C/C++：命令行输入不回显

C/C++：命令行输入不回显

#include <iostream>
#include <conio.h>

/**
 * 秘密在于conio.h中的getch()从键盘中读取字符时,并不会在屏幕上输出已经输入的字符,
 * 而用一个putch('*')来哄骗,代表已经输入一个字符
 * 怪不得这个头文件要叫conio.h, con的意思就有哄骗,看来就是由此而来.
 */

using namespace std;

int main() {
        char* password;
        char* passwordConfirm;

        int length = 4;
        password = new char[length + 1];
        passwordConfirm = new char[length + 1];

        char* p = NULL;
        int count = 0;

        cout << "Input password : ";
        p = password;
        count = 0;
        //fflush(stdin);
        while (((*p = getch()) != 13) && count < length) {
                 // 这里不是'\n'(10), new line
                // 而是'\r'(13), reback. 即是按下回车键,好像这个东西是linux的.
                // 主要是与getch这个函数有关.
                putch('*');
                fflush(stdin);

                p++;
                count++;
        }
        password[count] = '\0';

        cout << endl << "Confirm the password : ";
        p = passwordConfirm;
        count = 0;
        //fflush(stdin);
        while (((*p = getch()) != 13) && count < length) {
                putch('*');
                fflush(stdin);

                p++;
                count++;
        }
        passwordConfirm[count] = '\0';

        cout << endl;
        if (strcmp(password, passwordConfirm) == 0) {
                cout << "The password is right." << endl;
                cout << password << endl;
        } else {
                cout << "Confirm password fail." << endl;
                cout << password << endl << passwordConfirm << endl;
        }

        return 0;
}