemid(string shopid) { var generateditem = itemarray.elementat(new random().next(0, itemarray.count)).key; } how select this? it's not possible efficiently... first create static random @ class level... prevent non-random behaviour if run query on short period of time... (it's seeded discrete clock) static random rnd = new random(); then: var item = itemarray.values .where(t => t.item1 == shopid) .orderby(_ => rnd.next()) .firstordefault()
Read more

cgi - How do I interpret URLs without extension as files rather than missing directories in nginx? -

-
so i'm trying install zoneminder , have run under nginx, has few compiled files need run using fast-cgi. these files lack extension. if file has extension, there no issue , nginx interprets file , return 404 if can't find it. if has no extension, assume it's directory , return 404 when can't find sort of index page. here have now: # security camera domain. server { listen 888; server_name mydomain.com; root /srv/http/zm; # enable php support. include php.conf; location / { index index.html index.htm index.php; } # enable cgi support. location ~ ^/cgi-bin/(.+)$ { alias /srv/cgi-bin/zm/; fastcgi_pass unix:/run/fcgiwrap.sock; fastcgi_param script_filename $document_root/$1; include fastcgi.conf; } } the idea is, under cgi-bin directory goes through fastcgi pipe. any idea on howi can fix this? upon closer inspection, realized zoneminder has 2 cgi sc...
Read more

.htaccess - htaccess convert request to clean url and add slash at the end of the url -

-
ok , searched more 4 days , more 20 posts here in stach or in websites without kind of success first here htaccess file rewriteengine on rewriterule ^([a-za-z0-9_]+)/?$ index.php?page=$1 [nc] rewriterule ^([a-za-z0-9_]+)\/([a-za-z0-9_]+)\/?$ index.php?page=$1&action=$2 [nc] i tried many codes 1 worked me can call request , works me www.example.com/pagename => www.example.com/index.php?page=pagename here questions , please provide me information "in detail" understand code well 1- how convert request automatically www.example.com/index.php?page=pagename www.example.com/pagename 2- if tried add slash @ end shows me page without images or styling mean www.example.com/pagename => works www.example.com/pagename/ => doesn't work that's :) for first part need 301 rule this: rewritecond %{the_request} /index\.php\?page=([^\s&]+) [nc] rewriterule ^ /%1? [r=301,l] for second part use absolute path in css, js, images files r...
Read more