diff --git a/CMakeLists.txt b/CMakeLists.txt
index db8b442..1852c76 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -15,5 +15,7 @@ add_executable(o
         sqlite3.c
         login.c
         ui.c
-        include/ui.h)
+        signin.c
+        include/ui.h
+    )
 target_link_libraries(o "${LIBRARY_PATH}/${LIBRARY_NAME}")
\ No newline at end of file
diff --git a/include/function.h b/include/function.h
index 49a7c76..e2ac257 100644
--- a/include/function.h
+++ b/include/function.h
@@ -9,7 +9,9 @@
 #ifndef FUNCTION_H
 #define FUNCTION_H
 
-int Login();
+void Login(char *username,char*password,int *recall,char *errmsg);
+
+void Signin(const char *username,const char*password,int *recall,char *errmsg);
 
 void myexit();
 #endif //FUNCTION_H
diff --git a/login.c b/login.c
index e69de29..15b7a5b 100644
--- a/login.c
+++ b/login.c
@@ -0,0 +1,56 @@
+#include <stdio.h>
+#include<string.h>
+#include "./include/function.h"
+#include "./include/ui.h"
+void Login(char *username,char*password,int *recall,char *errmsg){
+    sqlite3 *db;
+    int rc;
+
+    // 打开数据库
+    rc = sqlite3_open("./data/msg.db", &db);
+    if (rc) {
+        strcpy(errmsg,"Error:database error.");
+        *recall=-1;
+        return;
+    }
+
+    // SQL 查询语句：查找用户及其密码
+    const char *sql = "SELECT user, password FROM users WHERE user = ?;";
+
+    sqlite3_stmt *stmt;
+
+    // 编译 SQL 语句
+    rc = sqlite3_prepare_v2(db, sql, -1, &stmt, 0);
+    if (rc != SQLITE_OK) {
+        strcpy(errmsg,"Error:database error.");
+        *recall=-1;
+        sqlite3_close(db);
+        return;
+    }
+
+    // 绑定查询参数
+    sqlite3_bind_text(stmt, 1, username, -1, SQLITE_STATIC);
+
+    rc = sqlite3_step(stmt);
+    if (rc == SQLITE_ROW) {
+        // 查找到用户，获取密码
+        const char *db_password = (const char *)sqlite3_column_text(stmt, 1);
+
+        // 如果密码匹配
+        if (db_password && strcmp(db_password, password) == 0) {
+            *recall=0;
+        } else {
+            strcpy(errmsg,"Incorrect username or password.");
+            *recall=-1;
+        }
+    } else {
+        strcpy(errmsg,"Incorrect username or password.");
+        *recall=-1;
+    }
+    // 绑定查询参数
+    // 清理资源
+    sqlite3_finalize(stmt);
+    sqlite3_close(db);
+
+    return;
+}
diff --git a/signin.c b/signin.c
new file mode 100644
index 0000000..108e4c3
--- /dev/null
+++ b/signin.c
@@ -0,0 +1,63 @@
+//
+// Created by zhang on 2024/12/29.
+//
+#include <stdio.h>
+#include <string.h>
+#include "./include/function.h"
+#include "./include/sqlite3.h"
+
+void Signin(const char *username,const char*password,int *recall,char *errmsg){
+    sqlite3 *db;
+    char *errMsg = 0;
+    int rc;
+    // 打开数据库，如果数据库文件不存在则创建它
+    rc = sqlite3_open("./data/msg.db", &db);
+    if (rc) {
+        strcpy(errmsg,"Error:database error.");
+        *recall=-1;
+        return;
+    }
+    const char *sql_create_table =
+            "CREATE TABLE IF NOT EXISTS users "
+            "("
+            "id INTEGER PRIMARY KEY AUTOINCREMENT, "
+            "user TEXT UNIQUE,"
+            "password TEXT"
+            ");";
+
+    // 执行 SQL 语句
+    rc = sqlite3_exec(db, sql_create_table, 0, 0, &errMsg);
+    if (rc != SQLITE_OK) {
+        strcpy(errmsg,"Error:database error.");
+        sqlite3_free(errMsg);
+        sqlite3_close(db);
+        *recall=-1;return;
+    }
+    const char *sql_insert="INSERT INTO users (user, password) VALUES (?, ?);";
+    sqlite3_stmt *insert;
+    rc = sqlite3_prepare_v2(db, sql_insert, -1, &insert, 0);
+    if (rc != SQLITE_OK) {
+        strcpy(errmsg,"Error:database error.");
+        *recall=-1;
+        sqlite3_close(db);
+        return;
+    }
+
+    // 将第一个参数 (name) 绑定到 SQL 语句中的第一个 "?"
+    sqlite3_bind_text(insert, 1, username, -1, SQLITE_STATIC);
+
+    // 将第二个参数 (email) 绑定到 SQL 语句中的第二个 "?"
+    sqlite3_bind_text(insert, 2, password, -1, SQLITE_STATIC);
+
+    rc = sqlite3_exec(db,insert,0,0,&errMsg);
+    if (rc != SQLITE_OK) {
+        strcpy(errmsg,errMsg);
+        sqlite3_free(errMsg);
+        sqlite3_finalize(insert);
+        sqlite3_close(db);
+        *recall=-1;return;
+    }
+    sqlite3_close(db);
+    *recall=0;
+    return;
+}
\ No newline at end of file
diff --git a/ui.c b/ui.c
index d632b3d..1171fdd 100644
--- a/ui.c
+++ b/ui.c
@@ -13,30 +13,31 @@
 #define WIN_HEIGHT 15
 #define WIN_WIDTH  40
 
-struct bottom{
-    int x,y;
-    int width,height;
+struct bottom {
+    int x, y;
+    int width, height;
     char *test[30];
     int private;
 };
 
-void draw_bottom(WINDOW *win,struct bottom *bot){
-    mvwprintw(win,bot->y,bot->x,"%s",bot->test);
+void draw_bottom(WINDOW *win, struct bottom *bot) {
+    mvwprintw(win, bot->y, bot->x, "%s", bot->test);
 }
 
-struct bottom *creat_bottom(WINDOW *win,int x,int y,int width,int height,char *test[]) {
-    struct bottom *bot=malloc(sizeof(struct bottom));
-    bot->y=x;
-    bot->x=y;
-    bot->width=width;
-    bot->height=height;
-    strcpy(bot->test,test);
+struct bottom *creat_bottom(WINDOW *win, int x, int y, int width, int height, char *test[]) {
+    struct bottom *bot = malloc(sizeof(struct bottom));
+    bot->y = x;
+    bot->x = y;
+    bot->width = width;
+    bot->height = height;
+    strcpy(bot->test, test);
     //mvwprintw(win,x,y,"%s",test);
     return bot;
 }
 
-bool click_bottom(MEVENT event,struct bottom bottom,int sx,int sy){
-    return event.x-sx>= bottom.x && event.x-sx < bottom.x + bottom.width && event.y-sy >= bottom.y && event.y-sy < bottom.y + bottom.height;
+bool click_bottom(MEVENT event, struct bottom bottom, int sx, int sy) {
+    return event.x - sx >= bottom.x && event.x - sx < bottom.x + bottom.width && event.y - sy >= bottom.y &&
+           event.y - sy < bottom.y + bottom.height;
 }
 
 int Welcome_ui() {
@@ -53,32 +54,41 @@ int Welcome_ui() {
     int start_y = (LINES - WIN_HEIGHT) / 2;
     int start_x = (COLS - WIN_WIDTH) / 2;
     WINDOW *welcome_win = newwin(WIN_HEIGHT, WIN_WIDTH, start_y, start_x);
-    keypad(welcome_win,TRUE);
-    wborder(welcome_win, '|', '|', '-','-','+', '+', '+', '+');
+    keypad(welcome_win, TRUE);
+    wborder(welcome_win, '|', '|', '-', '-', '+', '+', '+', '+');
     // 标题
     mvwprintw(welcome_win, 1, 1, "Welcome to math calculate system!");
-    struct bottom *login= creat_bottom(welcome_win,4,1,5,1,"Login");
-    draw_bottom(welcome_win,login);
-    struct bottom *signin= creat_bottom(welcome_win,8,1,6,1,"Signin");
-    draw_bottom(welcome_win,signin);
-    struct bottom *exit= creat_bottom(welcome_win,12,1,4,1,"Exit");
-    draw_bottom(welcome_win,exit);
+    struct bottom *login = creat_bottom(welcome_win, 4, 1, 5, 1, "Login");
+    draw_bottom(welcome_win, login);
+    struct bottom *signin = creat_bottom(welcome_win, 8, 1, 6, 1, "Signin");
+    draw_bottom(welcome_win, signin);
+    struct bottom *exit = creat_bottom(welcome_win, 12, 1, 4, 1, "Exit");
+    draw_bottom(welcome_win, exit);
     wrefresh(welcome_win);
-    while(1){
-        int rc=wgetch(welcome_win);
-        if(rc==KEY_MOUSE){
-            if(nc_getmouse(&event)==OK){
+    while (1) {
+        int rc = wgetch(welcome_win);
+        if (rc == KEY_MOUSE) {
+            if (nc_getmouse(&event) == OK) {
                 //mvwprintw(welcome_win, 3, 1, "Mouse at (%d, %d), button %d", event.x-start_x, event.y-start_y, event.bstate);
-                if(click_bottom(event,*login,start_x,start_y)){
-                    free(login);free(signin);free(exit);endwin();
+                if (click_bottom(event, *login, start_x, start_y)) {
+                    free(login);
+                    free(signin);
+                    free(exit);
+                    endwin();
                     return 2;
                 }
-                if(click_bottom(event,*signin,start_x,start_y)){
-                    free(login);free(signin);free(exit);endwin();
+                if (click_bottom(event, *signin, start_x, start_y)) {
+                    free(login);
+                    free(signin);
+                    free(exit);
+                    endwin();
                     return 3;
                 }
-                if(click_bottom(event,*exit,start_x,start_y)){
-                    free(login);free(signin);free(exit);endwin();
+                if (click_bottom(event, *exit, start_x, start_y)) {
+                    free(login);
+                    free(signin);
+                    free(exit);
+                    endwin();
                     return 0;
                 }
             }
@@ -86,7 +96,9 @@ int Welcome_ui() {
     }
 }
 
-void draw_login_window(WINDOW *win,struct bottom *login,struct bottom *signin,struct bottom *user,struct bottom *psword,struct bottom *exit) {
+void
+draw_login_window(WINDOW *win, struct bottom *login, struct bottom *signin, struct bottom *user, struct bottom *psword,
+                  struct bottom *exit) {
     // 清空窗口并绘制边框
     wclear(win);
     box(win, 0, 0);
@@ -100,214 +112,212 @@ void draw_login_window(WINDOW *win,struct bottom *login,struct bottom *signin,st
     // 密码输入框
     mvwprintw(win, 6, 4, "Password:");
     //绘制剩余内容
-    draw_bottom(win,login);
-    draw_bottom(win,signin);
-    draw_bottom(win,exit);
-    draw_bottom(win,user);
-    draw_bottom(win,psword);
+    draw_bottom(win, login);
+    draw_bottom(win, signin);
+    draw_bottom(win, exit);
+    draw_bottom(win, user);
+    draw_bottom(win, psword);
     wrefresh(win); // 刷新窗口
 }
 
-void get_input(WINDOW *win, int y, int x, char *buffer, int max_len,struct bottom *bot,int sx,int sy) {
+void
+draw_signin_window(WINDOW *win, struct bottom *signin, struct bottom *user, struct bottom *psword,
+                  struct bottom *exit) {
+    // 清空窗口并绘制边框
+    wclear(win);
+    box(win, 0, 0);
+
+    // 标题
+    mvwprintw(win, 1, (WIN_WIDTH - 10) / 2, "Signin");
+
+    // 用户名输入框
+    mvwprintw(win, 3, 4, "Username:");
+
+    // 密码输入框
+    mvwprintw(win, 6, 4, "Password:");
+    //绘制剩余内容
+    draw_bottom(win, signin);
+    draw_bottom(win, exit);
+    draw_bottom(win, user);
+    draw_bottom(win, psword);
+    wrefresh(win); // 刷新窗口
+}
+
+void get_input(WINDOW *win, int y, int x, char *buffer, int max_len, struct bottom *bot, int sx, int sy) {
     MEVENT event;
     int ch, pos = 0;
-    char *test=bot->test;
-    while(pos<max_len&&buffer[pos]!='\0')pos++;
+    char *test = bot->test;
+    while (pos < max_len && buffer[pos] != '\0')pos++;
     while (1) {
-        ch= wgetch(win);
+        ch = wgetch(win);
         if (ch == KEY_BACKSPACE || ch == 8) { // 处理退格键
             if (pos > 0) {
                 pos--;
-                buffer[pos]='\0';
-                test[pos+1]='_';
-                draw_bottom(win,bot);
+                buffer[pos] = '\0';
+                test[pos + 1] = '_';
+                draw_bottom(win, bot);
                 wrefresh(win);
             }
         } else if (pos < max_len - 1 && ch >= 32 && ch <= 126) { // 可打印字符
             buffer[pos++] = ch;
-            if(bot->private==0)test[pos]=ch;
-            else test[pos]='*';
-            draw_bottom(win,bot);
+            if (bot->private == 0)test[pos] = ch;
+            else test[pos] = '*';
+            draw_bottom(win, bot);
             wrefresh(win);
-        }
-        else if(ch== KEY_MOUSE){
-            if(nc_getmouse(&event)==OK){
-                if(!click_bottom(event,*bot,sx,sy)){
+        } else if (ch == KEY_MOUSE) {
+            if (nc_getmouse(&event) == OK) {
+                if (!click_bottom(event, *bot, sx, sy)) {
                     return;
                 }
             }
         }
     }
 }
-int Login_ui(){
+
+int Login_ui() {
     MEVENT event;
+    char *errmsg[30];
+    memset(errmsg, 0, 30);
     int start_y = (LINES - WIN_HEIGHT) / 2;
     int start_x = (COLS - WIN_WIDTH) / 2;
     WINDOW *login_win = newwin(WIN_HEIGHT, WIN_WIDTH, start_y, start_x);
-    keypad(login_win,TRUE);
+    keypad(login_win, TRUE);
     char *username[15];      //储存用户名
     memset(username, 0, 15); // 清空缓冲区
     char *password[15];      //储存密码
     memset(password, 0, 15); // 清空缓冲区
-    struct bottom *login= creat_bottom(login_win,10,4,5,1,"Login");
-    struct bottom *signin= creat_bottom(login_win,10,14,5,1,"Signin");
-    struct bottom *exit= creat_bottom(login_win,10,25,5,1,"Exit");
-    struct bottom *users= creat_bottom(login_win,4,4,16,1,"[______________]");
-    struct bottom *psword= creat_bottom(login_win,7,4,16,1,"[______________]");
-    psword->private=1;users->private=0;
-    while(1){
-        draw_login_window(login_win,login,signin,users,psword,exit);
-        int rc=wgetch(login_win);
-        if(rc==KEY_MOUSE){
-            if(nc_getmouse(&event)==OK){
+    struct bottom *login = creat_bottom(login_win, 10, 4, 5, 1, "Login");
+    struct bottom *signin = creat_bottom(login_win, 10, 14, 5, 1, "Signin");
+    struct bottom *exit = creat_bottom(login_win, 10, 25, 5, 1, "Exit");
+    struct bottom *users = creat_bottom(login_win, 4, 4, 16, 1, "[______________]");
+    struct bottom *psword = creat_bottom(login_win, 7, 4, 16, 1, "[______________]");
+    psword->private = 1;
+    users->private = 0;
+    int willdraw = 1;
+    while (1) {
+        if (willdraw)draw_login_window(login_win, login, signin, users, psword, exit);
+        int rc = wgetch(login_win);
+        if (rc == KEY_MOUSE) {
+            if (nc_getmouse(&event) == OK) {
                 //mvwprintw(welcome_win, 3, 1, "Mouse at (%d, %d), button %d", event.x-start_x, event.y-start_y, event.bstate);
-                if(click_bottom(event,*login,start_x,start_y)){
-                    free(login);free(signin);free(exit);free(users);free(psword);endwin();
-                }
-                if(click_bottom(event,*signin,start_x,start_y)){
-                    free(login);free(signin);free(exit);free(users);free(psword);endwin();
-                    return 3;
-                }
-                if(click_bottom(event,*exit,start_x,start_y)){
-                    free(login);free(signin);free(exit);free(users);free(psword);endwin();
-                    return 1;
-                }
-                if(click_bottom(event,*users,start_x,start_y)){
-                    get_input(login_win, 4, 6, username, 15,users,start_x,start_y);
-                    continue;
-                }
-                if(click_bottom(event,*psword,start_x,start_y)){
-                    get_input(login_win, 7, 6, password, 15,psword,start_x,start_y);
-                    continue;
+                if (willdraw)
+                    if (click_bottom(event, *login, start_x, start_y)) {
+                        int recall;
+                        Login(username, password, &recall, errmsg);
+                        if (recall != 0) {
+                            wclear(login_win);
+                            mvwprintw(login_win, 5, 5, "%s", errmsg);
+                            exit->x=5;exit->y=8;
+                            draw_bottom(login_win, exit);
+                            wrefresh(login_win);
+                            willdraw=0;
+                            continue;
+                        }
+                    }
+                if (willdraw)
+                    if (click_bottom(event, *signin, start_x, start_y)) {
+                        free(login);
+                        free(signin);
+                        free(exit);
+                        free(users);
+                        free(psword);
+                        endwin();
+                        return 3;
+                    }
+                if (click_bottom(event, *exit, start_x, start_y)) {
+                    free(login);
+                    free(signin);
+                    free(exit);
+                    free(users);
+                    free(psword);
+                    endwin();
+                    return willdraw==1?1:2;
                 }
+                if (willdraw)
+                    if (click_bottom(event, *users, start_x, start_y)) {
+                        get_input(login_win, 4, 6, username, 15, users, start_x, start_y);
+                        continue;
+                    }
+                if (willdraw)
+                    if (click_bottom(event, *psword, start_x, start_y)) {
+                        get_input(login_win, 7, 6, password, 15, psword, start_x, start_y);
+                        continue;
+                    }
             }
         }
     }
 }
 
-int Signin_ui(){
-
-}
-
-
-
-
-
-
-
-
-//void draw_button(WINDOW *win, int x, int y, const char *label, bool is_active) {
-//    if (is_active) {
-//        wattron(win, A_REVERSE);  // 激活按钮时反显
-//    }
-//    mvwprintw(win, y, x + (BUTTON_WIDTH - strlen(label)) / 2, "%s", label);
-//    if (is_active) {
-//        wattroff(win, A_REVERSE); // 反显结束
-//    }
-//    box(win, 0, 0);  // 画按钮的边框
-//    wrefresh(win);
-//}
-
-//void draw_login_window() {
-//    // 绘制登录窗口
-//    clear();
-//    box(stdscr, 0, 0);
-//
-//    // 标题
-//    mvprintw(2, 20, "Login Window");
-//
-//    // 用户名
-//    mvprintw(USERNAME_Y, USERNAME_X - 10, "Username: ");
-//    mvprintw(PASSWORD_Y, PASSWORD_X - 10, "Password: ");
-//
-//    // 输入框
-//    mvprintw(USERNAME_Y, USERNAME_X, "____________________________");
-//    mvprintw(PASSWORD_Y, PASSWORD_X, "____________________________");
-//
-//    // 按钮
-//    mvprintw(LOGIN_BTN_Y, LOGIN_BTN_X, "[ Login ]");
-//    mvprintw(REGISTER_BTN_Y, REGISTER_BTN_X, "[ Register ]");
-//
-//    refresh();
-//}
-
-//void handle_mouse_click(MEVENT event) {
-//    // 处理鼠标点击事件
-//    if (event.bstate & BUTTON1_CLICKED) {
-//        // 判断是否点击了登录按钮
-//        if (event.x >= LOGIN_BTN_X && event.x <= LOGIN_BTN_X + 9 &&
-//            event.y == LOGIN_BTN_Y) {
-//            printw("\nLogin button clicked!\n");
-//            refresh();
-//        }
-//            // 判断是否点击了注册按钮
-//        else if (event.x >= REGISTER_BTN_X && event.x <= REGISTER_BTN_X + 11 &&
-//                 event.y == REGISTER_BTN_Y) {
-//            printw("\nRegister button clicked!\n");
-//            refresh();
-//        }
-//    }
-//}
-
-void clear_input_area(int x, int y, int len) {
-    // 清除输入框区域
-    for (int i = 0; i < len; i++) {
-        mvaddch(y, x + i, ' ');
+int Signin_ui() {
+    MEVENT event;
+    char *errmsg[100];
+    memset(errmsg, 0, 30);
+    int start_y = (LINES - WIN_HEIGHT) / 2;
+    int start_x = (COLS - WIN_WIDTH) / 2;
+    WINDOW *signin_win = newwin(WIN_HEIGHT, WIN_WIDTH, start_y, start_x);
+    keypad(signin_win, TRUE);
+    char *username[15];      //储存用户名
+    memset(username, 0, 15); // 清空缓冲区
+    char *password[15];      //储存密码
+    memset(password, 0, 15); // 清空缓冲区
+    struct bottom *signin = creat_bottom(signin_win, 10, 4, 5, 1, "Signin");
+    struct bottom *exit = creat_bottom(signin_win, 10, 25, 5, 1, "Exit");
+    struct bottom *users = creat_bottom(signin_win, 4, 4, 16, 1, "[______________]");
+    struct bottom *psword = creat_bottom(signin_win, 7, 4, 16, 1, "[______________]");
+    psword->private = 0;
+    users->private = 0;
+    int willdraw = 1;
+    while (1) {
+        if (willdraw)draw_signin_window(signin_win, signin, users, psword, exit);
+        int rc = wgetch(signin_win);
+        if (rc == KEY_MOUSE) {
+            if (nc_getmouse(&event) == OK) {
+                //mvwprintw(welcome_win, 3, 1, "Mouse at (%d, %d), button %d", event.x-start_x, event.y-start_y, event.bstate);
+                if (willdraw)
+                    if (click_bottom(event, *signin, start_x, start_y)) {
+                        int recall;
+                        Signin(username,password,&recall,errmsg);
+                        if (recall != 0) {
+                            wclear(signin_win);
+                            mvwprintw(signin_win, 5, 5, "%s", errmsg);
+                            exit->x=5;exit->y=8;
+                            draw_bottom(signin_win, exit);
+                            wrefresh(signin_win);
+                            willdraw=0;
+                            continue;
+                        }
+                        else{
+                            wclear(signin_win);
+                            mvwprintw(signin_win, 5, 5, "Accepted");
+                            exit->x=5;exit->y=8;
+                            draw_bottom(signin_win, exit);
+                            wrefresh(signin_win);
+                            willdraw=0;
+                            continue;
+                        }
+                    }
+                if (click_bottom(event, *exit, start_x, start_y)) {
+                    free(signin);
+                    free(exit);
+                    free(users);
+                    free(psword);
+                    endwin();
+                    return willdraw==1?1:3;
+                }
+                if (willdraw)
+                    if (click_bottom(event, *users, start_x, start_y)) {
+                        get_input(signin_win, 4, 6, username, 15, users, start_x, start_y);
+                        continue;
+                    }
+                if (willdraw)
+                    if (click_bottom(event, *psword, start_x, start_y)) {
+                        get_input(signin_win, 7, 6, password, 15, psword, start_x, start_y);
+                        continue;
+                    }
+            }
+        }
     }
 }
 
-//void Login_ui() {
-//    initscr();                // 初始化屏幕
-//    cbreak();                 // 禁用行缓冲
-//    noecho();                 // 不显示输入的字符
-//    keypad(stdscr, TRUE);     // 启用键盘功能（例如箭头键）
-//    mousemask(ALL_MOUSE_EVENTS, NULL); // 启用所有鼠标事件
-//    curs_set(0);              // 隐藏光标
-//
-//    draw_login_window();      // 绘制登录窗口
-//
-//    char username[MAX_INPUT_LEN + 1] = "";
-//    char password[MAX_INPUT_LEN + 1] = "";
-//    int ch;
-//    MEVENT event;
-//
-//    while (1) {
-//        ch = getch();  // 获取输入
-//
-//        if (ch == KEY_MOUSE) {  // 检查是否是鼠标事件
-//            if (nc_getmouse(&event) == OK) {
-//                handle_mouse_click(event);  // 处理鼠标点击事件
-//            }
-//        }
-//
-//        // 处理键盘输入（用户输入用户名和密码）
-//        if (ch == 10) {  // 回车键
-//            printw("\n登录成功！\n");
-//            break;
-//        }
-//
-//        // 如果是在用户名或密码框中输入
-//        if (ch == KEY_BACKSPACE || ch == 127) {  // 退格键
-//            // 删除输入框中的最后一个字符
-//            if (strlen(username) > 0) {
-//                username[strlen(username) - 1] = '\0';
-//                clear_input_area(USERNAME_X, USERNAME_Y, MAX_INPUT_LEN);
-//                mvprintw(USERNAME_Y, USERNAME_X, "%s", username);
-//            }
-//        } else if (isprint(ch)) {  // 只接受可打印的字符
-//            if (strlen(username) < MAX_INPUT_LEN) {
-//                username[strlen(username)] = ch;
-//                username[strlen(username) + 1] = '\0';
-//                mvprintw(USERNAME_Y, USERNAME_X, "%s", username);
-//            }
-//        }
-//
-//        refresh();
-//    }
-//
-//    endwin();  // 结束 ncurses 模式
-//    return;
-//}
-// 用于绘制按钮的函数