#include?
#include??
#include?
#include?
#include??
#include???
#include?
#include?
#include??
#include?
#include?
#include?

#define?len?4096

char?username[17]?=?{0};
char?password[17]?=?{0};

int?ctrl?=?1;
int?ctrl1?=?0;
int?ctrl2?=?1;

int?user_register（int）;
int?user_login（int）;
void?read_loop（void?*）;//
int?send_message（int）;
int?send_file（int）;
int?accept_file（int）;//
int?file_size（char?*）;//
void?duandian（）;//


int?main（）{

????struct?sockaddr_in?servaddr;
????servaddr.sin_family?=?AF_INET;
????servaddr.sin_port?=?htons（6666）;
????memset（servaddr.sin_zero?0?sizeof（servaddr.sin_zero））;

????if（inet_aton（“127.0.0.1“?&servaddr.sin_addr）?==?-1）{
????????perror（“iner_aton“）;
????????exit（1）;
????}

????int?sockfd?=?socket（AF_INET?SOCK_STREAM?0）;
????if（sockfd?==?-1）{
????????perror（“socket“）;
????????exit（1）;
????}

????if（connect（sockfd?（struct?sockaddr?*）&servaddr?sizeof（servaddr））?==?-1）{
????????perror（“connect“）;
????????exit（1）;
????}

????int?x;
????char?buf[len];

????while（1）{
????????printf（“清選擇?1.登陸?2.注冊\n“）;
????????scanf（“%d“?&x）;
????????if（x?==?2）{
????????????user_register（sockfd）;
????????????continue;
????????}
????????else?if（x?!=?1?&&?x?!=?2）{
????????????printf（“請重新輸入數字\n“）;
????????????continue;
????????}
????????if（user_login（sockfd））
????????????break;
????}

????pthread_t?thread;
????if（pthread_create（&thread?NULL?（void?*）read_loop?（void?*）&sockfd）?!=?0）
????????printf（“線程創建失敗\n“）;

????while（1）{
????????
????????printf（“請選擇?1.發信息?2.發文件\n“）;
????????scanf（“%d“?&ctrl2）;
????????while（ctrl?==?2）?{
????????????continue;
????????}
????????if（ctrl2?==?1）{
????????????send_message（sockfd）;
????????}else?if（ctrl2?==?2）{
????????????send_file（sockfd）;
????????}else?if（ctrl2?!=?3?||?ctrl2?!=?4）{
????????????printf（“請重新輸入數字\n“）;
????????????continue;
????????}
????}

????return?0;
}

int?user_register（int?fd）{
????int?length;
????char?account[len]?=?{0};
????char?feedback[len]?=?{0};

????printf（“請輸入由6～16位小寫英文或數字組成的用戶名\n“）;
????scanf（“%s“?username）;
????length?=?strlen（username）;
????for（int?i?=?length;?i?????????strcat（username?“?“）;
????}

????printf（“請輸入由6～16位小寫英文或數字組成的密碼\n“）;
????scanf（“%s“?password）;
????length?=?strlen（password）;
????for（int?i?=?length;?i?????????strcat（password?“?“）;
????}

????strcpy（account?“register????“）;
????strcat（account?username）;
????strcat（account?password）;
????write（fd?account?len）;

????read（fd?feedback?len）;
????printf（“%s\n“?feedback）;
????if（!strcmp（feedback?“注冊成功“））
????????return?1;
????else
????????user_register（fd）;
????return?0;
}

int?user_login（int?fd）{
????int?length;
????char?account[len]?=?{0};
????char?feedback[len]?=?{0};
????char?tem[len]?=?{0};

????printf（“請輸入用戶名\n“）;
????scanf（“%s“?username）;
????length?=?strlen（username）;
????for（int?i?=?length;?i?????????strcat（username?“?

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2018-12-09?23:39??1618012+1618011班-16180120012（1618012000116180110110）\
?????文件??????382043??2018-12-09?23:39??1618012+1618011班-16180120012（1618012000116180110110）\1618012+1618011班-16180120012（1618012000116180110110）.docx
?????文件??????570191??2018-12-09?23:37??1618012+1618011班-16180120012（1618012000116180110110）\1618012+1618011班-16180120012（1618012000116180110110）.pdf
?????目錄???????????0??2018-12-09?18:13??1618012+1618011班-16180120012（1618012000116180110110）\已編譯的文件\
?????文件???????18064??2018-12-09?00:36??1618012+1618011班-16180120012（1618012000116180110110）\已編譯的文件\client
?????文件???????22184??2018-12-09?00:35??1618012+1618011班-16180120012（1618012000116180110110）\已編譯的文件\server
?????目錄???????????0??2018-12-09?22:39??1618012+1618011班-16180120012（1618012000116180110110）\源文件\
?????文件????????8339??2018-12-09?16:44??1618012+1618011班-16180120012（1618012000116180110110）\源文件\client.c
?????文件???????13386??2018-12-09?22:39??1618012+1618011班-16180120012（1618012000116180110110）\源文件\server.c