서버
/*
## 소켓 서버 : 1 v n - overlapped callback
1. socket() : 소켓생성
2. bind() : 소켓설정
3. listen() : 수신대기열생성
4. accept() : 연결대기
5. read()&write()
WIN recv()&send : 데이터 읽고쓰기
6. close()
WIN closesocket : 소켓종료
*/
#include "stdafx.h"
#include <winsock2.h>
#pragma comment(lib, "Ws2_32.lib")
#define MAX_BUFFER 1024
#define SERVER_PORT 3500
struct SOCKETINFO
{
WSAOVERLAPPED overlapped;
WSABUF dataBuffer;
SOCKET socket;
char messageBuffer[MAX_BUFFER];
int receiveBytes;
int sendBytes;
};
void CALLBACK callback(DWORD Error, DWORD dataBytes, LPWSAOVERLAPPED overlapped, DWORD lnFlags);
int _tmain(int argc, _TCHAR* argv[])
{
// Winsock Start - windock.dll 로드
WSADATA WSAData;
if (WSAStartup(MAKEWORD(2, 2), &WSAData) != 0)
{
printf("Error - Can not load 'winsock.dll' file\n");
return 1;
}
// 1. 소켓생성
SOCKET listenSocket = WSASocket(AF_INET, SOCK_STREAM, 0, NULL, 0, WSA_FLAG_OVERLAPPED);
if (listenSocket == INVALID_SOCKET)
{
printf("Error - Invalid socket\n");
return 1;
}
// 서버정보 객체설정
SOCKADDR_IN serverAddr;
memset(&serverAddr, 0, sizeof(SOCKADDR_IN));
serverAddr.sin_family = PF_INET;
serverAddr.sin_port = htons(SERVER_PORT);
serverAddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
// 2. 소켓설정
if (bind(listenSocket, (struct sockaddr*)&serverAddr, sizeof(SOCKADDR_IN)) == SOCKET_ERROR)
{
printf("Error - Fail bind\n");
// 6. 소켓종료
closesocket(listenSocket);
// Winsock End
WSACleanup();
return 1;
}
// 3. 수신대기열생성
if (listen(listenSocket, 5) == SOCKET_ERROR)
{
printf("Error - Fail listen\n");
// 6. 소켓종료
closesocket(listenSocket);
// Winsock End
WSACleanup();
return 1;
}
SOCKADDR_IN clientAddr;
int addrLen = sizeof(SOCKADDR_IN);
memset(&clientAddr, 0, addrLen);
SOCKET clientSocket;
SOCKETINFO *socketInfo;
DWORD receiveBytes;
DWORD flags;
while (1)
{
clientSocket = accept(listenSocket, (struct sockaddr *)&clientAddr, &addrLen);
if (clientSocket == INVALID_SOCKET)
{
printf("Error - Accept Failure\n");
return 1;
}
socketInfo = (struct SOCKETINFO *)malloc(sizeof(struct SOCKETINFO));
memset((void *)socketInfo, 0x00, sizeof(struct SOCKETINFO));
socketInfo->socket = clientSocket;
socketInfo->dataBuffer.len = MAX_BUFFER;
socketInfo->dataBuffer.buf = socketInfo->messageBuffer;
flags = 0;
// 중첩 소캣을 지정하고 완료시 실행될 함수를 넘겨준다.
if (WSARecv(socketInfo->socket, &socketInfo->dataBuffer, 1, &receiveBytes, &flags, &(socketInfo->overlapped), callback))
{
if (WSAGetLastError() != WSA_IO_PENDING)
{
printf("Error - IO pending Failure\n");
return 1;
}
}
}
// 6-2. 리슨 소켓종료
closesocket(listenSocket);
// Winsock End
WSACleanup();
return 0;
}
void CALLBACK callback(DWORD Error, DWORD dataBytes, LPWSAOVERLAPPED overlapped, DWORD lnFlags)
{
struct SOCKETINFO *socketInfo;
DWORD sendBytes = 0;
DWORD receiveBytes = 0;
DWORD flags = 0;
socketInfo = (struct SOCKETINFO *)overlapped;
memset(&(socketInfo->overlapped), 0x00, sizeof(WSAOVERLAPPED));
if (dataBytes == 0)
{
closesocket(socketInfo->socket);
free(socketInfo);
return;
}
if (socketInfo->receiveBytes == 0)
{
// WSARecv(최초 대기에 대한)의 콜백일 경우
socketInfo->receiveBytes = dataBytes;
socketInfo->sendBytes = 0;
socketInfo->dataBuffer.buf = socketInfo->messageBuffer;
socketInfo->dataBuffer.len = socketInfo->receiveBytes;
printf("TRACE - Receive message : %s (%d bytes)\n", socketInfo->messageBuffer, dataBytes);
if (WSASend(socketInfo->socket, &(socketInfo->dataBuffer), 1, &sendBytes, 0, &(socketInfo->overlapped), callback) == SOCKET_ERROR)
{
if (WSAGetLastError() != WSA_IO_PENDING)
{
printf("Error - Fail WSASend(error_code : %d)\n", WSAGetLastError());
}
}
}
else
{
// WSASend(응답에 대한)의 콜백일 경우
socketInfo->sendBytes += dataBytes;
socketInfo->receiveBytes = 0;
socketInfo->dataBuffer.len = MAX_BUFFER;
socketInfo->dataBuffer.buf = socketInfo->messageBuffer;
printf("TRACE - Send message : %s (%d bytes)\n", socketInfo->messageBuffer, dataBytes);
if (WSARecv(socketInfo->socket, &socketInfo->dataBuffer, 1, &receiveBytes, &flags, &(socketInfo->overlapped), callback) == SOCKET_ERROR)
{
if (WSAGetLastError() != WSA_IO_PENDING)
{
printf("Error - Fail WSARecv(error_code : %d)\n", WSAGetLastError());
}
}
}
}
클라이언트
/*
## 소켓 서버 : 1 v n - overlapped callback
1. socket() : 소켓생성
2. connect() : 연결요청
3. read()&write()
WIN recv()&send : 데이터 읽고쓰기
4. close()
WIN closesocket : 소켓종료
*/
#include "stdafx.h"
#include <winsock2.h>
#pragma comment(lib, "Ws2_32.lib")
#define MAX_BUFFER 1024
#define SERVER_IP "127.0.0.1"
#define SERVER_PORT 3500
struct SOCKETINFO
{
WSAOVERLAPPED overlapped;
WSABUF dataBuffer;
int receiveBytes;
int sendBytes;
};
int _tmain(int argc, _TCHAR* argv[])
{
// Winsock Start - winsock.dll 로드
WSADATA WSAData;
if (WSAStartup(MAKEWORD(2, 0), &WSAData) != 0)
{
printf("Error - Can not load 'winsock.dll' file\n");
return 1;
}
// 1. 소켓생성
SOCKET listenSocket = WSASocket(AF_INET, SOCK_STREAM, 0, NULL, 0, WSA_FLAG_OVERLAPPED);
if (listenSocket == INVALID_SOCKET)
{
printf("Error - Invalid socket\n");
return 1;
}
// 서버정보 객체설정
SOCKADDR_IN serverAddr;
memset(&serverAddr, 0, sizeof(SOCKADDR_IN));
serverAddr.sin_family = AF_INET;
serverAddr.sin_port = htons(SERVER_PORT);
serverAddr.sin_addr.S_un.S_addr = inet_addr(SERVER_IP);
// 2. 연결요청
if (connect(listenSocket, (struct sockaddr *)&serverAddr, sizeof(serverAddr)) == SOCKET_ERROR)
{
printf("Error - Fail to connect\n");
// 4. 소켓종료
closesocket(listenSocket);
// Winsock End
WSACleanup();
return 1;
}
else
{
printf("Server Connected\n* Enter Message\n->");
}
SOCKETINFO *socketInfo;
DWORD sendBytes;
DWORD receiveBytes;
DWORD flags;
while (1)
{
// 메시지 입력
char messageBuffer[MAX_BUFFER];
int i, bufferLen;
for (i = 0; 1; i++)
{
messageBuffer[i] = getchar();
if (messageBuffer[i] == '\n')
{
messageBuffer[i++] = '\0';
break;
}
}
bufferLen = i;
socketInfo = (struct SOCKETINFO *)malloc(sizeof(struct SOCKETINFO));
memset((void *)socketInfo, 0x00, sizeof(struct SOCKETINFO));
socketInfo->dataBuffer.len = bufferLen;
socketInfo->dataBuffer.buf = messageBuffer;
// 3-1. 데이터 쓰기
int sendBytes = send(listenSocket, messageBuffer, bufferLen, 0);
if (sendBytes > 0)
{
printf("TRACE - Send message : %s (%d bytes)\n", messageBuffer, sendBytes);
// 3-2. 데이터 읽기
int receiveBytes = recv(listenSocket, messageBuffer, MAX_BUFFER, 0);
if (receiveBytes > 0)
{
printf("TRACE - Receive message : %s (%d bytes)\n* Enter Message\n->", messageBuffer, receiveBytes);
}
}
}
// 4. 소켓종료
closesocket(listenSocket);
// Winsock End
WSACleanup();
return 0;
}