单线程发包

//send发包TCP

WORD wVersionRequested;

WSADATA wsaData;

int err;

wVersionRequested = MAKEWORD( 2, 2 );

err = WSAStartup( wVersionRequested, &wsaData );

if ( err != 0 ) {

/* Tell the user that we could not find a usable */

/* WinSock DLL.                                  */

return;

}

if ( LOBYTE( wsaData.wVersion ) != 2 ||

HIBYTE( wsaData.wVersion ) != 2 ) {

/* Tell the user that we could not find a usable */

/* WinSock DLL.                                  */

WSACleanup( );

return; 

}

/* The WinSock DLL is acceptable. Proceed. */

/*客户端程序流程如下：

1）创建套接字（socket）；

2）向服务器发出连接请求(connect)；

3）和服务器端进行通信（send/recv）；

4)  关闭套接字；*/

SOCKET sClient = {0};

char szSendBuf[MAXBYTE] = "hellokitty!" ;

SOCKADDR_IN sClientAddr = {0} ;

sClientAddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");

sClientAddr.sin_family = AF_INET;

sClientAddr.sin_port = 12345;

sClient =  socket(AF_INET,SOCK_STREAM,IPPROTO_IP);

connect(sClient,(sockaddr*)&sClientAddr,sizeof(sClientAddr));

UpdateData() ;

m_EditUserName += m_EditPassword ;

//TCHAR *p = m_EditUserName.GetBuffer(0);

//发送  |  套接字  , 数据指针 CString.GetBuffer() , 

//缓冲区长度 CString.Strlen() * sizeof(wchar_t) + sizeof(wchar_t) 

int sd = send(sClient,

(char*)m_EditUserName.GetBuffer(0),

m_EditUserName.GetLength() * 2,

0);