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SDL_net a chyba spojenia

asd

SDL_net a chyba spojenia
« kdy: 07. 01. 2012, 14:06:39 »
Caute,

mam nasledujuce 2 male programy - server a klient, na networking tu pouzivam SDL_net. Server by mal poslat 4x strukturu packet a klient by ju mal 4x prijat.

packet.h
Kód: [Vybrat]
#ifndef PACKET_H
#define PACKET_H

#define BLOCK_SIZE 65536

struct packet
{
unsigned char m_buffer[BLOCK_SIZE];
};

#endif

server.cpp
Kód: [Vybrat]
#include <iostream>
#include <fstream>
#include <cstdlib>
#include <cstring>
#include <SDL/SDL.h>
#include <SDL/SDL_net.h>
#include "packet.h"

using namespace std;

TCPsocket g_serverSocketDescriptor = 0;
TCPsocket g_clientSocketDescriptor = 0;

IPaddress g_serverIP;
IPaddress * g_clientIP = 0;

void prepareConnection()
{
if (SDL_Init(0) == -1)
{
cerr << "SDL_Init: " << SDL_GetError() << endl;
exit(1);
}

if (SDLNet_Init() == -1)
{
cerr << "SDLNet_Init: " << SDLNet_GetError() << endl;
exit(2);
}

if (SDLNet_ResolveHost(&g_serverIP, 0, 2000) < 0)
{
cerr << "SDLNet_ResolveHost: " << SDLNet_GetError() << endl;
exit(3);
}
}

bool acceptConnection()
{
g_clientSocketDescriptor = SDLNet_TCP_Accept(g_serverSocketDescriptor);
return (g_clientSocketDescriptor) ? true : false;
}

void openSocket()
{
g_serverSocketDescriptor = SDLNet_TCP_Open(&g_serverIP);

if (!g_serverSocketDescriptor)
{
cerr << "SDLNet_TCP_Open: " << SDLNet_GetError() << endl;
exit(4);
}
}

void closeSocket()
{
if (g_clientSocketDescriptor)
SDLNet_TCP_Close(g_clientSocketDescriptor);
}

void closeConnection()
{
closeSocket();
SDLNet_TCP_Close(g_serverSocketDescriptor);
}

void send(const void * data, int len)
{
cout << "~ send\n";

if (SDLNet_TCP_Send(g_clientSocketDescriptor, data, len) < len)
{
cerr << "SDLNet_TCP_Send: " << SDLNet_GetError() << endl;
exit(6);
}
}

void recv(void * data, int len)
{
cout << "~ recv\n";

if (SDLNet_TCP_Recv(g_clientSocketDescriptor, data, len) < len)
{
cerr << "SDLNet_TCP_Recv: " << SDLNet_GetError << endl;
exit(7);
}
}

int main()
{
prepareConnection();
openSocket();

cout << "Waiting for client...\n";

while (!acceptConnection())
{
SDL_Delay(100);
continue;
}

cout << "Client connected\n";

packet p;

for (int i = 0; i < 4; i++)
send(&p, sizeof(packet));

closeConnection();

SDLNet_Quit();
SDL_Quit();

return 0;
}

client.cpp
Kód: [Vybrat]
#include <iostream>
#include <fstream>
#include <cstdlib>
#include <cstring>
#include <SDL/SDL.h>
#include <SDL/SDL_net.h>
#include "packet.h"

using namespace std;

TCPsocket g_serverSocketDescriptor = 0;
IPaddress g_serverIP;

void prepareConnection()
{
if (SDL_Init(0) == -1)
{
cerr << "SDL_Init: " << SDL_GetError() << endl;
exit(1);
}

if (SDLNet_Init() == -1)
{
cerr << "SDLNet_Init: " << SDLNet_GetError() << endl;
exit(2);
}

if (SDLNet_ResolveHost(&g_serverIP, "127.0.0.1", 2000) < 0)
{
cerr << "SDLNet_ResolveHost: " << SDLNet_GetError() << endl;
exit(3);
}
}

void openSocket()
{
g_serverSocketDescriptor = SDLNet_TCP_Open(&g_serverIP);

if (!g_serverSocketDescriptor)
{
cerr << "SDLNet_TCP_Open: " << SDLNet_GetError() << endl;
exit(4);
}
}

void closeConnection()
{
if (g_serverSocketDescriptor)
SDLNet_TCP_Close(g_serverSocketDescriptor);
}

void send(const void * data, int len)
{
cout << "~ send\n";

if (SDLNet_TCP_Send(g_serverSocketDescriptor, data, len) < len)
{
cerr << "SDLNet_TCP_Send: " << SDLNet_GetError() << endl;
exit(6);
}
}

void recv(void * data, int len)
{
cout << "~ recv\n";

if (SDLNet_TCP_Recv(g_serverSocketDescriptor, data, len) < len)
{
cerr << "SDLNet_TCP_Recv: " << SDLNet_GetError() << endl;
exit(7);
}
}

int main()
{
prepareConnection();
openSocket();

packet p;

for (int i = 0; i < 4; i++)
recv(&p, sizeof(packet));

closeConnection();

SDLNet_Quit();
SDL_Quit();

return 0;
}

kompilacia:
g++ server.cpp -o server -lSDL -lSDL_net
g++ client.cpp -o client -lSDL -lSDL_net

vystup:

$ ./server
Waiting for client...
Client connected
~ send
~ send
~ send
SDLNet_TCP_Send: accept() failed



$ ./client
~ recv
~ recv
SDLNet_TCP_Recv:


(ano, u SDLNet_TCP_Recv je chybova hlaska prazdna)

Z nejakeho dovodu ma klient problem prijat vsetky data, co vedie ku volaniu exit(). Pokial viem tak recv caka dovtedy, dokym mu nepridu data o velkosti len - to je predsa jedna z hlavnych uloh TCP. Niekedy to zbehne bez erroru, ale vacsinou vyhodi tuto chybu. Takze chcel by som sa opytat preco to robi resp. nerobi a ako to opravit.

Predom dakujem za odpovede

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asd

Re:SDL_net a chyba spojenia
« Odpověď #1 kdy: 07. 01. 2012, 14:09:37 »
(poprosim nejakeho moderatora o presunutie do kategorie Vývoj, omylom som to poslal sem do Sítě)

 

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