C++ 基于SOCKET的文件传输系统，包含独立的服务器和客户端

#include <stdio.h> #include <stdlib.h> #include <winsock2.h> #pragma comment (lib, "ws2_32.lib") //加载 ws2_32.dll #define BUF_SIZE 1024 int main(){ //先检查文件是否存在 char *filename = "C:\\食物钠含量.pdf"; //文件名 FILE *fp = fopen(filename, "rb"); //以二进制方式打开文件 if(fp == NULL){ printf("Cannot open file, press any key to exit!\n"); system("pause"); exit(0); } WSADATA wsaData; WSAStartup( MAKEWORD(2, 2), &wsaData); SOCKET servSock = socket(AF_INET, SOCK_STREAM, 0); sockaddr_in sockAddr; memset(&sockAddr, 0, sizeof(sockAddr)); sockAddr.sin_family = PF_INET; sockAddr.sin_addr.s_addr = inet_addr("127.0.0.1"); sockAddr.sin_port = htons(1234); bind(servSock, (SOCKADDR*)&sockAddr, sizeof(SOCKADDR)); listen(servSock, 20); SOCKADDR clntAddr; int nSize = sizeof(SOCKADDR); SOCKET clntSock = accept(servSock, (SOCKADDR*)&clntAddr, &nSize); //循环发送数据，直到文件结尾 char buffer[BUF_SIZE] = {0}; //缓冲区 int nCount; while( (nCount = fread(buffer, 1, BUF_SIZE, fp)) > 0 ){ send(clntSock, buffer, nCount, 0); } shutdown(clntSock, SD_SEND); //文件读取完毕，断开输出流，向客户端发送FIN包 recv(clntSock, buffer, BUF_SIZE, 0); //阻塞，等待客户端接收完毕 fclose(fp); closesocket(clntSock); closesocket(servSock); WSACleanup(); system("pause"); return 0; }