#include??//?sockaddr_in?
#include??//?socket?
#include??//?socket?
#include????//?printf?
#include????//?exit?
#include????//?bzero?
#include???

#include?
#define?SERVER_PORT?8000?
#define?BUFFER_SIZE?1024?
#define?FILE_NAME_MAX_SIZE?512?
??
int?main（）?
{?
??//?聲明并初始化一個(gè)客戶端的socket地址結(jié)構(gòu)?
??struct?sockaddr_in?client_addr;?
??bzero（&client_addr?sizeof（client_addr））;?
??client_addr.sin_family?=?AF_INET;?
??client_addr.sin_addr.s_addr?=?htons（INADDR_ANY）;?
??client_addr.sin_port?=?htons（0）;?
??
??//?創(chuàng)建socket，若成功，返回socket描述符?
??int?client_socket_fd?=?socket（AF_INET?SOCK_STREAM?0）;?
??if（client_socket_fd???{?
????perror（“Create?Socket?Failed:“）;?
????exit（1）;?
??}?
??
??//?綁定客戶端的socket和客戶端的socket地址結(jié)構(gòu)?非必需?
??if（-1?==?（bind（client_socket_fd?（struct?sockaddr*）&client_addr?sizeof（client_addr））））?
??{?
????perror（“Client?Bind?Failed:“）;?
????exit（1）;?
??}?
??
??//?聲明一個(gè)服務(wù)器端的socket地址結(jié)構(gòu)，并用服務(wù)器那邊的IP地址及端口對(duì)其進(jìn)行初始化，用于后面的連接?
??struct?sockaddr_in?server_addr;?
??bzero（&server_addr?sizeof（server_addr））;?
??server_addr.sin_family?=?AF_INET;?
??if（inet_pton（AF_INET?“127.0.0.1“?&server_addr.sin_addr）?==?0）?
??{?
????perror（“Server?IP?Address?Error:“）;?
????exit（1）;?
??}?
??server_addr.sin_port?=?htons（SERVER_PORT）;?
??socklen_t?server_addr_length?=?sizeof（server_addr）;?
??
??//?向服務(wù)器發(fā)起連接，連接成功后client_socket_fd代表了客戶端和服務(wù)器的一個(gè)socket連接?
??if（connect（client_socket_fd?（struct?sockaddr*）&server_addr?server_addr_length）???{?
????perror（“Can?Not?Connect?To?Server?IP:“）;?
????exit（0）;?
??}?
??
??//?輸入文件名?并放到緩沖區(qū)buffer中等待發(fā)送?
??char?file_name[FILE_NAME_MAX_SIZE+1];?
??bzero（file_name?FILE_NAME_MAX_SIZE+1）;?
??printf（“Please?Input?File?Name?On?Server:\t“）;?
??scanf（“%s“?file_name）;?

??//?打開(kāi)文件，準(zhǔn)備寫(xiě)入?
??int?fp=?open（file_name?O_WRONLY?|?O_APPEND?|?O_CREAT?0666）;?
??if（-1?==?fp）?
??{?
????printf（“File:\t%s?Can?Not?Open?To?Write\n“?file_name）;?
????exit（1）;?
??}?

??const?int?n?=?lseek（fp?0?SEEK_END）;
??char?str[20]=?“&“;
??sprintf（str?“&%d“?n）;
??strcat（file_name?str）;
??//?向服務(wù)器發(fā)送buffer中的數(shù)據(jù)?
??char?buffer[BUFFER_SIZE];?
??bzero（buffer?BUFFER_SIZE）;?
??strncpy（buffer?file_name?strlen（file_name）>BUFFER_SIZE?BUFFER_SIZE:strlen（file_name））;?
??if（send（client_socket_fd?buffer?BUFFER_SIZE?0）???{?
????perror（“Send?File?Name?Failed:“）;?
????exit（1）;?
??}?
??//?從服務(wù)器接收數(shù)據(jù)到buffer中?
??//?每接收一段數(shù)據(jù)，便將其寫(xiě)入文件中，循環(huán)直到文件接收完并寫(xiě)完為止?
??bzero（buffer?BUFFER_SIZE）;?
??int?length?=?0;?
??while（（length?=?recv（client_socket_fd?buffer?BUFFER_SIZE?0））?>?0）?
??{?
????if（write（fp?buffer?length）?????{?
??????printf（“File:\t%s?Write?Failed\n“?file_name）;?
??????break;?
????}?
????bzero（buffer?BUFFER_SIZE）;?
??}?
??//?接收成功后，關(guān)閉文件，關(guān)閉socket?
??printf（“Receive?File:\t%s?From?Server?IP?Successful!\n“?file_name）;?
??close（fp）;?
??//fp?=?NULL;
??close（client_socket_fd）;?
??return?0;?
}?

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2015-09-01?14:22??FTP\cli\
?????文件????????3310??2015-09-01?14:21??FTP\cli\client.c
?????目錄???????????0??2015-09-01?14:22??FTP\ser\
?????文件????????3850??2015-09-01?11:20??FTP\ser\server.c
?????目錄???????????0??2015-09-01?14:22??FTP\