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#include <termios.h>
#include <unistd.h>
#include <stdio.h>
#include <iostream>
#include <string>
using namespace std;
int getch() {
int ch;
struct termios t_old, t_new;
tcgetattr(STDIN_FILENO, &t_old);
t_new = t_old;
t_new.c_lflag &= ~(ICANON | ECHO);
tcsetattr(STDIN_FILENO, TCSANOW, &t_new);
ch = getchar();
tcsetattr(STDIN_FILENO, TCSANOW, &t_old);
return ch;
}
string getpass(const char *prompt, bool show_asterisk=true)
{
const char BACKSPACE=127;
const char RETURN=10;
string password;
unsigned char ch=0;
cout <<prompt<<endl;
while((ch=getch())!=RETURN)
{
if(ch==BACKSPACE)
{
if(password.length()!=0)
{
if(show_asterisk)
cout <<"\b \b";
password.resize(password.length()-1);
}
}
else
{
password+=ch;
if(show_asterisk)
cout <<'*';
}
}
cout <<endl;
return password;
}
int main()
{
const char *correct_password="null";
string password=getpass("Please enter the password: ",true); // Show asterisks
if(password==correct_password)
cout <<"Correct password"<<endl;
else
cout <<"Incorrect password. Try again"<<endl;
password=getpass("Please enter the password: ",false); // Do not show asterisks
if(password==correct_password)
cout <<"Correct password"<<endl;
else
cout <<"Incorrect password. Try again"<<endl;
return 0;
}
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根据 Linux 程序员手册，此函数已过时，应尽可能避免使用。
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#include <cstdlib>
#include <iostream>
using namespace std;
const char *mypass="null";
int main()
{
char *password=getpass("Enter password: ");
if(strcmp(password,mypass)==0) cout <<"Correct password!\n";
else cout <<"Incorrect password!\n";
return 0;
}
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#include <iostream>
#include <string>
#include <windows.h>
using namespace std;
string getpass(const char *prompt, bool show_asterisk=true)
{
const char BACKSPACE=8;
const char RETURN=13;
string password;
unsigned char ch=0;
cout <<prompt<<endl;
DWORD con_mode;
DWORD dwRead;
HANDLE hIn=GetStdHandle(STD_INPUT_HANDLE);
GetConsoleMode( hIn, &con_mode );
SetConsoleMode( hIn, con_mode & ~(ENABLE_ECHO_INPUT | ENABLE_LINE_INPUT) );
while(ReadConsoleA( hIn, &ch, 1, &dwRead, NULL) && ch !=RETURN)
{
if(ch==BACKSPACE)
{
if(password.length()!=0)
{
if(show_asterisk)
cout <<"\b \b";
password.resize(password.length()-1);
}
}
else
{
password+=ch;
if(show_asterisk)
cout <<'*';
}
}
cout <<endl;
return password;
}
int main()
{
const char *correct_password="null";
cout <<"Test 1: echoing enabled"<<endl;
string password=getpass("Please enter the password: ",true); // Show asterisks
if(password==correct_password)
cout <<"Correct password"<<endl;
else
cout <<"Incorrect password. Try again"<<endl;
cout <<"\nTest 2: echoing disabled"<<endl;
password=getpass("Please enter the password: ",false); // Do not show asterisks
if(password==correct_password)
cout <<"Correct password"<<endl;
else
cout <<"Incorrect password. Try again"<<endl;
return 0;
}
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此代码与前一个示例类似，但使用了 conio.h 头文件中的 getch() 函数来获取无缓冲的控制台输入。请注意，conio.h 是 Borland 特有的头文件，应尽可能避免使用。
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#include <iostream>
#include <string>
#include <conio.h>
using namespace std;
string getpass(const char *prompt, bool show_asterisk=true)
{
const char BACKSPACE=8;
const char RETURN=13;
string password;
unsigned char ch=0;
cout <<prompt<<endl;
while((ch=getch())!=RETURN)
{
if(ch==BACKSPACE)
{
if(password.length()!=0)
{
if(show_asterisk)
cout <<"\b \b";
password.resize(password.length()-1);
}
}
else if(ch==0 || ch==224) // handle escape sequences
{
getch(); // ignore non printable chars
continue;
}
else
{
password+=ch;
if(show_asterisk)
cout <<'*';
}
}
cout <<endl;
return password;
}
int main()
{
const char *correct_password="null";
string password=getpass("Please enter the password: ",true); // Show asterisks
if(password==correct_password)
cout <<"Correct password"<<endl;
else
cout <<"Incorrect password. Try again"<<endl;
password=getpass("Please enter the password: ",false); // Do not show asterisks
if(password==correct_password)
cout <<"Correct password"<<endl;
else
cout <<"Incorrect password. Try again"<<endl;
return 0;
}
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请注意，如果密码长度超过控制台宽度（80 个字符），退格键将无法删除上一行中的星号。
Curses 库是跨平台控制台操作的最佳选择之一。请记住，该库是为 C 编程语言设计的，因此您无法将其与 C++ iostream 一起使用。
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#include <string>
#include <curses.h>
using namespace std;
string getpass(const char *prompt)
{
printw(prompt);
noecho(); // disable character echoing
char buff[64];
getnstr(buff,sizeof(buff));
echo(); // enable character echoing again
return buff;
}
int main()
{
const string correct_password="null";
initscr(); // enable ncurses
string pwd=getpass("Please enter the password: ");
if(correct_password==pwd)
printw("\nCorrect password!");
else
printw("\nIncorrect password. Try again");
getch(); // Wait for a keypress
endwin(); // disable ncurses
return 0;
}
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#include <string>
#include <curses.h>
using namespace std;
string getpass(const char *prompt, bool show_asterisk=true)
{
const char BACKSPACE=8;
const char RETURN=10; // Note: 10 for curses, 13 for conio
string password;
unsigned char ch=0;
printw(prompt);
printw("\n");
noecho(); // Disable echoing
while((ch=getch())!=RETURN)
{
if(ch==BACKSPACE)
{
if(password.length()!=0)
{
if(show_asterisk)
printw("\b \b");
password.resize(password.length()-1);
}
}
else if(ch!=27) // ignore 'escape' key
{
password+=ch;
if(show_asterisk)
printw("*");
}
}
echo();
printw("\n");
return password;
}
int main()
{
initscr();
const char *correct_password="null";
printw("Test 1: echoing enabled\n");
string password=getpass("Please enter the password: ",true); // Show asterisks
if(password==correct_password)
printw("Correct password!\n");
else
printw("Incorrect password. Try again\n");
printw("\nTest 2: echoing disabled\n");
password=getpass("Please enter the password: ",false); // Do not show asterisks
if(password==correct_password)
printw("Correct password");
else
printw("Incorrect password. Try again");
printw("\n\nPress any key to continue...");
getch();
endwin();
return 0;
}
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1.
在此处下载 curses：
http://sourceforge.net/projects/pdcurses/files/ 2. 您必须将您的项目与
pdcurses.lib 库链接。
