[C#] Assembly

Thu, 06 Mar 2014 15:15:46 +0100

Interesting, possible to cause an assembler code in c#?
In with C++ I know,

Code:
_asm

, but it is possible in c#?
Thx

I need a tip.

Fri, 31 Jan 2014 18:19:54 +0100

Hey guys,

I am doing my custom networking for my engine, so I need a little help. I'm using UDP socket, but as you know ( maybe ): "udp sends a packet and you'll never know - will it reach the destination or not."

So I am trying to make some kinda of "packet data check".
Pseudocode:
I got the struct called 'svpackets', this struct contains "char header[4];", "int clientIndex"; and 'bool clientGotMessage;'

So when the server sends a message to the client, it also fills the struct like:

Code:
svpackets[i].header[0] = CLIENT_MESSAGE_HEADER; 

// using rand to prevent message bothering
svpackets[i].header[1] = 0x3f * ( _sv.time * rand() % 0x2f + 0x4f );
svpackets[i].header[2] ... etc

svpackets[i].clientgotmessage = false; // not yet
svpackets[i].clientIndex = client.Number; // parameter

net_sendpacket(my data blablabla with svpackets.header);

++i;
if(i > 30)
i = 0; .. etc

Server runs loop, which also checks every client with svpacket, if svpacket.clientgotmessage equals TRUE, so just 'continue;'; If svpacket.clientgotmessage = false; so run timer for ~10 seconds and kick the client ( just because no packets for a long time ).

Soo, when client got the message from a server with 'CLIENT_MESSAGE_HEADER' header, it sends THE SAME header, but only changes the 'header[0]' to another value, so server will know that it is "return message", where it will set "clientGotMessage" to true.
The same method I've used for a clientsystem;

Since I am working with networking not for so long time, I am not sure at all.
It works great now, but as I've said before, I am not sure that it's good system at all,
is there any tip to make it better?

Here's what I got now:

Spoiler (Click to View)

PHP Code:
/*
 process client requests ( not client connect requests )
*/
void sv_processclient( netdata_t from, char *header, const char *message, const char *advanced )
{
    int                 i;
    serverclient_t      *p_temp;
    char                *c_header;
    
    
    // ignore connectionless packets
    if( sv_checkmagic( header, NET_OOB_BYTE1 ) )
        return;
    
    // ignore client requests
    if( sv_checkmagic( header, CL_COMMAND_MAGIC ) && cl_running->integer)
        return;
    
    // ignore server commands
    if( sv_checkmagic( header, SVCL_COMMAND_MAGIC1 ) )
        return;
    
    // find the client
    p_temp = sv_getclientbyip( from.sockaddress );
    
    if(!p_temp)
    {
        com_print("sv_processclient: couldn't find client by an ip address\n");
        return;
    }
    
    // client must be connected! ( not even 'connecting' )
    if(p_temp->state != SVCL_CONNECTED)                                                                                                         // just an empty slot
        return;

    if(p_temp->type == NA_BOT)                                                                                                                  // we don't need to
        return;

    
    switch (header[0]) {
        //
        // css packet apply
        //
        case (char)SVCL_COMMAND_MAGIC5:
            for( i = 0; i < MAX_COMMAND_SEQUENCE; i++ )                                                                                         // using 'MAX_COMMAND_SEQUENCE' since _sv.cmdIndex could get reset at the same time, so loop thru every entry
            {
                if( (_sv.cmd_sequence[i].clientId == _sv.clients[p_temp->clientnum].clientnum) && _sv.cmd_sequence[i].used )                    // check used css and owner of css
                {
                    // MAGIC5 is a client identificator
                    if( ((char)_sv.cmd_sequence[i].encodedMsg[0] == (char)header[1] &&                                                          // indentify by the header
                         (char)_sv.cmd_sequence[i].encodedMsg[1] == (char)header[2] &&
                         (char)_sv.cmd_sequence[i].encodedMsg[2] == (char)header[3] &&
                         (char)_sv.cmd_sequence[i].encodedMsg[3] == (char)header[4] ))
                    {
                        _sv.clients[p_temp->clientnum].lastCommandTime    = _sv.time;
                        _sv.clients[p_temp->clientnum].commandIndex++;
                        
                        _sv.cmd_sequence[i].index           = 0;
                        _sv.cmd_sequence[i].recvtime        = _sv.clients[p_temp->clientnum].lastCommandTime;
                        _sv.cmd_sequence[i].used            = false;
                        
                        // so we don't need it anymore for current client
                        //sv_resetsequence( _sv.cmd_sequence[i] );
                        //_sv.cmdIndex--;
                    }
                }
            }
        return;
        
        //
        // client commands
        //
        case (char)CL_HEADER_MAGIC:
            
            c_header = net_cmp4header( CL_COMMAND_MAGIC, header, 1 );

            //
            // client commands
            //
            
            /* client sent a message, send it to everyone */
            if(!strcmp( message, "cl_say"))
            {
                sv_sendservercommand( NULL, "cl_chat \"%s\" \"%s\"", p_temp->name, advanced );
            
                net_sendpacket( strlen(c_header), c_header, from );
                
                return;
            }
            
            // we won't resend CSS just because we don't need it
            if(!strcmp( message, "disconnect"))
            {
                com_print( "%s disconnected\n", p_temp->name );
                
                sv_dropclient( p_temp->clientnum, advanced );
            }
            
            if(!strcmp( message, "cl_reconnect"))
            {
                // TODO
                return;
            }

            return;

        //
        // unrecognized packets
        //
        default:
            com_print("WARNING: unknown packet data from '%s'\n", p_temp->name);
            sv_dropclient( p_temp->clientnum, "unknown data recieved\n" );
            break;
    }
} 

fopen fails

Sun, 19 Jan 2014 12:16:39 +0100

Hey guys,

I've noticed strange error, fopen returns NULL after some successful attempts, so I don't get any file loaded.
I've tried to zero it, but no luck.

Spoiler (Click to View)

It's just

Code:
filePtr = fopen(str("%s/Debug/textures/%s", fs_path->string, filename), "rb");

'str' is

Code:
char* str( const char *msg, ... )
{
    va_list     argptr;
    char        text[1024];
    
    va_start(argptr, msg);
    vsnprintf(text, sizeof(text), msg, argptr);
    va_end(argptr);
    
    return text;
}

Here's what I got after some attempts

.. as you see first time it's fine, but for second time it returns '?' at the end. ( or 377/377/ and another gibrish stuff )

ItsMods - C and C++

[C#] Assembly

I need a tip.

fopen fails