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.NET Forum / Languages / C# / October 2007Entire string lost when removing null characters
Hello, The application that I'm working on sends a request to a server, and then receives the response via a udp configured socket. It queries a game server, so I don't have any control over the format or length of the data received. Everything works as it should, except for handling the received response. Heres what I have: 1) sock.SendTo(sendBytes, 0, sendBytes.Length, SocketFlags.None, iep); 2) sock.BeginReceive(recBytes, 0, recBytes.Length, SocketFlags.None, OnBeginReceive, null); // recBytes[4096] 3) string temp = System.Text.Encoding.Default.GetString(recBytes, 0, recBytes.Length); 4) string results = temp.Replace('\0', '\\'); At line 3, the contents of the temp string is: "ÿÿinfoResponse\0\a\0\0\0\0\0\0\0\n\0l\0\0si_name\0^8Game Server Name\0net_serverPunkbusterEnabled\01\0net_serverDedicated \01\0si_version\0ETQW 1.0.10826.32242 win-x86 Sep 12 2007 20:03:01\0si_gameReviewReadyWait\00\0si_disableGlobalChat \00\0si_noProficiency\00\0si_allowLateJoin\01\0si_minPlayers \02\0si_readyPercent\051\0si_disableVoting\00\0si_adminStart \00\0si_motd_3\0^7#executiveorder on irc.GameSurge.net \0si_motd_2\0^7http://www.executive-order.net\0si_motd_1\0^7Official ^<CAL ^N6v6 ^7Match Server\0si_irc\0#executiveorder\0si_email \0wh0racle@executive-order.net\0si_adminname\0wh0racle.exe\0si_website \0http://www.executive-order.net\0si_teamForceBalance\01\0si_timelimit \020\0si_rules\0sdGameRulesStopWatch\0si_spectators\01\0si_pure \01\0si_needPass\00\0si_teamDamage\01\0si_privateClients \02\0si_maxPlayers\032\0si_antiLagForgiving\00\0si_antiLagOnly \00\0si_antiLag\01\0bot_enable\01\0gamename\0baseETQW-1\0si_map\0maps/ area22.entities\0\0\0 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0" ...continues to null about 200-300 more times" ... which is ridiculous in the first place. But at line 4, the contents of results is nothing except "\\\\\\\\\\\\\\\\\\...etc". II've tried using Replace, Split, Remove.. none of it works. Any hints as to why the operations fail? > [...] > .... which is ridiculous in the first place. But at line 4, the > contents of results is nothing except "\\\\\\\\\\\\\\\\\\...etc". > II've tried using Replace, Split, Remove.. none of it works. Any hints > as to why the operations fail? I don't know. Seems like Replace would do what you seem to be trying to do (though why the backlash is a suitable replacement for a null character, I'm not sure). But, why is it ridiculous for there to be null characters in the data? Do you have any reason to believe that this application protocol is string-only? The data you posted contains things that, at least to me, look like it may be intended to be interpreted as a struct of some sort, with character arrays embedded. Perhaps a more appropriate solution would be to interpret it that way instead. Is there some documentation for this protocol that you can share, that would provide some insight into the larger issue you're dealing with? Pete > The application that I'm working on sends a request to a server, and > then receives the response via a udp configured socket. It queries a [quoted text clipped - 7 lines] > 3) string temp = System.Text.Encoding.Default.GetString(recBytes, 0, > recBytes.Length); It sounds unlikely that you should be using Encoding.Default here. Does the format specify the encoding of the data? > 4) string results = temp.Replace('\0', '\\'); > > At line 3, the contents of the temp string is: <snip> > ...continues > to null about 200-300 more times" > > ... which is ridiculous in the first place. Why do you think it's ridiculous? What did you expect to get? Note that you're currently decoding the whole byte array, even if you only received a few bytes. > But at line 4, the > contents of results is nothing except "\\\\\\\\\\\\\\\\\\...etc". > II've tried using Replace, Split, Remove.. none of it works. Any hints > as to why the operations fail? That sounds very unlikely to me. I've never seen string.Replace fail in that way. Can you create a short but complete program which demonstrates the problem? If you just hard-code the binary data received, you should still be able to show the problem.  SignatureJon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet If replying to the group, please do not mail me too > That sounds very unlikely to me. I've never seen string.Replace fail in > that way. > > Can you create a short but complete program which demonstrates the > problem? If you just hard-code the binary data received, you should > still be able to show the problem. Definitely, I will do that later today when I get some time. I've never seen if fail either, but for whatever reason it's finding the entire string to be '\0' if I use Replace. As far as the encoding goes, there is no official documentation regarding sending commands or requests to the game servers, so I'm kind of on my own with that. Default seems to be the only format that allows me to view readable data. > > That sounds very unlikely to me. I've never seen string.Replace fail in > > that way. [quoted text clipped - 10 lines] > Default seems to be the only format that allows me to view readable > data. Ok, I don't exactly know why.. but it seems to be working fine now? I haven't tried a Split quite yet, but atleast the Replace seems to be doing what it's supposed to do. Thanks for the help guys, I'm lost for words as to why it failed "temporarily".?! In article <1193406325.115306.307180@o80g2000hse.googlegroups.com>tcomer > Ok, I don't exactly know why.. but it seems to be working fine now? > I haven't tried a Split quite yet, but atleast the Replace seems to > be doing what it's supposed to do. Thanks for the help guys, I'm lost > forwords as to why it failed "temporarily".?! Well, when that sort of thing happens to me it's practically always user error. :) That is, the code worked fine, it's just that I made a mistake when trying to observe what it was doing. Pete SignatureI'm trying a new usenet client for Mac, Nemo OS X. You can download it at http://www.malcom-mac.com/nemo Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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