文件传送代码分析

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/************** Sendfile server.cpp *******************
************************ 2004/11/28 ****************/
#include <stdio.h>
#include <winsock2.h>
#pragma comment(lib, "ws2_32.lib")
void main() {
// 初始化

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

    // 建立socket
    SOCKET server;
    server = socket( AF_INET, SOCK_STREAM, IPPROTO_TCP );//用tcp协议进行传送

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

// 绑定socket
sockaddr_in service;

    service.sin_family = AF_INET;
    service.sin_addr.s_addr = inet_addr( "127.0.0.1" );
    service.sin_port = htons(830);

    if ( bind( server, (SOCKADDR*) &service, sizeof(service) ) == SOCKET_ERROR ) {
        printf( "bind() failed./n" );
        closesocket(server);
        return;
    }

    // 监听 socket
    if ( listen( server, 1 ) == SOCKET_ERROR )
        printf( "Error listening on socket./n");

// 接受连接
SOCKET AcceptSocket;

    printf( "Waiting for a client to connect.../n" );
    while (1) {
        AcceptSocket = SOCKET_ERROR;
        while ( AcceptSocket == SOCKET_ERROR ) {
            AcceptSocket = accept( server, NULL, NULL );
        }
        printf( "Client Connected./n");
        server = AcceptSocket;
        break;
    }

    // 发送接受数据
//    int bytesSent;
    char sendbuf[1024];//发送缓冲区
//DWORD dwFileSize;//文件大小
DWORD        dwRead;
    BOOL         bRet;
    char filename[]="c://MyMain.java";
HANDLE hFile=CreateFile(filename,GENERIC_READ,0,0,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,0);
//dwFileSize=GetFileSize(hFile,NULL);
while(true)
    {
      bRet=ReadFile(hFile,sendbuf,1024,&dwRead,NULL);
      if(bRet==FALSE)
      {
        MessageBox(NULL,"Read Buf ERROR!","Error",MB_OK);
        break;
      }
      else if(dwRead==0)
      {
        MessageBox(NULL,"Send file OK!","OK",MB_OK);
        break;
      }
      else
      {
       send(server,sendbuf,dwRead,0);
      }
    };
    CloseHandle(hFile);
    return;
}
传送端读入c://MyMain.java接受端改为c://syn.txt

这是网上的一段代码不过是基本的基于tcp协议的网络传送实例