#include <cstdlib>#include "file_tcp_soc.h"int main(int argc, char* argv[]){	int ret_val = 0;		if(argc != 5)	{		cerr<<"Usage client <ip> <port> <request_file> <save_file>"<<endl;		exit(1);	}		File_soc f_soc;		ret_val = f_soc.init_clin(argv[1],argv[2]);	if(ret_val < 0)	{		cerr<<"init_clin() error!"<<endl;		exit(1);	}		f_soc.set_file_info(argv[3], argv[4]);		ret_val = f_soc.tcp_conn();	if(ret_val < 0)	{		cerr<<"tcp_conn() error!"<<endl;		exit(1);	}		ret_val = f_soc.send_comd();	if(ret_val < 0)	{		cerr<<"send_comd() error!"<<endl;		exit(1);	}		ret_val = f_soc.save_file();	if(ret_val < 0)	{		cerr<<"save_file() error!"<<endl;		exit(1);	}		f_soc.close_clin();		return 0;	}