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programovacie jazyky C

Programovanie C

WSADATA wsaData; //struktura WSADATA pre pracu s Winsock
int iResult;

// Initialize Winsock
iResult = WSAStartup(MAKEWORD(2, 2), &wsaData); //zakladna inicializacia
if (iResult != 0) //kontrola, ci nestala chyba
{
printf(“WSAStartup failed : % d\n”, iResult);
return 1;
}

struct addrinfo* result = NULL, * ptr = NULL; //struktura pre pracu s adresami
struct addrinfo hints;

ZeroMemory(&hints, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP; //pracujeme s protokolom TCP/IP

// Resolve the server address and port
iResult = getaddrinfo(“tu ma byt IP adresa servera”, “tu ma byt port”, &hints, &result);
if (iResult != 0) //kontrola, ci nenastala chyba
{
printf(“getaddrinfo failed : % d\n”, iResult);
WSACleanup();
return 1;
}
else
printf(“getaddrinfo didn’t fail…\n”);



//vytvorenie socketu a pripojenie sa

SOCKET ConnectSocket = INVALID_SOCKET;

// Attempt to connect to the first address returned by
// the call to getaddrinfo
ptr = result;

// Create a SOCKET for connecting to server => pokus o vytvorenie socketu
ConnectSocket = socket(ptr->ai_family, ptr->ai_socktype, ptr->ai_protocol);

if (ConnectSocket == INVALID_SOCKET) //kontrola, ci nenastala chyba
{
printf(“Error at socket() : % ld\n”, WSAGetLastError());
freeaddrinfo(result);
WSACleanup();
return 1;
}
else
printf(“Error at socket DIDN’T occur…\n”);

// Connect to server. => pokus o pripojenie sa na server

iResult = connect(ConnectSocket, ptr->ai_addr, (int)ptr->ai_addrlen);
if (iResult == SOCKET_ERROR) //kontrola, ci nenastala chyba
printf(“Not connected to server…\n”);
else
printf(“Connected to server!\n”);

if (iResult == SOCKET_ERROR) //osetrenie chyboveho stavu
{
closesocket(ConnectSocket);
ConnectSocket = INVALID_SOCKET;
WSACleanup();
return 1;
}

Sleep(250);



//posielanie

char sendbuf[/*treba zavolit vhodnu velkost, napr. 4096*/]; //buffer (v zasade retazec), kam sa budu ukladat data, ktore chcete posielat

iResult = send(ConnectSocket, sendbuf, (int)strlen(sendbuf), 0);
if (iResult == SOCKET_ERROR)
{
printf(“send failed : % d\n”, WSAGetLastError());
closesocket(ConnectSocket);
WSACleanup();
return 1;
}

printf(“Bytes Sent : % ld\n”, iResult); //vypisanie poctu odoslanych dat


//prijimanie

#define DEFAULT_BUFLEN 4096 //makro, kde definujeme velkost prijimacieho buffera

int recvbuflen = DEFAULT_BUFLEN;
char recvbuf[DEFAULT_BUFLEN];

iResult = recv(ConnectSocket, recvbuf, recvbuflen, 0); //funkcia na príjimanie

if (iResult > 0)
printf(“Bytes received : % d\n”, iResult); //prisli validne data, vypis poctu
else if (iResult == 0)
printf(“Connection closed\n”); //v tomto pripade server ukoncil komunikaciu
else
printf(“recv failed with error : % d\n”, WSAGetLastError()); //ina chyba




/ zavretie socketu

closesocket(ConnectSocket);
WSACleanup();

Upravili by ste tento program tak, aby sa to pripojilo na server a potom ma nechal zadat ID adresu, ktorú overi a nasledne my normalne ten server odpovie?