以下は、TCP/IPクライアントアプリケーションのための完全なソースコードです。
#define _WIN32_WINNT 0x0501
#include <winsock2.h>
#include <ws2tcpip.h>
#include <stdio.h>
#include <stdlib.h>
#define DEFAULT_BUFLEN 512
#define DEFAULT_PORT "27015"
int main(int argc, char *argv[])
{
WSADATA wsaData;
SOCKET ConnectSocket = INVALID_SOCKET;
struct addrinfo *result = NULL,
*ptr = NULL,
hints;
char *sendbuf = "this is a test";
char recvbuf[DEFAULT_BUFLEN];
int iResult;
int recvbuflen = DEFAULT_BUFLEN;
if (argc != 2)
{
printf("usage: %s server-name\n", argv[0]);
return 1;
}
iResult = WSAStartup(MAKEWORD(2,2), &wsaData);
if (iResult != 0)
{
printf("WSAStartup failed: %d\n", iResult);
return 1;
}
ZeroMemory(&hints, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
iResult = getaddrinfo(argv[1], DEFAULT_PORT, &hints, &result);
if (iResult != 0)
{
printf("getaddrinfo failed: %d\n", iResult);
WSACleanup();
return 1;
}
for (ptr = result; ptr != NULL; ptr = ptr->ai_next)
{
ConnectSocket = socket(ptr->ai_family, ptr->ai_socktype,
ptr->ai_protocol);
if (ConnectSocket == INVALID_SOCKET)
{
printf("Error at socket(): %ld\n", WSAGetLastError());
freeaddrinfo(result);
WSACleanup();
return 1;
}
iResult = connect(ConnectSocket, ptr->ai_addr, (int)ptr->ai_addrlen);
if (iResult == SOCKET_ERROR)
{
closesocket(ConnectSocket);
ConnectSocket = INVALID_SOCKET;
continue;
}
break;
}
freeaddrinfo(result);
if (ConnectSocket == INVALID_SOCKET)
{
printf("Unable to connect to server!\n");
WSACleanup();
return 1;
}
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);
iResult = shutdown(ConnectSocket, SD_SEND);
if (iResult == SOCKET_ERROR)
{
printf("shutdown failed: %d\n", WSAGetLastError());
closesocket(ConnectSocket);
WSACleanup();
return 1;
}
do
{
ZeroMemory(recvbuf, recvbuflen);
iResult = recv(ConnectSocket, recvbuf, recvbuflen, 0);
if (0 < iResult)
{
printf("Bytes received: %d\n", iResult);
printf("recieved data: [%s]\n", recvbuf);
}
else if (iResult == 0)
{
printf("Connection closed\n");
}
else
{
printf("recv failed: %d\n", WSAGetLastError());
}
} while (0 < iResult);
closesocket(ConnectSocket);
WSACleanup();
return 0;
}
|