基于UDP的文件傳輸實驗報告

《數(shù)據(jù)庫技術(shù)》實驗報告授課教師：張國富蘇兆品zgf@實驗報告課程名稱課程名稱《數(shù)據(jù)庫技術(shù)》學(xué)生姓名***學(xué)號********專業(yè)班級電子信息工程指導(dǎo)教師成績2015年6月8日實驗名稱：基于UDP的文件傳輸1．實驗?zāi)康氖炀氄莆誗ocket編程；分析UDP與TCP的異同。2．實驗設(shè)備和條件硬件環(huán)境：PC機(jī)操作系統(tǒng)：Windows或者Linux語言環(huán)境：VisualC++，VS，GCC，Java均可3．實驗要求參考TCP文件傳輸demo,基于UDP實現(xiàn)send.mp3文件的傳輸，并測試接收到的文件與發(fā)送的文件是否一致。請各位同學(xué)于第15周星期三或星期四上課時將紙質(zhì)版（雙面打印）上交！4．實驗內(nèi)容：測試數(shù)據(jù)與實驗結(jié)果（可以抓圖粘貼）（1）發(fā)送端代碼。#include"stdafx.h"#include<Winsock2.h>#include<stdio.h>#defineMAX_LENGTH1024int_tmain(intargc,_TCHAR*argv[]){ WORDwVersionRequested; WSADATAwsaData; wVersionRequested=MAKEWORD(2,2); if(WSAStartup(wVersionRequested,&wsaData)!=0)//初始化ws2_32.dll動態(tài)庫 { printf("WSAStartup()failed!\n");//Winsock初始化錯誤 exit(-1); sendto(servsock,"",0,0,(structsockaddr*)&udpaddr,len); //關(guān)閉 shutdown(servsock,2); closesocket(servsock); WSACleanup(); getchar(); return0;}（2）接收端代碼。#include"stdafx.h"#include<Winsock2.h>#include<stdio.h>#defineMAX_LENGTH1024*10int_tmain(intargc,_TCHAR*argv[]){ WORDwVersionRequested; WSADATAwsaData; wVersionRequested=MAKEWORD(2,2); if(WSAStartup(wVersionRequested,&wsaData)!=0)//初始化ws2_32.dll動態(tài)庫 { printf("WSAStartup()failed!\n");//Winsock初始化錯誤 exit(-1); } if(wsaData.wVersion!=wVersionRequested) { printf("TheversionofWinsockisnotsuited!\n");//Winsock版本不匹配 WSACleanup();//結(jié)束對ws2_32.dll的調(diào)用 exit(-2); } //說明ws2_32.dll正確加載 printf("Loadws2_32.dllsuccessfully!\n"); //獲取本機(jī)IP地址 charPCname[100]={""}; char*IPaddress=NULL; gethostname(PCname,sizeof(PCname)); printf("LocalHostnameis%s.\n",PCname); structhostentFAR*lpHostEnt=gethostbyname(PCname); if(lpHostEnt==NULL) { //產(chǎn)生錯誤 printf("gethostbynamefailed!\n"); return-1; } //獲取IP LPSTRlpAddr=lpHostEnt->h_addr_list[0]; if(lpAddr) { structin_addrinAddr; memmove(&inAddr,lpAddr,4); //轉(zhuǎn)換為標(biāo)準(zhǔn)格式 IPaddress=inet_ntoa(inAddr);//將一個32位數(shù)字表示的IP地址轉(zhuǎn)換成點分十進(jìn)制IP地址字符串 if(sizeof(IPaddress)==0) printf("gethostIPfailed!\n"); else printf("LocalHostIPis%s.\n",IPaddress); } //創(chuàng)建套接字 //SOCKETservsock,clisock; SOCKETservsock; printf("CreateSocket...\n"); servsock=socket(AF_INET,SOCK_DGRAM,0);//數(shù)據(jù)報套接字 intservport=5555; intiSockErr=0; //定義服務(wù)器地址結(jié)構(gòu) sockaddr_inudpaddr,cliaddr; memset(&udpaddr,0,sizeof(udpaddr)); memset(&cliaddr,0,sizeof(cliaddr)); intclilen=sizeof(cliaddr); udpaddr.sin_family=AF_INET; udpaddr.sin_port=htons(servport); //將一個點分十進(jìn)制IP地址字符串轉(zhuǎn)換成32位數(shù)字表示的IP地址 udpaddr.sin_addr.s_addr=inet_addr(IPaddress);//""http://INADDR_ANY //綁定套接字到服務(wù)器地址結(jié)構(gòu) printf("Binding...\n"); iSockErr=bind(servsock,(sockaddr*)&udpaddr,sizeof(udpaddr)); if(iSockErr==SOCKET_ERROR) { printf("Bindingfailed:%d\n",WSAGetLastError());//根據(jù)不同的錯誤類型進(jìn)行不同的處理 exit(-3); } //函數(shù)調(diào)用成功，進(jìn)行其他處理 charbuff[256]="\0"; charbuffer[MAX_LENGTH]="\0"; intlen=0; //接收歡迎詞 memset(buffer,0,sizeof(buffer)); FILE*fp=NULL; errno_terr; err=fopen_s(&fp,"七里香.mp3","wb"); inti=0; while(1) { len=recvfrom(servsock,buffer,sizeof(buffer),0,(structsockaddr*)&cliaddr,&clilen); if(len==SOCKET_ERROR){ printf("recverror!\n"); break; } elseif(len==0) { printf("recvfinished!\n"); break; } buffer[len]=0; printf("receivedpacket%dlenth:%d\n\n",i++,len); fwrite(buffer,1,len,fp); sendto(servsock,buff,sizeof(buff),0,(structsockaddr*)&cliaddr,clilen); Sleep(8); //printf("%d\n",&len); } fclose(fp); //shutdown(clisock,2); // closesocket(clisock); shutdown(servsock,2); closesocket(servsock); WSACleanup(); getchar(); return0;}（3）簡單的代碼移植后接收端是否能正確接收？如果不能請分析原因，并嘗試調(diào)整發(fā)送端讀取數(shù)據(jù)的大小和延遲時間，以及接收端緩沖區(qū)的大小來解決數(shù)據(jù)丟包問題。給出參數(shù)