#ifndef _USERPROTOCOL_H#define _USERPROTOCOL_H#define DATAMAXBUF 1024#define FILELENGTH 20#define COMMANDBUF 20#define ERRNOBUF 20#define USERLOGIN 1#define USERREGISTER 2#define UPLOADFILE 3#define DOWNLOADFILE 4#define DATASTART 1#define DATATRANSMIT 2#define DATAEND 3/*0 userLogin1 userReg2 upLoad3 downLoad*/typedef struct userLogin{	char userName[20];	char userPwd[20];	}userLogin;typedef struct userRegister{	char userName[20];	char userPwd[20];}userRegister;typedef struct upLoadPacket{	char fileName[20];	char fileTime[20];	unsigned int fileSize;}upLoadPack;typedef struct downLoadPacket{	char fileName[20];}downLoadPack;typedef struct metaPacket{	char fileName[20];	char fileTime[20];	unsigned int fileSize;}metaPack;typedef struct comPacket{	unsigned int com;	union 	{		userLogin userLog;		userRegister userReg;		upLoadPack upLoadPac;		downLoadPack downLoadPac;	}pack;}commandType;typedef struct fileData{		char fileData[DATAMAXBUF];	unsigned int dataSize; }fileData;typedef struct dataProtocol{	fileData filedata;	unsigned int status; //0 startfile 1 translation data 2 end file}dataProtocol;	//enum errnoInformations {userLoginErrno = 18,userRegErrno,fileExistErrno,fileNotExistErrno}#endif