Windows网络编程之winsock实现文件传输示例

本文实例展示了Windows网络编程中winsock实现文件传输的方法，对于进行Windows下的winsock网络编程有一定的借鉴参考价值。

该程序代码主要是基于TCP流协议的winsock网络文件传输示例，采用Windows下的C语言编写。可以实现传递任何格式文件的文件传输功能。

具体实现代码如下：

Server端代码如下：

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

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

#define PORT 8087
#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 Client...\n"); 

    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("Server 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;
}

Client端代码如下：

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

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

#define PORT 8087
#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);
  } 

  //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 Server 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 Server: ");
  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 Server Successful!\n", file_name);
  } 

  fclose(fp);
  closesocket(c_Socket); 

  //释放winsock库
  WSACleanup(); 

  system("pause");
  return 0;
}

程序中备有较为详尽的注释，相信大家不难理解。感兴趣的朋友可以根据自身需要对程序加以灵活改善，使其功能更加强大。