C++超级简明的文件传输代码：接受端或客户端_c++写一个收发文件夹的程序-优快云博客

本文介绍了一个使用Winsock的C/C++示例程序，该程序演示了如何创建一个客户端来连接服务器并接收文件。客户端初始化Winsock，创建套接字，并连接到指定地址的服务器，然后接收来自服务器的数据并将其写入本地文件。

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#include <stdio.h>

#include <winsock2.h>
#pragma comment(lib, "ws2_32.lib")
void main() {

    // 初始化 Winsock.
    WSADATA wsaData;
    int iResult = WSAStartup( MAKEWORD(2,2), &wsaData );
    if ( iResult != NO_ERROR )
        printf("Error at WSAStartup()\n");

    // 建立socket socket.
    SOCKET client;
    client = socket( AF_INET, SOCK_STREAM, IPPROTO_TCP );

    if ( client == INVALID_SOCKET ) {
        printf( "Error at socket(): %ld\n", WSAGetLastError() );
        WSACleanup();
        return;
    }

    // 连接到服务器.
    sockaddr_in clientService;

    clientService.sin_family = AF_INET;
    clientService.sin_addr.s_addr = inet_addr( "127.0.0.1" );
    clientService.sin_port = htons( 8000 );

    if ( connect( client, (SOCKADDR*) &clientService, sizeof(clientService) ) == SOCKET_ERROR) {
        printf( "Failed to connect.\n" );
        WSACleanup();
        return;
    }
char recvbuf[1024];//发送缓冲区
   int read;
   DWORD        dwWrite;
    BOOL         bRet;
    // 发送并接收数据.
    char filename[]="D:\\1.jpg";
   HANDLE hFile=CreateFile(filename,GENERIC_WRITE,0,0,CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,0);
while(true)
    {
      read=recv( client, recvbuf, 1024, 0 );
      if(read==-1)break;
      bRet=WriteFile(hFile,recvbuf,read,&dwWrite,NULL);
      if(bRet==FALSE)
      {
        MessageBox(NULL,"Write Buf ERROR!","Error",MB_OK);
        break;
      }

    }
   MessageBox(NULL,"Receive file OK!","OK",MB_OK);
    return;

}

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