c++用socket，ftp进行文件传输，实现上传与下载文件功能

c++用socket，ftp进行文件传输，实现上传与下载文件功能

用到socket，需要分为服务器端和客户端。

服务器端

1 声明并初始化一个服务端(本地)的地址结构

 
  sockaddr_in server_addr; 
  server_addr.sin_family = AF_INET; 
  server_addr.sin_addr.S_un.S_addr = INADDR_ANY; 
  server_addr.sin_port = htons(PORT); 

//2 初始化socket

  WSADATA wsaData; 
  WORD socketVersion = MAKEWORD(2, 0); 
  if(WSAStartup(socketVersion, &wsaData) != 0) 
  {
    
     
    printf("Init socket dll error!"); 
    exit(1); 
  } 

3创建socket

// 创建socket 
  SOCKET m_Socket = socket(AF_INET, SOCK_STREAM, 0); 
    if (SOCKET_ERROR == m_Socket) 
    {
    
     
      printf("Create Socket Error!"); 
    exit(1); 
    } 

4绑定监听

//监听 
  if (SOCKET_ERROR == listen(m_Socket, 10)) 
  {
    
     
    printf("Server Listen Failed: %d", WSAGetLastError()); 
    exit(1); 
  } 

5读取信息，判断客户端是需要读文件还是下载文件

	char buffer[BUFFER_SIZE]; 
	memset(buffer, 0, BUFFER_SIZE); 
    if (recv(m_New_Socket, buffer, BUFFER_SIZE, 0) < 0) 
    {
    
     
      printf("Client Receive Data Failed!"); 
      break; 
    } 
	
	std::cout<<buffer<<endl;

客户端

1初始化socket

// 初始化socket dll 
  WSADATA wsaData; 
  WORD socketVersion = MAKEWORD(2, 0); 
  if(WSAStartup(socketVersion, &wsaData) != 0) 
  {
    
     
    printf("Init socket dll error!"); 
    exit(1); 
  } 

2创建socket，指定服务器

//创建socket 
	  SOCKET c_Socket = socket(AF_INET, SOCK_STREAM, 0); 
	  if (SOCKET_ERROR == c_Socket) 
	  {
    
     
		  printf("Create Socket Error!"); 
		  system("pause"); 
		  exit(1); 
	  } 
 
	  //指定服务端的地址 
	  sockaddr_in server_addr; 
	  server_addr.sin_family = AF_INET; 
	  server_addr.sin_addr.S_un.S_addr = inet_addr(SERVER_IP); 
	  server_addr.sin_port = htons(PORT); 

3连接服务器

if (SOCKET_ERROR == connect(c_Socket, (LPSOCKADDR)&server_addr, sizeof(server_addr))) 
	  {
    
     
		  printf("Can Not Connect To Client IP!\n"); 
		  system("pause"); 
		  exit(1); 
	  } 

4向服务器请求指令，是上传，还是下载。

		if(send(c_Socket, buffer, BUFFER_SIZE, 0) < 0) 
		{
    
     
			  printf("Send File Name Failed\n"); 
			  system("pause"); 
			  exit(1); 
		} 

然后上传和下载过程就和本地的文件读写内容差不多。

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