socket_client

#include <WinSock2.h>
#include <Windows.h>
#include <stdio.h>
#pragma comment(lib, "WS2_32.lib")
#include "resource.h"
 
#define    WM_NETWORK            (WM_USER + 1)
 
 
HWND                        hDlgMain;
 
SOCKET                        Socket;
sockaddr_in                    Address;
 
char                        ListStr[256];
 
 
BOOL CALLBACK MainDlgProc(HWND hDlg, UINT iMessage, WPARAM wParam, LPARAM lParam);
 
 
int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd )
{
    DialogBox(hInstance, MAKEINTRESOURCE(IDD_DIALOG1), HWND_DESKTOP, MainDlgProc);
    return 0;
}
 
 
BOOL CALLBACK MainDlgProc(HWND hDlg, UINT iMessage, WPARAM wParam, LPARAM lParam)
{
    int                        res;
    WSAData                    wsaData;
 
    switch (iMessage)
    {
    case WM_INITDIALOG:
    case WM_CREATE:
        WSAStartup(MAKEWORD(2,2), &wsaData);
 
        Socket                = socket(PF_INET, SOCK_STREAM, 0);
 
        Address.sin_family    = AF_INET;
        Address.sin_addr.s_addr    = inet_addr(/*"Ip Address"*/);
        Address.sin_port    = htons(/*port*/);
 
        if(((res = connect(Socket, (sockaddr*)&Address, sizeof(Address))) < 0))
        {
            SendMessage(GetDlgItem(hDlg, IDC_LIST1), LB_ADDSTRING, NULL, (LPARAM)TEXT("접속불가"));
            break;
        }
        else
        {
            SendMessage(GetDlgItem(hDlg, IDC_LIST1), LB_ADDSTRING, NULL, (LPARAM)TEXT("접속가능"));
 
            WSAAsyncSelect(Socket, hDlg, WM_NETWORK, FD_READ | FD_CLOSE);
        }
        break;
 
    case WM_COMMAND:
        switch (LOWORD(wParam))
        {
        case IDOK:
            break;
 
        case IDCANCEL:
            break;
        }
        break;
 
    case WM_NETWORK:
        if(WSAGETSELECTERROR(lParam))
            SendMessage(hDlg, WM_CLOSE,NULL, NULL);
        else
        {
            switch (WSAGETSELECTEVENT(lParam))
            {
            case FD_READ:
                res            = recv(Socket, /**/, sizeof(/**/), 0);
 
                if(res)
                {
                }
                break;
 
            case FD_CLOSE:
                SendMessage(hDlg,WM_CLOSE,NULL,NULL);
                break;
            }
        }
        break;
 
    case WM_CLOSE:
        if(Socket != INVALID_SOCKET)
            closesocket(Socket);
 
        WSACleanup();
 
        EndDialog(hDlg,0);
 
        PostQuitMessage(0);
        break;
    }
 
    return 0;
}