Delphi 7 and Indy 9 writing data from TCPServer -


i have delphi program sits server receiving data , sending small acknowledgement packets. used code (edited brevity)

procedure tdmserver.onexecutetcpserver(athread: tidpeerthread); var   incomingpacket : string;   responsepacket : string; begin   incomingpacket := athread.connection.readln(#$03);    if incomingpacket <> ''   begin     responsepacket := processtelegram(incomingpacket);      athread.connection.writeln(responsepacket);   end;    athread.connection.disconnect; end;

this works fine, apart appending end of line crlf sends, client (not under control) doesn't like.

so changed to:

athread.connection.write(responsepacket);

and nothing received on client.

then tried

athread.connection.writebuffer(responsepacket, length(responsepacket), true);

to try , write immediately, still doesn't send @ all.

i have put in delays, tried opening buffer, flushing , closing again (like file), still no joy , time flushwritebuffer called av.

i'm stuck. please offer words of wisdom?

readln() strips off terminator result. processtelegram() accounting that? if needs terminator, have add in manually, eg:

processtelegram(incomingpacket + #03)

is responsepacket being formatted correctly client expecting? if client not expecting terminating crlf, using write() instead of writeln() correct thing do.

if use writebuffer(), must dereference string in order pass correct data address writebuffer(), eg:

writebuffer(responsepacket[1], length(responsepacket), true)

or:

writebuffer(pchar(responsepacket)^, length(responsepacket), true)

if client still not receiving response correctly, either not sending @ all, or not sending terminator client expecting. use packet sniffer, such wireshark, see client receiving, if anything.


Comments

Post a Comment

Popular posts from this blog

java.util.scanner - How to read and add only numbers to array from a text file -

i'm learning java , have question regarding reading file want read numbers file contains strings well. here example of file: 66.56 "3 java 3-43 5-42 2.1 1 and here coding: public class test { public static void main (string [] args){ if (0 < args.length) { file x = new file(args[0]); try{ scanner in = new scanner( new fileinputstream(x)); arraylist<double> test = new arraylist<>(); while(in.hasnext()){ if(in.hasnextdouble()){ double f=in.nextdouble(); test.add(f);} else {in.next();} } catch(ioexception e) { system.err.println("exception during reading: " + e); } } my problem add 66.56,2.1 , 1 doesn't add 3 after "3 or ignores 3-43 , 5-42 can tell me how skip strings , add doubles here? thanks all said 3 ie; "3, 3-43 , 4-42 strings either u read string , split , check number @ " , - or put in space between characters , integers. jvm after compilation tre
Read more

javascript - Backbone.js getting target attribute -

i trying figure out why value of e.target.getattribute('data-text') becoming null when go html backbone js file. html: <script type="text/template" id="lesson-template"> <span id="lesson-title"><%= tracks[0].title %></span> <select class="sel"> <% _.each(tracks, function(track) { %> <option value = "<%= track.text %>" data-text="<%= track.title %>"><%= track.title %></option> <% }); %> </select> <p id="tracktext"><%= tracks[0].text %></p> </script> js: window.librarylessonview = lessonview.extend({ events: { "change .sel " : "changetext" }, changetext: function(e) { alert(e.target.getattribute('data-text')); //i getting null value here! document.getelementbyid("lesson-title").innerhtml= e.target.getattribute('data-text&
Read more

html - Repeat image to extend header to fill screen -

i have header (2300x328px) , image (456x328px). want second image extend header left , right, header fills whole width availiable.it needs connect without overlapping, because there pattern. here image of mean: http://imgur.com/0ji3hae circles pattern (why should not overlap) , images extend header can repeated infinitely. for pattern align need align background pattern according header image (ex. center, left etc) , make sure pattern starts @ right place. i made fiddle explain mean - http://jsfiddle.net/taneleero/g99xa/ .header { background:url(http://i.imgur.com/bzvtzl4.jpg) repeat-x center; } .header img { display:block; margin:0px auto; }
Read more