size_t __cdecl fread( void *buffer, size_t size, size_t count, FILE *stream){
 unsigned long ul_rs = 0; //unsigned long return size
 ReadFile( (HANDLE)_get_osfhandle(stream->_file),
     buffer,
     count*size,
     &ul_rs,
     NULL) );
  return (size_t)ul_rs;
 }

 size_t __cdecl fwrite( void *buffer, size_t size, size_t count, FILE *stream){
 unsigned long ul_rs = 0; //unsigned long return size
 WriteFile( (HANDLE)_get_osfhandle(stream->_file),
    buffer,
    count*size,
    &ul_rs,
    NULL) );
 return (size_t)ul_rs;
 }

 #define SEEK_SET FILE_BEGIN
 #define SEEK_CUR FILE_CURRENT
 #define SEEK_END FILE_END

 int __cdecl fseek( FILE *stream, long offset, int origin ){
  return (SetFilePointer(_get_osfhandle(stream->_file),offset,origin))0:(int)GetLastError();
 }

 int __cdecl ftell(FILE *stream){
  return (int) SetFilePointer(_get_osfhandle(stream->_file),0,FILE_CURRENT);
 }

 < CRT(C-RunTime) 함수 >

 uintptr_t _beginthread( 
   void( *start_address )( void * ),
   unsigned stack_size,
   void *arglist 
 );

 uintptr_t _beginthreadex( 
   void *security,
   unsigned stack_size,
   unsigned ( *start_address )( void * ),
   void *arglist,
   unsigned initflag,
   unsigned *thrdaddr
 );

 < 출처 >

 http://msdn.microsoft.com/en-us/library/kdzttdcb(v=VS.80).aspx

 < WIndows API 함수 >

 HANDLE WINAPI CreateThread(
  _In_opt_   LPSECURITY_ATTRIBUTES lpThreadAttributes,
  _In_       SIZE_T dwStackSize,
  _In_       LPTHREAD_START_ROUTINE lpStartAddress,
  _In_opt_   LPVOID lpParameter,
  _In_       DWORD dwCreationFlags,
  _Out_opt_  LPDWORD lpThreadId
 );

 HANDLE WINAPI CreateRemoteThread(
  _In_   HANDLE hProcess,
  _In_   LPSECURITY_ATTRIBUTES lpThreadAttributes,
  _In_   SIZE_T dwStackSize,
  _In_   LPTHREAD_START_ROUTINE lpStartAddress,
  _In_   LPVOID lpParameter,
  _In_   DWORD dwCreationFlags,
  _Out_  LPDWORD lpThreadId
 );

 HANDLE CreateRemoteThreadEx(
  _In_       HANDLE hProcess,
  _In_opt_   LPSECURITY_ATTRIBUTES lpThreadAttributes,
  _In_       SIZE_T dwStackSize,
  _In_       LPTHREAD_START_ROUTINE lpStartAddress,
  _In_opt_   LPVOID lpParameter,
  _In_       DWORD dwCreationFlags,
  _In_opt_   LPPROC_THREAD_ATTRIBUTE_LIST lpAttributeList,
  _Out_opt_  LPDWORD lpThreadId
 );
 ※ CreateRemoteThreadEx 의 경우 Windows 7 상위계열에서만 사용가능
 

 < 출처 >

 http://msdn.microsoft.com/en-us/library/windows/desktop/ms682453(v=vs.85).aspx

 http://msdn.microsoft.com/en-us/library/windows/desktop/ms682437(v=vs.85).aspx

 http://msdn.microsoft.com/en-us/library/windows/desktop/dd405484(v=vs.85).aspx

 잘못된 예

 #include <windows.h>

 #include <stdio.h>

 DWORD WINAPI CallThread(LPVOID pVal){

   DWORD dwCnt = 0;

    if ( pVal )

       while(dwCnt++<10){

          printf("%d\n",*(int *)pVal);

          Sleep(1000);

       }

    return 0;

 }

 HANDLE WINAPI Call(){

    DWORD dwThreadId;

    HANDLE hThread;

    int nVal = 1;

    hThread = CreateThread(NULL,0,CallThread,&nVal,0,&dwThreadId);

    if ( hThread )

       return hThread;

    return NULL;

 }

 int main(void){

    HANDLE hThread;

    hThread = Call();

    if ( hThread ){

       WaitForSingleObject(hThread,INFINITE);

       CloseHandle(hThread);

    }

    return 0;

 }

 올바른 예

 #include <windows.h>

 #include <stdio.h>

 DWORD WINAPI CallThread(LPVOID pVal){

   DWORD dwCnt = 0;

    if ( pVal )

       while(dwCnt++<10){

          printf("%d\n",*(int *)pVal);

          Sleep(1000);

       }

    return 0;

 }

 HANDLE WINAPI Call(){

    DWORD dwThreadId;

    HANDLE hThread;

    static int nVal = 1;

    hThread = CreateThread(NULL,0,CallThread,&nVal,0,&dwThreadId);

    if ( hThread )

       return hThread;

    return NULL;

 }

 int main(void){

    HANDLE hThread;

    hThread = Call();

    if ( hThread ){

       WaitForSingleObject(hThread,INFINITE);

       CloseHandle(hThread);

    }

    return 0;

 }

 Server

 Client

1. Initialize Winsock.

2. Create a socket.

3. Bind the socket.

4. Listen on the socket for a client.

5. Accept a connection from a client.

6. Receive and send data.

7. Disconnect.

1. Initialize Winsock.

2. Create a socket.

3. Connect to the server.

4. Send and receive data.

5. Disconnect.

Server.cpp 

 #include <Winsock2.h>
 #include <windows.h>
 #include <stdio.h>

 #pragma comment(lib,"Ws2_32.lib")

 int main(void){
    SOCKET           s;
    WSADATA         wsa;
    SOCKADDR_IN   addr;
    hostent             *host;
    char                *lpIPString;

    // WSA 초기화
    memset(&wsa,0,sizeof(wsa));
    if ( WSAStartup(MAKEWORD(2,2),&wsa) )
        return 0;

    // 소켓 생성
    s = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);

    // 현재 컴퓨터의 IP 정보를 얻어옴
    host = gethostbyname(NULL);
    lpIPString = inet_ntoa( **((in_addr **)host->h_addr_list) );

   // 소켓 주소 생성
    memset(&addr,0,sizeof(addr));
    addr.sin_family = AF_INET; // type (IPv4)
    addr.sin_addr.s_addr = inet_addr(lpIPString); // ip
    addr.sin_port = htons(8181); // port

    // 소켓 주소 생성
    bind(s,(SOCKADDR *)&addr, sizeof(addr));

    {
        SOCKET   apt_s;
        int            nRecv;
        char         cBuffer[4096];
        char        *lptString = "Success SEND!! - Server\n";
        int            cnt = 0;

        // socket 및 bind 확인.

        listen(s,SOMAXCONN);
        memset(&apt_s,0,sizeof(apt_s));

        while ( cnt < 2 ){
            // connec t가 올 때까지 대기
            apt_s = accept(s,NULL,NULL);

            do{
                // send 가 올때까지 대기
                memset(cBuffer,0,4096);
                nRecv = recv(apt_s,cBuffer,4096,0);
                if ( nRecv == 0xFFFFFFFF )
                    break;
                if ( nRecv ){
                    send(apt_s,lptString,lstrlenA(lptString),0);
                    printf("%s",cBuffer);
                }
            }while(nRecv);
            closesocket(apt_s);
            cnt++;
        }
    }

    closesocket(s);

    WSACleanup();

    return 0;
 }

 Client.cpp 

 #include <Winsock2.h>
 #include <Ws2tcpip.h>
 #include <windows.h>
 #include <stdio.h>

 #pragma comment(lib,"Ws2_32.lib")

 int main(void){
    SOCKET        s;
    WSADATA     wsa;
    ADDRINFOA   addr;
    ADDRINFOA   *paddr;
    hostent         *host;
    char             *lpIPString;
    char             *lpPort = "8181";

    memset(&wsa,0,sizeof(wsa));
    if ( WSAStartup(MAKEWORD(2,2),&wsa) )
        return 0;

    memset(&addr,0,sizeof(addr));
    addr.ai_family = AF_INET;
    addr.ai_socktype = SOCK_STREAM;
    addr.ai_protocol = IPPROTO_TCP;

    host = gethostbyname(NULL);
    lpIPString = inet_ntoa( **((in_addr **)host->h_addr_list) );

    getaddrinfo(lpIPString,lpPort,&addr,&paddr);

    s = socket(paddr->ai_family,paddr->ai_socktype,paddr->ai_protocol);

    connect(s,paddr->ai_addr,paddr->ai_addrlen);

    {
        SOCKET  apt_s;
        int   nSend;
        int   nRecv;
        char  cBuffer[4096];
        char  *lptString = "Success RECV!! - Client\n";

        do{
            nSend = send(s,lptString,lstrlenA(lptString),0);
            if ( nSend == 0xFFFFFFFF )
                break;
            memset(cBuffer,0,4096);
            nRecv = recv(s,cBuffer,4096,0);
            printf("%s",cBuffer);
            Sleep(1000);
        }while(nRecv);
    }

    shutdown(s, SD_SEND);

    closesocket(s);

    WSACleanup();

    return 0;
}