参考：http://www.jb51.net/article/53732.htm

       本博客主要实现了简单win7系统下，两台电脑之间(客户机与服务器)的文件传输，主要是基于Windows网络编程中winsock来实现的，当然这个只是简单的实现，你可以根据你的需求在你的项目里面进行更改。这里主要实现的通过客户机(Client) 通过监听服务器（Server）的需求进而向服务器传输指定文件。

操作步骤：

       (1) 首先打开你的cmd控制台，查看你的端口号，输入命令：netstat -ano，如下图所示，TCP后面红色矩形框就是你部分的端口号。在client.cpp和server.cpp这两个文件中将“#define PORT  1029“改为你的可用端口号，比如“#define PORT  8128“，其中8128就是你某个可用端口号。

  (2) 如果你在同一台电脑上面进行模拟，是不用更改IP的，当然如果是两台电脑，这里就需要更改你的client.cpp和server.cpp这两个文件中#define SERVER_IP“127.0.0.1”，更改为你的Server服务器IP地址，查看你IP地址的方法为：打开你的打开你的cmd控制台，输入命令：ipconfig

                     

         (3) 然后新建两个工程即可，分别添加下面两个源文件，先运行客户端代码，然后运行服务器代码，输入想要接收客户端的文件名，就可以在你的服务器工程下接收到相应的文件。           

服务器代码：

server.cpp

/************************************************************************* 
  > File Name: Win_Server.c 
  > Author: SongLee 
 ************************************************************************/ 

#include <stdio.h> 
#include <stdlib.h> 
#include <string.h> 
#include <WinSock2.h> 

//#define PORT 8082 
#define PORT 1029   //需要更改你可用的端口
#define SERVER_IP "127.0.0.1" 
#define BUFFER_SIZE 1024 
#define FILE_NAME_MAX_SIZE 512 
#pragma comment(lib, "WS2_32") 

int main() 
{ 
  // 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); 

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

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

  //绑定socket和服务端(本地)地址 
  if (SOCKET_ERROR == bind(m_Socket, (LPSOCKADDR)&server_addr, sizeof(server_addr))) 
  { 
    printf("Server Bind Failed: %d", WSAGetLastError()); 
    exit(1); 
  } 

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


  while(1) 
  { 
    printf("Listening To Server...\n");    //监听服务器需求

    sockaddr_in client_addr; 
    int client_addr_len = sizeof(client_addr); 

    SOCKET m_New_Socket = accept(m_Socket, (sockaddr *)&client_addr, &client_addr_len); 
    if (SOCKET_ERROR == m_New_Socket) 
    { 
      printf("Server Accept Failed: %d", WSAGetLastError()); 
      break; 
    } 

 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; 
    } 

    char file_name[FILE_NAME_MAX_SIZE+1]; 
    memset(file_name, 0, FILE_NAME_MAX_SIZE+1); 
    strncpy(file_name, buffer, strlen(buffer)>FILE_NAME_MAX_SIZE ? FILE_NAME_MAX_SIZE:strlen(buffer)); 
    printf("%s\n", file_name); 

    FILE * fp = fopen(file_name, "rb"); //windows下是"rb",表示打开一个只读的二进制文件 
    if (NULL == fp) 
    { 
      printf("File: %s Not Found\n", file_name); 
    } 
        else 
    { 
      memset(buffer, 0, BUFFER_SIZE); 
      int length = 0; 

      while ((length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0) 
      { 
        if (send(m_New_Socket, buffer, length, 0) < 0) 
        { 
          printf("Send File: %s Failed\n", file_name); 
          break; 
        } 
        memset(buffer, 0, BUFFER_SIZE); 
      } 

      fclose(fp); 
      printf("File: %s Transfer Successful!\n", file_name); 
    } 
    closesocket(m_New_Socket); 
  } 

  closesocket(m_Socket); 
  //释放winsock库 
  WSACleanup(); 
  return 0; 
} 

客户机代码：

client.cpp

/************************************************************************* 
  > File Name: Win_Client.c 
  > Author: SongLee 
 ************************************************************************/ 

#include <stdio.h> 
#include <stdlib.h> 
#include <string.h> 
#include <WinSock2.h> 

//#define PORT 8082 
#define PORT 1029    //需要更改你可用的端口
#define SERVER_IP "127.0.0.1" 
#define BUFFER_SIZE 1024 
#define FILE_NAME_MAX_SIZE 512 
#pragma comment(lib, "WS2_32") 

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

  while(1){
      //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); 

      if (SOCKET_ERROR == connect(c_Socket, (LPSOCKADDR)&server_addr, sizeof(server_addr))) 
      { 
          printf("Can Not Connect To Client IP!\n"); 
          system("pause"); 
          exit(1); 
      } 
      //输入文件名 
      char file_name[FILE_NAME_MAX_SIZE+1]; 
      memset(file_name, 0, FILE_NAME_MAX_SIZE+1); 
      printf("Please Input File Name On Client: "); 

      scanf("%s", &file_name); 

      char buffer[BUFFER_SIZE]; 
      memset(buffer, 0, BUFFER_SIZE); 
      strncpy(buffer, file_name, strlen(file_name)>BUFFER_SIZE ? BUFFER_SIZE:strlen(file_name)); 

      //向服务器发送文件名 
      if(send(c_Socket, buffer, BUFFER_SIZE, 0) < 0) 
      { 
          printf("Send File Name Failed\n"); 
          system("pause"); 
          exit(1); 
      } 

      //打开文件，准备写入 
      FILE * fp = fopen(file_name, "wb"); //windows下是"wb",表示打开一个只写的二进制文件 
      if(NULL == fp) 
      { 
          printf("File: %s Can Not Open To Write\n", file_name); 
          system("pause"); 
          exit(1); 
      } 
      else 
      { 
          memset(buffer, 0, BUFFER_SIZE); 
          int length = 0; 
          while ((length = recv(c_Socket, buffer, BUFFER_SIZE, 0)) > 0) 
          { 
              if (fwrite(buffer, sizeof(char), length, fp) < length) 
              { 
                  printf("File: %s Write Failed\n", file_name); 
                  break; 
              } 
              memset(buffer, 0, BUFFER_SIZE); 
          } 

          printf("Receive File: %s From Client Successful!\n", file_name); 
      } 

      fclose(fp);

      closesocket(c_Socket); 
    }

  //释放winsock库 
  WSACleanup(); 

  system("pause"); 
  return 0; 
}