C++txt文件传输 下

这个是发送端。

思路：

文件小就1次传。大了就分开传。

.h

#define _WINSOCK_DEPRECATED_NO_WARNINGS #ifndef _H_H__#define _H_H__#include <iostream>#include <WinSock2.h>#include <string>#include <fstream>#include <thread>#pragma comment (lib,"ws2_32.lib")using namespace std;class C{public: C();~C();static void readfr();};#endif //_H_H__

cpp

#include "h.h"SOCKET s;C::C(){WSADATA wsadata;WORD v = MAKEWORD(2, 2);if (WSAStartup(v,&wsadata)==-1){exit(0);}s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);sockaddr_in sin;sin.sin_family = AF_INET;sin.sin_port = htons(4567);sin.sin_addr.S_un.S_addr = inet_addr("192.168.1.3");int n = sizeof(sin);if (::connect(s, (SOCKADDR*)&sin, n) == -1)return;thread t(readfr);t.detach();}C::~C(){WSACleanup();}void C::readfr(){char buf[255];int can = 256;int n;int used= 0;int R = recv(s, buf, 256, 0);buf[R] = '\0';cout << "Get "<<buf << endl;ifstream in("1.txt", ios_base::binary | ios_base::in);if (!in.is_open()){cout << "Open Fail" << endl;return;}in.seekg(0, ios::end);n = in.tellg();in.seekg(0, ios::beg);cout << n << endl;if (n<can){char buff[255];in.read(buff, n);::send(s, buff,n, 0);cout << "send over" << endl;in.close();R = ::recv(s, buff, 256, 0);return;}int num = 0; while (n>0){if (n >can)used = can;elseused = n;n -= used;char * buff = new char[used];in.read(buff, used);::send(s, buff, used, 0);cout << ++num << endl;R = ::recv(s, buff, 256, 0);delete buff;if (R<=0){break;}Sleep(1); } if (in.is_open()) in.close();closesocket(s);}int main(){C c;system("pause");}