SDK之socket 通信 客户端

//cilent.c socket 通信 客户端
#include<stdio.h>
//#include<windows.h>
#include"WINSOCK2.H"
#pragma comment(lib, "ws2_32.lib")
/*常量*/
#define RECV_BUFFER_SIZE 8192
/*main 功能 socket通信客户端*/
void main(int argc,char* argv[])
{
 //变量定义
 SOCKADDR_IN clientService; //地址
 SOCKET ConnectSocket;      //Socket
 WSADATA wsaData; //库
 LPVOID recvbuf ; //接收缓存
 int bytesSent;
 int bytesRecv = 0;
 char sendbuf[32] = "get information"; //默认发送数据
 //初始化库， 保证ws2_32.dll已加载
 int iResult = WSAStartup(MAKEWORD(2,2),&wsaData);
 if(iResult != NO_ERROR)
  printf("Error at WSAStartup()\n");
 //创建socket
 ConnectSocket = socket(AF_INET,   //IPv4
  SOCK_STREAM,                  //顺序的，可靠的，基于连接的，双向的数据流通信
  IPPROTO_TCP                   //使用ＴＣＰ协议
  );
 if(ConnectSocket == INVALID_SOCKET)
 {
  printf("Error at socket():%d\n",WSAGetLastError());
  WSACleanup();
  return;
 }
 //设置服务端的通信协议、IP地址、端口
 clientService.sin_family = AF_INET;
 clientService.sin_addr.s_addr = inet_addr("192.168.1.100"); //服务端的IP地址
 clientService.sin_port = htons(1000);
 //连接到服务端
 if(connect(ConnectSocket,//socket
  (SOCKADDR*)&clientService,//地址
  sizeof(clientService)//地址的大小
  ) == SOCKET_ERROR)
 {
  printf("Failed to connect(%d)\n",WSAGetLastError() );
  WSACleanup();
  return;
 }
 //准备发送数据
 //如果输入参数"-d",那么发送数据“download”，否则发送的数据是“get information”
 if(argc == 2 && (lstrcmp(argv[1],"-d")))
 {
  lstrcpyn(sendbuf,"download file",32);
 }
 //向服务端发送数据
 bytesSent = send(ConnectSocket,//socket
  sendbuf,//发送数据
  lstrlen(sendbuf)+1,//数据长度
  0);//无标识
 if(bytesSent == SOCKET_ERROR)
 {
  printf("send error(%d)\n",WSAGetLastError());
  closesocket(ConnectSocket); //关闭
  return ;
 }
 printf("bytes Sent:%ld\n",WSAGetLastError());
 //准备接收数据
 recvbuf = HeapAlloc(GetProcessHeap(),0,RECV_BUFFER_SIZE);
 //循环接收
 while(bytesRecv != SOCKET_ERROR)
 {
  bytesRecv = recv(ConnectSocket,//socket
  (char FAR *)recvbuf,//接收数据缓存
  RECV_BUFFER_SIZE,//缓存大小
  0);//无标识
  if(bytesRecv == 0)
  {
   printf("Conection Closed.\n");
   break;
  }
  //TODO ,处理接收的数据，简单的将收到的数据大小显示
  printf("Bytes Recv :%ld\n",bytesRecv);
 }
 HeapFree(GetProcessHeap(),0,recvbuf);
 WSACleanup();
 getchar();
 return;
}